用java远程连接到rexter

Question

我想从我的本地机器上运行的java应用程序连接到泰坦数据库。我的Titan + Cassandra + Rexter安装在远程机器上运行。

我试图做这样

RexsterClient client = RexsterClientFactory.open("192.168.30.62"); 
    List<Map<String, Object>> results = client.execute("g.v(1).map"); 
    Map<String, Object> map = results.get(0); 
    System.out.println(map); 

但trowing此异常

java.lang.reflect.InvocationTargetException 
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) 
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57) 
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) 
    at java.lang.reflect.Method.invoke(Method.java:606) 
    at org.codehaus.mojo.exec.ExecJavaMojo$1.run(ExecJavaMojo.java:293) 
    at java.lang.Thread.run(Thread.java:744) 
Caused by: com.tinkerpop.rexster.client.RexProException: An error occurred while processing the script for language [groovy]. All transactions across all graphs in the session have been concluded with failure: javax.script.ScriptException: javax.script.ScriptException: groovy.lang.MissingPropertyException: No such property: g for class: Script4 
    at com.tinkerpop.rexster.client.RexsterClient.execute(RexsterClient.java:220) 
    at com.tinkerpop.rexster.client.RexsterClient.execute(RexsterClient.java:148) 
    at Titan.Titan.App.main(App.java:27) 
    ... 6 more 
[WARNING] thread Thread[Grizzly(1) SelectorRunner,5,Titan.Titan.App] was interrupted but is still alive after waiting at least 14993msecs 
[WARNING] thread Thread[Grizzly(1) SelectorRunner,5,Titan.Titan.App] will linger despite being asked to die via interruption 
[WARNING] thread Thread[Grizzly(2) SelectorRunner,5,Titan.Titan.App] will linger despite being asked to die via interruption 
[WARNING] thread Thread[Grizzly(3) SelectorRunner,5,Titan.Titan.App] will linger despite being asked to die via interruption 
[WARNING] thread Thread[Grizzly(4) SelectorRunner,5,Titan.Titan.App] will linger despite being asked to die via interruption 
[WARNING] thread Thread[Grizzly(1),5,Titan.Titan.App] will linger despite being asked to die via interruption 
[WARNING] NOTE: 5 thread(s) did not finish despite being asked to via interruption. This is not a problem with exec:java, it is a problem with the running code. Although not serious, it should be remedied. 
[WARNING] Couldn't destroy threadgroup org.codehaus.mojo.exec.ExecJavaMojo$IsolatedThreadGroup[name=Titan.Titan.App,maxpri=10] 
java.lang.IllegalThreadStateException 
    at java.lang.ThreadGroup.destroy(ThreadGroup.java:775) 
    at org.codehaus.mojo.exec.ExecJavaMojo.execute(ExecJavaMojo.java:328) 
    at org.apache.maven.plugin.DefaultBuildPluginManager.executeMojo(DefaultBuildPluginManager.java:133) 
    at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:208) 
    at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:153) 
    at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:145) 
    at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject(LifecycleModuleBuilder.java:108) 
    at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject(LifecycleModuleBuilder.java:76) 
    at org.apache.maven.lifecycle.internal.builder.singlethreaded.SingleThreadedBuilder.build(SingleThreadedBuilder.java:51) 
    at org.apache.maven.lifecycle.internal.LifecycleStarter.execute(LifecycleStarter.java:116) 
    at org.apache.maven.DefaultMaven.doExecute(DefaultMaven.java:361) 
    at org.apache.maven.DefaultMaven.execute(DefaultMaven.java:155) 
    at org.apache.maven.cli.MavenCli.execute(MavenCli.java:584) 
    at org.apache.maven.cli.MavenCli.doMain(MavenCli.java:213) 
    at org.apache.maven.cli.MavenCli.main(MavenCli.java:157) 
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) 
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57) 
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) 
    at java.lang.reflect.Method.invoke(Method.java:606) 
    at org.codehaus.plexus.classworlds.launcher.Launcher.launchEnhanced(Launcher.java:289) 
    at org.codehaus.plexus.classworlds.launcher.Launcher.launch(Launcher.java:229) 
    at org.codehaus.plexus.classworlds.launcher.Launcher.mainWithExitCode(Launcher.java:415) 
    at org.codehaus.plexus.classworlds.launcher.Launcher.main(Launcher.java:356) 

此外，当我尝试使用Grimlin在rexter控制台，它抛出

An error occurred while processing the script for language [groovy]. All transactions across all graphs in the session have been concluded with failure: java.util.concurrent.ExecutionException: javax.script.ScriptException: javax.script.ScriptExcepion" groovy.lang.MissingpropertyException: No such property: g for class: Script1 

我究竟做错了什么？

Answer 1

由于从我answer在小鬼用户邮件列表这个问题采取：

“G”需要绑定作为脚本引擎的可变莫名其妙：

List<Map<String, Object>> results = 
client.execute("g=rexster.getGraph(\\"tinkergraph\\");g.v(1).map"); 
Map<String, Object> map = results.get(0); 
System.out.println(map.get("name")); 

通过向RexsterClientFactory传递一个附加的 参数，可以自动将图形绑定到“g”：

RexsterClient client = RexsterClientFactory.open("localhost","my-titan-graph") 

其中在上述情况中，“G”，将在rexster.xml绑定到名为图形 “我的 - 钛 - 图”。