I am running tomcat7 on ubuntu and have written a servlet program, that executes a simple create nodes function using java embedded APIs, when I call a specific url.
The problem that I face is that often when I call the url, I get a lucene write lock error, check the stack trace here: https://gist.github.com/niranjan-uma-shankar/20e26edaf205c4f97b04 messages.log has this to say: Startup failed: Component 'org.neo4j.kernel.impl.transaction.XaDataSourceManager@71a60d09' was successfully initialized, but failed to start. Please see attached cause exception.: Component 'org.neo4j.kernel.impl.nioneo.xa.NeoStoreXaDataSource@611fd81f' was successfully initialized, but failed to start. Please see attached cause exception.: Component 'org.neo4j.kernel.api.impl.index.LuceneLabelScanStore@4fd5db0b' failed to initialize. Please see attached cause exception.: Lock obtain timed out: NativeFSLock@/var/lib/neo4j-community-2.1.7/data/graph.db/schema/label/lucene/write.lock My guess is that the following line in my code is the root cause of the error: graphDb = new GraphDatabaseFactory().newEmbeddedDatabase( DB_PATH ); Maybe Tomcat doesn't have the appropriate permissions to write to neo4j db path? I noticed that the graph.db directory was getting created with user and group permissions as tomcat7. So, I changed /etc/default/tomcat7 to have the following properties (the default values where tomcat7 for user and group) and restarted tomcat7 process: # Run Tomcat as this user ID. Not setting this or leaving it blank will use the # default of tomcat7. TOMCAT7_USER=ubuntu # Run Tomcat as this group ID. Not setting this or leaving it blank will use # the default of tomcat7. TOMCAT7_GROUP=ubuntu I still don't have luck. Any clues on why the write lock errors are showing up? -- You received this message because you are subscribed to the Google Groups "Neo4j" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. For more options, visit https://groups.google.com/d/optout.
