Accessing titan graph from java

[Alina Arm]

I have a java programm running locally on my machine and Titan+Rexter installation on remote machine

I need my program to be able to access titan graph and read/write/delete from it

I found this approach in the tutorials

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

But when I run this code it complains about second line

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: Script1

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

The same message i get when I run "g.v(1).map" in rexter-console

What am I missing?

[Stephen Mallette]

"g" needs to be bound as a variable in the script engine somehow:

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"));

You can bind the graph automatically to "g" by passing an additional argument to the RexsterClientFactory:

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

where in the above case, "g" will be bound to the graph named "my-titan-graph" in rexster.xml.

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[Alina Arm]

Thanks, it looks better now

        RexsterClient client = RexsterClientFactory.open("192.168.30.62");

        List<Map<String, Object>> results = client.execute("g = rexster.getGraph(\"graph\")");

        //Map<String, Object> map = results.get(0);

        System.out.println("TEST "+results);

        client.close();

 but still throws java.lang.IllegalThreadStateException

[WARNING] Warning: killAfter is now deprecated. Do you need it ? Please comment on MEXEC-6.

TEST [titangraph[cassandra:[127.0.0.1]]]

[WARNING] thread Thread[Grizzly(1) SelectorRunner,5,Titan.Titan.App] was interrupted but is still alive after waiting at least 14999msecs

[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)

понедельник, 23 февраля 2015 г., 17:02:00 UTC+1 пользователь Stephen Mallette написал:

[Stephen Mallette]

I don't recognize that stacktrace at all.....but this doesn't look right:

> List<Map<String, Object>> results = client.execute("g = rexster.getGraph(\"graph\")");

that would return "g" which i guess would serialize out via toString under rexpro.  does the client actually print anything under that scenario?  is the error you are showing a server side error or a client side error?

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[Alina Arm]

Yes, it prints TEST [titangraph[cassandra:[127.0.0.1]]].

It is client side error

среда, 25 февраля 2015 г., 14:26:36 UTC+1 пользователь Stephen Mallette написал:

[Stephen Mallette]

Is there any more to your code than what you are supplying?  Your stacktrace includes lines i don't recognize.  Is there any more context you can provide that could help provide some reference?

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