How to downgrade Java version default installed into Azure Portal from Java 17 to Java 11

Question

Java Maven compatibility issues. Java version 17 and Maven version 3.6 is the default versions in my Azure CLI.
Steps to replicate

1. Login to azure portal
2. Click on the Azure CLI icon
3. Azure CLI poweshell terminal opens up
4. Type mvn -X
5. Following error is displayed.
6. After much googling, my understanding is that Maven 3.6 works with Java 11 but has issues with Java 17. Currently , if change Azure CLI to bash terminal and type env, it shows JAVA_HOME as JAVA_HOME=/usr/lib/jvm/msopenjdk-17-amd64. How can I change it to Java 11?

Error:

PS /home/jaya> mvn -X
Apache Maven 3.6.0
Maven home: /usr/share/maven
Java version: 17.0.2, vendor: Microsoft, runtime: /usr/lib/jvm/msopenjdk-17-amd64
Default locale: en_US, platform encoding: UTF-8
OS name: "linux", version: "5.4.0-1078-azure", arch: "amd64", family: "unix"
[ERROR] Error executing Maven.
com.google.common.util.concurrent.UncheckedExecutionException: java.lang.IllegalStateException: Unable to load cache item
at com.google.common.cache.LocalCache$Segment.get (LocalCache.java:2205)
at com.google.common.cache.LocalCache.get (LocalCache.java:3951)
at com.google.common.cache.LocalCache.getOrLoad (LocalCache.java:3955)
at com.google.common.cache.LocalCache$LocalLoadingCache.get (LocalCache.java:4870)
at com.google.common.cache.LocalCache$LocalLoadingCache.getUnchecked (LocalCache.java:4876)
at com.google.inject.internal.FailableCache.get (FailableCache.java:51)
at com.google.inject.internal.ConstructorInjectorStore.get (ConstructorInjectorStore.java:48)
at com.google.inject.internal.ConstructorBindingImpl.initialize (ConstructorBindingImpl.java:155)
at com.google.inject.internal.InjectorImpl.initializeBinding (InjectorImpl.java:581)
at com.google.inject.internal.AbstractBindingProcessor$Processor$1.run (AbstractBindingProcessor.java:176)
at com.google.inject.internal.ProcessedBindingData.initializeBindings (ProcessedBindingData.java:49)
at com.google.inject.internal.InternalInjectorCreator.initializeStatically (InternalInjectorCreator.java:122)
at com.google.inject.internal.InternalInjectorCreator.build (InternalInjectorCreator.java:106)
at com.google.inject.Guice.createInjector (Guice.java:87)
at com.google.inject.Guice.createInjector (Guice.java:69)
at com.google.inject.Guice.createInjector (Guice.java:59)
at org.codehaus.plexus.DefaultPlexusContainer.addPlexusInjector (DefaultPlexusContainer.java:481)
at org.codehaus.plexus.DefaultPlexusContainer.<init> (DefaultPlexusContainer.java:206)
at org.apache.maven.cli.MavenCli.container (MavenCli.java:635)
at org.apache.maven.cli.MavenCli.doMain (MavenCli.java:281)
at org.apache.maven.cli.MavenCli.main (MavenCli.java:192)
at jdk.internal.reflect.NativeMethodAccessorImpl.invoke0 (Native Method)
at jdk.internal.reflect.NativeMethodAccessorImpl.invoke (NativeMethodAccessorImpl.java:77)
at jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke (DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke (Method.java:568)
at org.codehaus.plexus.classworlds.launcher.Launcher.launchEnhanced (Launcher.java:282)
at org.codehaus.plexus.classworlds.launcher.Launcher.launch (Launcher.java:225)
at org.codehaus.plexus.classworlds.launcher.Launcher.mainWithExitCode (Launcher.java:406)
at org.codehaus.plexus.classworlds.launcher.Launcher.main (Launcher.java:347)
Caused by: java.lang.IllegalStateException: Unable to load cache item
at com.google.inject.internal.cglib.core.internal.$LoadingCache.createEntry (LoadingCache.java:79)
at com.google.inject.internal.cglib.core.internal.$LoadingCache.get (LoadingCache.java:34)
at com.google.inject.internal.cglib.core.$AbstractClassGenerator$ClassLoaderData.get (AbstractClassGenerator.java:119)
at com.google.inject.internal.cglib.core.$AbstractClassGenerator.create (AbstractClassGenerator.java:294)
at com.google.inject.internal.cglib.reflect.$FastClass$Generator.create (FastClass.java:65)
at com.google.inject.internal.BytecodeGen.newFastClassForMember (BytecodeGen.java:258)
at com.google.inject.internal.BytecodeGen.newFastClassForMember (BytecodeGen.java:207)
