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Published 20 hours ago • verified publisher icon mcamou

Exception type issue

Open mrbrdo opened this issue 10 years ago • 2 comments

First I have to say thanks for this awesome library! I love it.

I have an app that I run via JRuby and then that app calls Scala code and that Scala code will call JRuby code... I got this exception at some point (I think the relevant part of the trace is at the bottom):

Java::JavaLang::ClassCastException: java.lang.String cannot be cast to scala.collection.TraversableOnce

com.tecnoguru.scuby.RubyObj$class.apply(RubyObj.scala:109)
com.tecnoguru.scuby.RubyObject.apply(RubyObj.scala:204)
sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
java.lang.reflect.Method.invoke(Method.java:483)
org.jruby.javasupport.JavaMethod.invokeDirectWithExceptionHandling(JavaMethod.java:455)
org.jruby.javasupport.JavaMethod.invokeDirect(JavaMethod.java:316)
org.jruby.java.invokers.InstanceMethodInvoker.call(InstanceMethodInvoker.java:61)
org.jruby.internal.runtime.methods.AliasMethod.call(AliasMethod.java:61)
org.jruby.runtime.callsite.CachingCallSite.cacheAndCall(CachingCallSite.java:326)
org.jruby.runtime.callsite.CachingCallSite.call(CachingCallSite.java:170)
org.jruby.ast.CallOneArgNode.interpret(CallOneArgNode.java:57)
org.jruby.ast.HashNode.interpret(HashNode.java:109)
org.jruby.ast.CallOneArgNode.interpret(CallOneArgNode.java:57)
org.jruby.ast.NewlineNode.interpret(NewlineNode.java:105)
org.jruby.ast.BlockNode.interpret(BlockNode.java:71)
org.jruby.evaluator.ASTInterpreter.INTERPRET_METHOD(ASTInterpreter.java:74)
org.jruby.internal.runtime.methods.InterpretedMethod.call(InterpretedMethod.java:182)
org.jruby.internal.runtime.methods.DefaultMethod.call(DefaultMethod.java:198)
org.jruby.runtime.callsite.CachingCallSite.cacheAndCall(CachingCallSite.java:326)
org.jruby.runtime.callsite.CachingCallSite.call(CachingCallSite.java:170)
org.jruby.ast.FCallOneArgNode.interpret(FCallOneArgNode.java:36)
org.jruby.ast.NewlineNode.interpret(NewlineNode.java:105)
org.jruby.ast.WhenOneArgNode.whenSlowTest(WhenOneArgNode.java:36)
org.jruby.ast.WhenOneArgNode.when(WhenOneArgNode.java:46)
org.jruby.ast.CaseNode.interpret(CaseNode.java:132)
org.jruby.ast.NewlineNode.interpret(NewlineNode.java:105)
org.jruby.ast.BlockNode.interpret(BlockNode.java:71)
org.jruby.ast.IfNode.interpret(IfNode.java:116)
org.jruby.ast.NewlineNode.interpret(NewlineNode.java:105)
org.jruby.ast.BlockNode.interpret(BlockNode.java:71)
org.jruby.evaluator.ASTInterpreter.INTERPRET_METHOD(ASTInterpreter.java:74)
org.jruby.internal.runtime.methods.InterpretedMethod.call(InterpretedMethod.java:268)
org.jruby.internal.runtime.methods.DefaultMethod.call(DefaultMethod.java:230)
org.jruby.runtime.callsite.CachingCallSite.cacheAndCall(CachingCallSite.java:366)
org.jruby.runtime.callsite.CachingCallSite.call(CachingCallSite.java:238)
org.jruby.ast.FCallThreeArgNode.interpret(FCallThreeArgNode.java:40)
org.jruby.ast.NewlineNode.interpret(NewlineNode.java:105)
org.jruby.ast.BlockNode.interpret(BlockNode.java:71)
org.jruby.ast.IfNode.interpret(IfNode.java:116)
org.jruby.ast.NewlineNode.interpret(NewlineNode.java:105)
org.jruby.ast.BlockNode.interpret(BlockNode.java:71)
org.jruby.evaluator.ASTInterpreter.INTERPRET_METHOD(ASTInterpreter.java:74)
org.jruby.internal.runtime.methods.InterpretedMethod.call(InterpretedMethod.java:225)
org.jruby.internal.runtime.methods.DefaultMethod.call(DefaultMethod.java:214)
org.jruby.runtime.callsite.CachingCallSite.cacheAndCall(CachingCallSite.java:346)
org.jruby.runtime.callsite.CachingCallSite.call(CachingCallSite.java:204)
org.jruby.ast.CallTwoArgNode.interpret(CallTwoArgNode.java:59)
org.jruby.ast.NewlineNode.interpret(NewlineNode.java:105)
org.jruby.ast.BlockNode.interpret(BlockNode.java:71)
org.jruby.evaluator.ASTInterpreter.INTERPRET_METHOD(ASTInterpreter.java:74)
org.jruby.internal.runtime.methods.InterpretedMethod.call(InterpretedMethod.java:112)
org.jruby.internal.runtime.methods.DefaultMethod.call(DefaultMethod.java:164)
org.jruby.RubyClass.finvoke(RubyClass.java:548)
org.jruby.RubyBasicObject.send19(RubyBasicObject.java:1531)
org.jruby.RubyKernel.send19(RubyKernel.java:2250)
org.jruby.RubyKernel$INVOKER$s$send19.call(RubyKernel$INVOKER$s$send19.gen)
org.jruby.internal.runtime.methods.DynamicMethod.call(DynamicMethod.java:180)
