Exception Loading Service class - remotejmx Unsupported major.minor version 51.0

Products

• CA Application Performance Management SaaS
• CA Application Performance Management Agent (APM / Wily / Introscope)
• CA Application Performance Management (APM / Wily / Introscope)
• DX APM SaaS
• DX Application Performance Management

Issue/Introduction

We are seeing the below error while we try to deploy Java agent. We see the application server has Java version 1.6 which is a  compatible version in the APM compatibility guide.

[WARN] [IntroscopeAgent.Agent] Exception Loading Service class - remotejmx
java.lang.UnsupportedClassVersionError: com/ca/apm/agent/remotejmx/RemoteJmxService : Unsupported major.minor version 51.0
 at java.lang.ClassLoader.defineClass1(Native Method)
 at java.lang.ClassLoader.defineClassCond(ClassLoader.java:631)
 at java.lang.ClassLoader.defineClass(ClassLoader.java:615)
 at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:141)
 at java.net.URLClassLoader.defineClass(URLClassLoader.java:283)
 at java.net.URLClassLoader.access$000(URLClassLoader.java:58)
 at java.net.URLClassLoader$1.run(URLClassLoader.java:197)
 at java.security.AccessController.doPrivileged(Native Method)
 at java.net.URLClassLoader.findClass(URLClassLoader.java:190)
 at com.wily.util.extension.JarExtension$AllPermissionsClassLoader.findUsingParent(JarExtension.java:354)
 at com.wily.util.extension.JarExtension$AllPermissionsClassLoader.findClass(JarExtension.java:299)
 at java.lang.ClassLoader.loadClass(ClassLoader.java:306)
 at java.lang.ClassLoader.loadClass(ClassLoader.java:247)
 at com.wily.introscope.agent.service.ServiceAdministrator$ServiceInitializer.faultInClass(ServiceAdministrator.java:506)
 at com.wily.introscope.agent.service.ServiceAdministrator$ServiceInitializer.faultInService(ServiceAdministrator.java:523)
 at com.wily.introscope.agent.service.ServiceAdministrator$ServiceInitializer.startService(ServiceAdministrator.java:538)
 at com.wily.introscope.agent.service.ServiceAdministrator$ServiceInitializer.startServiceSafe(ServiceAdministrator.java:568)
 at com.wily.introscope.agent.service.ServiceAdministrator$ServiceInitializer.IExecutableItem_execute(ServiceAdministrator.java:432)
 at com.wily.util.task.AsynchExecutionQueue$WrapperItem.IExecutableItem_execute(AsynchExecutionQueue.java:414)
 at com.wily.util.task.AsynchExecutionQueue.doTask(AsynchExecutionQueue.java:205)
 at com.wily.util.task.ATask$CoreTask.run(ATask.java:132)
 at java.lang.Thread.run(Thread.java:662) 

Environment

Release : 20.2

Component :

Cause

The new JMX extension, jmx-tomcat-xt23-21.4.0.26 in this instance, requires Java 1.7 or later

Resolution

The legacy JMX support is still present so the solution is to use that and remove the jmx extension form the list of bundles deployed/enabled in the extensions.profile).

 For this specific situation delete the string 
 
jmx-tomcat-xt23-21.4.0.26,
 
from the property value for
 
introscope.agent.extensions.bundles.load