非托管扩展TransactionEventHandler Neo4j

Question

This is also on https://groups.google.com/forum/#!forum/neo4j

I'm trying to create an unmanaged extension which puts a message on a queue when a node becomes interesting (eg a relationship of a new type is created)

I believe I can do this with a TransactionEventHandler so I have created a class which extends KernelExtensionFactory which has a method (newKernelExtension) which returns a LifeCycle. My LIfeCycleAdapter then registers the TransactionEventHandler in the start method. In my class that implements TransactionEventHandler i have afterCommit, which basically just writes to a text file for the sake of testing.

In conf/neo4j-server.properties I have put the following -

org.neo4j.server.thirdparty_jaxrs_classes=org.neo4j.extensions.events=/db/events

However the server doesnt start. in console.log I get this -

21:10:57.446 [main] WARN  /db/events - unavailable
   com.sun.jersey.api.container.ContainerException: The ResourceConfig instance does not contain any root resource classes.
   at com.sun.jersey.server.impl.application.RootResourceUriRules.<init>(RootResourceUriRules.java:99) ~[jersey-server-1.9.j

Now, in my code I haven't declared any paths as I don't need a REST interface to this, I just want it to start when the server starts and then listen for transaction events and then do something with the transaction data (eg write to a file or a messaging queue)

So my question is -

Do I need to declare a path? Does an unmanaged extension have to be a jaxrs?

Answer 1

You don't need a server extension but just a kernel extension,

so you don't need this config * , which is only for server/REST-extensions:

org.neo4j.server.thirdparty_jaxrs_classes=org.neo4j.extensions.events=/db/events

Just put your jar in the plugins directory and make sure your have the correct META-INF/services/org.neo4j....KernelExtension file packed in the jar with the fully qualified name of your class as content