java.lang.NullPointerException

Spring JIRA | Hemant | 4 years ago
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  1. 0

    Hi, I was using spring data with neo4j. I used {{@Query}} annotation to place the query in the repository,the query was as follows {CODE} @Query(value = "START me=node({0}), friend=node({1}) " + "MATCH p=shortestPath(me-[:ACTIVEFRIEND*..]->friend)" + " RETURN p") public Iterable<EntityPath<User, User>> getShortestPathBetween(User a, User b); {CODE} In Controller I am accesing it as {CODE} Iterable<EntityPath<User, User>> shortestPathBetween = this.queryService.getShortestPathBetween(user, friend); for (EntityPath<User, User> path : shortestPathBetween) { Iterator<User> iter = path.<User>nodeEntities().iterator(); } {CODE} When it tries to access path.nodeEntities ..It is giving the following error... {CODE} nested exception is java.lang.NullPointerException] with root cause java.lang.NullPointerException at org.springframework.data.neo4j.support.path.ConvertingEntityPath.nodes(ConvertingEntityPath.java:137) at org.springframework.data.neo4j.support.path.ConvertingEntityPath.nodeEntities(ConvertingEntityPath.java:69) at com.laindain.cms.controller.QueryController.getShortestPathBetween(QueryController.java:194) 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:601) at org.springframework.web.method.support.InvocableHandlerMethod.invoke(InvocableHandlerMethod.java:212) at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:126) at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:96) at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod(RequestMappingHandlerAdapter.java:617) at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:578) at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:80) at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:900) at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:827) at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:882) at org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:789) at javax.servlet.http.HttpServlet.service(HttpServlet.java:647) at javax.servlet.http.HttpServlet.service(HttpServlet.java:728) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:305) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210) at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:222) at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:123) at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:472) at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:171) at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:99) at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:936) at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118) at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:407) at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1004) at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:589) at org.apache.tomcat.util.net.AprEndpoint$SocketProcessor.run(AprEndpoint.java:1822) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1110) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:603) at java.lang.Thread.run(Thread.java:722) {CODE}

    Spring JIRA | 4 years ago | Hemant
    java.lang.NullPointerException
  2. 0

    Hi, I was using spring data with neo4j. I used {{@Query}} annotation to place the query in the repository,the query was as follows {CODE} @Query(value = "START me=node({0}), friend=node({1}) " + "MATCH p=shortestPath(me-[:ACTIVEFRIEND*..]->friend)" + " RETURN p") public Iterable<EntityPath<User, User>> getShortestPathBetween(User a, User b); {CODE} In Controller I am accesing it as {CODE} Iterable<EntityPath<User, User>> shortestPathBetween = this.queryService.getShortestPathBetween(user, friend); for (EntityPath<User, User> path : shortestPathBetween) { Iterator<User> iter = path.<User>nodeEntities().iterator(); } {CODE} When it tries to access path.nodeEntities ..It is giving the following error... {CODE} nested exception is java.lang.NullPointerException] with root cause java.lang.NullPointerException at org.springframework.data.neo4j.support.path.ConvertingEntityPath.nodes(ConvertingEntityPath.java:137) at org.springframework.data.neo4j.support.path.ConvertingEntityPath.nodeEntities(ConvertingEntityPath.java:69) at com.laindain.cms.controller.QueryController.getShortestPathBetween(QueryController.java:194) 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:601) at org.springframework.web.method.support.InvocableHandlerMethod.invoke(InvocableHandlerMethod.java:212) at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:126) at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:96) at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod(RequestMappingHandlerAdapter.java:617) at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:578) at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:80) at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:900) at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:827) at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:882) at org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:789) at javax.servlet.http.HttpServlet.service(HttpServlet.java:647) at javax.servlet.http.HttpServlet.service(HttpServlet.java:728) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:305) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210) at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:222) at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:123) at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:472) at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:171) at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:99) at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:936) at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118) at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:407) at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1004) at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:589) at org.apache.tomcat.util.net.AprEndpoint$SocketProcessor.run(AprEndpoint.java:1822) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1110) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:603) at java.lang.Thread.run(Thread.java:722) {CODE}

    Spring JIRA | 4 years ago | Hemant
    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.neo4j.support.path.ConvertingEntityPath.nodes()
    2. Spring Data Neo4j
      ConvertingEntityPath.nodeEntities
      1. org.springframework.data.neo4j.support.path.ConvertingEntityPath.nodes(ConvertingEntityPath.java:137)
      2. org.springframework.data.neo4j.support.path.ConvertingEntityPath.nodeEntities(ConvertingEntityPath.java:69)
      2 frames
    3. com.laindain.cms
      QueryController.getShortestPathBetween
      1. com.laindain.cms.controller.QueryController.getShortestPathBetween(QueryController.java:194)
      1 frame
    4. 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:601)
      4 frames
    5. Spring
      InvocableHandlerMethod.invokeForRequest
      1. org.springframework.web.method.support.InvocableHandlerMethod.invoke(InvocableHandlerMethod.java:212)
      2. org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:126)
      2 frames
    6. Spring MVC
      FrameworkServlet.doPost
      1. org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:96)
      2. org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod(RequestMappingHandlerAdapter.java:617)
      3. org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:578)
      4. org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:80)
      5. org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:900)
      6. org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:827)
      7. org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:882)
      8. org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:789)
      8 frames
    7. JavaServlet
      HttpServlet.service
      1. javax.servlet.http.HttpServlet.service(HttpServlet.java:647)
      2. javax.servlet.http.HttpServlet.service(HttpServlet.java:728)
      2 frames
    8. Glassfish Core
      CoyoteAdapter.service
      1. org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:305)
      2. org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
      3. org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:222)
      4. org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:123)
      5. org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:472)
      6. org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:171)
      7. org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:99)
      8. org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:936)
      9. org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118)
      10. org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:407)
      10 frames
    9. Grizzly HTTP
      AprEndpoint$SocketProcessor.run
      1. org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1004)
      2. org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:589)
      3. org.apache.tomcat.util.net.AprEndpoint$SocketProcessor.run(AprEndpoint.java:1822)
      3 frames
    10. Java RT
      Thread.run
      1. java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1110)
      2. java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:603)
      3. java.lang.Thread.run(Thread.java:722)
      3 frames