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Hello, distance in Prius lesson, we have learned what modules are in decay?

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We also created our first modular application.

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In case you skipped the previous lesson, please make sure you watched it because in this lesson, we'll

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keep talking about modules.

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But this time will not create our module application from scratch.

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But instead, we'll focus our attention on the questions of migration of Nano Modular Java application

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to modular Java application.

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Also, this lesson will be interesting for architects who are in charge of Java migration and responsible

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for making decisions and planning next migration steps.

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You need to be aware about issues and solutions that we are going to discuss in this lesson.

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This is a super important topic, especially if your organization made a decision to migrate from Java

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eight to NAS, a long term support version like Java Plans that includes support of modules.

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And also, this is super important in case you decide to pass Oracle Java certifications, because some

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of the Oracle certifications include questions about migration to modular application, including top

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down and bottom up migration, and Split Ajala Agile Associates application into modules for migration.

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We'll start our lesson from learning and understanding of general algorithm for migration of our court

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to the new environment, including migration to the new version of Dedicate.

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Special focus today will be the migration of application to modular architecture.

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I will explain in one Java Class Dependency Analyzer tool is and what Java deprecated API is.

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Current tool is also we're going to learn today.

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Different migration strategies will review Bottom-Up and top-down migration strategies that start our

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lesson.

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And before I start diving in details, let's come up with steps and migration algorithm first, the

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step number zero and super important one.

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If you great internet, not sure that you would find this advice anywhere, but exactly as you said,

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was help make them a great deal.

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Worse software products two different versions and environments before any movements were scored that

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potentially may impact the way our program works, no matter whether this is refactoring or migrating

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and in what may impact or change code and the way how it is executed.

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Make sure that you have for libel suit of tests on different levels.

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The general recommendation here would be to automate as much as possible.

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Some of my clients say to me that this automation is a huge investments and they have dedicated manual

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regression time and cost wise, easy to understand the point you were talking about short periods of

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time and a not complex project.

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But I also saw projects where regression takes months.

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Nowadays, probably it is crazy.

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Amount of times it will add this software product to survive in the current environment, where your

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competitors are releasing new features each week or two weeks and your product only has regression for

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one months.

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Definitely.

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Is there a different areas and domains?

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Some of them more competitive?

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Some of them less.

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But I am sure you understood my point.

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So when my clients send me about not having enough resources on the creation of automation test and

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framework that includes small tests, use regression tests, etc., I'm asking a simple question.

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I am sure that in this case, you have enough resources and needs to halt any migrations.

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Probably it is better to put resources into product development, marketing to the market, find investments

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and come to the point where we have enough resources to scale and grow because otherwise we are not

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doing any migration just to do migration.

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We need to identify purposes of the migration and be sure that our migration brings some value and it

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is needed.

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And if it is needed, we're happy to accept all imports and provide everything what is necessary to

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make this happen.

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Here's where the first principle comes from.

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We need to identify goals of our migration and measures to stay specific and objective.

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What we are trying to achieve by performance, better security, better code design in order to be able

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to scale application faster.

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This is super important and once goal is defined.

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Make measurements of the current system.

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You need to have something and other.

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You can say communication has been successful.

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Often, migration trends are the goals were achieved because at the end of the day, we never the a

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factor on migration just for fun.

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We do it to get advantage of measurable benefits.

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Never forget about this.

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Let's agree it's within the scope of this particular demo will hold migration to another long term support

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Java release in order to achieve better structure in order to simplify introducing of new features,

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improving court architecture to make each release predictable and reduce impact of introducing new changes

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on already released codes.

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Improved security.

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We are achieving better encapsulation of components, greater platform integrity, improved performance.

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These are goals of Java platform Model S system and in case you missed the previous lesson.

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Please watch it because we discussed goals and benefits of modules in detail in previous lesson, and

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we agreed to migrate our app to the modular architecture.

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Let's review the following steps for this.

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The next thing that we need to do is to download the updated JDK version Java Platform Modular System

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finally was introduced in Java version nine.

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But as we discussed in the first lesson about JDK, I would recommend you to use long term support Java

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versions.

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Nowadays, we have two long term support versions.

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They are eight and 11 considering that we want to migrate our app to have modular application.

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Most likely, we would opt for Java version 11.

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But you also can opt for Java version nine if you wish.

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Wrong application was near adjudicate.

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This is also important step.

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Java ensures backwards compatibility, but still, there might be some changes.

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For example, if you used some options for garbage collector, pay attention that, for example, indicate,

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well, some of them removed.

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That's why, even despite Java guarantees backwards compatibility, it is never redundant to compile

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and run your app with new adjudication.

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Also, this might be important to ensure compatibility was a by your libraries.

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So the main goal is to run your app on the use adjudicate mission and to deal with this task.

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You need to be aware about new features in Japanese that you want to use for immigration.

