java.lang.NullPointerException

Stack Overflow | Mincong Huang | 7 months ago
tip
Click on the to mark the solution that helps you, Samebug will learn from it.
As a community member, you’ll be rewarded for you help.

Root Cause Analysis

  1. java.lang.NullPointerException

    No message provided

    at io.mincongh.zoo.ZooKeeper.doubleCountAnimal()
  2. io.mincongh.zoo
    ZooKeeperMockTest.testDoubleCountAnimal
    1. io.mincongh.zoo.ZooKeeper.doubleCountAnimal(ZooKeeper.java:14)
    2. io.mincongh.zoo.mockito.ZooKeeperMockTest.testDoubleCountAnimal(ZooKeeperMockTest.java:42)
    2 frames
  3. Java RT
    Method.invoke
    1. sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    2. sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    3. sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    4. java.lang.reflect.Method.invoke(Method.java:498)
    4 frames
  4. JUnit
    ParentRunner.run
    1. org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:50)
    2. org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
    3. org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:47)
    4. org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17)
    5. org.junit.internal.runners.statements.RunBefores.evaluate(RunBefores.java:26)
    6. org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:325)
    7. org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:78)
    8. org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:57)
    9. org.junit.runners.ParentRunner$3.run(ParentRunner.java:290)
    10. org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:71)
    11. org.junit.runners.ParentRunner.runChildren(ParentRunner.java:288)
    12. org.junit.runners.ParentRunner.access$000(ParentRunner.java:58)
    13. org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:268)
    14. org.junit.runners.ParentRunner.run(ParentRunner.java:363)
    14 frames
  5. JUnit4 Provider
    JUnit4Provider.invoke
    1. org.apache.maven.surefire.junit4.JUnit4Provider.execute(JUnit4Provider.java:252)
    2. org.apache.maven.surefire.junit4.JUnit4Provider.executeTestSet(JUnit4Provider.java:141)
    3. org.apache.maven.surefire.junit4.JUnit4Provider.invoke(JUnit4Provider.java:112)
    3 frames
  6. Java RT
    Method.invoke
    1. sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    2. sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    3. sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    4. java.lang.reflect.Method.invoke(Method.java:498)
    4 frames
  7. SureFire
    ForkedBooter.main
    1. org.apache.maven.surefire.util.ReflectionUtils.invokeMethodWithArray(ReflectionUtils.java:189)
    2. org.apache.maven.surefire.booter.ProviderFactory$ProviderProxy.invoke(ProviderFactory.java:165)
    3. org.apache.maven.surefire.booter.ProviderFactory.invokeProvider(ProviderFactory.java:85)
    4. org.apache.maven.surefire.booter.ForkedBooter.runSuitesInProcess(ForkedBooter.java:115)
    5. org.apache.maven.surefire.booter.ForkedBooter.main(ForkedBooter.java:75)
    5 frames