Fix Java version package error

Dockerfile

@@ -1,30 +1,32 @@
+# Use specific bookworm tag to ensure stability, or stick to slim
+# We will use the generic slim but fix the Java install
 FROM python:3.11-slim
 
 WORKDIR /app
 
-# 1. Install System Dependencies (Java for LanguageTool, Build tools for safety)
+# 1. Install System Dependencies
+# Changed 'openjdk-17-jdk-headless' to 'default-jdk-headless'
+# This automatically picks the correct available Java version (likely 21)
 RUN apt-get update && \
-    apt-get install -y openjdk-17-jdk-headless build-essential git && \
+    apt-get install -y default-jdk-headless build-essential git && \
     rm -rf /var/lib/apt/lists/*
 
 # 2. Copy files
 COPY . .
 
 # 3. Install Python libraries
-# We add --verbose to see errors if pip fails
+# --upgrade pip first to avoid wheel build issues
 RUN pip install --no-cache-dir --upgrade pip && \
     pip install --no-cache-dir -r requirements.txt
 
-# 4. Create User (Robust Version)
-# Checks if user exists; if not, creates it. Handles existing ID 1000.
+# 4. Create User (Robust Check)
 RUN id -u user &>/dev/null || useradd -m -u 1000 user
 
 # 5. Fix Permissions
-# Ensure the new user owns the app directory and home directory
 RUN chown -R user:user /app && \
     chown -R user:user /home/user
 
-# 6. Switch to User
+# 6. Switch User
 USER user
 ENV HOME=/home/user \
     PATH=/home/user/.local/bin:$PATH