How to force interpreter show complete stack trace?

Question

Is there any way to force Scala interpreter (started through SBT) to print complete stack trace. By default, less than 10 lines are displayed:

scala> new CacheMonitoringClient
javax.management.InstanceNotFoundException: com.bea:Name=DomainRuntimeService,Type=weblogic.management.beanservers.domainrun
time.DomainRuntimeServiceMBean
        at weblogic.rjvm.ResponseImpl.unmarshalReturn(ResponseImpl.java:195)
        at weblogic.rmi.internal.BasicRemoteRef.invoke(BasicRemoteRef.java:224)
        at javax.management.remote.rmi.RMIConnectionImpl_921_WLStub.getAttribute(Unknown Source)
        at weblogic.management.remote.common.RMIConnectionWrapper$11.run(ClientProviderBase.java:498)
        at weblogic.security.acl.internal.AuthenticatedSubject.doAs(AuthenticatedSubject.java:363)
        at weblogic.security.service.SecurityManager.runAs(SecurityManager.java:147)
        at weblogic.security.Security.runAs(Security.java:61)
        at weblogic.management.remote.common.RMIConnectionWrapper.getAttribute(ClientProviderBas...

As a workaround I'm using try { new CacheMonitoringClient } catch { case ex => ex.printStackTrace} (explicitly wrapping the calls that throw the exceptions I'm interested in), but that really ugly...

score 22 · Accepted Answer · answered Sep 22 '10 at 13:40

Use lastException if you want just one thing:

scala> 1 / 0
java.lang.ArithmeticException: / by zero
    at .<init>(<console>:12)
    at .<clinit>(<console>)
    at RequestResult$.<init>(<console>:9)
    at RequestResult$.<clinit>(<console>)
    at RequestResult$scala_repl_result(<console>)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
    at java.lang.reflect.Method.invoke(Method.java:597)
    at scala.tools.nsc.Interpreter$Request$$anonfun$loadAndRun$1$$anonfun$apply$18.apply(Interpreter.scala:981)
    at scala.tools.nsc.Interpreter$Request$$anonfun$loadAndRun$1$$anonfun$apply$18.apply(Interpreter.scala:981)
    at scala.util.control.Exception$Catch.apply(Exception.scala:79)
    at scal...
scala> lastException.printStackTrace
java.lang.ArithmeticException: / by zero
    at line101$object$$iw$$iw$$iw$$iw$$iw$$iw$.<init>(<console>:12)
    at line101$object$$iw$$iw$$iw$$iw$$iw$$iw$.<clinit>(<console>)
    at RequestResult$line101$object$.<init>(<console>:9)
    at RequestResult$line101$object$.<clinit>(<console>)
    at RequestResult$line101$object.scala_repl_result(<console>)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
    at java.lang.reflect.Method.invoke(Method.java:597)
    at scala.tools.nsc.Interpreter$Request$$anonfun$loadAndRun$1$$anonfun$apply$18.apply(Interpreter.scala:981)
    at scala.tools.nsc.Interpreter$Request$$anonfun$loadAndRun$1$$anonfun$apply$18.apply(Interpreter.scala:981)
    at scala.util.control.Exception$Catch.apply(Exception.scala:79)
    at scala.tools.nsc.Interpreter$Request$$anonfun$loadAndRun$1.apply(Interpreter.scala:980)
    at scala.tools.nsc.Interpreter$Request$$anonfun$loadAndRun$1.apply(Interpreter.scala:980)
    at scala.util.control.Exception$Catch.apply(Exception.scala:79)
    at scala.tools.nsc.Interpreter$Request.loadAndRun(Interpreter.scala:979)
    at scala.tools.nsc.Interpreter.loadAndRunReq$1(Interpreter.scala:578)
    at scala.tools.nsc.Interpreter.interpret(Interpreter.scala:597)
    at scala.tools.nsc.Interpreter.interpret(Interpreter.scala:575)
    at scala.tools.nsc.InterpreterLoop.reallyInterpret$1(InterpreterLoop.scala:471)
    at scala.tools.nsc.InterpreterLoop.interpretStartingWith(InterpreterLoop.scala:514)
    at scala.tools.nsc.InterpreterLoop.command(InterpreterLoop.scala:361)
    at scala.tools.nsc.InterpreterLoop.processLine$1(InterpreterLoop.scala:242)
    at scala.tools.nsc.InterpreterLoop.repl(InterpreterLoop.scala:248)
    at scala.tools.nsc.InterpreterLoop.main(InterpreterLoop.scala:558)
    at scala.tools.nsc.MainGenericRunner$.main(MainGenericRunner.scala:72)
    at scala.tools.nsc.MainGenericRunner.main(MainGenericRunner.scala)

