Abfrage Cypher auf Tomcat ausführen, Fehler mit Scala-Bibliothek

Question

Ich bin dran, eine Abfrage mit Cypher in einer Web-App (REST) ​​mit Tomcat auszuführen. Dieser Code funktioniert einwandfrei in einer normalen Java-Anwendung, aber wenn ich es auf dem Web-App mit tomcat laufen gibt es diesen Fehler:

java.lang.NoClassDefFoundError: scala/ScalaObject 

, wenn ich eine scala-library.jar in Projekt hinzufügen, wenn ich auf tomcat bereitstellen es gibt einen Fehler "OutOfMemory" zurück. Wenn ich im Internet suche, habe ich meine JAVA_OPTS von 512M auf 2048M erhöht, aber nichts.

Dies ist mein Code meine Abfrage auszuführen:

ExecutionEngine engine = new ExecutionEngine(graphDb); 
ExecutionResult result = engine.execute(query); 

Es sieht aus wie die ExecuteEngine Verwendung von Scala Bibliothek und diese Bibliothek Konflikte mit Kater macht. Irgendwelche Vorschläge?

EDIT:

(full-Stack OOME)

16-apr-2012 16.25.10 org.apache.catalina.core.ContainerBase startInternal 
GRAVE: A child container failed during start 
java.util.concurrent.ExecutionException: java.lang.OutOfMemoryError: Java heap space 
    at java.util.concurrent.FutureTask$Sync.innerGet(FutureTask.java:222) 
    at java.util.concurrent.FutureTask.get(FutureTask.java:83) 
    at org.apache.catalina.core.ContainerBase.startInternal(ContainerBase.java:1128) 
    at org.apache.catalina.core.StandardHost.startInternal(StandardHost.java:782) 
    at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150) 
    at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1566) 
    at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1556) 
    at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:303) 
    at java.util.concurrent.FutureTask.run(FutureTask.java:138) 
    at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886) 
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908) 
    at java.lang.Thread.run(Thread.java:680) 
    Caused by: java.lang.OutOfMemoryError: Java heap space 
    at java.util.Arrays.copyOfRange(Arrays.java:3209) 
    at java.lang.String.<init>(String.java:215) 
    at java.io.DataInputStream.readUTF(DataInputStream.java:644) 
    at java.io.DataInputStream.readUTF(DataInputStream.java:547) 
    at org.apache.tomcat.util.bcel.classfile.ConstantUtf8.<init>(ConstantUtf8.java:48) 
    at org.apache.tomcat.util.bcel.classfile.Constant.readConstant(Constant.java:129) 
    at org.apache.tomcat.util.bcel.classfile.ConstantPool.<init>(ConstantPool.java:60) 
    at org.apache.tomcat.util.bcel.classfile.ClassParser.readConstantPool(ClassParser.java:209) 
    at org.apache.tomcat.util.bcel.classfile.ClassParser.parse(ClassParser.java:119) 
    at org.apache.catalina.startup.ContextConfig.populateJavaClassCache(ContextConfig.java:2156) 
    at org.apache.catalina.startup.ContextConfig.populateJavaClassCache(ContextConfig.java:2139) 
    at org.apache.catalina.startup.ContextConfig.checkHandlesTypes(ContextConfig.java:2077) 
    at org.apache.catalina.startup.ContextConfig.processAnnotationsStream(ContextConfig.java:2034) 
    at org.apache.catalina.startup.ContextConfig.processAnnotationsJar(ContextConfig.java:1923) 
    at org.apache.catalina.startup.ContextConfig.processAnnotationsUrl(ContextConfig.java:1891) 
    at org.apache.catalina.startup.ContextConfig.processAnnotations(ContextConfig.java:1877) 
    at org.apache.catalina.startup.ContextConfig.webConfig(ContextConfig.java:1270) 
    at org.apache.catalina.startup.ContextConfig.configureStart(ContextConfig.java:855) 
    at org.apache.catalina.startup.ContextConfig.lifecycleEvent(ContextConfig.java:345) 
    at org.apache.catalina.util.LifecycleSupport.fireLifecycleEvent(LifecycleSupport.java:119) 
    at org.apache.catalina.util.LifecycleBase.fireLifecycleEvent(LifecycleBase.java:90) 
    at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5161) 
    ... 8 more 
16-apr-2012 16.25.11 org.apache.catalina.core.ContainerBase startInternal 
GRAVE: A child container failed during start 
java.util.concurrent.ExecutionException: org.apache.catalina.LifecycleException: Failed to start component [StandardEngine[Catalina].StandardHost[localhost]] 
    at java.util.concurrent.FutureTask$Sync.innerGet(FutureTask.java:222) 
    at java.util.concurrent.FutureTask.get(FutureTask.java:83) 
    at org.apache.catalina.core.ContainerBase.startInternal(ContainerBase.java:1128) 
