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I've attached a project that replicates the problem. But the distillation is:
When using Java 8, and building your own {{ @ValidFoo }} annotation, and using it in a Validator class that implements {{ ConstraintValidator<ValidFoo, Foo> }} you get an {{ IllegalArgumentException }} from in the depths of cglib/asm.
While taking my production codebase and trying to replicate this with a small test case, I always seemed to focus in on the Java8/lambda aspect, because that's where we always found this bug occuring. However, I finally managed to isolate that it's the implementation of the {{ ConstraintValidator }} that causes the issue, regardless of whether Java 8 syntax is used in the validator or not.
I suspect this is actually a cglib/asm issue that must be solved by them, but I wanted to report it here, just in case.
The stacktrace looks like:
{ code noformat }
java.lang.IllegalArgumentException
at net.sf.cglib.asm.ClassReader.<init>(Unknown Source)
at net.sf.cglib.asm.ClassReader.<init>(Unknown Source)
at net.sf.cglib.asm.ClassReader.<init>(Unknown Source)
at net.sf.cglib.proxy.BridgeMethodResolver.resolveAll(BridgeMethodResolver.java:61)
at net.sf.cglib.proxy.Enhancer.emitMethods(Enhancer.java:911)
at net.sf.cglib.proxy.Enhancer.generateClass(Enhancer.java:498)
at net.sf.cglib.core.DefaultGeneratorStrategy.generate(DefaultGeneratorStrategy.java:25)
at net.sf.cglib.core.AbstractClassGenerator.create(AbstractClassGenerator.java:216)
at net.sf.cglib.proxy.Enhancer.createHelper(Enhancer.java:377)
at net.sf.cglib.proxy.Enhancer.createClass(Enhancer.java:317)
at org.easymock.internal.ClassProxyFactory.createProxy(ClassProxyFactory.java:175)
at org.easymock.internal.MocksControl.createMock(MocksControl.java:114)
at org.easymock.internal.MocksControl.createMock(MocksControl.java:88)
at org.easymock.internal.MockBuilder.createMock(MockBuilder.java:206)
at org.easymock.internal.MockBuilder.createMock(MockBuilder.java:219)
at org.easymock.internal.MockBuilder.createMock(MockBuilder.java:188)
at com.company.app.module.constraint.validator.FooValidatorNoJava8Test.createPartialMock(FooValidatorNoJava8Test.java:38)
at com.company.app.module.constraint.validator.FooValidatorNoJava8Test.testValid(FooValidatorNoJava8Test.java:25)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:47)
at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:44)
at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17)
at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:271)
at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:70)
at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:50)
at org.junit.runners.ParentRunner$3.run(ParentRunner.java:238)
at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:63)
at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:236)
at org.junit.runners.ParentRunner.access$000(ParentRunner.java:53)
at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:229)
at org.junit.runners.ParentRunner.run(ParentRunner.java:309)
at org.junit.runners.Suite.runChild(Suite.java:127)
at org.junit.runners.Suite.runChild(Suite.java:26)
at org.junit.runners.ParentRunner$3.run(ParentRunner.java:238)
at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:63)
at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:236)
at org.junit.runners.ParentRunner.access$000(ParentRunner.java:53)
at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:229)
at org.junit.runners.ParentRunner.run(ParentRunner.java:309)
at org.junit.runner.JUnitCore.run(JUnitCore.java:160)
at com.intellij.junit4.JUnit4IdeaTestRunner.startRunnerWithArgs(JUnit4IdeaTestRunner.java:74)
at com.intellij.rt.execution.junit.JUnitStarter.prepareStreamsAndStart(JUnitStarter.java:211)
at com.intellij.rt.execution.junit.JUnitStarter.main(JUnitStarter.java:67)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at com.intellij.rt.execution.application.AppMain.main(AppMain.java:134)
{ code noformat }
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