How to determine type initializer existence?

[eaglemartin]

Does bytebuddy have API to determine TypeInitializer method exists? So I could check it before instrument TypeInitializer as below,

new AgentBuilder.Transformer.ForAdvice().advice( isTypeInitializer(), "TypeInitializerAdvice" );

[raphw]

This is more tricky than it might seem. If there is a type initializer from before, the above code will work. If not, you will need to add another transformation as:

builder
  .invokable(isTypeInitializer())
  .intercept(StubMethod.INSTANCE)

This will define an empty type initializer. This does however count as changing the method structure, and a redefinition will fail, as the JVM does not allow for that.

[eaglemartin]

I does not want to add a type intializer which will change the class layout, and just need to know there is a type initializer for a type.

I think bytebuddy might add a method such as hasTypeInitializer() to LazyTypeDescription since it is easy to determine this when visiting method in TypeExtractor via ASM.