    at org.apache.catalina.core.StandardEngine.startInternal(StandardEngine.java:302) 
    at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150) 
    at org.apache.catalina.core.StandardService.startInternal(StandardService.java:443) 
    at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150) 
    at org.apache.catalina.core.StandardServer.startInternal(StandardServer.java:732) 
    at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150) 
    at org.apache.catalina.startup.Catalina.start(Catalina.java:675) 
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) 
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39) 
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) 
    at java.lang.reflect.Method.invoke(Method.java:597) 
    at org.apache.catalina.startup.Bootstrap.start(Bootstrap.java:322) 
    at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:450) 
Caused by: org.apache.catalina.LifecycleException: Failed to start component [StandardEngine[Catalina].StandardHost[localhost]] 
    at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:154) 
    at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1566) 
    at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1556) 
    at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:303) 
    at java.util.concurrent.FutureTask.run(FutureTask.java:138) 
    at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886) 
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908) 
    at java.lang.Thread.run(Thread.java:680) 
Caused by: org.apache.catalina.LifecycleException: A child container failed during start 
    at org.apache.catalina.core.ContainerBase.startInternal(ContainerBase.java:1136) 
    at org.apache.catalina.core.StandardHost.startInternal(StandardHost.java:782) 
    at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150) 
    ... 7 more 
16-apr-2012 16.25.11 org.apache.catalina.startup.Catalina start 
GRAVE: Catalina.start: 
org.apache.catalina.LifecycleException: Failed to start component [StandardServer[8005]] 
    at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:154) 
    at org.apache.catalina.startup.Catalina.start(Catalina.java:675) 
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) 
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39) 
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) 
    at java.lang.reflect.Method.invoke(Method.java:597) 
    at org.apache.catalina.startup.Bootstrap.start(Bootstrap.java:322) 
    at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:450) 
Caused by: org.apache.catalina.LifecycleException: Failed to start component [StandardService[Catalina]] 
    at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:154) 
    at org.apache.catalina.core.StandardServer.startInternal(StandardServer.java:732) 
    at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150) 
    ... 7 more 
Caused by: org.apache.catalina.LifecycleException: Failed to start component [StandardEngine[Catalina]] 
    at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:154) 
    at org.apache.catalina.core.StandardService.startInternal(StandardService.java:443) 
    at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150) 
    ... 9 more 
Caused by: org.apache.catalina.LifecycleException: A child container failed during start 
    at org.apache.catalina.core.ContainerBase.startInternal(ContainerBase.java:1136) 
    at org.apache.catalina.core.StandardEngine.startInternal(StandardEngine.java:302) 
    at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150) 
    ... 11 more 
16-apr-2012 16.25.11 org.apache.catalina.startup.Catalina start 
INFO: Server startup in 13147 ms 

Answer 1

Die NoClassDefFound ist aufgrund der fehlenden Scala Bibliothek hinzugefügt, es so zu web-inf/lib korrekt ist. Wenn Sie dem Klassenpfad eine Bibliothek hinzufügen, führt dies jedoch nicht zu Fehlern bei der Speicherauslastung. Daher scheint es sich um Ihre App zu handeln.

Was ist die Klasse ExecutionEngine? Was ist der Stacktrace (obwohl das nicht unbedingt helfen wird). Sind Sie sicher, dass Ihre Webanwendung dasselbe tut wie Ihre Java App, die keine Probleme hat? Wie testen Sie Ihre Webapp? Könnte es einfach sein, dass viele gleichzeitige Threads (Anfragen) das OOME verursachen, aber ein Thread funktioniert gut (wie die Plain-Java-App)?