Or set settings.maxPrintString to 0, though that will change how normal results are printed too.

scala> settings.maxPrintString = 0

scala> 1 /0
java.lang.ArithmeticException: / by zero
    at .<init>(<console>:12)
    at .<clinit>(<console>)
    at RequestResult$.<init>(<console>:9)
    at RequestResult$.<clinit>(<console>)
    at RequestResult$scala_repl_result(<console>)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
    at java.lang.reflect.Method.invoke(Method.java:597)
    at scala.tools.nsc.Interpreter$Request$$anonfun$loadAndRun$1$$anonfun$apply$18.apply(Interpreter.scala:981)
    at scala.tools.nsc.Interpreter$Request$$anonfun$loadAndRun$1$$anonfun$apply$18.apply(Interpreter.scala:981)
    at scala.util.control.Exception$Catch.apply(Exception.scala:79)
    at scala.tools.nsc.Interpreter$Request$$anonfun$loadAndRun$1.apply(Interpreter.scala:980)
    at scala.tools.nsc.Interpreter$Request$$anonfun$loadAndRun$1.apply(Interpreter.scala:980)
    at scala.util.control.Exception$Catch.apply(Exception.scala:79)
    at scala.tools.nsc.Interpreter$Request.loadAndRun(Interpreter.scala:979)
    at scala.tools.nsc.Interpreter.loadAndRunReq$1(Interpreter.scala:578)
    at scala.tools.nsc.Interpreter.interpret(Interpreter.scala:597)
    at scala.tools.nsc.Interpreter.interpret(Interpreter.scala:575)
    at scala.tools.nsc.InterpreterLoop.reallyInterpret$1(InterpreterLoop.scala:471)
    at scala.tools.nsc.InterpreterLoop.interpretStartingWith(InterpreterLoop.scala:514)
    at scala.tools.nsc.InterpreterLoop.command(InterpreterLoop.scala:361)
    at scala.tools.nsc.InterpreterLoop.processLine$1(InterpreterLoop.scala:242)
    at scala.tools.nsc.InterpreterLoop.repl(InterpreterLoop.scala:248)
    at scala.tools.nsc.InterpreterLoop.main(InterpreterLoop.scala:558)
    at scala.tools.nsc.MainGenericRunner$.main(MainGenericRunner.scala:72)
    at scala.tools.nsc.MainGenericRunner.main(MainGenericRunner.scala)

@Missing Keep paying attention to paulp on mailing lists and irc, and he will sometimes show off some new trick he implemented. Other than that, just press `` and see what's there, see what methods are implemented, go to power mode and repeat, etc. — Daniel C. Sobral, Sep 22 '10 at 22:18
For more recent versions of Scala 2.x, you cannot use `settings.maxPrintString`, instead see here: https://stackoverflow.com/questions/9516567/settings-maxprintstring-for-scala-2-9-repl — RyanQuey, Apr 05 '22 at 15:21

score 0 · Answer 2 · answered Sep 22 '10 at 11:07

0

Have you tried

trace on

in SBT before entering the console? On is the default, but perhaps it is being overwritten in your case.

answered Sep 22 '10 at 11:07

Synesso

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Tried against SBT 0.7.4. No difference with trace on/off - in the both cases, stack trace is displayed and cut. – Vasil Remeniuk Sep 22 '10 at 11:15
Yes, just tried it myself (had to install first). Also tried the trace option but there's no difference. Sorry for the red herring. – Synesso Sep 22 '10 at 11:21
I note that the REPL will also truncate exceptions outside of an SBT context, so it may not be SBT doing this. – Synesso Sep 22 '10 at 11:32

How to force interpreter show complete stack trace?

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