Using JBDS process designer, user can set boundary error event without validation error, but the process will throw Exception at runtime

Issue

Using JBDS process designer, user can set a boundary error event without validation error. However when user starts the process, following ERROR is thrown:

java.lang.IllegalArgumentException: Cannot add asset: unable to parse xml : Exception class java.lang.NullPointerException : null,
    at org.jbpm.runtime.manager.impl.SimpleRuntimeEnvironment.addAsset(SimpleRuntimeEnvironment.java:111)
    at org.jbpm.runtime.manager.impl.RuntimeEnvironmentBuilder.addAsset(RuntimeEnvironmentBuilder.java:281)
    at org.jbpm.runtime.manager.impl.RuntimeEnvironmentBuilder.addAsset(RuntimeEnvironmentBuilder.java:56)
    at org.jbpm.test.JbpmJUnitBaseTestCase.createRuntimeManager(JbpmJUnitBaseTestCase.java:308)
    at org.jbpm.test.JbpmJUnitBaseTestCase.createRuntimeManager(JbpmJUnitBaseTestCase.java:235)
    at org.jbpm.test.JbpmJUnitBaseTestCase.createRuntimeManager(JbpmJUnitBaseTestCase.java:217)
    at com.sample.ProcessTest.testProcess(ProcessTest.java:17)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:606)
    at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:47)
    at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
    at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:44)
    at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17)
    at org.junit.internal.runners.statements.RunBefores.evaluate(RunBefores.java:26)
    at org.junit.internal.runners.statements.RunAfters.evaluate(RunAfters.java:27)
    at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:271)
    at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:70)
    at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:50)
    at org.junit.runners.ParentRunner$3.run(ParentRunner.java:238)
    at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:63)
    at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:236)
    at org.junit.runners.ParentRunner.access$000(ParentRunner.java:53)
    at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:229)
    at org.junit.runners.ParentRunner.run(ParentRunner.java:309)
    at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:50)
    at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38)
    at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:467)
    at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:683)
    at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:390)
    at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:197)

The bpmn file(jbds_bad.bpmn) and a screenshot for JBDS(evidence1.png) is attached