SOLVED NoClassDefFoundError MBeanUtils on Weblogic 12c

[yltalex]

Hello,
I downloaded the latest WLSDM (Version: v3.9.2-b4318) and created new managed server on weblogic, add needed configuration and after stratup see error with NoClassDefFoundError : MBeanUtils.

<Nov 29, 2022 10:36:30,393 AM UTC>
<Nov 29, 2022 10:36:35,092 AM UTC> <Servlet: “wlsdm-background” failed to preload on startup in Web application: “wlsdm.war”.
java.lang.NoClassDefFoundError: com/bea/console/utils/MBeanUtils
at com.wlsdm.R.P.getDomainRuntimeMBeanServerConnection(MBSConnection.java:352)
at com.wlsdm.R.P.getAvailableConnection(MBSConnection.java:794)
at com.wlsdm.E.A.A.G.check(DomainModule.java:95)
at com.wlsdm.T.C.H(StartupProcess.java:163)
at com.wlsdm.T.C.fire(StartupProcess.java:111)
Truncated. see log file for complete stacktrace
Caused By: java.lang.ClassNotFoundException: com.bea.console.utils.MBeanUtils
at weblogic.utils.classloaders.GenericClassLoader.findLocalClass(GenericClassLoader.java:1029)
at weblogic.utils.classloaders.GenericClassLoader.findClass(GenericClassLoader.java:990)
at weblogic.utils.classloaders.ChangeAwareClassLoader.findClass(ChangeAwareClassLoader.java:101)
at weblogic.utils.classloaders.GenericClassLoader.doFindClass(GenericClassLoader.java:611)
at weblogic.utils.classloaders.GenericClassLoader.loadClass(GenericClassLoader.java:543)
Truncated. see log file for complete stacktrace

<Nov 29, 2022 10:36:35,140 AM UTC> <Unable to set the activation state to true for the application “wlsdm”.
weblogic.application.ModuleException: java.lang.ClassNotFoundException: com.bea.console.utils.MBeanUtils
at weblogic.application.internal.ExtensibleModuleWrapper.start(ExtensibleModuleWrapper.java:140)
at weblogic.application.internal.flow.ModuleListenerInvoker.start(ModuleListenerInvoker.java:124)
at weblogic.application.internal.flow.ModuleStateDriver$3.next(ModuleStateDriver.java:233)
at weblogic.application.internal.flow.ModuleStateDriver$3.next(ModuleStateDriver.java:228)
at weblogic.application.utils.StateMachineDriver.nextState(StateMachineDriver.java:45)
Truncated. see log file for complete stacktrace
Caused By: java.lang.ClassNotFoundException: com.bea.console.utils.MBeanUtils
at weblogic.utils.classloaders.GenericClassLoader.findLocalClass(GenericClassLoader.java:1029)
at weblogic.utils.classloaders.GenericClassLoader.findClass(GenericClassLoader.java:990)
at weblogic.utils.classloaders.ChangeAwareClassLoader.findClass(ChangeAwareClassLoader.java:101)
at weblogic.utils.classloaders.GenericClassLoader.doFindClass(GenericClassLoader.java:611)
at weblogic.utils.classloaders.GenericClassLoader.loadClass(GenericClassLoader.java:543)
Truncated. see log file for complete stacktrace

My Weblogic is 12.2.1.4.0.
I could not find help such error, could you help my to fix it or just propose another version?

Thank you and regards,
Oles

[can.sahin-wlsdmteam]

@yltalex

Hi,

It looks like you are deployed the WLSDM war file as a web application. Please make sure the installation is not done trough this way. If it is, follow the below steps to install it as a console extension.

1- Add wlsdm_agent.jar to Managed Server’s JVM Arguments *${JAVA_OPTIONS}
2- Copy wlsdm.war file to WebLogic domain’s console-ext folder
3-(Re)start WebLogic Administration Server and Managed Server(s)
4- That’s all! WLSDM console will deploy automatically
5- Login to WLSDM Console then complete configuration wizard once
6- Start proactive monitoring and move forward WebLogic operations!

Link: https://wlsdm.com/docs/README#VI.Installation

Regards.

[yltalex]

@can-sahin-wlsdmteam

I was confused with console-ext folder before … issue resolved. Thank you very much!