How to configure titan over hbase in java eclipse? - eclipse

Question

using the following commands as given in the tutorial :
http://s3.thinkaurelius.com/docs/titan/0.5.0/hbase.html
TitanGraph graph = TitanFactory.build()
.set("storage.backend","hbase")
.open();
used the maven dependency :
<dependency>
<groupId>com.thinkaurelius.titan</groupId>
<artifactId>titan-hbase</artifactId>
<version>${titan.version}</version>
</dependency>
Following error is shown
Exception in thread "main" java.lang.NoClassDefFoundError: org/apache/hadoop/hbase/MasterNotRunningException
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Class.java:264)
at com.thinkaurelius.titan.util.system.ConfigurationUtil.instantiate(ConfigurationUtil.java:42)
at com.thinkaurelius.titan.diskstorage.Backend.getImplementationClass(Backend.java:479)
at com.thinkaurelius.titan.diskstorage.Backend.getStorageManager(Backend.java:413)
at com.thinkaurelius.titan.graphdb.configuration.GraphDatabaseConfiguration.<init>(GraphDatabaseConfiguration.java:1320)
at com.thinkaurelius.titan.core.TitanFactory.open(TitanFactory.java:94)
at com.thinkaurelius.titan.core.TitanFactory$Builder.open(TitanFactory.java:135)
at pluradj.titan.tinkerpop3.example.JavaExample2.main(JavaExample2.java:26)
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 sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:331)
at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
... 9 more
If possible can you tell the same for cassandra also.

Answer 1

Look here at how to set your runtime classpath in Eclipse: How do I set the runtime classpath in Eclipse 4.2?
It appears your runtime classpath is missing jars due to the NoClassDefFoundError exception. For this specific error, locate the hbase lib directory from your hbase install and add that to your classpath.
If you use Cassandra, you'll need to set your classpath appropriately for Cassandra.
Titan's HBase client config accepts arbitrary keys from hbase-site.xml
(if it's on the CLASSPATH) and I recommend putting that in your path as well.