Class already loaded exception

[laywin]

Hello,I followed the tutorial to simply create a test case,but got a class alreay loaded exception,code as followed:

public static void main(String[] args)
		throws NoSuchFieldException {

	TypePool typePool = TypePool.Default.ofSystemLoader();
	Class<?> cls = new ByteBuddy().redefine(typePool.describe("com.yx.test.bytebuddy.Foo").resolve(),
			ClassFileLocator.ForClassLoader.ofSystemLoader()).defineField("qux", String.class)
			.make()
			.load(ClassLoader.getSystemClassLoader()).getLoaded();

	assert cls.getDeclaredField("qux") != null;

}

Exception stack:

Exception in thread "main" java.lang.IllegalStateException: Class already loaded: class com.yx.test.bytebuddy.Foo
at net.bytebuddy.dynamic.loading.ByteArrayClassLoader.load(ByteArrayClassLoader.java:307)
at net.bytebuddy.dynamic.loading.ClassLoadingStrategy$Default$WrappingDispatcher.load(ClassLoadingStrategy.java:357)
at net.bytebuddy.dynamic.loading.ClassLoadingStrategy$Default.load(ClassLoadingStrategy.java:143)
at net.bytebuddy.dynamic.TypeResolutionStrategy$Passive.initialize(TypeResolutionStrategy.java:100)
at net.bytebuddy.dynamic.DynamicType$Default$Unloaded.load(DynamicType.java:5686)
at net.bytebuddy.dynamic.DynamicType$Default$Unloaded.load(DynamicType.java:5675)
at com.yx.test.bytebuddy.Main.main(Main.java:24)

through debug, I found that the classloader is not equal, the bytebuddy version is 1.10.1.

expect your answer,thanks!

[raphw]

It means exactly what it says: at the time you are executing the code above, your class com.yx.test.bytebuddy.Foo is already loaded. You need to either rename the class or use ClassLoadingStrategy.Default.INJECT to inject the class into the system class loader. Also make sure that the class is not already loaded.

[laywin]

thanks, ClassLoadingStrategy.Default.INJECT is the way i want!