groovy - Setting a class property to an Enum value -


i have abstract groovy class have attribute of type enum. however, i'm not clear on how set up.

i have this:

abstract class person {  protected int heightfeet, heightinches, weight protected string firstname, lastname protected occupationtype occupation  protected person(int hf, hi, w, string fn, string ln, int ocp){         this.heightfeet = hf this.heightinches = hi this.weight = w this.firstname = fn this.lastname = ln this.occupation.value = ocp }

and enum looks :

public enum occupationtype {    teacher(1), administrator(2), counselor(3), doctor(4), nurse(5), ...  occupationstype(int value) {this.value = value}  private final int value  public int value() {return value} }

so typically sort of nullpointerexception cannot set value null object. not sure i'm missing, or if @ possible.

java.lang.nullpointerexception: cannot set property 'value' on null object     @ org.codehaus.groovy.runtime.nullobject.setproperty(nullobject.java:66)     @ org.codehaus.groovy.runtime.invokerhelper.setproperty(invokerhelper.java:192)     @ org.codehaus.groovy.runtime.scriptbytecodeadapter.setproperty(scriptbytecodeadapter.java:480)     @ ***.****.***.****.<init>(**.groovy:30)     @ ****.***.***.****.<init>(***.groovy:10)     @ sun.reflect.nativeconstructoraccessorimpl.newinstance0(native method)     @ sun.reflect.nativeconstructoraccessorimpl.newinstance(unknown source)     @ sun.reflect.delegatingconstructoraccessorimpl.newinstance(unknown source)     @ java.lang.reflect.constructor.newinstance(unknown source)     @ org.codehaus.groovy.reflection.cachedconstructor.invoke(cachedconstructor.java:77)     @ org.codehaus.groovy.runtime.callsite.constructorsite$constructorsitenounwrapnocoerce.callconstructor(constructorsite.java:102)     @ org.codehaus.groovy.runtime.callsite.callsitearray.defaultcallconstructor(callsitearray.java:57)     @ org.codehaus.groovy.runtime.callsite.abstractcallsite.callconstructor(abstractcallsite.java:182)     @ buchwalter.oldschoolgame.characters.fightertest.getfullconcrete(fightertest.groovy:18)     @ buchwalter.oldschoolgame.characters.playertest.shouldreturngendertype(playertest.groovy:114)     @ sun.reflect.nativemethodaccessorimpl.invoke0(native method)     @ sun.reflect.nativemethodaccessorimpl.invoke(unknown source)     @ sun.reflect.delegatingmethodaccessorimpl.invoke(unknown source)     @ java.lang.reflect.method.invoke(unknown source)     @ org.junit.runners.model.frameworkmethod$1.runreflectivecall(frameworkmethod.java:45)     @ org.junit.internal.runners.model.reflectivecallable.run(reflectivecallable.java:15)     @ org.junit.runners.model.frameworkmethod.invokeexplosively(frameworkmethod.java:42)     @ org.junit.internal.runners.statements.invokemethod.evaluate(invokemethod.java:20)     @ org.junit.internal.runners.statements.runbefores.evaluate(runbefores.java:28)     @ org.junit.runners.parentrunner.runleaf(parentrunner.java:263)     @ org.junit.runners.blockjunit4classrunner.runchild(blockjunit4classrunner.java:68)     @ org.junit.runners.blockjunit4classrunner.runchild(blockjunit4classrunner.java:47)     @ org.junit.runners.parentrunner$3.run(parentrunner.java:231)     @ org.junit.runners.parentrunner$1.schedule(parentrunner.java:60)     @ org.junit.runners.parentrunner.runchildren(parentrunner.java:229)     @ org.junit.runners.parentrunner.access$000(parentrunner.java:50)     @ org.junit.runners.parentrunner$2.evaluate(parentrunner.java:222)     @ org.junit.runners.parentrunner.run(parentrunner.java:300)     @ org.eclipse.jdt.internal.junit4.runner.junit4testreference.run(junit4testreference.java:50)     @ org.eclipse.jdt.internal.junit.runner.testexecution.run(testexecution.java:38)     @ org.eclipse.jdt.internal.junit.runner.remotetestrunner.runtests(remotetestrunner.java:467)     @ org.eclipse.jdt.internal.junit.runner.remotetestrunner.runtests(remotetestrunner.java:683)     @ org.eclipse.jdt.internal.junit.runner.remotetestrunner.run(remotetestrunner.java:390)     @ org.eclipse.jdt.internal.junit.runner.remotetestrunner.main(remotetestrunner.java:197)

the problem in person constructor. can't set attribute of enumeration. pass enumeration object constructor or pass integer value attribute , find enumeration object has value. i've cleaned example, should work when add remaining constructor parameters:

// won't work because 'this.occupation' null protected person(int ocp) {   this.occupation.value = ocp }

so either pass enumeration object:

protected person(occupationtype type) {   this.occupation = type }

or receive int attribute , find it:

protected person(int ocp) {   this.occupation = occupationtype.find { it.value == ocp } }

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