at com.google.inject.internal.DefaultConstructionProxyFactory.create (DefaultConstructionProxyFactory.java:49)
at com.google.inject.internal.ProxyFactory.create (ProxyFactory.java:156)
at com.google.inject.internal.ConstructorInjectorStore.createConstructor (ConstructorInjectorStore.java:92)
at com.google.inject.internal.ConstructorInjectorStore.access$000 (ConstructorInjectorStore.java:29)
at com.google.inject.internal.ConstructorInjectorStore$1.create (ConstructorInjectorStore.java:37)
at com.google.inject.internal.ConstructorInjectorStore$1.create (ConstructorInjectorStore.java:33)
at com.google.inject.internal.FailableCache$1.load (FailableCache.java:40)
at com.google.common.cache.LocalCache$LoadingValueReference.loadFuture (LocalCache.java:3540)
at com.google.common.cache.LocalCache$Segment.loadSync (LocalCache.java:2321)
at com.google.common.cache.LocalCache$Segment.lockedGetOrLoad (LocalCache.java:2284)
at com.google.common.cache.LocalCache$Segment.get (LocalCache.java:2199)
at com.google.common.cache.LocalCache.get (LocalCache.java:3951)
at com.google.common.cache.LocalCache.getOrLoad (LocalCache.java:3955)
at com.google.common.cache.LocalCache$LocalLoadingCache.get (LocalCache.java:4870)
at com.google.common.cache.LocalCache$LocalLoadingCache.getUnchecked (LocalCache.java:4876)
at com.google.inject.internal.FailableCache.get (FailableCache.java:51)
at com.google.inject.internal.ConstructorInjectorStore.get (ConstructorInjectorStore.java:48)
at com.google.inject.internal.ConstructorBindingImpl.initialize (ConstructorBindingImpl.java:155)
at com.google.inject.internal.InjectorImpl.initializeBinding (InjectorImpl.java:581)
at com.google.inject.internal.AbstractBindingProcessor$Processor$1.run (AbstractBindingProcessor.java:176)
at com.google.inject.internal.ProcessedBindingData.initializeBindings (ProcessedBindingData.java:49)
at com.google.inject.internal.InternalInjectorCreator.initializeStatically (InternalInjectorCreator.java:122)
at com.google.inject.internal.InternalInjectorCreator.build (InternalInjectorCreator.java:106)
at com.google.inject.Guice.createInjector (Guice.java:87)
at com.google.inject.Guice.createInjector (Guice.java:69)
at com.google.inject.Guice.createInjector (Guice.java:59)
at org.codehaus.plexus.DefaultPlexusContainer.addPlexusInjector (DefaultPlexusContainer.java:481)
at org.codehaus.plexus.DefaultPlexusContainer.<init> (DefaultPlexusContainer.java:206)
at org.apache.maven.cli.MavenCli.container (MavenCli.java:635)
at org.apache.maven.cli.MavenCli.doMain (MavenCli.java:281)
at org.apache.maven.cli.MavenCli.main (MavenCli.java:192)
at jdk.internal.reflect.NativeMethodAccessorImpl.invoke0 (Native Method)
at jdk.internal.reflect.NativeMethodAccessorImpl.invoke (NativeMethodAccessorImpl.java:77)
at jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke (DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke (Method.java:568)
at org.codehaus.plexus.classworlds.launcher.Launcher.launchEnhanced (Launcher.java:282)
at org.codehaus.plexus.classworlds.launcher.Launcher.launch (Launcher.java:225)
at org.codehaus.plexus.classworlds.launcher.Launcher.mainWithExitCode (Launcher.java:406)
at org.codehaus.plexus.classworlds.launcher.Launcher.main (Launcher.java:347)
Caused by: java.lang.NoClassDefFoundError: Could not initialize class com.google.inject.internal.cglib.core.$MethodWrapper
at com.google.inject.internal.cglib.core.$DuplicatesPredicate.evaluate (DuplicatesPredicate.java:104)
at com.google.inject.internal.cglib.core.$CollectionUtils.filter (CollectionUtils.java:52)
at com.google.inject.internal.cglib.reflect.$FastClassEmitter.<init> (FastClassEmitter.java:69)
at com.google.inject.internal.cglib.reflect.$FastClass$Generator.generateClass (FastClass.java:77)
at com.google.inject.internal.cglib.core.$DefaultGeneratorStrategy.generate (DefaultGeneratorStrategy.java:25)
at com.google.inject.internal.cglib.core.$AbstractClassGenerator.generate (AbstractClassGenerator.java:332)
at com.google.inject.internal.cglib.core.$AbstractClassGenerator$ClassLoaderData$3.apply (AbstractClassGenerator.java:96)
