[GROOVY-2135] failed to reference an instance defined in enum class with the syntax like Planet.MERCURY

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 1.1-beta-3
• Fix Version/s: 1.5.7, 1.6-beta-2
• Environment: Groovy1.1 rc1, jdk6u2, winxp
• Assignee: Jochen Theodorou
• Reporter: Daniel Sun
• Created: 23/Sep/07 05:11
• Updated: 23/Jun/08 06:14
• Resolved: 23/Jun/08 06:14

Description

I failed to run the following code with groovy1.1 rc1

Planet.groovy

public enum Planet {
    MERCURY (3.303e+23, 2.4397e6),
    VENUS   (4.869e+24, 6.0518e6),
    EARTH   (5.976e+24, 6.37814e6),
    MARS    (6.421e+23, 3.3972e6),
    JUPITER (1.9e+27,   7.1492e7),
    SATURN  (5.688e+26, 6.0268e7),
    URANUS  (8.686e+25, 2.5559e7),
    NEPTUNE (1.024e+26, 2.4746e7),
    PLUTO   (1.27e+22,  1.137e6);

    private final double mass;   // in kilograms
    private final double radius; // in meters
    Planet(double mass, double radius) {
        this.mass = mass;
        this.radius = radius;
    }
    public double mass()   { return mass; }
    public double radius() { return radius; }

    // universal gravitational constant  (m3 kg-1 s-2)
    public static final double G = 6.67300E-11;

    public double surfaceGravity() {
        return G * mass / (radius * radius);
    }
    public double surfaceWeight(double otherMass) {
        return otherMass * surfaceGravity();
    }
    public String toString() {
        return mass + ", " + radius;
    }
    
    public static void main(String[] args) {
    	System.out.println(Planet.MERCURY);
    }
}

Groovy complains:
Exception thrown: java.lang.InstantiationException: Planet

java.lang.InstantiationException: Planet
at java.lang.Class.newInstance0(Class.java:340)
at java.lang.Class.newInstance(Class.java:308)
at org.codehaus.groovy.runtime.InvokerHelper.createScript(InvokerHelper.java:366)
at groovy.lang.GroovyShell.parse(GroovyShell.java:500)
at groovy.lang.GroovyShell.parse(GroovyShell.java:480)
at groovy.lang.GroovyShell.evaluate(GroovyShell.java:458)
at groovy.lang.GroovyShell.evaluate(GroovyShell.java:400)
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.metaclass.ReflectionMetaMethod.invoke(ReflectionMetaMethod.java:64)
at org.codehaus.groovy.runtime.MetaClassHelper.doMethodInvoke(MetaClassHelper.java:537)
at groovy.lang.MetaClassImpl.invokeMethod(MetaClassImpl.java:772)
at groovy.lang.MetaClassImpl.invokeMethod(MetaClassImpl.java:614)
at org.codehaus.groovy.runtime.Invoker.invokePogoMethod(Invoker.java:98)
at org.codehaus.groovy.runtime.Invoker.invokeMethod(Invoker.java:79)
at org.codehaus.groovy.runtime.InvokerHelper.invokeMethod(InvokerHelper.java:74)
at org.codehaus.groovy.runtime.ScriptBytecodeAdapter.invokeMethodN(ScriptBytecodeAdapter.java:158)
at groovy.ui.Console$_runScript_closure10.doCall(Console.groovy:681)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at org.codehaus.groovy.runtime.metaclass.ReflectionMetaMethod.invoke(ReflectionMetaMethod.java:64)
at org.codehaus.groovy.runtime.MetaClassHelper.doMethodInvoke(MetaClassHelper.java:537)
at org.codehaus.groovy.runtime.metaclass.ClosureMetaClass.invokeMethod(ClosureMetaClass.java:224)
at org.codehaus.groovy.runtime.ScriptBytecodeAdapter.invokeMethodOnCurrentN(ScriptBytecodeAdapter.java:66)
at groovy.ui.Console$_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.metaclass.ReflectionMetaMethod.invoke(ReflectionMetaMethod.java:64)
at org.codehaus.groovy.runtime.MetaClassHelper.doMethodInvoke(MetaClassHelper.java:537)
at org.codehaus.groovy.runtime.metaclass.ClosureMetaClass.invokeMethod(ClosureMetaClass.java:224)
at groovy.lang.MetaClassImpl.invokeMethod(MetaClassImpl.java:614)
at groovy.lang.Closure.call(Closure.java:292)
at groovy.lang.Closure.call(Closure.java:287)
at groovy.lang.Closure.run(Closure.java:368)
at java.lang.Thread.run(Thread.java:619)