Play framework1.2.x java.io.IOException: invalid constant type: 18

搭建play framework环境的时候使用的是jdk1.8,报错



Oops: UnexpectedException

An unexpected error occured caused by exception UnexpectedException: While applying class play.classloading.enhancers.ContinuationEnhancer on helpers.CheatSheetHelper$2

play.exceptions.UnexpectedException: While applying play.CorePlugin@32eebfca on helpers.CheatSheetHelper$2

    at play.plugins.PluginCollection.enhance(PluginCollection.java:556)

    at play.classloading.ApplicationClasses$ApplicationClass.enhance(ApplicationClasses.java:235)

    at play.classloading.ApplicationClassloader.loadApplicationClass(ApplicationClassloader.java:167)

    at play.classloading.ApplicationClassloader.getAllClasses(ApplicationClassloader.java:431)

    at play.Play.start(Play.java:523)

    at play.Play.detectChanges(Play.java:637)

    at play.Invoker$Invocation.init(Invoker.java:198)

    at Invocation.HTTP Request(Play!)

Caused by: play.exceptions.UnexpectedException: While applying class play.classloading.enhancers.ContinuationEnhancer on helpers.CheatSheetHelper$2

    at play.CorePlugin.enhance(CorePlugin.java:302)

    at play.plugins.PluginCollection.enhance(PluginCollection.java:551)

    ... 7 more

Caused by: java.lang.RuntimeException: java.io.IOException: invalid constant type: 18

    at javassist.CtClassType.getClassFile2(CtClassType.java:203)

    at javassist.CtClassType.subtypeOf(CtClassType.java:303)

    at javassist.CtClassType.subtypeOf(CtClassType.java:318)

    at play.classloading.enhancers.ContinuationEnhancer.enhanceThisClass(ContinuationEnhancer.java:49)

    at play.CorePlugin.enhance(CorePlugin.java:297)

    ... 8 more

Caused by: java.io.IOException: invalid constant type: 18

    at javassist.bytecode.ConstPool.readOne(ConstPool.java:1027)

    at javassist.bytecode.ConstPool.read(ConstPool.java:970)

    at javassist.bytecode.ConstPool.<init>(ConstPool.java:127)

    at javassist.bytecode.ClassFile.read(ClassFile.java:693)

    at javassist.bytecode.ClassFile.<init>(ClassFile.java:85)

    at javassist.CtClassType.getClassFile2(CtClassType.java:190)

    ... 12 more

解决方法是将jdk1.8更换成jdk1.7,原因是运行环境不兼容。