在Java中创建Neo4j关系时出错

Question

I have created nodes and relationships in java, their values are coming from DB and will be dynamically assigned.

GraphDatabaseService graphDb= new GraphDatabaseFactory().newEmbeddedDatabase("D://MyGraph);
//Data access logic Code here
.............
while(rs.next())
{
    String node1=   rs.getString("App_Name"); 
    String rel  =   rs.getString("Interface_Name");
    String node2=   rs.getString("Corresponding_App");
    Transaction tx=graphDb.beginTx();       
    try{        
        RelationshipType rel1 =DynamicRelationshipType.withName(rel);                       
        Node nodeName1 = graphDb.createNode(); 
        Node nodeName2 = graphDb.createNode();                  
        nodeName1.addLabel(DynamicLabel.label((node1)));                    
        nodeName1.setProperty("name", (node1));
        nodeName2.addLabel(DynamicLabel.label((node2)));                    
        nodeName2.setProperty("name", (node2));
        nodeName1.createRelationshipTo(nodeName2, rel1);
        tx.success();
        ...
    }
    ...
}

However i am getting an error --

"java.lang.AbstractMethodError: org.neo4j.graphdb.index.IndexProvider.load(Lorg/neo4j/graphdb/DependencyResolver;)Lorg/neo4j/graphdb/index/IndexImplementation;  at org.neo4j.graphdb.index.IndexProviderKernelExtensionFactory$IndexProviderKernelExtension.start(IndexProviderKernelExtensionFactory.java:72)
       at org.neo4j.kernel.lifecycle.LifeSupport$LifecycleInstance.start(LifeSupport.java:498)"

Please guide.

Answer 1

As Stefan already suggested, you're having version conflicts with your jars. I strongly advise you to use maven or gradle to manage your dependencies. Neo4j 2.0.1 has the following dependencies, in case you still want to add them manually to your project:

[INFO] \- org.neo4j:neo4j:jar:2.0.1:compile
[INFO]    +- org.neo4j:neo4j-kernel:jar:2.0.1:compile
[INFO]    |  \- org.apache.geronimo.specs:geronimo-jta_1.1_spec:jar:1.1.1:compile
[INFO]    +- org.neo4j:neo4j-lucene-index:jar:2.0.1:compile
[INFO]    |  \- org.apache.lucene:lucene-core:jar:3.6.2:compile
[INFO]    +- org.neo4j:neo4j-graph-algo:jar:2.0.1:compile
[INFO]    +- org.neo4j:neo4j-udc:jar:2.0.1:compile
[INFO]    +- org.neo4j:neo4j-graph-matching:jar:2.0.1:compile
[INFO]    +- org.neo4j:neo4j-cypher:jar:2.0.1:compile
[INFO]    |  +- org.neo4j:neo4j-cypher-commons:jar:2.0.1:compile
[INFO]    |  +- org.neo4j:neo4j-cypher-compiler-1.9:jar:2.0.1:compile
[INFO]    |  +- org.neo4j:neo4j-cypher-compiler-2.0:jar:2.0.1:compile
[INFO]    |  |  \- org.parboiled:parboiled-scala_2.10:jar:1.1.6:compile
[INFO]    |  |     \- org.parboiled:parboiled-core:jar:1.1.6:compile
[INFO]    |  +- com.googlecode.concurrentlinkedhashmap:concurrentlinkedhashmap-lru:jar:1.3.1:compile
[INFO]    |  \- org.scala-lang:scala-library:jar:2.10.3:compile
[INFO]    \- org.neo4j:neo4j-jmx:jar:2.0.1:compile

Answer 2

This looks most likely like having mixed versions of Neo4j on your classpath. Make sure that all Neo4j jars are used with the same version, that there are no duplicate jars on the classpath and all the dependencies are in place.

If further help is required, attach the current classpath settings here.