[GROOVY-1598] Access an element in a Map

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Won't Fix
• Fix Version/s: 1.1-beta-1
• Component/s: syntax
• Environment: Windows XP SP2, JDK 6.0 Final, PC Pentium 4, 3Ghz
• Assignee: Jochen Theodorou
• Reporter: Dinh Pham
• Created: 16/Dec/06 04:50
• Updated: 22/Jan/07 10:58
• Resolved: 22/Jan/07 10:58

Description

Groovy allow to access an element in a Map via dot operator like this:

aMap.aKey

which should return a Element that associates with the above aKey

However it only works with aKey as a object (including String object). So Grooy parser fails to run the below code

class EmptyClass {

}

anObject = new EmptyClass();
x = [1:"Hello", 2:"Hello 2", "name":"pcdinh", "1":"pcdinh1", "2":anObject, anObject:"2"];
println x.1; // It fails
println x."2"; // It works
println x.aGTest; // It works

The exception is thrown as follows:

Exception thrown: org.codehaus.groovy.control.MultipleCompilationErrorsException: startup failed,

org.codehaus.groovy.control.MultipleCompilationErrorsException: startup failed,
at org.codehaus.groovy.control.ErrorCollector.failIfErrors(ErrorCollector.java:326)
at org.codehaus.groovy.control.ErrorCollector.addFatalError(ErrorCollector.java:173)
at org.codehaus.groovy.control.ErrorCollector.addError(ErrorCollector.java:143)
at org.codehaus.groovy.control.ErrorCollector.addError(ErrorCollector.java:155)
at org.codehaus.groovy.control.SourceUnit.addError(SourceUnit.java:382)
at org.codehaus.groovy.antlr.AntlrParserPlugin.parseCST(AntlrParserPlugin.java:87)
at org.codehaus.groovy.control.SourceUnit.parse(SourceUnit.java:279)
at org.codehaus.groovy.control.CompilationUnit$1.call(CompilationUnit.java:184)
at org.codehaus.groovy.control.CompilationUnit.applyToSourceUnits(CompilationUnit.java:833)
at org.codehaus.groovy.control.CompilationUnit.compile(CompilationUnit.java:480)
at groovy.lang.GroovyClassLoader.parseClass(GroovyClassLoader.java:306)
at groovy.lang.GroovyShell.parseClass(GroovyShell.java:513)
at groovy.lang.GroovyShell.parse(GroovyShell.java:525)
at groovy.lang.GroovyShell.parse(GroovyShell.java:505)
at groovy.lang.GroovyShell.evaluate(GroovyShell.java:483)
at groovy.lang.GroovyShell.evaluate(GroovyShell.java:425)
at gjdk.groovy.lang.GroovyShell_GroovyReflector.invoke(Unknown Source)
at groovy.lang.MetaMethod.invoke(MetaMethod.java:115)
at org.codehaus.groovy.runtime.MetaClassHelper.doMethodInvoke(MetaClassHelper.java:713)
at groovy.lang.MetaClassImpl.invokeMethod(MetaClassImpl.java:561)
at groovy.lang.MetaClassImpl.invokeMethod(MetaClassImpl.java:460)
at org.codehaus.groovy.runtime.Invoker.invokeMethod(Invoker.java:131)
at org.codehaus.groovy.runtime.InvokerHelper.invokeMethod(InvokerHelper.java:111)
at org.codehaus.groovy.runtime.ScriptBytecodeAdapter.invokeMethodN(ScriptBytecodeAdapter.java:187)
at groovy.ui.Console$_runScript_closure10.doCall(Console.groovy:503)
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 org.codehaus.groovy.runtime.ReflectionMetaMethod.invoke(ReflectionMetaMethod.java:69)
at org.codehaus.groovy.runtime.MetaClassHelper.doMethodInvoke(MetaClassHelper.java:713)
at groovy.lang.MetaClassImpl.invokeMethod(MetaClassImpl.java:561)
at org.codehaus.groovy.runtime.ScriptBytecodeAdapter.invokeMethodOnCurrentN(ScriptBytecodeAdapter.java:97)
at groovy.ui.Console$_runScript_closure10.doCall(Console.groovy)
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 org.codehaus.groovy.runtime.ReflectionMetaMethod.invoke(ReflectionMetaMethod.java:69)
at org.codehaus.groovy.runtime.MetaClassHelper.doMethodInvoke(MetaClassHelper.java:713)
at groovy.lang.MetaClassImpl.invokeMethod(MetaClassImpl.java:561)
at groovy.lang.MetaClassImpl.invokeMethod(MetaClassImpl.java:460)
at groovy.lang.Closure.call(Closure.java:186)
at groovy.lang.Closure.call(Closure.java:181)
at groovy.lang.Closure.run(Closure.java:262)
at java.lang.Thread.run(Thread.java:619)

It think that the exception is developer-unfriendly. It shows no clue about the errors and how developers should correct his code. It should be improved