Hi guys I've tried to stopping the Enderman from attacking me so i used the LivingSpawnEvent it's kind a hard to stop the attack but i stopped him from SCREAMING and RUNNING.

this my code:

        if (!(event.getEntity() instanceof EndermanEntity))
            return;
        EndermanEntity enderman = (EndermanEntity) event.getEntity();
        try {
            Field field;
            field = enderman.getClass().getDeclaredField("SCREAMING");
            field.setAccessible(true);
            DataParameter<Boolean> screaming = (DataParameter<Boolean>) field.get(enderman);
            enderman.getDataManager().set(screaming, false);
            Field field1;
            field1 = enderman.getClass().getDeclaredField("field_226535_bx_");
            field1.setAccessible(true);
            DataParameter<Boolean> field_226535_bx_ = (DataParameter<Boolean>) field1.get(enderman);
            enderman.getDataManager().set(field_226535_bx_, false);
        } catch (NoSuchFieldException | IllegalAccessException ignored) { }

Any suggestions?

4 hours ago, Bandar said:

getDeclaredField("SCREAMING");

This won't work when you compile your mod and put it in the actual game, due to the game being obfuscated.

Second, attacking is an AI behavior, you'd need to remove it from the enderman's AI tasks.