I'm trying to code to connect Tital to this Cassandra with this code: 
我正在尝试使用以下代码编写代码以将Tital连接到此Cassandra：
TitanGraph graph = TitanFactory.build()
.set("storage.backend","cassandra")
.set("storage.hostname","127.0.0.1")
.open();
However, I am getting this error : 但是，我收到此错误 ：
Exception in thread "main" java.lang.IllegalArgumentException: Could not instantiate implementation: com.thinkaurelius.titan.diskstorage.cassandra.astyanax.AstyanaxStoreManager at com.thinkaurelius.titan.util.system.ConfigurationUtil.instantiate(ConfigurationUtil.java:55) at com.thinkaurelius.titan.diskstorage.Backend.getImplementationClass(Backend.java:473) at com.thinkaurelius.titan.diskstorage.Backend.getStorageManager(Backend.java:407) at com.thinkaurelius.titan.graphdb.configuration.GraphDatabaseConfiguration.(GraphDatabaseConfiguration.java:1320) at com.thinkaurelius.titan.core.TitanFactory.open(TitanFactory.java:94) at com.thinkaurelius.titan.core.TitanFactory.open(TitanFactory.java:84) at com.thinkaurelius.titan.core.TitanFactory$Builder.open(TitanFactory.java:139) at com.txtstreet.bucket.TitanExample.main(TitanExample.java:59) Caused by: java.lang.reflect.InvocationTargetException at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method) at sun.reflect.NativeCon 线程“主”中的异常java.lang.IllegalArgumentException：无法实例化实现：com.thinkaurelius.titan.util.system.ConfigurationUtil.instantiate（ConfigurationUtil.java:55上的com.thinkaurelius.titan.diskstorage.cassandra.astyanax.AstyanaxStoreManager ）在com.thinkaurelius.titan.diskstorage.Backend.getImplementationClass（Backend.java:473）在com.thinkaurelius.titan.diskstorage.Backend.getStorageManager（Backend.java:407）在com.thinkaurelius.titan.graphdb.configuration。 com处com.thinkaurelius.titan.core.TitanFactory.open（TitanFactory.java:94）处的GraphDatabaseConfiguration。（GraphDatabaseConfiguration.java:1320）com处com.thinkaurelius.titan.core.TitanFactory.open（TitanFactory.java:84）处的com.thinkaurelius.titan.core.TitanFactory.open（TitanFactory.java:94） thinkaurelius.titan.core.TitanFactory $ Builder.open（TitanFactory.java:139）位于com.txtstreet.bucket.TitanExample.main（TitanExample.java:59）由以下原因引起：java.lang.reflect.InvocationTargetException at sun.reflect。 sun.reflect.NativeCon上的NativeConstructorAccessorImpl.newInstance0（Native方法） structorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62) at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45) at java.lang.reflect.Constructor.newInstance(Constructor.java:423) at com.thinkaurelius.titan.util.system.ConfigurationUtil.instantiate(ConfigurationUtil.java:44) ... 7 more Caused by: com.thinkaurelius.titan.diskstorage.TemporaryBackendException: Temporary failure in storage backend at com.thinkaurelius.titan.diskstorage.cassandra.astyanax.AstyanaxStoreManager.ensureKeyspaceExists(AstyanaxStoreManager.java:572) at com.thinkaurelius.titan.diskstorage.cassandra.astyanax.AstyanaxStoreManager.(AstyanaxStoreManager.java:291) ... 12 more Caused by: com.netflix.astyanax.connectionpool.exceptions.PoolTimeoutException: PoolTimeoutException: [host=127.0.0.1(127.0.0.1):9160, latency=10003(10003), attempts=1]Timed out waiting for connection at com.netflix.astyanax.connectionpool.impl.SimpleHostConnectionPool.waitForConnecti com.thinkaurelius.titan上java.lang.reflect.Constructor.newInstance（Constructor.java:423）上的sun.reflect.DelegatingConstructorAccessorImpl.newInstance（DelegatingConstructorAccessorImpl.java:45）上的structorAccessorImpl.newInstance（NativeConstructorAccessorImpl.java:62）。 .system.ConfigurationUtil.instantiate（ConfigurationUtil.java:44）... 7更多原因：com.thinkaurelius.titan.diskstorage.TemporaryBackendException：com.thinkaurelius.titan.diskstorage.cassandra.astyanax.AstyanaxStoreManager的存储后端出现临时故障.ensureKeyspaceExists（AstyanaxStoreManager.java:572）位于com.thinkaurelius.titan.diskstorage.cassandra.astyanax.AstyanaxStoreManager。（AstyanaxStoreManager.java:291）...另外12个原因：com.netflix.astyanax.connectionpool.exceptions.PoolTimeoutException ：PoolTimeoutException：[主机= 127.0.0.1（127.0.0.1）：9160，延迟= 10003（10003），尝试= 1]在com.netflix.astyanax.connectionpool.impl.SimpleHostConnectionPool.waitForConnecti上等待连接超时 on(SimpleHostConnectionPool.java:231) at com.netflix.astyanax.connectionpool.impl.SimpleHostConnectionPool.borrowConnection(SimpleHostConnectionPool.java:198) at com.netflix.astyanax.connectionpool.impl.RoundRobinExecuteWithFailover.borrowConnection(RoundRobinExecuteWithFailover.java:84) at com.netflix.astyanax.connectionpool.impl.AbstractExecuteWithFailoverImpl.tryOperation(AbstractExecuteWithFailoverImpl.java:117) at com.netflix.astyanax.connectionpool.impl.AbstractHostPartitionConnectionPool.executeWithFailover(AbstractHostPartitionConnectionPool.java:352) at com.netflix.astyanax.thrift.ThriftClusterImpl.executeSchemaChangeOperation(ThriftClusterImpl.java:146) at com.netflix.astyanax.thrift.ThriftClusterImpl.internalCreateKeyspace(ThriftClusterImpl.java:321) at com.netflix.astyanax.thrift.ThriftClusterImpl.addKeyspace(ThriftClusterImpl.java:294) at com.thinkaurelius.titan.diskstorage.cassandra.astyanax.AstyanaxStoreManager.ensureKeyspaceExists(AstyanaxStoreManager.java:567) ... 13 m com.netflix.astyanax.connectionpool.impl.com上的（SimpleHostConnectionPool.java:231).com.netflix.astyanax.connectionpool.impl.RoundRobinExecuteWithFailover.borrowConnection(RoundRobinExecuteWithFailover.SimpleHostConnectionPool.java:198） com.netflix.astyanax.connectionpool.impl.AbstractExecuteWithFailoverImpl.tryOperation（AbstractExecuteWithFailoverImpl.java:117）com.netflix.astyanax.connectionpool.impl.AbstractHostPartitionConnectionPool.executeWithFailover（AbstractHostPartitionConnectionPool.java:352） .com.netflix.astyanax.thrift.ThriftClusterImpl.executeSchemaChangeOperation（ThriftClusterImpl.java:146）at com.netflix.astyanax.thrift.ThriftClusterImpl.internalCreateKeyspace（ThriftClusterImpl.java:321）at com.netflix.astyanax.thrift.ThriftClusterI com.thinkaurelius.titan.diskstorage.cassandra.astyanax.AstyanaxStoreManager.ensureKeyspaceExists（AstyanaxStoreManager.java:567）... 13 m ore 矿石
