Method exceptionMessage

java/tests/src/main/java/tests/BaseTest.java:378–408

(Object e)

    }

    public String exceptionMessage(Object e) {
        // Walk the cause chain — reflection wraps the real exception in
        // InvocationTargetException → CompletionException → ..., so the
        // surface message alone usually hides the real exchange/parser error.
        // The 4-frame stack tail at the end pinpoints opaque JDK exceptions
        // (IndexOutOfBoundsException, NullPointerException) that have no message.
        if (!(e instanceof Throwable)) return String.valueOf(e);
        Throwable cur = (Throwable) e;
        StringBuilder sb = new StringBuilder();
        int depth = 0;
        Throwable deepest = cur;
        while (cur != null && depth < 5) {
            if (depth > 0) sb.append(" → caused by: ");
            sb.append("[").append(cur.getClass().getSimpleName()).append("] ");
            sb.append(String.valueOf(cur.getMessage()));
            deepest = cur;
            cur = cur.getCause();
            depth++;
        }
        if (deepest != null && deepest.getStackTrace() != null) {
            StackTraceElement[] st = deepest.getStackTrace();
            int shown = 0;
            for (int i = 0; i < st.length && shown < 4; i++) {
                String fr = st[i].toString();
                if (fr.startsWith("java.base/jdk.internal") || fr.startsWith("java.base/java.util.Objects")) continue;
                sb.append(" @ ").append(fr);
                shown++;
            }
        }
        return sb.toString();
    }

    public static CompletableFuture<Void> close(Object exchange) {
        // do nothing