java.lang.NullPointerException

Spring JIRA | Björn Voß | 3 years ago
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  1. 0

    The cache seems not to be able to handle heavy load during its warmup phase. We use 42 threads in parallel in performance test scenario (a lot of database operations in each thread) and got the NPE in one of five runs. Using a ConcurrentHashMap solves the problem. {code} java.lang.NullPointerException at org.springframework.data.mongodb.core.convert.CustomConversions.getCustomReadTarget(CustomConversions.java:329) at org.springframework.data.mongodb.core.convert.CustomConversions.hasCustomReadTarget(CustomConversions.java:283) at org.springframework.data.mongodb.core.convert.MappingMongoConverter.read(MappingMongoConverter.java:200) at org.springframework.data.mongodb.core.convert.MappingMongoConverter.read(MappingMongoConverter.java:187) at org.springframework.data.mongodb.core.convert.MappingMongoConverter.read(MappingMongoConverter.java:183) at org.springframework.data.mongodb.core.convert.MappingMongoConverter.read(MappingMongoConverter.java:77) at org.springframework.data.mongodb.core.MongoTemplate$ReadDbObjectCallback.doWith(MongoTemplate.java:1975) at org.springframework.data.mongodb.core.MongoTemplate.executeFindOneInternal(MongoTemplate.java:1626) at org.springframework.data.mongodb.core.MongoTemplate.doFindOne(MongoTemplate.java:1446) at org.springframework.data.mongodb.core.MongoTemplate.findById(MongoTemplate.java:539) at org.springframework.data.mongodb.repository.support.SimpleMongoRepository.findOne(SimpleMongoRepository.java:100) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:606) at org.springframework.data.repository.core.support.RepositoryFactorySupport$QueryExecutorMethodInterceptor.executeMethodOn(RepositoryFactorySupport.java:358) at org.springframework.data.repository.core.support.RepositoryFactorySupport$QueryExecutorMethodInterceptor.invoke(RepositoryFactorySupport.java:343) at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:172) at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:204) at com.sun.proxy.$Proxy26.findOne(Unknown Source) at de.is24.offer.mongodb.evaluation.ReadYourOwnDataRightTask.countNumberOfInvalidResults(ReadYourOwnDataRightTask.java:34) at de.is24.offer.mongodb.evaluation.ReadYourOwnDataRightTask$$FastClassByCGLIB$$2b453a69.invoke(<generated>) at org.springframework.cglib.proxy.MethodProxy.invoke(MethodProxy.java:204) at org.springframework.aop.framework.CglibAopProxy$CglibMethodInvocation.invokeJoinpoint(CglibAopProxy.java:698) at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:150) at org.springframework.aop.interceptor.AsyncExecutionInterceptor$1.call(AsyncExecutionInterceptor.java:95) at java.util.concurrent.FutureTask.run(FutureTask.java:262) at java.lang.Thread.run(Thread.java:744) {code}

