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java.lang.ClassCastException: 	at weblogic.management.configuration.StartupClassMBean_Helper.validateAttribute(StartupClassMBean_Helper.java:56)	at weblogic.management.info.ExtendedInfo.validateAttribute(ExtendedInfo.java:323)	at weblogic.management.internal.DynamicMBeanImpl.checkAttributeValueIsLegal(DynamicMBeanImpl.java:1592)	at weblogic.management.internal.DynamicMBeanImpl.prepareForModification(DynamicMBeanImpl.java:1527)	at weblogic.management.internal.DynamicMBeanImpl.setAttribute(DynamicMBeanImpl.java:1046)	at weblogic.management.internal.ConfigurationMBeanImpl.setAttribute(ConfigurationMBeanImpl.java:329)	at com.sun.management.jmx.MBeanServerImpl.setAttribute(MBeanServerImpl.java:1358)	at com.sun.management.jmx.MBeanServerImpl.setAttribute(MBeanServerImpl.java:1333)	at weblogic.management.internal.RemoteMBeanServerImpl.private_setAttribute(RemoteMBeanServerImpl.java:415)	at weblogic.management.internal.RemoteMBeanServerImpl.setAttribute(RemoteMBeanServerImpl.java:371)	at weblogic.management.internal.RemoteMBeanServerImpl_WLSkel.invoke(Unknown Source)	at weblogic.rmi.internal.BasicServerRef.invoke(BasicServerRef.java:477)	at weblogic.rmi.internal.BasicServerRef$1.run(BasicServerRef.java:420)	at weblogic.security.acl.internal.AuthenticatedSubject.doAs(AuthenticatedSubject.java:353)	at weblogic.security.service.SecurityManager.runAs(SecurityManager.java:144)	at weblogic.rmi.internal.BasicServerRef.handleRequest(BasicServerRef.java:415)	at weblogic.rmi.internal.BasicExecuteRequest.execute(BasicExecuteRequest.java:30)	at weblogic.kernel.ExecuteThread.execute(ExecuteThread.java:197)	at weblogic.kernel.ExecuteThread.run(ExecuteThread.java:170)