NoClassDefFound of MasterNotRunning when using janusgraph backend HBase

Question

I am using janusgraph, with storage backend HBase. Currently I am trying to add vertices to the database. The part of the code is

public class Graph {
  private static JanusGraph graph = JanusGraphFactory.open("conf/jg.properties");

  public static JanusGraph getGraph() {
    return graph;
  } 
  public static void addVertex() {
    for (int i=0; i<5; i++) {
        graph.addVertex("test", i);
    }       
    graph.tx().commit();
  }
}

with the main function calls

Graph.addVertex();

The error is

Exception in thread "main" java.lang.reflect.InvocationTargetException
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at org.eclipse.jdt.internal.jarinjarloader.JarRsrcLoader.main(JarRsrcLoader.java:58)

Caused by: java.lang.NoClassDefFoundError: org/apache/hadoop/hbase/MasterNotRunningException
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Class.java:264)
at org.janusgraph.util.system.ConfigurationUtil.instantiate(ConfigurationUtil.java:56)
at org.janusgraph.diskstorage.Backend.getImplementationClass(Backend.java:477)
at org.janusgraph.diskstorage.Backend.getStorageManager(Backend.java:409)
at org.janusgraph.graphdb.configuration.GraphDatabaseConfiguration.<init>(GraphDatabaseConfiguration.java:1376)
at org.janusgraph.core.JanusGraphFactory.open(JanusGraphFactory.java:164)
at org.janusgraph.core.JanusGraphFactory.open(JanusGraphFactory.java:133)
at org.janusgraph.core.JanusGraphFactory.open(JanusGraphFactory.java:80)    
... 5 more
Caused by: java.lang.ClassNotFoundException: org.apache.hadoop.hbase.MasterNotRunningException
at java.net.URLClassLoader.findClass(URLClassLoader.java:381)
at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
... 16 more

I am using janusgraph 0.2.0, in maven 0.2.0

and hbase 1.2.0, java 1.8

I set storage-hostname=127.0.0.1 in jg.properties, so is it a dependency error? Where is exactly the MasterNotRunning?

Answer 1

I have found the solution, but still curious.

I search the class MasterNotRunning and found this is in package org.apache.hadoop.hbase and finally make a guess to add org.apache.hbase & hbase-client into dependency. And the error disappears.

However, I still could not find the reason of this error. If some code in dependency jar uses the class MasterNotRunning then it should import the hbase-client jar, then this should be already in the dependency. How can this code pass the compiling and finally throws an exception during the running time.

Just add, I uses export->runnable jar file to get my jar, so all the dependencies should be added into it.