AccessControlException when using Embedded Neo4j in GWT

[Corey Wu]

Hi,

Anyone have experience with using embedded Neo4j in GWT? I get an AccessControlException when I try to create the embedded database.

Here's the line I use to create my database in my ServiceImpl file:

GraphDatabaseService graphDb = new GraphDatabaseFactory().newEmbeddedDatabase("/var/uwcompanygraph");

Here's the stacktrace:

SEVERE: javax.servlet.ServletContext log: Exception while dispatching incoming RPC call

    com.google.gwt.user.server.rpc.UnexpectedException: Service method 'public abstract com.coreywu.uwcompanygraph.client.CompanyGraph com.coreywu.uwcompanygraph.client.QueryGraphService.getGraph()' threw an unexpected exception: java.security.AccessControlException: access denied ("java.io.FilePermission" "\var\uwcompanygraph" "read")

    at com.google.gwt.user.server.rpc.RPC.encodeResponseForFailure(RPC.java:389)

    at com.google.gwt.user.server.rpc.RPC.invokeAndEncodeResponse(RPC.java:579)

    at com.google.gwt.user.server.rpc.RemoteServiceServlet.processCall(RemoteServiceServlet.java:265)

    at com.google.gwt.user.server.rpc.RemoteServiceServlet.processPost(RemoteServiceServlet.java:305)

    at com.google.gwt.user.server.rpc.AbstractRemoteServiceServlet.doPost(AbstractRemoteServiceServlet.java:62)

    at javax.servlet.http.HttpServlet.service(HttpServlet.java:637)

    at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)

    at org.mortbay.jetty.servlet.ServletHolder.handle(ServletHolder.java:511)

    at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1166)

    at com.google.appengine.api.socket.dev.DevSocketFilter.doFilter(DevSocketFilter.java:74)

    at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)

    at com.google.appengine.tools.development.ResponseRewriterFilter.doFilter(ResponseRewriterFilter.java:127)

    at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)

    at com.google.appengine.tools.development.HeaderVerificationFilter.doFilter(HeaderVerificationFilter.java:34)

    at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)

    at com.google.appengine.api.blobstore.dev.ServeBlobFilter.doFilter(ServeBlobFilter.java:63)

    at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)

    at com.google.apphosting.utils.servlet.TransactionCleanupFilter.doFilter(TransactionCleanupFilter.java:43)

    at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)

    at com.google.appengine.tools.development.StaticFileFilter.doFilter(StaticFileFilter.java:125)

    at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)

    at com.google.appengine.tools.development.DevAppServerModulesFilter.doDirectRequest(DevAppServerModulesFilter.java:366)

    at com.google.appengine.tools.development.DevAppServerModulesFilter.doDirectModuleRequest(DevAppServerModulesFilter.java:349)

    at com.google.appengine.tools.development.DevAppServerModulesFilter.doFilter(DevAppServerModulesFilter.java:116)

    at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)

    at org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.java:388)

    at org.mortbay.jetty.security.SecurityHandler.handle(SecurityHandler.java:216)

    at org.mortbay.jetty.servlet.SessionHandler.handle(SessionHandler.java:182)

    at org.mortbay.jetty.handler.ContextHandler.handle(ContextHandler.java:765)

    at org.mortbay.jetty.webapp.WebAppContext.handle(WebAppContext.java:418)

    at com.google.appengine.tools.development.DevAppEngineWebAppContext.handle(DevAppEngineWebAppContext.java:98)

    at org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:152)

    at com.google.appengine.tools.development.JettyContainerService$ApiProxyHandler.handle(JettyContainerService.java:491)

    at org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:152)

    at org.mortbay.jetty.Server.handle(Server.java:326)

    at org.mortbay.jetty.HttpConnection.handleRequest(HttpConnection.java:542)

    at org.mortbay.jetty.HttpConnection$RequestHandler.content(HttpConnection.java:938)

    at org.mortbay.jetty.HttpParser.parseNext(HttpParser.java:755)

    at org.mortbay.jetty.HttpParser.parseAvailable(HttpParser.java:218)

    at org.mortbay.jetty.HttpConnection.handle(HttpConnection.java:404)

    at org.mortbay.io.nio.SelectChannelEndPoint.run(SelectChannelEndPoint.java:409)

    at org.mortbay.thread.QueuedThreadPool$PoolThread.run(QueuedThreadPool.java:582)

