Java program unable to create lock on Neo4j database

Java program unable to create lock on Neo4j database

I am getting the following error while connecting to Neo4j:
Exception in thread "main" java.lang.RuntimeException:
org.neo4j.kernel.lifecycle.LifecycleException: Component
'org.neo4j.kernel.StoreLockerLifecycleAdapter@1798b372' was successfully
initialized, but failed to start. Please see attached cause exception.
at
org.neo4j.kernel.InternalAbstractGraphDatabase.run(InternalAbstractGraphDatabase.java:281)
at
org.neo4j.kernel.EmbeddedGraphDatabase.<init>(EmbeddedGraphDatabase.java:106)
at
org.neo4j.graphdb.factory.GraphDatabaseFactory$1.newDatabase(GraphDatabaseFactory.java:88)
at
org.neo4j.graphdb.factory.GraphDatabaseBuilder.newGraphDatabase(GraphDatabaseBuilder.java:207)
at
org.neo4j.graphdb.factory.GraphDatabaseFactory.newEmbeddedDatabase(GraphDatabaseFactory.java:69)
at com.neo4j.NeoStart.createDatabase(NeoStart.java:41)
at com.neo4j.NeoStart.main(NeoStart.java:26)
Caused by: org.neo4j.kernel.lifecycle.LifecycleException: Component
'org.neo4j.kernel.StoreLockerLifecycleAdapter@1798b372' was successfully
initialized, but failed to start. Please see attached cause exception.
at
org.neo4j.kernel.lifecycle.LifeSupport$LifecycleInstance.start(LifeSupport.java:497)
at org.neo4j.kernel.lifecycle.LifeSupport.start(LifeSupport.java:104)
at
org.neo4j.kernel.InternalAbstractGraphDatabase.run(InternalAbstractGraphDatabase.java:259)
... 6 more
Caused by: org.neo4j.kernel.StoreLockException: Could not create lock file
at org.neo4j.kernel.StoreLocker.checkLock(StoreLocker.java:74)
at
org.neo4j.kernel.StoreLockerLifecycleAdapter.start(StoreLockerLifecycleAdapter.java:40)
at
org.neo4j.kernel.lifecycle.LifeSupport$LifecycleInstance.start(LifeSupport.java:491)
I have installed neo4j as: apt-get install neo4j in ubuntu 12.04
DB_PATH I am using is as below: private static final String
neo4j_DB_PATH="/var/lib/neo4j/data/graph.db";
Please help me to resolve this problem...