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Getting Insight in Neo4j’s JMX Beans When Running Embedded

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Getting Insight in Neo4j’s JMX Beans When Running Embedded

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Neo4j exposes a lot of valuable information via JMX. Sometimes you want to gain some insight in some JMX beans when running Neo4j in embedded mode. For this it’s crucial to have the neo4j-jmx-[version].jar file on the classpath.

The following short Groovy script demos this by using the @Grab annotation to fetch dependencies:

@Grab(group="org.neo4j", module="neo4j-kernel", version="2.0.1")
@Grab(group="org.neo4j", module="neo4j-lucene-index", version="2.0.1")
@Grab(group='org.neo4j', module='neo4j-jmx', version='2.0.1')

import org.neo4j.graphdb.factory.GraphDatabaseFactory
import org.neo4j.jmx.JmxUtils
def db = new GraphDatabaseFactory().newEmbeddedDatabaseBuilder("/tmp/graph.db")
  .newGraphDatabase()

println "started embedded graph db"

def objectName = JmxUtils.getObjectName(db, "Primitive count")
def numberOfNodesIds = JmxUtils.getAttribute(objectName, "NumberOfNodeIdsInUse")

println "JMX says, we have $numberOfNodesIds node ids in use"

println "shutting down embedded graph db now"
db.shutdown()

For a full reference of all available JMX beans, see the Neo4j manual.


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