    Spring JIRA | 3 years ago | Björn Voß
    java.lang.NullPointerException
  2. 0

    The cache seems not to be able to handle heavy load during its warmup phase. We use 42 threads in parallel in performance test scenario (a lot of database operations in each thread) and got the NPE in one of five runs. Using a ConcurrentHashMap solves the problem. {code} java.lang.NullPointerException at org.springframework.data.mongodb.core.convert.CustomConversions.getCustomReadTarget(CustomConversions.java:329) at org.springframework.data.mongodb.core.convert.CustomConversions.hasCustomReadTarget(CustomConversions.java:283) at org.springframework.data.mongodb.core.convert.MappingMongoConverter.read(MappingMongoConverter.java:200) at org.springframework.data.mongodb.core.convert.MappingMongoConverter.read(MappingMongoConverter.java:187) at org.springframework.data.mongodb.core.convert.MappingMongoConverter.read(MappingMongoConverter.java:183) at org.springframework.data.mongodb.core.convert.MappingMongoConverter.read(MappingMongoConverter.java:77) at org.springframework.data.mongodb.core.MongoTemplate$ReadDbObjectCallback.doWith(MongoTemplate.java:1975) at org.springframework.data.mongodb.core.MongoTemplate.executeFindOneInternal(MongoTemplate.java:1626) at org.springframework.data.mongodb.core.MongoTemplate.doFindOne(MongoTemplate.java:1446) at org.springframework.data.mongodb.core.MongoTemplate.findById(MongoTemplate.java:539) at org.springframework.data.mongodb.repository.support.SimpleMongoRepository.findOne(SimpleMongoRepository.java:100) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:606) at org.springframework.data.repository.core.support.RepositoryFactorySupport$QueryExecutorMethodInterceptor.executeMethodOn(RepositoryFactorySupport.java:358) at org.springframework.data.repository.core.support.RepositoryFactorySupport$QueryExecutorMethodInterceptor.invoke(RepositoryFactorySupport.java:343) at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:172) at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:204) at com.sun.proxy.$Proxy26.findOne(Unknown Source) at de.is24.offer.mongodb.evaluation.ReadYourOwnDataRightTask.countNumberOfInvalidResults(ReadYourOwnDataRightTask.java:34) at de.is24.offer.mongodb.evaluation.ReadYourOwnDataRightTask$$FastClassByCGLIB$$2b453a69.invoke(<generated>) at org.springframework.cglib.proxy.MethodProxy.invoke(MethodProxy.java:204) at org.springframework.aop.framework.CglibAopProxy$CglibMethodInvocation.invokeJoinpoint(CglibAopProxy.java:698) at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:150) at org.springframework.aop.interceptor.AsyncExecutionInterceptor$1.call(AsyncExecutionInterceptor.java:95) at java.util.concurrent.FutureTask.run(FutureTask.java:262) at java.lang.Thread.run(Thread.java:744) {code}

    Spring JIRA | 3 years ago | Björn Voß
    java.lang.NullPointerException
  3. 0

    Getting a nullpointer exception when switching displayables in J2ME

    Stack Overflow | 6 years ago | Pallinder
    java.lang.NullPointerException: 0 at javax.microedition.lcdui.Display$ChameleonTunnel.callScreenListener(), bci=46 at com.sun.midp.chameleon.layers.SoftButtonLayer.processCommand(), bci=74 at com.sun.midp.chameleon.layers.SoftButtonLayer.soft1(), bci=37 at com.sun.midp.chameleon.layers.SoftButtonLayer.keyInput(), bci=36 at com.sun.midp.chameleon.CWindow.keyInput(), bci=38 at javax.microedition.lcdui.Display$DisplayEventConsumerImpl.handleKeyEvent(), bci=17 at com.sun.midp.lcdui.DisplayEventListener.process(), bci=277 at com.sun.midp.events.EventQueue.run(), bci=179
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  5. 0

    J2ME (Java) - Null Pointer Exception caught in Display Class

    Stack Overflow | 6 years ago | Tom
    java.lang.NullPointerException: 0 at javax.microedition.lcdui.Display$ChameleonTunnel.callScreenListener(), bci=46 at com.sun.midp.chameleon.layers.SoftButtonLayer.processCommand(), bci=74 at com.sun.midp.chameleon.layers.SoftButtonLayer.soft1(), bci=37 at com.sun.midp.chameleon.layers.SoftButtonLayer.keyInput(), bci=36 at com.sun.midp.chameleon.CWindow.keyInput(), bci=38 at javax.microedition.lcdui.Display$DisplayEventConsumerImpl.handleKeyEvent(), bci=17 at com.sun.midp.lcdui.DisplayEventListener.process(), bci=277 at com.sun.midp.events.EventQueue.run(), bci=179
  6. 0

