IntelliJ Idea (debugging) conditional breakpoint dependent on other breakpoints

Question

I want to set a debug breakpoint in IntelliJ Idea that is only active, if another previous breakpoint was activated. For example i have a breakpoint B1 on line

Answer 1

You can do that in the View Breakpoints... view:

In your case you will first have to set a conditional breakpoint on B1 so that when it is hit then and only then B2 will be triggered.

Answer 2

An alternate programmatic approach to debug specific classes when some condition in some class is met.

/*
 * Breakpoint helper, stops based on a shared state
 *  STOP variable
 *
 * Everything in here should be chainable
 *  to allow adding to breakpoints
 */
public final class DEBUG {

/*
 * global state controlling if we should
 *   stop anywhere
 */
public static volatile boolean STOP = false;

public static volatile List<Object> REFS = new ArrayList<>();

/**
 * add object references when conditions meet
 * for debugging later
 */
public static boolean ADD_REF(Object obj) {
    return ADD_REF(obj, () -> true);
}

public static boolean ADD_REF(Object obj, Supplier<Boolean> condition) {
    if (condition.get()) {
        REFS.add(obj);
        return true;
    }
    return false;
}

/*
 * STOPs on meeting condition
 *  also RETURNS if we should STOP
 *
 * This should be set when a main condition is satisfied
 *      and can be done as part of a breakpoint as well
 */
public static boolean STOP(Supplier<Boolean> condition) {
    if (condition.get()) {
        STOP = true;
        return true;
    }
    return false;
}

public static boolean STOP() {
    return STOP(() -> true);
}

Where you want a condition to set the breakpoint

Where you want to stop based on a condition