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java.lang.NullPointerException: 	at jp.aegif.nemaki.service.node.impl.ContentServiceImpl.getContentByPath(ContentServiceImpl.java:147)	at sun.reflect.GeneratedMethodAccessor209.invoke(Unknown Source)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)	at java.lang.reflect.Method.invoke(Method.java:597)	at org.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:318)	at org.springframework.aop.framework.ReflectiveMethodInvocation.invokeJoinpoint(ReflectiveMethodInvocation.java:183)	at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:150)	at org.springframework.aop.framework.adapter.AfterReturningAdviceInterceptor.invoke(AfterReturningAdviceInterceptor.java:50)	at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:172)	at org.springframework.aop.framework.adapter.MethodBeforeAdviceInterceptor.invoke(MethodBeforeAdviceInterceptor.java:50)	at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:172)	at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:202)	at $Proxy20.getContentByPath(Unknown Source)	at jp.aegif.nemaki.service.cmis.impl.ObjectServiceImpl.getObjectByPath(ObjectServiceImpl.java:97)	at sun.reflect.GeneratedMethodAccessor208.invoke(Unknown Source)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)	at java.lang.reflect.Method.invoke(Method.java:597)	at org.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:318)	at org.springframework.aop.framework.ReflectiveMethodInvocation.invokeJoinpoint(ReflectiveMethodInvocation.java:183)	at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:150)	at org.springframework.aop.framework.adapter.AfterReturningAdviceInterceptor.invoke(AfterReturningAdviceInterceptor.java:50)	at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:172)	at org.springframework.aop.framework.adapter.MethodBeforeAdviceInterceptor.invoke(MethodBeforeAdviceInterceptor.java:50)	at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:172)	at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:202)	at $Proxy31.getObjectByPath(Unknown Source)	at jp.aegif.nemaki.repository.NemakiRepository.getObjectByPath(NemakiRepository.java:146)	at jp.aegif.nemaki.service.cmis.NemakiCmisService.getObjectByPath(NemakiCmisService.java:328)	at org.apache.chemistry.opencmis.server.support.CmisServiceWrapper.getObjectByPath(CmisServiceWrapper.java:905)	at org.apache.chemistry.opencmis.server.impl.atompub.ObjectService.getObjectByPath(ObjectService.java:347)	at sun.reflect.GeneratedMethodAccessor207.invoke(Unknown Source)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)	at java.lang.reflect.Method.invoke(Method.java:597)	at org.apache.chemistry.opencmis.server.shared.Dispatcher.dispatch(Dispatcher.java:94)	at org.apache.chemistry.opencmis.server.impl.atompub.CmisAtomPubServlet.dispatch(CmisAtomPubServlet.java:263)	at org.apache.chemistry.opencmis.server.impl.atompub.CmisAtomPubServlet.service(CmisAtomPubServlet.java:212)	at javax.servlet.http.HttpServlet.service(HttpServlet.java:820)	at org.eclipse.jetty.servlet.ServletHolder.handle(ServletHolder.java:530)	at org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:427)	at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:119)	at org.eclipse.jetty.security.SecurityHandler.handle(SecurityHandler.java:494)	at org.eclipse.jetty.server.session.SessionHandler.handle(SessionHandler.java:182)	at org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:933)	at org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:362)	at org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:867)	at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:117)	at org.eclipse.jetty.server.handler.ContextHandlerCollection.handle(ContextHandlerCollection.java:245)	at org.eclipse.jetty.server.handler.HandlerCollection.handle(HandlerCollection.java:126)	at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:113)	at org.eclipse.jetty.server.Server.handle(Server.java:334)	at org.eclipse.jetty.server.HttpConnection.handleRequest(HttpConnection.java:559)	at org.eclipse.jetty.server.HttpConnection$RequestHandler.headerComplete(HttpConnection.java:992)	at org.eclipse.jetty.http.HttpParser.parseNext(HttpParser.java:541)	at org.eclipse.jetty.http.HttpParser.parseAvailable(HttpParser.java:203)	at org.eclipse.jetty.server.HttpConnection.handle(HttpConnection.java:406)	at org.eclipse.jetty.io.nio.SelectChannelEndPoint.run(SelectChannelEndPoint.java:462)	at org.eclipse.jetty.util.thread.QueuedThreadPool$2.run(QueuedThreadPool.java:436)	at java.lang.Thread.run(Thread.java:619)