What do you use to pass exceptions without losing the stack trace?

To avoid losing the stack trace when throwing an exception in Java, you should use the exception constructor with a cause parameter or the initCause method, or simply rethrow the original exception without creating a new one.

For example:

try {
    // code that may throw an exception
} catch (IOException e) {
    throw new RuntimeException("Error during processing", e); // pass the original exception as cause
}

This way, the call stack is preserved and available for debugging.