For the above scenario I tried following private JpdlProcessDefinition loadProcessDefinition() throws IOException { JpdlParser jpdlParser = new JpdlParser(); Parse parse = jpdlParser.createParse(); String fileLocation ="*****.jpdl.xml"; FileInputStream inputStream = new FileInputStream(fileLocation); parse.setInputStream(inputStream); parse.execute(); return (JpdlProcessDefinition ) parse.getDocumentObject(); } and from calling section had this block ProcessDefinitionImpl processDefinition = loadProcessDefinition(); | ClientProcessInstance ci = processDefinition.createProcessInstance(); | ci.createVariable("arg", publishArgs); | ci.createVariable("fc", fc); | ci.start(); But I get the exception , org.jbpm.pvm.internal.wire.WireException: couldn't invoke method execute: couldn't create argument 1: null at org.jbpm.jpdl.internal.activity.JavaActivity.perform(JavaActivity.java:97) at org.jbpm.jpdl.internal.activity.JpdlAutomaticActivity.execute(JpdlAutomaticActivity.java:14) at org.jbpm.pvm.internal.model.op.ExecuteActivity.perform(ExecuteActivity.java:60) at org.jbpm.pvm.internal.model.ExecutionImpl.performAtomicOperationSync(ExecutionImpl.java:625) at org.jbpm.pvm.internal.model.ExecutionImpl.performAtomicOperation(ExecutionImpl.java:585) at org.jbpm.pvm.internal.model.ExecutionImpl.start(ExecutionImpl.java:198) at com.test.flow.FlowController$1.run(FlowController.java:90) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:55) Caused by: java.lang.Exception: couldn't create argument 1: null at org.jbpm.pvm.internal.wire.descriptor.ObjectDescriptor.getArgs(ObjectDescriptor.java:348) at org.jbpm.jpdl.internal.activity.JavaActivity.perform(JavaActivity.java:79) ... 7 more Caused by: java.lang.NullPointerException at org.jbpm.pvm.internal.script.EnvironmentBindings.getReadContext(EnvironmentBindings.java:61) at org.jbpm.pvm.internal.script.EnvironmentBindings.containsKey(EnvironmentBindings.java:72) at javax.script.SimpleScriptContext.getAttribute(SimpleScriptContext.java:143) at org.jbpm.pvm.internal.script.JuelScriptEngine.toELContext(JuelScriptEngine.java:94) at org.jbpm.pvm.internal.script.JuelScriptEngine.parse(JuelScriptEngine.java:162) at org.jbpm.pvm.internal.script.JuelScriptEngine.eval(JuelScriptEngine.java:62) at javax.script.AbstractScriptEngine.eval(AbstractScriptEngine.java:84) at org.jbpm.pvm.internal.script.ScriptManager.evaluate(ScriptManager.java:116) at org.jbpm.pvm.internal.script.ScriptManager.evaluate(ScriptManager.java:108) at org.jbpm.pvm.internal.script.ScriptManager.evaluateExpression(ScriptManager.java:80) at org.jbpm.pvm.internal.wire.descriptor.ObjectDescriptor.construct(ObjectDescriptor.java:180) at org.jbpm.pvm.internal.wire.WireContext.construct(WireContext.java:473) at org.jbpm.pvm.internal.wire.WireContext.create(WireContext.java:452) at org.jbpm.pvm.internal.wire.descriptor.ObjectDescriptor.getArgs(ObjectDescriptor.java:343) ... 8 more Any help on how to resolve this .... View the original post : http://www.jboss.org/index.html?module=bb&op=viewtopic&p=4252818#... Reply to the post : http://www.jboss.org/index.html?module=bb&op=posting&mode=reply&a...