java.lang.NullPointerException

GitHub | fpoolev | 6 months ago
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    Why this method using reflections throws npe?

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    java.lang.NullPointerException
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Root Cause Analysis

  1. java.lang.NullPointerException

    No message provided

    at sun.reflect.UnsafeFieldAccessorImpl.ensureObj()
  2. Java RT
    Field.get
    1. sun.reflect.UnsafeFieldAccessorImpl.ensureObj(UnsafeFieldAccessorImpl.java:57)
    2. sun.reflect.UnsafeObjectFieldAccessorImpl.get(UnsafeObjectFieldAccessorImpl.java:36)
    3. java.lang.reflect.Field.get(Field.java:393)
    3 frames
  3. Spring Core
    ReflectionUtils.getField
    1. org.springframework.util.ReflectionUtils.getField(ReflectionUtils.java:143)
    1 frame
  4. org.socialsignin.spring
    SimpleDynamoDBCrudRepository.findOne
    1. org.socialsignin.spring.data.dynamodb.repository.support.CompositeIdHashAndRangeKeyExtractor.getHashKey(CompositeIdHashAndRangeKeyExtractor.java:44)
    2. org.socialsignin.spring.data.dynamodb.repository.support.DynamoDBIdIsHashAndRangeKeyEntityInformationImpl.getHashKey(DynamoDBIdIsHashAndRangeKeyEntityInformationImpl.java:56)
    3. org.socialsignin.spring.data.dynamodb.repository.support.SimpleDynamoDBCrudRepository.findOne(SimpleDynamoDBCrudRepository.java:72)
    3 frames
  5. 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
  6. Spring Data Core
    RepositoryFactorySupport$QueryExecutorMethodInterceptor.invoke
    1. org.springframework.data.repository.core.support.RepositoryFactorySupport$QueryExecutorMethodInterceptor.executeMethodOn(RepositoryFactorySupport.java:483)
    2. org.springframework.data.repository.core.support.RepositoryFactorySupport$QueryExecutorMethodInterceptor.doInvoke(RepositoryFactorySupport.java:468)
    3. org.springframework.data.repository.core.support.RepositoryFactorySupport$QueryExecutorMethodInterceptor.invoke(RepositoryFactorySupport.java:440)
    3 frames
  7. Spring AOP
    ReflectiveMethodInvocation.proceed
    1. org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179)
    1 frame
  8. org.springframework.data
    DefaultMethodInvokingMethodInterceptor.invoke
    1. org.springframework.data.projection.DefaultMethodInvokingMethodInterceptor.invoke(DefaultMethodInvokingMethodInterceptor.java:61)
    1 frame
  9. Spring AOP
    JdkDynamicAopProxy.invoke
    1. org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179)
    2. org.springframework.aop.interceptor.ExposeInvocationInterceptor.invoke(ExposeInvocationInterceptor.java:92)
    3. org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179)
    4. org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:208)
    4 frames