org.jruby.runtime.callsite.CachingCallSite.cacheAndCall(CachingCallSite.java:296)
org.jruby.runtime.callsite.CachingCallSite.call(CachingCallSite.java:72)
org.jruby.ast.CallManyArgsNode.interpret(CallManyArgsNode.java:59)
org.jruby.ast.NewlineNode.interpret(NewlineNode.java:105)
org.jruby.ast.BlockNode.interpret(BlockNode.java:71)
org.jruby.ast.RescueNode.executeBody(RescueNode.java:221)
org.jruby.ast.RescueNode.interpret(RescueNode.java:116)
org.jruby.ast.BeginNode.interpret(BeginNode.java:83)
org.jruby.ast.NewlineNode.interpret(NewlineNode.java:105)
org.jruby.ast.BlockNode.interpret(BlockNode.java:71)
org.jruby.ast.IfNode.interpret(IfNode.java:116)
org.jruby.ast.NewlineNode.interpret(NewlineNode.java:105)
org.jruby.ast.BlockNode.interpret(BlockNode.java:71)
org.jruby.ast.IfNode.interpret(IfNode.java:116)
org.jruby.ast.NewlineNode.interpret(NewlineNode.java:105)
org.jruby.ast.BlockNode.interpret(BlockNode.java:71)
org.jruby.evaluator.ASTInterpreter.INTERPRET_METHOD(ASTInterpreter.java:74)
org.jruby.internal.runtime.methods.InterpretedMethod.call(InterpretedMethod.java:182)
org.jruby.internal.runtime.methods.DefaultMethod.call(DefaultMethod.java:198)
org.jruby.runtime.callsite.CachingCallSite.cacheAndCall(CachingCallSite.java:326)
org.jruby.runtime.callsite.CachingCallSite.call(CachingCallSite.java:170)
org.jruby.ast.FCallOneArgNode.interpret(FCallOneArgNode.java:36)
org.jruby.ast.NewlineNode.interpret(NewlineNode.java:105)
org.jruby.ast.IfNode.interpret(IfNode.java:116)
org.jruby.ast.NewlineNode.interpret(NewlineNode.java:105)
org.jruby.ast.BlockNode.interpret(BlockNode.java:71)
org.jruby.evaluator.ASTInterpreter.INTERPRET_METHOD(ASTInterpreter.java:74)
org.jruby.internal.runtime.methods.InterpretedMethod.call(InterpretedMethod.java:139)
org.jruby.internal.runtime.methods.DefaultMethod.call(DefaultMethod.java:182)
org.jruby.runtime.callsite.CachingCallSite.cacheAndCall(CachingCallSite.java:306)
org.jruby.runtime.callsite.CachingCallSite.call(CachingCallSite.java:136)
org.jruby.ast.VCallNode.interpret(VCallNode.java:88)
org.jruby.ast.IfNode.interpret(IfNode.java:116)
org.jruby.ast.NewlineNode.interpret(NewlineNode.java:105)
org.jruby.ast.BlockNode.interpret(BlockNode.java:71)
org.jruby.ast.RescueNode.executeBody(RescueNode.java:221)
org.jruby.ast.RescueNode.interpret(RescueNode.java:116)
org.jruby.ast.EnsureNode.interpret(EnsureNode.java:96)
org.jruby.evaluator.ASTInterpreter.INTERPRET_METHOD(ASTInterpreter.java:74)
org.jruby.internal.runtime.methods.InterpretedMethod.call(InterpretedMethod.java:225)
org.jruby.internal.runtime.methods.DefaultMethod.call(DefaultMethod.java:214)
org.jruby.runtime.callsite.CachingCallSite.cacheAndCall(CachingCallSite.java:346)
org.jruby.runtime.callsite.CachingCallSite.call(CachingCallSite.java:204)
org.jruby.ast.CallTwoArgNode.interpret(CallTwoArgNode.java:59)
org.jruby.ast.NewlineNode.interpret(NewlineNode.java:105)
org.jruby.ast.RescueNode.executeBody(RescueNode.java:221)
org.jruby.ast.RescueNode.interpret(RescueNode.java:116)
org.jruby.evaluator.ASTInterpreter.INTERPRET_METHOD(ASTInterpreter.java:74)
org.jruby.internal.runtime.methods.InterpretedMethod.call(InterpretedMethod.java:225)
org.jruby.internal.runtime.methods.DefaultMethod.call(DefaultMethod.java:214)
org.jruby.runtime.callsite.CachingCallSite.cacheAndCall(CachingCallSite.java:346)
org.jruby.runtime.callsite.CachingCallSite.call(CachingCallSite.java:204)
org.jruby.ast.CallTwoArgNode.interpret(CallTwoArgNode.java:59)
org.jruby.ast.NewlineNode.interpret(NewlineNode.java:105)
org.jruby.evaluator.ASTInterpreter.INTERPRET_METHOD(ASTInterpreter.java:74)
org.jruby.internal.runtime.methods.InterpretedMethod.call(InterpretedMethod.java:112)
org.jruby.internal.runtime.methods.InterpretedMethod.call(InterpretedMethod.java:126)
org.jruby.internal.runtime.methods.DefaultMethod.call(DefaultMethod.java:173)
org.jruby.RubyClass.finvoke(RubyClass.java:671)
org.jruby.runtime.Helpers.invoke(Helpers.java:507)
org.jruby.embed.internal.EmbedRubyObjectAdapterImpl.callEachType(EmbedRubyObjectAdapterImpl.java:353)
org.jruby.embed.internal.EmbedRubyObjectAdapterImpl.call(EmbedRubyObjectAdapterImpl.java:306)
org.jruby.embed.internal.EmbedRubyObjectAdapterImpl.callMethod(EmbedRubyObjectAdapterImpl.java:249)
org.jruby.embed.ScriptingContainer.callMethod(ScriptingContainer.java:1369)