    Cloud Foundry v2 in Grails

    Stack Overflow | 3 years ago | angelo087
    java.lang.NullPointerException: Cannot invoke method getAt() on null object

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    Root Cause Analysis

    1. java.lang.NullPointerException

      No message provided

      at org.springframework.data.mongodb.core.convert.CustomConversions.getCustomReadTarget()
    2. Spring Data MongoDB - Core
      SimpleMongoRepository.findOne
      1. org.springframework.data.mongodb.core.convert.CustomConversions.getCustomReadTarget(CustomConversions.java:329)
      2. org.springframework.data.mongodb.core.convert.CustomConversions.hasCustomReadTarget(CustomConversions.java:283)
      3. org.springframework.data.mongodb.core.convert.MappingMongoConverter.read(MappingMongoConverter.java:200)
      4. org.springframework.data.mongodb.core.convert.MappingMongoConverter.read(MappingMongoConverter.java:187)
      5. org.springframework.data.mongodb.core.convert.MappingMongoConverter.read(MappingMongoConverter.java:183)
      6. org.springframework.data.mongodb.core.convert.MappingMongoConverter.read(MappingMongoConverter.java:77)
      7. org.springframework.data.mongodb.core.MongoTemplate$ReadDbObjectCallback.doWith(MongoTemplate.java:1975)
      8. org.springframework.data.mongodb.core.MongoTemplate.executeFindOneInternal(MongoTemplate.java:1626)
      9. org.springframework.data.mongodb.core.MongoTemplate.doFindOne(MongoTemplate.java:1446)
      10. org.springframework.data.mongodb.core.MongoTemplate.findById(MongoTemplate.java:539)
      11. org.springframework.data.mongodb.repository.support.SimpleMongoRepository.findOne(SimpleMongoRepository.java:100)
      11 frames
    3. Java RT
      Method.invoke
      1. sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
      2. sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
      3. sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
      4. java.lang.reflect.Method.invoke(Method.java:606)
      4 frames
    4. Spring Data Core
      RepositoryFactorySupport$QueryExecutorMethodInterceptor.invoke
      1. org.springframework.data.repository.core.support.RepositoryFactorySupport$QueryExecutorMethodInterceptor.executeMethodOn(RepositoryFactorySupport.java:358)
      2. org.springframework.data.repository.core.support.RepositoryFactorySupport$QueryExecutorMethodInterceptor.invoke(RepositoryFactorySupport.java:343)
      2 frames
    5. Spring AOP
      JdkDynamicAopProxy.invoke
      1. org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:172)
      2. org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:204)
      2 frames
    6. com.sun.proxy
      $Proxy26.findOne
      1. com.sun.proxy.$Proxy26.findOne(Unknown Source)
      1 frame
    7. de.is24.offer
      ReadYourOwnDataRightTask$$FastClassByCGLIB$$2b453a69.invoke
      1. de.is24.offer.mongodb.evaluation.ReadYourOwnDataRightTask.countNumberOfInvalidResults(ReadYourOwnDataRightTask.java:34)
      2. de.is24.offer.mongodb.evaluation.ReadYourOwnDataRightTask$$FastClassByCGLIB$$2b453a69.invoke(<generated>)
      2 frames
    8. Spring Core
      MethodProxy.invoke
      1. org.springframework.cglib.proxy.MethodProxy.invoke(MethodProxy.java:204)
      1 frame
    9. Spring AOP
      AsyncExecutionInterceptor$1.call
      1. org.springframework.aop.framework.CglibAopProxy$CglibMethodInvocation.invokeJoinpoint(CglibAopProxy.java:698)
      2. org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:150)
      3. org.springframework.aop.interceptor.AsyncExecutionInterceptor$1.call(AsyncExecutionInterceptor.java:95)
      3 frames
    10. Java RT
      Thread.run
      1. java.util.concurrent.FutureTask.run(FutureTask.java:262)
      2. java.lang.Thread.run(Thread.java:744)
      2 frames