    Caused by: java.security.AccessControlException: access denied ("java.io.FilePermission" "\var\uwcompanygraph" "read")

    at java.security.AccessControlContext.checkPermission(AccessControlContext.java:372)

    at java.security.AccessController.checkPermission(AccessController.java:559)

    at java.lang.SecurityManager.checkPermission(SecurityManager.java:549)

    at com.google.appengine.tools.development.DevAppServerFactory$CustomSecurityManager.checkPermission(DevAppServerFactory.java:429)

    at java.lang.SecurityManager.checkRead(SecurityManager.java:888)

    at java.io.File.exists(File.java:808)

    at org.neo4j.kernel.DefaultFileSystemAbstraction.mkdirs(DefaultFileSystemAbstraction.java:111)

    at org.neo4j.kernel.impl.util.StringLogger$ActualStringLogger.<init>(StringLogger.java:582)

    at org.neo4j.kernel.impl.util.StringLogger$ActualStringLogger.<init>(StringLogger.java:560)

    at org.neo4j.kernel.impl.util.StringLogger.loggerDirectory(StringLogger.java:109)

    at org.neo4j.kernel.logging.ClassicLoggingService.<init>(ClassicLoggingService.java:41)

    at org.neo4j.kernel.logging.ClassicLoggingService.<init>(ClassicLoggingService.java:36)

    at org.neo4j.kernel.logging.LogbackWeakDependency$1.apply(LogbackWeakDependency.java:41)

    at org.neo4j.kernel.logging.LogbackWeakDependency$1.apply(LogbackWeakDependency.java:37)

    at org.neo4j.kernel.logging.LogbackWeakDependency.tryLoadLogbackService(LogbackWeakDependency.java:98)

    at org.neo4j.kernel.logging.LogbackWeakDependency.tryLoadLogbackService(LogbackWeakDependency.java:103)

    at org.neo4j.kernel.logging.DefaultLogging.createDefaultLogging(DefaultLogging.java:42)

    at org.neo4j.kernel.InternalAbstractGraphDatabase.createLogging(InternalAbstractGraphDatabase.java:979)

    at org.neo4j.kernel.InternalAbstractGraphDatabase.create(InternalAbstractGraphDatabase.java:442)

    at org.neo4j.kernel.InternalAbstractGraphDatabase.run(InternalAbstractGraphDatabase.java:336)

    at org.neo4j.kernel.EmbeddedGraphDatabase.<init>(EmbeddedGraphDatabase.java:59)

    at org.neo4j.graphdb.factory.GraphDatabaseFactory$1.newDatabase(GraphDatabaseFactory.java:91)

    at org.neo4j.graphdb.factory.GraphDatabaseBuilder.newGraphDatabase(GraphDatabaseBuilder.java:181)

    at org.neo4j.graphdb.factory.GraphDatabaseFactory.newEmbeddedDatabase(GraphDatabaseFactory.java:71)

    at com.coreywu.uwcompanygraph.server.QueryGraphServiceImpl.getGraph(QueryGraphServiceImpl.java:26)

    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 com.google.appengine.tools.development.agent.runtime.Runtime.invoke(Runtime.java:115)

    at com.google.gwt.user.server.rpc.RPC.invokeAndEncodeResponse(RPC.java:561)

    ... 40 more

Any help would be greatly appreciated!

[Michael Hunger]

Sounds like a simple file system permission issue, make sure the user which runs your GWT app has read and write permissions on: \var\uwcompanygraph

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