java.lang.NoClassDefFoundError: Could not initialize class com.ibm.ws.util.WsObjectInputStream
   at com.ibm.ws.management.connector.soap.GenericSerializer.unmarshall(GenericSerializer.java:219)
   at org.apache.soap.util.xml.XMLJavaMappingRegistry.unmarshall(XMLJavaMappingRegistry.java:0)
   at org.apache.soap.encoding.soapenc.ParameterSerializer.unmarshall(ParameterSerializer.java:0)
   at org.apache.soap.util.xml.XMLJavaMappingRegistry.unmarshall(XMLJavaMappingRegistry.java:0)
   at org.apache.soap.rpc.RPCMessage.unmarshall(RPCMessage.java:0)
   at org.apache.soap.rpc.RPCMessage.extractFromEnvelope(RPCMessage.java:0)
   at org.apache.soap.rpc.Response.extractFromEnvelope(Response.java:0)
   at org.apache.soap.rpc.Call.invoke(Call.java:0)
   at com.ibm.ws.management.connector.soap.SOAPConnectorClient$8.run(SOAPConnectorClient.java:707)
   at java.security.AccessController.doPrivileged(AccessController.java:0)
   at com.ibm.ws.security.util.AccessController.doPrivileged(AccessController.java:125)
   at com.ibm.ws.management.connector.soap.SOAPConnectorClient.invokeTemplate(SOAPConnectorClient.java:700)
   at com.ibm.ws.management.connector.soap.SOAPConnectorClient.isAlive(SOAPConnectorClient.java:488)
   at com.ibm.ws.management.connector.soap.SOAPConnectorClient.invoke(SOAPConnectorClient.java:418)
   at $Proxy31.isAlive(.java:0)
   at com.ibm.ws.management.AdminClientImpl.isAlive(AdminClientImpl.java:84)
   at com.ibm.websphere.management.AdminClientFactory.createAdminClient(AdminClientFactory.java:230)
   at com.ibm.ws.management.application.j2ee.deploy.spi.DeploymentManagerImpl.connect(DeploymentManagerImpl.java:178)
   at com.ibm.ws.management.application.j2ee.deploy.spi.factories.DeploymentFactoryImpl.getDeploymentManager(DeploymentFactoryImpl.java:186)
   at org.netbeans.modules.j2ee.websphere6.WSDeploymentManager.updateDeploymentManager(WSDeploymentManager.java:445)
   at org.netbeans.modules.j2ee.websphere6.WSDeploymentManager.getTargets(WSDeploymentManager.java:934)
   at org.netbeans.modules.j2ee.deployment.impl.ServerInstance.getTargetMap(ServerInstance.java:556)
   at org.netbeans.modules.j2ee.deployment.impl.ServerInstance.getTargets(ServerInstance.java:514)
   at org.netbeans.modules.j2ee.deployment.impl.ServerInstance._retrieveTarget(ServerInstance.java:1764)
   at org.netbeans.modules.j2ee.deployment.impl.ServerInstance.isSuspended(ServerInstance.java:947)
   at org.netbeans.modules.j2ee.deployment.impl.ServerInstance$1.run(ServerInstance.java:386)
Caused: org.openide.util.RequestProcessor$SlowItem: task failed due to: java.lang.NoClassDefFoundError: Could not initialize class com.ibm.ws.util.WsObjectInputStream
   at org.openide.util.RequestProcessor.post(RequestProcessor.java:422)
   at org.netbeans.modules.j2ee.deployment.impl.ServerInstance.refresh(ServerInstance.java:362)
   at org.netbeans.modules.j2ee.deployment.impl.ServerInstance.start(ServerInstance.java:1057)
   at org.netbeans.modules.j2ee.deployment.impl.ui.actions.StartAction$1.run(StartAction.java:110)
   at org.openide.util.RequestProcessor$Task.run(RequestProcessor.java:1418)
   at org.openide.util.RequestProcessor$Processor.run(RequestProcessor.java:1957)