NullPointerException running equals verifier on a class.

[Chris Stoner]

I'm having the following Exception when running the verifier:

java.lang.AssertionError: java.lang.NullPointerException: 

For more information, go to: http://www.jqno.nl/equalsverifier/errormessages

at nl.jqno.equalsverifier.EqualsVerifier.handleError(EqualsVerifier.java:406)

at nl.jqno.equalsverifier.EqualsVerifier.verify(EqualsVerifier.java:392)

at com.ge.hc.lcs.sumfutil.asc.UmfDeviceImplTest.equalsVerifier(UmfDeviceImplTest.java:106)

at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)

at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)

at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)

at java.lang.reflect.Method.invoke(Method.java:497)

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.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.junit.runner.JUnitCore.run(JUnitCore.java:160)

at com.intellij.junit4.JUnit4IdeaTestRunner.startRunnerWithArgs(JUnit4IdeaTestRunner.java:69)

at com.intellij.rt.execution.junit.JUnitStarter.prepareStreamsAndStart(JUnitStarter.java:234)

at com.intellij.rt.execution.junit.JUnitStarter.main(JUnitStarter.java:74)

at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)

at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)

at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)

at java.lang.reflect.Method.invoke(Method.java:497)

at com.intellij.rt.execution.application.AppMain.main(AppMain.java:144)

Caused by: java.lang.NullPointerException

at com.rti.dds.util.Enum.equals(Unknown Source)

at nl.jqno.equalsverifier.util.PrefabValues.getOther(PrefabValues.java:138)

at nl.jqno.equalsverifier.util.FieldAccessor$FieldChanger.modify(FieldAccessor.java:272)

at nl.jqno.equalsverifier.util.FieldAccessor.modify(FieldAccessor.java:163)

at nl.jqno.equalsverifier.util.FieldAccessor.changeField(FieldAccessor.java:153)

at nl.jqno.equalsverifier.util.ObjectAccessor.scramble(ObjectAccessor.java:153)

at nl.jqno.equalsverifier.util.ClassAccessor.getRedAccessor(ClassAccessor.java:261)

at nl.jqno.equalsverifier.util.ClassAccessor.getRedObject(ClassAccessor.java:251)

at nl.jqno.equalsverifier.util.PrefabValues.createAndPutInstances(PrefabValues.java:243)

at nl.jqno.equalsverifier.util.PrefabValues.putFor(PrefabValues.java:197)

at nl.jqno.equalsverifier.util.PrefabValues.putFor(PrefabValues.java:173)

at nl.jqno.equalsverifier.util.FieldAccessor.createPrefabValues(FieldAccessor.java:194)

at nl.jqno.equalsverifier.util.FieldAccessor.access$300(FieldAccessor.java:28)

at nl.jqno.equalsverifier.util.FieldAccessor$FieldChanger.modify(FieldAccessor.java:276)

at nl.jqno.equalsverifier.util.FieldAccessor.modify(FieldAccessor.java:163)

at nl.jqno.equalsverifier.util.FieldAccessor.changeField(FieldAccessor.java:153)

at nl.jqno.equalsverifier.util.ObjectAccessor.scramble(ObjectAccessor.java:153)

at nl.jqno.equalsverifier.util.ClassAccessor.getRedAccessor(ClassAccessor.java:261)

at nl.jqno.equalsverifier.util.ClassAccessor.getRedObject(ClassAccessor.java:251)

at nl.jqno.equalsverifier.AbstractDelegationChecker.check(AbstractDelegationChecker.java:49)

at nl.jqno.equalsverifier.EqualsVerifier.verifyWithoutExamples(EqualsVerifier.java:428)

at nl.jqno.equalsverifier.EqualsVerifier.performVerification(EqualsVerifier.java:416)

at nl.jqno.equalsverifier.EqualsVerifier.verify(EqualsVerifier.java:386)

... 27 more

The class in question is fairly simple, I even stripped all of the logic out of it and ran I'm still having the same issue.

[Jan Ouwens]

Hi Chris,

Can you show me the class that causes this problem? Also, how do you call EqualsVerifier?

The stacktrace doesn’t give me enough information to reproduce this problem.

Jan

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[Chris Stoner]

Class and Interface in question are attached.

Junit Call:

    @Test

    public void equalsVerifier() {

        EqualsVerifier.forClass(UmfDeviceImpl.class).usingGetClass()

                .suppress(Warning.NULL_FIELDS)

                .suppress(Warning.STRICT_INHERITANCE)

                .verify();

[Jan Ouwens]

Hi Chris,

Thanks for the example code. Unfortunately, it contains a lot of types that I don’t know the definition of, so I can’t actually run it and see what’s going on.

A closer look at the stacktrace showed me this, though:

Caused by: java.lang.NullPointerException

at com.rti.dds.util.Enum.equals(Unknown Source)

In other words, the exception is actually thrown from code that’s not part of EqualsVerifier. I’m not sure what it is. Maybe it’s your code, or maybe it comes from a library that you use. Do you have the source for it?

I’m guessing it may be a superclass for an enum type that you have in your code; maybe UmfTopicEnum.

Jan

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