Migrate unmanaged extentions to Neo4J 3.0

[Artur W]

Hi,

I try to migrate my unmaneged extention from  Neo4j 2.3.2 (Comunity Edition)  to Neo4J 3.0 (CE) . So I updated the Neo4j version in my pom.xml file and rebuild the plugin.

After that I copied it into the plugin directory and edited the neo4j.conf as following:

dbms.unmanaged_extension_classes=package.path.to.my.resource=/graph/

When I try to start neo4j I get the following stacktracke:

2016-04-26 12:52:54.297+0000 INFO  Starting...

2016-04-26 12:52:54.784+0000 INFO  Bolt enabled on localhost:7687.

2016-04-26 12:52:56.589+0000 ERROR Failed to start Neo4j: Starting Neo4j failed: Component 'org.neo4j.server.database.LifecycleManagingDatabase@5384a166' was successfully initialized, but failed to start. Please see attached cause exception. Starting Neo4j failed: Component 'org.neo4j.server.database.LifecycleManagingDatabase@5384a166' was successfully initialized, but failed to start. Please see attached cause exception.

org.neo4j.server.ServerStartupException: Starting Neo4j failed: Component 'org.neo4j.server.database.LifecycleManagingDatabase@5384a166' was successfully initialized, but failed to start. Please see attached cause exception.

at org.neo4j.server.exception.ServerStartupErrors.translateToServerStartupError(ServerStartupErrors.java:68)

at org.neo4j.server.AbstractNeoServer.start(AbstractNeoServer.java:217)

at org.neo4j.server.ServerBootstrapper.start(ServerBootstrapper.java:81)

at org.neo4j.server.ServerBootstrapper.start(ServerBootstrapper.java:60)

at org.neo4j.server.CommunityEntryPoint.main(CommunityEntryPoint.java:28)

Caused by: org.neo4j.kernel.lifecycle.LifecycleException: Component 'org.neo4j.server.database.LifecycleManagingDatabase@5384a166' was successfully initialized, but failed to start. Please see attached cause exception.

at org.neo4j.kernel.lifecycle.LifeSupport$LifecycleInstance.start(LifeSupport.java:444)

at org.neo4j.kernel.lifecycle.LifeSupport.start(LifeSupport.java:107)

at org.neo4j.server.AbstractNeoServer.start(AbstractNeoServer.java:189)

... 3 more

Caused by: java.lang.RuntimeException: Error starting org.neo4j.kernel.impl.factory.CommunityFacadeFactory, /home/artur/apps/neo4j-community-3.0.0/data/databases/graph.db

at org.neo4j.kernel.impl.factory.GraphDatabaseFacadeFactory.newFacade(GraphDatabaseFacadeFactory.java:144)

at org.neo4j.kernel.impl.factory.CommunityFacadeFactory.newFacade(CommunityFacadeFactory.java:40)

at org.neo4j.kernel.impl.factory.GraphDatabaseFacadeFactory.newFacade(GraphDatabaseFacadeFactory.java:108)

at org.neo4j.server.CommunityNeoServer.lambda$static$32(CommunityNeoServer.java:55)

at org.neo4j.server.CommunityNeoServer$$Lambda$43/1393931310.newGraphDatabase(Unknown Source)

at org.neo4j.server.database.LifecycleManagingDatabase.start(LifecycleManagingDatabase.java:89)

at org.neo4j.kernel.lifecycle.LifeSupport$LifecycleInstance.start(LifeSupport.java:434)

... 5 more

Caused by: org.neo4j.kernel.lifecycle.LifecycleException: Component 'org.neo4j.kernel.impl.proc.Procedures@4e6bcab1' was successfully initialized, but failed to start. Please see attached cause exception.

at org.neo4j.kernel.lifecycle.LifeSupport$LifecycleInstance.start(LifeSupport.java:444)

at org.neo4j.kernel.lifecycle.LifeSupport.start(LifeSupport.java:107)

at org.neo4j.kernel.impl.factory.GraphDatabaseFacadeFactory.newFacade(GraphDatabaseFacadeFactory.java:140)

... 11 more

Caused by: org.neo4j.kernel.api.exceptions.ProcedureException: Procedures must return a Stream of records, where a record is a concrete class

that you define and not a Stream<?>.

at org.neo4j.kernel.impl.proc.OutputMappers.mapper(OutputMappers.java:162)

at org.neo4j.kernel.impl.proc.ReflectiveProcedureCompiler.compileProcedure(ReflectiveProcedureCompiler.java:106)

at org.neo4j.kernel.impl.proc.ReflectiveProcedureCompiler.compile(ReflectiveProcedureCompiler.java:84)

at org.neo4j.kernel.impl.proc.ProcedureJarLoader.loadProcedures(ProcedureJarLoader.java:88)

at org.neo4j.kernel.impl.proc.ProcedureJarLoader.loadProceduresFromDir(ProcedureJarLoader.java:77)

at org.neo4j.kernel.impl.proc.Procedures.start(Procedures.java:125)

at org.neo4j.kernel.lifecycle.LifeSupport$LifecycleInstance.start(LifeSupport.java:434)

... 13 more

Using the same in 2.3.2 via org.neo4j.server.thirdparty_jaxrs_classes=package.path.to.my.resources=/graph in neo4j-server.properties works fine.

Thanks.

Regards Artur.

[Sotiris Beis]

Any update on this issue? I have the exact same problem.

Cheers,

Sotiris

[Max De Marzi Jr.]

I did one of mine recently, it was pretty painless. See:

https://github.com/maxdemarzi/graph_processing/commit/0f8c632a13d106d562ebfd9c7b7ce2051012c46c

Are you trying to go from Extension to Procedure or keeping it an extension? Got code up anywhere we can take a look?

[Sotiris Beis]

I am going from extension to extension. The only thing that I had to change in the code was the neo4j version in the pom file.