at com.google.inject.internal.cglib.core.$AbstractClassGenerator$ClassLoaderData$3.apply (AbstractClassGenerator.java:94)
at com.google.inject.internal.cglib.core.internal.$LoadingCache$2.call (LoadingCache.java:54)
at java.util.concurrent.FutureTask.run (FutureTask.java:264)
at com.google.inject.internal.cglib.core.internal.$LoadingCache.createEntry (LoadingCache.java:61)
at com.google.inject.internal.cglib.core.internal.$LoadingCache.get (LoadingCache.java:34)
at com.google.inject.internal.cglib.core.$AbstractClassGenerator$ClassLoaderData.get (AbstractClassGenerator.java:119)
at com.google.inject.internal.cglib.core.$AbstractClassGenerator.create (AbstractClassGenerator.java:294)
at com.google.inject.internal.cglib.reflect.$FastClass$Generator.create (FastClass.java:65)
at com.google.inject.internal.BytecodeGen.newFastClassForMember (BytecodeGen.java:258)
at com.google.inject.internal.BytecodeGen.newFastClassForMember (BytecodeGen.java:207)
at com.google.inject.internal.DefaultConstructionProxyFactory.create (DefaultConstructionProxyFactory.java:49)
at com.google.inject.internal.ProxyFactory.create (ProxyFactory.java:156)
at com.google.inject.internal.ConstructorInjectorStore.createConstructor (ConstructorInjectorStore.java:92)
at com.google.inject.internal.ConstructorInjectorStore.access$000 (ConstructorInjectorStore.java:29)
at com.google.inject.internal.ConstructorInjectorStore$1.create (ConstructorInjectorStore.java:37)
at com.google.inject.internal.ConstructorInjectorStore$1.create (ConstructorInjectorStore.java:33)
at com.google.inject.internal.FailableCache$1.load (FailableCache.java:40)
at com.google.common.cache.LocalCache$LoadingValueReference.loadFuture (LocalCache.java:3540)
at com.google.common.cache.LocalCache$Segment.loadSync (LocalCache.java:2321)
at com.google.common.cache.LocalCache$Segment.lockedGetOrLoad (LocalCache.java:2284)
at com.google.common.cache.LocalCache$Segment.get (LocalCache.java:2199)
at com.google.common.cache.LocalCache.get (LocalCache.java:3951)
at com.google.common.cache.LocalCache.getOrLoad (LocalCache.java:3955)
at com.google.common.cache.LocalCache$LocalLoadingCache.get (LocalCache.java:4870)
at com.google.common.cache.LocalCache$LocalLoadingCache.getUnchecked (LocalCache.java:4876)
at com.google.inject.internal.FailableCache.get (FailableCache.java:51)
at com.google.inject.internal.ConstructorInjectorStore.get (ConstructorInjectorStore.java:48)
at com.google.inject.internal.ConstructorBindingImpl.initialize (ConstructorBindingImpl.java:155)
at com.google.inject.internal.InjectorImpl.initializeBinding (InjectorImpl.java:581)
at com.google.inject.internal.AbstractBindingProcessor$Processor$1.run (AbstractBindingProcessor.java:176)
at com.google.inject.internal.ProcessedBindingData.initializeBindings (ProcessedBindingData.java:49)
at com.google.inject.internal.InternalInjectorCreator.initializeStatically (InternalInjectorCreator.java:122)
at com.google.inject.internal.InternalInjectorCreator.build (InternalInjectorCreator.java:106)
at com.google.inject.Guice.createInjector (Guice.java:87)
at com.google.inject.Guice.createInjector (Guice.java:69)
at com.google.inject.Guice.createInjector (Guice.java:59)
at org.codehaus.plexus.DefaultPlexusContainer.addPlexusInjector (DefaultPlexusContainer.java:481)
at org.codehaus.plexus.DefaultPlexusContainer.<init> (DefaultPlexusContainer.java:206)
at org.apache.maven.cli.MavenCli.container (MavenCli.java:635)
at org.apache.maven.cli.MavenCli.doMain (MavenCli.java:281)
at org.apache.maven.cli.MavenCli.main (MavenCli.java:192)
at jdk.internal.reflect.NativeMethodAccessorImpl.invoke0 (Native Method)
at jdk.internal.reflect.NativeMethodAccessorImpl.invoke (NativeMethodAccessorImpl.java:77)
at jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke (DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke (Method.java:568)
at org.codehaus.plexus.classworlds.launcher.Launcher.launchEnhanced (Launcher.java:282)
at org.codehaus.plexus.classworlds.launcher.Launcher.launch (Launcher.java:225)
at org.codehaus.plexus.classworlds.launcher.Launcher.mainWithExitCode (Launcher.java:406)
at org.codehaus.plexus.classworlds.launcher.Launcher.main (Launcher.java:347)

