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...

vlp
– vlp

2017-06-01 12:02:49 +00:00
Commented Jun 1, 2017 at 12:02 — vlp
– vlp, Commented Jun 1, 2017 at 12:02

Alexiy · Accepted Answer · 2017-05-10 10:01:22Z

1

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));

edited May 10, 2017 at 10:01

Alexiy

2,05017 silver badges20 bronze badges

answered Apr 22, 2017 at 20:36

fireandfuel

7421 gold badge9 silver badges23 bronze badges

Sign up to request clarification or add additional context in comments.

Collectives™ on Stack Overflow

Java How to delete a Field Using ASM?

1 Answer 1

Comments

Your Answer

Linked

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

Comments

Your Answer

Sign up or log in

Post as a guest

Linked

Related