[TINKERPOP-1175] Anonymous traversals can't be explained

• Type: Bug
• Status: Closed
• Priority: Minor
• Resolution: Fixed
• Affects Version/s: 3.1.1-incubating
• Fix Version/s: 3.2.0-incubating, 3.1.2-incubating
• Component/s: process
• Assignee: Marko A. Rodriguez
• Reporter: Stephen Mallette
• Created: 24/Feb/16 13:11
• Updated: 24/Feb/16 17:38
• Resolved: 24/Feb/16 17:38

Description

This also would apply to any Traversal that doesn't have strategies I think (as odd as that case might be):

gremlin> out().inE().outV().explain()
No value present
Display stack trace? [yN] y
java.util.NoSuchElementException: No value present
	at java.util.Optional.get(Optional.java:135)
	at org.apache.tinkerpop.gremlin.process.traversal.util.TraversalExplanation.toString(TraversalExplanation.java:87)
	at org.codehaus.groovy.runtime.InvokerHelper.format(InvokerHelper.java:634)
	at org.codehaus.groovy.runtime.InvokerHelper.format(InvokerHelper.java:575)
	at org.codehaus.groovy.runtime.InvokerHelper.toString(InvokerHelper.java:130)
	at org.codehaus.groovy.tools.shell.Interpreter.evaluate(Interpreter.groovy:74)
	at org.codehaus.groovy.tools.shell.Groovysh.execute(Groovysh.groovy:187)
	at org.codehaus.groovy.tools.shell.Shell.leftShift(Shell.groovy:122)
	at org.codehaus.groovy.tools.shell.ShellRunner.work(ShellRunner.groovy:95)
	at org.codehaus.groovy.tools.shell.InteractiveShellRunner.super$2$work(InteractiveShellRunner.groovy)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:498)
	at org.codehaus.groovy.reflection.CachedMethod.invoke(CachedMethod.java:93)
	at groovy.lang.MetaMethod.doMethodInvoke(MetaMethod.java:325)
	at groovy.lang.MetaClassImpl.invokeMethod(MetaClassImpl.java:1210)
	at org.codehaus.groovy.runtime.ScriptBytecodeAdapter.invokeMethodOnSuperN(ScriptBytecodeAdapter.java:132)
	at org.codehaus.groovy.runtime.ScriptBytecodeAdapter.invokeMethodOnSuper0(ScriptBytecodeAdapter.java:152)
	at org.codehaus.groovy.tools.shell.InteractiveShellRunner.work(InteractiveShellRunner.groovy:124)
	at org.codehaus.groovy.tools.shell.ShellRunner.run(ShellRunner.groovy:59)
	at org.codehaus.groovy.tools.shell.InteractiveShellRunner.super$2$run(InteractiveShellRunner.groovy)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:498)
	at org.codehaus.groovy.reflection.CachedMethod.invoke(CachedMethod.java:93)
	at groovy.lang.MetaMethod.doMethodInvoke(MetaMethod.java:325)
	at groovy.lang.MetaClassImpl.invokeMethod(MetaClassImpl.java:1210)
	at org.codehaus.groovy.runtime.ScriptBytecodeAdapter.invokeMethodOnSuperN(ScriptBytecodeAdapter.java:132)
	at org.codehaus.groovy.runtime.ScriptBytecodeAdapter.invokeMethodOnSuper0(ScriptBytecodeAdapter.java:152)
	at org.codehaus.groovy.tools.shell.InteractiveShellRunner.run(InteractiveShellRunner.groovy:83)
	at org.codehaus.groovy.vmplugin.v7.IndyInterface.selectMethod(IndyInterface.java:218)
	at org.apache.tinkerpop.gremlin.console.Console.<init>(Console.groovy:144)
	at org.codehaus.groovy.vmplugin.v7.IndyInterface.selectMethod(IndyInterface.java:218)
	at org.apache.tinkerpop.gremlin.console.Console.main(Console.groovy:305)