我使用Spark加载带有Cassandra后端和弹性搜索的Janusgraph，两者都在本地运行。
val conf = new BaseConfiguration()
conf.setProperty("storage.backend", "cassandrathrift")
conf.setProperty("storage.hostname", "127.0.0.1")
conf.setProperty("index.search.backend","elasticsearch")
conf.setProperty("index.search.hostname", "127.0.0.1")
val gr = JanusGraphFactory.open(conf)
然而，我收到此错误，
main" java.lang.IllegalArgumentException: Could not find implementation class: org.janusgraph.diskstorage.cassandra.thrift.CassandraThriftStoreManager
at org.janusgraph.util.system.ConfigurationUtil.instantiate(ConfigurationUtil.java:61)
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:113)
at Test2$$anonfun$main$1.apply$mcVI$sp(make_graph3.scala:177)
at scala.collection.immutable.Range.foreach$mVc$sp(Range.scala:160)
at Test2$.main(make_graph3.scala:162)
at Test2.main(make_graph3.scala)
Caused by: java.lang.ClassNotFoundException: org.janusgraph.diskstorage.cassandra.thrift.CassandraThriftStoreManager
at java.net.URLClassLoader.findClass(URLClassLoader.java:381)
at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:338)
at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
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)
... 10 more
我尝试在终端上运行jps，这是输出：
32689 NailgunRunner
44609 GremlinServer
32162
44917 Jps
44326 CassandraDaemon
44744启动器
44509 Elasticsearch
所以，Cassandra和ES都在运行。可能是什么问题？
提前致谢。