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Error while processing sampler 'Java Request' : java.lang.NullPointerException
jmeter.threads.JMeterThread: Error while processing sampler 'Java Request' : java.lang.NullPointerException	at org.apache.jmeter.protocol.java.sampler.JavaSampler.sample(JavaSampler.java:199)	at org.apache.jmeter.threads.JMeterThread.executeSamplePackage(JMeterThread.java:465)	at org.apache.jmeter.threads.JMeterThread.processSampler(JMeterThread.java:410)	at org.apache.jmeter.threads.JMeterThread.run(JMeterThread.java:241)