#1808 new

Javassist Duplicate Field for overloaded methods

Reported by shoonmcgregor | April 30th, 2014 @ 08:12 PM

Latest pull has a javassist exception where overloaded methods are detected as duplicates

Framework version:

Reproduction steps:
1.) Modify a play app class (testPackage.TestClass) to have overloaded methods, e.g:

    private static void testMethod (String string) {
    private static void testMethod (Integer integer) {
2.) play precompile


Exception thrown:
Oops: UnexpectedException
An unexpected error occured caused by exception UnexpectedException: While applying class play.classloading.enhancers.LVEnhancer on testPackage.TestClass
play.exceptions.UnexpectedException: While applying play.CorePlugin@4232c52b on testPackage.TestClass
        at play.plugins.PluginCollection.enhance(PluginCollection.java:553)
        at play.classloading.ApplicationClasses$ApplicationClass.enhance(ApplicationClasses.java:235)
        at play.classloading.ApplicationClassloader.loadApplicationClass(ApplicationClassloader.java:165)
        at play.classloading.ApplicationClassloader.getAllClasses(ApplicationClassloader.java:429)
        at play.Play.preCompile(Play.java:603)
        at play.Play.init(Play.java:307)
        at play.server.Server.main(Server.java:160)
Caused by: play.exceptions.UnexpectedException: While applying class play.classloading.enhancers.LVEnhancer on testPackage.TestClass
        at play.CorePlugin.enhance(CorePlugin.java:306)
        at play.plugins.PluginCollection.enhance(PluginCollection.java:548)
        ... 6 more
Caused by: play.exceptions.UnexpectedException: LVEnhancer: cannot enhance the behavior 'testPackage.TestClass.testMethod(java.lang.Integer)'
        at play.classloading.enhancers.LVEnhancer.enhanceThisClass(LVEnhancer.java:112)
        at play.CorePlugin.enhance(CorePlugin.java:301)
        ... 7 more
Caused by: javassist.bytecode.DuplicateMemberException: duplicate field: $testMethod0
        at javassist.bytecode.ClassFile.testExistingField(ClassFile.java:602)
        at javassist.bytecode.ClassFile.addField(ClassFile.java:580)
        at javassist.CtClassType.addField(CtClassType.java:1265)
        at javassist.CtClass.addField(CtClass.java:1049)
        at play.classloading.enhancers.LVEnhancer.enhanceThisClass(LVEnhancer.java:41)
        ... 8 more

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<h2>Play framework</h2>

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Don't have too much expectations. Unless the bug is really a serious "everything is broken" thing, you're creating a ticket to start a discussion. Having a patch (or a branch on Github we can pull from) is better, but then again we'll only pull high quality branches that make sense to be in the core of Play.