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This can be easily found on the official websites.

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The first step would be to update third party dependencies if needed.

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So we need to make sure that your app was all external dependencies may be compiled, built and started

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successfully Ranji DApps against your project.

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Enthusiasm for familiar with J.

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DApps and don't know what it is.

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Let me quickly explain.

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Basically, this is a tool that is present in JDK to identify dependencies between classes, modules,

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packages in your app.

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It is a common line to runs a Java Class Dependency Analyzer tool.

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It processes Java bytecode, meaning the class files all the jars that contains them and analyzes the

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statically declared dependencies between the classes.

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The results can be filtered in various ways and can be aggregated to package or jar level.

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Knapp's is also fully aware of the module system.

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This is super important and useful for you to understand before you plan and immigration, and before

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you make any final decision about your modules and packages structured a little bit later.

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In this lesson, I am going to show you how to work with Jade DApps program Ramji that are scrum against

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your project.

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If you're not familiar with this, though, let me quickly explain what it is.

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This tool is a static analysis tools its concept jar file or some other aggregation of class files for

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usages of deprecated API elements.

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When you upgrade to the new version, you might be interested in this information to to update your

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code accordingly.

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Do not accumulate dependencies on deprecated classes and masses a little bit later today on the real

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example, I'm going to show you how to apply this to now.

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After all these steps, we're safe to proceed with the next steps on this stage.

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Having all necessary input information, we are ready to make a decision and plan the duration we need

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to select the migration strategy.

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Today, we'll discuss a few of them.

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Once you select migration strategy and plan migration steps, we're going to proceed with migration

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execution.

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Usually, Oracle and community release migration guides for each new version that contains important

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information that you need to consider during the migration of your app.

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One of such goods, I will leave in attachments to the lesson.

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But you can easily find similar guides for other versions, and each migration should be followed by

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regression testing.

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We already discussed that even before starting doing steps like this, we need to make sure that we

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have reliable sort of tests that will allow us to confirm that at least nothing is broken and migration

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goals are achieved.

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After that, we are ready to proceed with a step where you can apply measurements that you did before

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migration to verify region of migration goals.

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For example, if the goal was to improve performance, measure performance of your app after migration

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and if performance become even worse.

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The question is was immigration was successful?

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I don't think so.

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That means is that some steps still need to be done and planned.

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This migration should be adjusted to include additional steps to reach the goal of migration.

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Does it make sense?

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So now, like the reviews it, I'll Google one more time.

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Press pause if needed.

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And once you are sure about each step and the sequence of actions we are glad to proceed is a step number

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zero.

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I have separate course for that.

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You can check my course got and test during development.

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I elaborated a lot on this topic.

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Step number one is up to you and your organization.

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You should identify goals of migration internally, and I wouldn't be able to help you with that.

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Do not forget to perform any measurements.

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How long was a goal to compare these before immigration and after migration?

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Regarding the loading of the latest duplicate version, I believe if you already watching this lesson,

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you are smart and mature enough to download Oracle JDK or open JDK.

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After that, you need to run your project with new JDK.

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I'm sure you will be able to those that want the same as updates and third party dependencies too,

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and with the next step, probably let me help you with that one.

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Let me explain to you more about the app's program, how to use it and show this on live demo.

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So as we have discussed, GDP is a Java dependency analysis tool, probably the first questions that

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students ask me is where they can get the depth and the words they should download.

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I want to say that you don't need to worry about that if you have dedicated, download it on your PC.

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This program is already is.

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They're waiting for you in bin folder since Java version eight will work with this tool directly from

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Command Prompt.

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So make sure that you JDK pass configure it properly and that Jane Daps Version Command returns your

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result in command line.

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Let me show you a quick them in order you could understand how to work with this still.

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This told me on the last group of classes.

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Let me show you two examples now in the first example, I will show you how to analyze old fashioned

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clean Java project as a simple project we are going to use.

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My Java project was examples, the ones that are used to demonstrate different topics to students of

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mine.

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And then the second example will analyze more single modular project that doesn't have too much dependencies

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between different packages and modules in case you have a general project.

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The first thing that you need to do is to aggregate all components resources in one folder miserably

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Jr. Archive in separate lessons were learned such build tools and maven granule, et cetera, that those

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in charge of building your project, creating some deployable pieces like jars or walls, and now a

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specific case would need to generate just by our cells in the clips.

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I can easily do this by mouse, right click on the project, find them experts option and select the

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jar.

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File some options here.

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Now we need to specify jar pots and place where archive will be located and generated zen numerous of

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other options.

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Majority of them are so describing I want a stop on those.

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But even in case you have some questions, let me know in comments below this video and I will be happy

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to answer.

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Now one, we have jar file.

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We are ready to analyze it.

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I open it bush terminal in this folder and now executes my script in this directory.

