Hi,
When I am trying to embed a neo4j database in my java application. I have a
neo4j database and verified it by running it on neo4j server. But I am
having problems in using it in my java application. While debugging I
observed that the debugger goes to line 79 of
class LuceneIndexImplementation inside init() method
this.dataSource = new LuceneDataSource ( storeDir, config,
indexStore.get(), fileSystemAbstraction, operationalMode );
and then I could step into it and it directly goes to line 98 of same class
inside shutdown() method
this.dataSource.shutdown();
the value of dataSource object at this point is null.
Below is the code I have used in my java application followed by the error
stack trace.
GraphDatabaseService graphDb = new
GraphDatabaseFactory().newEmbeddedDatabaseBuilder("Path of neo4j
db").newGraphDatabase();
java.lang.RuntimeException: Error starting
org.neo4j.kernel.impl.factory.GraphDatabaseFacadeFactory,
/Users/carora/Documents/graph.db
at
org.neo4j.kernel.impl.factory.GraphDatabaseFacadeFactory.initFacade(GraphDatabaseFacadeFactory.java:211)
at
org.neo4j.kernel.impl.factory.GraphDatabaseFacadeFactory.newFacade(GraphDatabaseFacadeFactory.java:126)
at
org.neo4j.graphdb.factory.GraphDatabaseFactory.newDatabase(GraphDatabaseFactory.java:137)
at
org.neo4j.graphdb.factory.GraphDatabaseFactory.newEmbeddedDatabase(GraphDatabaseFactory.java:130)
at
org.neo4j.graphdb.factory.GraphDatabaseFactory$1.newDatabase(GraphDatabaseFactory.java:107)
at
org.neo4j.graphdb.factory.GraphDatabaseBuilder.newGraphDatabase(GraphDatabaseBuilder.java:193)
at
org.apache.ctakes.rest.service.CtakesRestController.getNeo4jDatabase(CtakesRestController.java:265)
at
org.apache.ctakes.rest.service.CtakesRestController.getRecommendation(CtakesRestController.java:247)
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:498)
at
org.springframework.web.method.support.InvocableHandlerMethod.doInvoke(InvocableHandlerMethod.java:205)
at
org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:133)
at
org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:97)
at
org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod(RequestMappingHandlerAdapter.java:827)
at
org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:738)
at
org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:85)
at
org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:967)
at
org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:901)
at
org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:970)
at
org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:872)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:660)
at
org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:846)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:741)
at
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:231)
at
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53)
at
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
at
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
at
org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:199)
at
org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:96)
at
org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:137)
at
org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:81)
at
org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:651)
at
org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:87)
at
org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:342)
at
org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:409)
at
org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:66)
at
org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:754)
at
org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1376)
at
org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49)
at
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
at
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
at
org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
at java.lang.Thread.run(Thread.java:748)
Caused by: org.neo4j.kernel.lifecycle.LifecycleException: Component
'org.neo4j.kernel.lifecycle.Lifecycle$Delegate@3f1d7f15' failed to
initialize. Please see the attached cause exception "Could not initialize
class org.neo4j.index.impl.lucene.explicit.LuceneDataSource".
at
org.neo4j.kernel.lifecycle.LifeSupport$LifecycleInstance.init(LifeSupport.java:427)
at org.neo4j.kernel.lifecycle.LifeSupport.init(LifeSupport.java:62)
at org.neo4j.kernel.lifecycle.LifeSupport.start(LifeSupport.java:98)
at org.neo4j.kernel.NeoStoreDataSource.start(NeoStoreDataSource.java:528)
at
org.neo4j.kernel.lifecycle.LifeSupport$LifecycleInstance.start(LifeSupport.java:445)
at org.neo4j.kernel.lifecycle.LifeSupport.start(LifeSupport.java:107)
at
org.neo4j.kernel.impl.transaction.state.DataSourceManager.start(DataSourceManager.java:100)
at
org.neo4j.kernel.lifecycle.LifeSupport$LifecycleInstance.start(LifeSupport.java:445)
at org.neo4j.kernel.lifecycle.LifeSupport.start(LifeSupport.java:107)
at
org.neo4j.kernel.impl.factory.GraphDatabaseFacadeFactory.initFacade(GraphDatabaseFacadeFactory.java:207)
... 45 more
Caused by: java.lang.NoClassDefFoundError: Could not initialize class
org.neo4j.index.impl.lucene.explicit.LuceneDataSource
at
org.neo4j.index.impl.lucene.explicit.LuceneIndexImplementation.init(LuceneIndexImplementation.java:79)
at
org.neo4j.kernel.lifecycle.Lifecycles$CombinedLifecycle.init(Lifecycles.java:54)
at org.neo4j.kernel.lifecycle.Lifecycle$Delegate.init(Lifecycle.java:64)
at
org.neo4j.kernel.lifecycle.LifeSupport$LifecycleInstance.init(LifeSupport.java:406)
... 54 more
Suppressed: org.neo4j.kernel.lifecycle.LifecycleException: Exception during
graceful attempt to shutdown partially initialized component. Please use
non suppressed exception to see original component failure.
at
org.neo4j.kernel.lifecycle.LifeSupport$LifecycleInstance.init(LifeSupport.java:418)
... 54 more
Caused by: java.lang.NullPointerException
at
org.neo4j.index.impl.lucene.explicit.LuceneIndexImplementation.shutdown(LuceneIndexImplementation.java:98)
at
org.neo4j.kernel.lifecycle.Lifecycles$CombinedLifecycle.shutdown(Lifecycles.java:81)
at org.neo4j.kernel.lifecycle.Lifecycle$Delegate.shutdown(Lifecycle.java:82)
at
org.neo4j.kernel.lifecycle.LifeSupport$LifecycleInstance.init(LifeSupport.java:414)
... 54 more
What could be the reason that for java.lang.NoClassDefFoundError?
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