Added maven to version mgmt

src/hadoop_analysis/java_version_manager.py

-import subprocess
 import os
-
+import subprocess
 
 def list_java_versions():
     """Lists all available Java versions."""
     try:
         output = subprocess.check_output(
-            ["update-java-alternatives", "--list"], text=True
+            ["update-alternatives", "--list", "java"], text=True
         )
         print(output)
     except subprocess.CalledProcessError as e:
@@ -15,47 +14,58 @@ def list_java_versions():
 
 def switch_java_version(java_version):
     """
-    Switches the Java version using update-java-alternatives and sets JAVA_HOME appropriately.
+    Switches the Java version using update-java-alternatives, sets JAVA_HOME, and configures Maven appropriately.
 
     Args:
         java_version (str): The name of the Java version to switch to, as listed by 'update-java-alternatives --list'.
     """
+    version_map = {
+        "1.6": "jdk1.6.0_45",
+        "1.7": "java-se-7u75-ri",
+        "1.8": "temurin-8-jdk-amd64",
+        "11": "temurin-11-jdk-amd64",
+        "21": "temurin-21-jdk-amd64"
+    }
 
-    if java_version == "21":
-        target_version = "temurin-21-jdk-amd64"
-    elif java_version == "1.8":
-        target_version = "temurin-8-jdk-amd64"
-    elif java_version == "11":
-        target_version = "temurin-11-jdk-amd64"
-    else:
+    maven_map = {
+        "1.6": "/opt/maven/apache-maven-3.0.5",
+        "1.7": "/opt/maven/apache-maven-3.6.3",
+        "1.8": "/opt/maven/apache-maven-3.6.3",
+        "11": "/opt/maven/apache-maven-3.6.3",
+        "21": "/opt/maven/apache-maven-3.6.3"
+    }
+    
+    target_version = version_map.get(java_version)
+    if not target_version:
+        print(f"Invalid Java version specified: {java_version}")
         return
     
     try:
         # Switch the Java version
         subprocess.run(
-            ["update-java-alternatives", "-s", target_version], check=True
+            ["update-alternatives", "--set", "java", f"/usr/lib/jvm/{target_version}/bin/java"], check=True
         )
         print(f"Switched to Java version: {target_version}")
 
-        # Get the JAVA_HOME for the selected Java version
-        result = subprocess.run(
-            ["update-alternatives", "--query", "java"],
-            capture_output=True,
-            text=True,
-            check=True,
-        )
-
-        # Extract the JAVA_HOME path
-        lines = result.stdout.split("\n")
-        for line in lines:
-            if "Value: " in line:
-                java_path = line.split("Value: ")[1].strip()
-                java_home = os.path.dirname(os.path.dirname(java_path))
-                os.environ["JAVA_HOME"] = (
-                    java_home  # Set JAVA_HOME in the current environment
-                )
+        # Set JAVA_HOME in the current environment and export it for all users
+        java_home = f"/usr/lib/jvm/{target_version}"
+        os.environ["JAVA_HOME"] = java_home  # Set JAVA_HOME in the current environment
         print(f"Set JAVA_HOME to {java_home}")
-                break
+
+        # Export JAVA_HOME for all shell sessions
+        with open('/etc/profile', 'a') as file:
+            file.write(f'\nexport JAVA_HOME={java_home}\n')
+
+        # Configure Maven
+        maven_home = maven_map.get(java_version)
+        os.environ["M2_HOME"] = maven_home
+        os.environ["PATH"] = f"{maven_home}/bin:" + os.environ.get("PATH", "")
+        print(f"Set M2_HOME to {maven_home}")
+
+        # Export M2_HOME for all shell sessions
+        with open('/etc/profile', 'a') as file:
+            file.write(f'\nexport M2_HOME={maven_home}\n')
+            file.write(f'\nexport PATH={maven_home}/bin:$PATH\n')
 
     except subprocess.CalledProcessError as e:
         print(f"Failed to switch Java version to {target_version}: {e}")
\ No newline at end of file