As part of the major changes in 3.0, the way to log to the user log, now neo4j.log (in server mode), has changed. To log within a Server Plugin follow these steps:
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Include these packages:
import org.neo4j.logging.Log; import org.neo4j.logging.LogService; import org.neo4j.kernel.internal.GraphDatabaseAPI;
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In the method for the Server Plugin, you need the following code to use the logger:
@PluginTarget(GraphDatabaseService.class) public Iterable<String> getAllLabels(@Source GraphDatabaseService graphDb) { LogService logService = ((GraphDatabaseAPI)graphDb).getDependencyResolver().resolveDependency( LogService.class ); Log log = logService.getUserLog( getClass() ); -
Now log using the appropriate method for the
logobject:log.info( "Hello world!" ); log.debug( "Hello debuggers!" );
We get a log that contains lines like this:
2016-12-05 17:33:21.223+0000 INFO Hello world! 2016-12-05 17:33:21.345+0000 DEBUG Hello debuggers!