com.tecnoguru.scuby.JRuby$$anonfun$sendUnit$1.apply(JRuby.scala:174)
com.tecnoguru.scuby.JRuby$.handleException(JRuby.scala:256)
com.tecnoguru.scuby.JRuby$.sendUnit(JRuby.scala:174)
com.tecnoguru.scuby.RubyObj$class.call(RubyObj.scala:61)
com.tecnoguru.scuby.RubyObject.call(RubyObj.scala:204)

myapp.Worker$$anonfun$receive$1.applyOrElse(Worker.scala:17)

akka.actor.ActorCell.receiveMessage(ActorCell.scala:498)
akka.actor.ActorCell.invoke(ActorCell.scala:456)
akka.dispatch.Mailbox.processMailbox(Mailbox.scala:237)
akka.dispatch.Mailbox.run(Mailbox.scala:219)
akka.dispatch.ForkJoinExecutorConfigurator$AkkaForkJoinTask.exec(AbstractDispatcher.scala:386)
scala.concurrent.forkjoin.ForkJoinTask.doExec(ForkJoinTask.java:260)
scala.concurrent.forkjoin.ForkJoinPool$WorkQueue.runTask(ForkJoinPool.java:1339)
scala.concurrent.forkjoin.ForkJoinPool.runWorker(ForkJoinPool.java:1979)
scala.concurrent.forkjoin.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:107)

It seems it happens when an exception gets raised (not sure if from ruby or scala code). The problem seems to be in JRuby.scala:256. Any idea?

mrbrdo avatar Nov 19 '14 09:11 mrbrdo

Hello, sorry for taking so long to reply, I started Scuby at my previous job and don't have much time lately. It's difficult to know what happened without seeing your code (the part where you call into Scuby and the Ruby code that returns a value) but just from this I'd think that the Ruby code is returning a String and your code is expecting some other kind of Ruby object. JRuby automatically turns Ruby Strings and Numbers into Java Strings and primitives, which makes it messy to deal with when calling from a statically-typed language like Scala. Any chance you could isolate a bit of that part of the code and provide a gist so I can help further?

mcamou avatar Nov 23 '14 21:11 mcamou

I know what you mean. I am doing a large piece of rewrite into Scala so I can't reproduce right now, but if/when I encounter it again I will try to find what is causing it. Thanks!

mrbrdo avatar Nov 26 '14 15:11 mrbrdo