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Commands that I'm going to execute is stored in a common dirt file.

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I store the script on the Zagat index so that you could investigate it later.

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Let me open this script and I will explain what is the reason here.

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This is actually to invoke Java dependency analysis.

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That output is a command line option to specify a destination directory for the file output, not file

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content is simple tags that can be copied and pasted into the online editor, for example, or other

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editors to generate graphs that visualizes dependencies will generate one in the middle.

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You can see that they use Dot after dot output option.

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If you are familiar with this character, then you already know that Daughtery first is a current directory.

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So this means is a dirt file will be generated in the current directory, whereas this command will

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be executed.

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The next option is recursive.

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This option recursive the traverses or runtime dependencies plus force option specifies directory was

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ClassPass, including external dependencies in our particular cases, with few external dependencies

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on different lessons.

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And I don't know that these jurors into my downloads folder.

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That's why I also included those here, and the last program argument is just to analyze.

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Basically, that is the ones that we built.

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It contains all classes from all packages of my training project that's executed the script.

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I wrote the name of the script to console and press enter.

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It takes some time to analyze dependencies, but finally, not file is generated in the current directory.

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Let's open it, and you can see that the content of this file is just text.

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It contains some specific structure.

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You can see dependency of each package on another package, probably when you have session load of packages.

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It is even better to use this text representation to analyze this data and think about structuring new

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modules.

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But still, if you want to visualize it, let's use special tools for that.

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We can find online tools to visualize our dependencies.

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For example, we can use just one of those I'm talking about.

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Map Graph is just Scorpion's based content of the file based here and press generate graphs button.

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That was easy, but you can see how much gross dependencies we are.

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Definitely.

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There is a lot of work here, considering this is a project and a lot of different topics.

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Some of them very often reuses some common glosses or packages, and that's why we have something like

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this.

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You can spend time after the lesson and used to get this.

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I added these files in to get this.

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So you will be able to find those in the directory of the project.

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Most likely, if you would, any great all project that doesn't have more destruction, you would see

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something like this.

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Or even worse.

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Well, most likely you will see worse.

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Sorry, but this is true.

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OK, let's move on, and now I'd like to show you how to work with this, though, if you would like

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to analyze modular application.

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And you remember, is it a previous lesson of the creative modular application?

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Let's analyze dependencies for that app.

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The idea is similar, but instead of Java, you can pass a reference to the director with your modules

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so you already can make a conclusion.

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ZG Depths Program has separate group of command line options for modular and non modular applications.

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These are common ones that they want to execute is also stored in shell script.

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Let me open the file and we'll discuss what is written here.

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Also to execute shell script in the other directory, I open terminal.

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As you can see, I use Module First Command Line option and pauses a reference to the directory where

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all my module is located.

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Another option is that modules to add modules to zero set for analysis.

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I use custom to add all modules in the directory as the last option here is the list is pretty familiar

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to you.

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This is for the output.

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Let's execute this script in the terminal and we have generated summary file.

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Let's copy content from here and let me paste this content on the website to generate the graph.

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As you can see, code I think moves at depends on coal.

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I think moves greetings module and Moses and the pass on Java based module.

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Is it clear for you?

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Press a pause for a minute and sync one more time about this live demo.

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Thank you.

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Samsung is still not clear for you.

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Please do not hesitate to pose your question below this video, and I will be happy to answer.

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On the screen, you can find common long options that you may use with great depths on the slide, you

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can find possible options.

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Module dependency analysis options.

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Options to filter dependencies.

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Options to filter closest to be analyzed.

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And as you can see, there are a lot of them.

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Probably it doesn't make any sense to me holding them off each option.

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I believe you understood the main principle, and so I would demo was few options.

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You can just play with other options if you want.

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Feel free to pause the Ouija if you want to read all comments on the slide.

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OK, let's proceed.

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The next thing that I am going to demo you is depressed, can't program, you have a deprecated API

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kind of tool is a common line tool to scan for users.

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So deprecated API elements of given Java class files.

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Input glosses can be given as a bosnich to a class file and directory or jar file, the same as G Deps

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G Deeper Scan also has been included in genica installation since adjudicate.

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That means you can find that in bin folder of Dedicate.

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And if you configure Java POS properly, you can access it from command line.

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I'm going to show you example, Wisconsin, of my learning project, I put Judy Proskauer in Shell script.

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The simplest way how to use this command is to invoke it and pass journal names that we would like to

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scan.

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I want to execute this script and get the bus.

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And again, it takes some time because Project has a lot of files and it is done on the top.

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You can see notifications in which classes are used.

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Deprecated masses Knowing this information, you can just check deprecated masses, usually in documentation

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is deprecated mass that it is specified which other mass that you should use instead.

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That is simple.

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I agree.

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And this command also has few important command line options.

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Definitely Zionism's MS engine.

