Using Server Agent #22.4.0.33722 running on Java 21 and agent is unable to startup

[James_Gardner]

Java version
openjdk 21-ea 2023-09-19
OpenJDK Runtime Environment (build 21-ea+23-1988)
OpenJDK 64-Bit Server VM (build 21-ea+23-1988, mixed mode, sharing)

Startup flags 
java -Dappdynamics.jvm.shutdown.mark.node.as.historical=true -Dappdynamics.agent.log4j2.disabled=true -javaagent:/appdynamics/javaagent.jar

From what I understand this version of the agent should work with openjdk21 but please correct me if i'm wrong..
any suggestions on what I can do to get this to startup?

At startup I see below log. Which to me means the agent can't startup because of an incompatible java version

Class with name [com.ibm.lang.management.internal.ExtendedOperatingSystemMXBeanImpl] is not available in classpath, so will ignore export access.
java.lang.ClassNotFoundException: Unable to load class io.opentelemetry.sdk.autoconfigure.spi.ResourceProvider
at com.singularity.ee.agent.appagent.kernel.classloader.Post19AgentClassLoader.findClass(Post19AgentClassLoader.java:88)
at com.singularity.ee.agent.appagent.kernel.classloader.AgentClassLoader.loadClassInternal(AgentClassLoader.java:456)
at com.singularity.ee.agent.appagent.kernel.classloader.Post17AgentClassLoader.loadClassParentLast(Post17AgentClassLoader.java:81)
at com.singularity.ee.agent.appagent.kernel.classloader.AgentClassLoader.loadClass(AgentClassLoader.java:354)
at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:526)
at java.base/java.lang.Class.forName0(Native Method)
at java.base/java.lang.Class.forName(Class.java:497)
at java.base/java.lang.Class.forName(Class.java:476)
at com.singularity.ee.agent.appagent.AgentEntryPoint.createJava9Module(AgentEntryPoint.java:800)
at com.singularity.ee.agent.appagent.AgentEntryPoint.premain(AgentEntryPoint.java:639)
at java.base/jdk.internal.reflect.DirectMethodHandleAccessor.invoke(DirectMethodHandleAccessor.java:103)
at java.base/java.lang.reflect.Method.invoke(Method.java:578)
at java.instrument/sun.instrument.InstrumentationImpl.loadClassAndStartAgent(InstrumentationImpl.java:491)
at java.instrument/sun.instrument.InstrumentationImpl.loadClassAndCallPremain(InstrumentationImpl.java:503)
[AD Agent init] Fri Aug 30 20:35:48 UTC 2024[DEBUG]: JavaAgent - Setting AgentClassLoader as Context ClassLoader
[AD Agent init] Fri Aug 30 20:35:48 UTC 2024[DEBUG]: JavaAgent - Setting AgentClassLoader as Context ClassLoader
java.lang.IllegalArgumentException: Unsupported class file major version 65
at com.appdynamics.appagent/com.singularity.asm.org.objectweb.asm.ClassReader.<init>(ClassReader.java:199)
at com.appdynamics.appagent/com.singularity.asm.org.objectweb.asm.ClassReader.<init>(ClassReader.java:180)
at com.appdynamics.appagent/com.singularity.asm.org.objectweb.asm.ClassReader.<init>(ClassReader.java:166)
at com.appdynamics.appagent/com.singularity.ee.agent.appagent.services.bciengine.asm.PreTransformer.preTransform(PreTransformer.java:49)
at com.appdynamics.appagent/com.singularity.ee.agent.appagent.kernel.JavaAgent.preloadAgentClassesForDeadlockProneJVM(JavaAgent.java:656)
at com.appdynamics.appagent/com.singularity.ee.agent.appagent.kernel.JavaAgent.initialize(JavaAgent.java:404)
at com.appdynamics.appagent/com.singularity.ee.agent.appagent.kernel.JavaAgent.initialize(JavaAgent.java:347)
at java.base/jdk.internal.reflect.DirectMethodHandleAccessor.invoke(DirectMethodHandleAccessor.java:103)
at java.base/java.lang.reflect.Method.invoke(Method.java:578)
at com.singularity.ee.agent.appagent.AgentEntryPoint$1.run(AgentEntryPoint.java:656)

[iamryan]

Hi @James.Gardner,

Thanks for following up. I think it might be best to contact Support in this case. 
AppDynamics is migrating our Support case handling system to Cisco Support Case Manager (SCM). Read ... 
Note: The Community is currently on temporary lockdown while we deal with a spam attack. So you will not be able to reply or create any new content in the meantime. 

[iamryan]

Hi @James.Gardner,

I found this Docs page that shows Supported Environments: https://docs.appdynamics.com/appd/24.x/24.8/en/application-monitoring/app-server-agents-supported-en...

[James_Gardner]

Thanks Ryan, Yeah I've seen that page and from what I can see in that page is my appd should works with the version of java I'm using