java.lang.NullPointerException

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  • java.lang.NullPointerException at org.eclipse.paho.client.mqttv3.MqttTopic.validate(MqttTopic.java:147) at org.eclipse.paho.client.mqttv3.MqttAsyncClient.unsubscribe(MqttAsyncClient.java:917) at org.eclipse.paho.client.mqttv3.MqttAsyncClient.unsubscribe(MqttAsyncClient.java:898) at com.ibm.iotf.devicemgmt.device.ManagedDevice.unsubscribe(ManagedDevice.java:636) at com.ibm.iotf.devicemgmt.device.ManagedDevice$ManagedDeviceClient.unsubscribe(ManagedDevice.java:977) at com.ibm.internal.iotf.devicemgmt.handler.DMRequestHandler.clearRequestHandlers(DMRequestHandler.java:239) at com.ibm.iotf.devicemgmt.device.ManagedDevice.sendUnmanageRequest(ManagedDevice.java:530) at com.ibm.iotcloud.test.jmeter.sampler.dm.FirmwareActions.deleteDevice(FirmwareActions.java:193) at com.ibm.iotcloud.test.jmeter.sampler.dm.FirmwareActions.teardownTest(FirmwareActions.java:256) at org.apache.jmeter.protocol.java.sampler.JavaSampler.testEnded(JavaSampler.java:292) at org.apache.jmeter.engine.StandardJMeterEngine.notifyTestListenersOfEnd(StandardJMeterEngine.java:215) at org.apache.jmeter.engine.StandardJMeterEngine.run(StandardJMeterEngine.java:436) at java.lang.Thread.run(Unknown Source)
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