Answer 1

Hi, @CHEKOOR, Jaya

I understand that you want to use Maven with Java 11 in Azure Cloud Shell.

You cannot change the default installation version of Cloud Shell.
And since you can't use root privileges in Cloud Shell, you can't install additional Java 11 with apt-get.

However, you can additionally manually download and install Java 11.

Microsoft Build of JRE 11 is available at:
https://learn.microsoft.com/en-us/java/openjdk/download

You can expand it to any location and change the environment variables PATH and JAVA_HOME. Maven will be aware of Java 11.

   iwasa_takahito@Azure:~/jdk-11.0.15+10/bin$ export PATH=/home/iwasa_takahito/jdk-11.0.15+10/bin:$PATH  
   iwasa_takahito@Azure:~/jdk-11.0.15+10/bin$ export JAVA_HOME=/home/iwasa_takahito/jdk-11.0.15+10  
     
   iwasa_takahito@Azure:~/jdk-11.0.15+10/bin$ mvn -X  
   Apache Maven 3.6.0  
   Maven home: /usr/share/maven  
   Java version: 11.0.15, vendor: Microsoft, runtime: /home/iwasa_takahito/jdk-11.0.15+10  
   Default locale: en_US, platform encoding: UTF-8  
   OS name: "linux", version: "5.4.0-1078-azure", arch: "amd64", family: "unix"  
   WARNING: An illegal reflective access operation has occurred  
   WARNING: Illegal reflective access by com.google.inject.internal.cglib.core.$ReflectUtils$1 (file:/usr/share/maven/lib/guice.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int,java.security.ProtectionDomain)  
   WARNING: Please consider reporting this to the maintainers of com.google.inject.internal.cglib.core.$ReflectUtils$1  
   WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations  
   WARNING: All illegal access operations will be denied in a future release  
   [DEBUG] Created new class realm maven.api  
   [DEBUG] Importing foreign packages into class realm maven.api  
   [DEBUG]   Imported: javax.annotation.* < plexus.core  
   [DEBUG]   Imported: javax.annotation.security.* < plexus.core  

Answer 2

To downgrade the default Java version installed in the Azure Portal from Java 17 to Java 11, you will need to perform the following steps:

Open the Azure Portal and navigate to the App Service that is using Java 17.

Click on the "Configuration" option in the left-hand menu.

Under the "General settings" section, locate the "Java version" option and click on the "Edit" button next to it.

In the "Java version" settings, select "Java 11" from the drop-down menu.

Click on the "Save" button to apply the changes.

Once the changes are saved, Azure will restart the App Service and configure it to use Java 11 instead of Java 17.

It is important to note that downgrading the Java version may cause compatibility issues with your application. You should thoroughly test your application after the downgrade to ensure that it is functioning correctly. Additionally, if you want to learn more about Java and its different versions, you may want to consider taking a Java course. If you are based in Indore, you can search for Java Training Course in Indore to find options that are available in your area. These courses can provide you with a comprehensive understanding of Java and its various features, and help you develop practical skills in Java programming.