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That program has but still something for you, at least to be aware of response if you want to explore

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all these in details.

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And if you're OK, I will continue.

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Now, let's review immigration strategies.

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We will cover case when a regional application is based on gender versions that is less than juvenile

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or it is Java nine or higher, but the modular approach wasn't originally implemented since the use

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of this mechanism is fully optional.

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M. relearned tools and went through the step where we did the line, which modules draft files are present

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in application and what dependencies exist between them.

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Also, another way to do that besides such automated tools of static code analysis as DApps is through

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an Iraqi eagle diagram, whereas these dependencies are represented in their way.

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This will help give an overview of the components of the application and of each of them, and in which

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orders it can be migrated.

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Identifying those who will not be able to adopt temporally or definitively.

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The later case can be given, for example, insert various libraries that have stopped offering support,

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and that will hardly become modules.

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There are two different migration mechanisms that responds to different initial situations.

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To illustrate the process in each of them, let's imagine the next scenario we plan to migrate an application

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that consists of three jars representing the different layers of the application.

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They are application services and utilize the diagrams that you can see on the screen.

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Now shows the dependencies between these lists.

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Where application depends on services and the tiers and services depends on the utils only.

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Let's review Bottom-Up migration first.

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In this strategy, initially, all jar files that are part of the application will be located at its

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ClassPass.

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All of them can be migrated one by one.

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Does the module POS?

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To do this, we need to follow describes steps.

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The first thing that we need to do is to choose a project package or layer was the lowest position in

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dependencies.

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Iraqi yet has not yet been migrated to module.

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That means to select the project that has less dependencies.

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In our case, this is your deals there.

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After that and the module info Java file to the project, it will be needed to.

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Ads are quite explicit statements to make current module packages available to Iraqi Higher Level Modules

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Moves Integrated Project as a named module from application's class bus to its module bus ensure that

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all not yet migrated.

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The modules remain as unnamed modules in application's class bus.

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What is unnamed modules were discussed in previous lesson.

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One of the learned modules types please refer to the previous lesson through use that, if needed after

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we did all this is this seems it remains to do is to repeat this process was the next lowest level packages

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list of projects in the Iraqi.

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That is not migrated yet, and we are progressing in the bottom direction.

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Can you understand now why this strategy is called bottom up when this approach works the best and when

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we need to apply?

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The bottom up migration strategy was the best one.

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We have the ability to modify any jar that has not yet been converted to module.

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It makes easier as a migration of the project's packages was a whole layers that are at the top of the

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dependency diagram and encourages care in what is exposed to other modules.

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The modules of the lower levels of the Iraqi will be found in the module costs without access to the

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packages of unnamed modules.

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While these unnamed modules that have not been migrated and allocated in the class, ClassPass will

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be able to access zip packages located in both class and module bus.

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Does it make sense so far?

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And now is immigration strategy would be top down in this strategy, initially, all jar files that

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are part of the application will be located at its model bus, so all non-immigrant its projects are

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treated as automatic modules.

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Greatest lesson I current or what automatic modules are.

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So please make sure you watch the previous lesson about modules.

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If you forget, this is example when I didn't use modular approach since it is optional in this case,

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it is recommended to frozen next steps.

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The first thing to do is to choose a high level project and the dependencies Iraqi that has not yet

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been integrated the module.

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After that, we need to add some module info gel file to the project to transform it from an automatic

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module to a named module.

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Also, we shouldn't forget to add necessary expert statements to make current module packages available

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to other modules and the necessary require statements that makes available OSM modules expose packages

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to the current one in case of the reference to a module not yet migrated.

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It should be done through its automatic module name.

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Once these have been migrated, these references should be changed to Z definitive module names.

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Repeat this process was the next high level component.

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Is Iraqi citizens not migrated yet?

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Then the stunt in which case is top down strategy needs to be applied and robust at best.

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This strategy is the best when you don't have the possibility of one day on the horizon.

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All the dependencies of the application was a temporarily or definitively.

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Also, the lower dependencies of the application have not yet been modularized.

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The application itself can be converted into morning.

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Named modules that have already been integrated will be found in the module.

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Boss was access to the entire code contained in the automatic modules that are also found in module

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path.

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Is that clear?

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And remember another important sync?

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In all cases, we have to avoid circle of dependencies between modules.

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That's all what I wanted to share with you in this lesson.

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Let's recap what we have learned today.

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After this lesson, you know, general algorithm to follow during the platform, migration to the new

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environment or in US adjudicate version in particular.

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I showed you how to use in practice Java Class Dependency Analyzer to also we used how to use Java deprecated

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API second to review of different migration strategies, namely, we bottom up and top down migration

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strategies.

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I hope you'll love this lesson and learned a lot of new useful sinks.

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Thanks a lot for your attention.

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Have a great day and see you in the next lesson.