Java How to delete a Field Using ASM?

Question

I need to Delete a field In a Class file Using ASM, But im not able to Find anything that works,

for(FieldNode field : classNode.fields) {
    if(field.name.equals("max") && field.value.equals(30)) {
        classNode.fields.remove(field);
        System.out.println("***DELETED " + field.name + " ***");
    }
}

Its giving me a Exeption: DELETED max java.util.ConcurrentModificationException

See [here](https://stackoverflow.com/a/223929/5128464)... – vlp Jun 01 '17 at 12:02 — vlp, Jun 01 '17 at 12:02

score 1 · Answer 1 · edited May 10 '17 at 10:01

Deleting something from a Collection while iterating over it is a bad idea and will everytime throw a java.util.ConcurrentModificationException.

If you operate on Java 8 or newer, please consider using Collection::removeIf and give it a predicate lambda to select the items to remove.

In your case this might work:

classNode.fields.removeIf(field -> field.name.equals("max") && field.value.equals(30));

Java How to delete a Field Using ASM?

1 Answers1