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java.lang.NullPointerException at org.wso2.carbon.apimgt.usage.publisher.APIMgtUsageDataBridgeDataPublisher.publishEvent(APIMgtUsageDataBridgeDataPublisher.java:140) at org.wso2.carbon.apimgt.usage.publisher.APIMgtResponseHandler.mediate(APIMgtResponseHandler.java:211) at org.apache.synapse.mediators.ext.ClassMediator.mediate(ClassMediator.java:84) at org.apache.synapse.mediators.AbstractListMediator.mediate(AbstractListMediator.java:81) at org.apache.synapse.mediators.AbstractListMediator.mediate(AbstractListMediator.java:48) at org.apache.synapse.mediators.base.SequenceMediator.mediate(SequenceMediator.java:155) at org.apache.synapse.rest.Resource.process(Resource.java:297) at org.apache.synapse.rest.API.process(API.java:335) at org.apache.synapse.rest.RESTRequestHandler.dispatchToAPI(RESTRequestHandler.java:86) at org.apache.synapse.rest.RESTRequestHandler.process(RESTRequestHandler.java:52) at org.apache.synapse.core.axis2.Axis2SynapseEnvironment.injectMessage(Axis2SynapseEnvironment.java:295) at org.apache.synapse.core.axis2.SynapseCallbackReceiver.handleMessage(SynapseCallbackReceiver.java:529) at org.apache.synapse.core.axis2.SynapseCallbackReceiver.receive(SynapseCallbackReceiver.java:172) at org.apache.axis2.engine.AxisEngine.receive(AxisEngine.java:180) at org.apache.synapse.transport.passthru.ClientWorker.run(ClientWorker.java:251) at org.apache.axis2.transport.base.threads.NativeWorkerPool$1.run(NativeWorkerPool.java:172) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615) at java.lang.Thread.run(Thread.java:745)