didi/DoKit · error · IllegalArgumentException

Array has incompatible type: {}

Error message

Array has incompatible type: {}

What it means

LogUtils' internal element formatter stringifies array objects passed to the logger; after the same instanceof chain over boolean[]...short[] and Object[] fails, it throws IllegalArgumentException('Array has incompatible type: <class>'). Nested arrays (int[][]) and unsupported component types are the usual culprits, and the exception is thrown from inside the logging pipeline, so it can crash an app merely because a log statement was added.

Source

Thrown at Android/dokit-util/src/main/java/com/didichuxing/doraemonkit/util/LogUtils.java:1168

                return Arrays.deepToString((Object[]) object);
            } else if (object instanceof boolean[]) {
                return Arrays.toString((boolean[]) object);
            } else if (object instanceof byte[]) {
                return Arrays.toString((byte[]) object);
            } else if (object instanceof char[]) {
                return Arrays.toString((char[]) object);
            } else if (object instanceof double[]) {
                return Arrays.toString((double[]) object);
            } else if (object instanceof float[]) {
                return Arrays.toString((float[]) object);
            } else if (object instanceof int[]) {
                return Arrays.toString((int[]) object);
            } else if (object instanceof long[]) {
                return Arrays.toString((long[]) object);
            } else if (object instanceof short[]) {
                return Arrays.toString((short[]) object);
            }
            throw new IllegalArgumentException("Array has incompatible type: " + object.getClass());
        }
    }

    private static <T> Class getTypeClassFromParadigm(final IFormatter<T> formatter) {
        Type[] genericInterfaces = formatter.getClass().getGenericInterfaces();
        Type type;
        if (genericInterfaces.length == 1) {
            type = genericInterfaces[0];
        } else {
            type = formatter.getClass().getGenericSuperclass();
        }
        type = ((ParameterizedType) type).getActualTypeArguments()[0];
        while (type instanceof ParameterizedType) {
            type = ((ParameterizedType) type).getRawType();
        }
        String className = type.toString();
        if (className.startsWith("class ")) {
            className = className.substring(6);

View on GitHub (pinned to 626827cddb)

Solutions

1. Pre-format such values yourself before logging: Arrays.deepToString(grid) or Arrays.toString(flattened).
2. Do not pass multidimensional or exotic arrays directly to LogUtils.
3. Test with the actual log level enabled before shipping logging of complex payloads.

Example fix

// before
LogUtils.d("Matrix", weights); // weights is float[][] -> throws when formatted

// after
LogUtils.d("Matrix", java.util.Arrays.deepToString(weights));

Object loggable = value != null && value.getClass().isArray()
        && !value.getClass().getComponentType().isArray()
        ? value : (value == null ? null : java.util.Arrays.deepToString((Object[]) value));
LogUtils.d(tag, loggable != null ? loggable : "null");

static boolean isFlatArray(Object o) {
    return o != null && o.getClass().isArray()
            && !o.getClass().getComponentType().isArray();
}

try { LogUtils.d(tag, payload); } catch (IllegalArgumentException e) { LogUtils.d(tag, String.valueOf(payload)); }

When it happens

Trigger: Calling LogUtils.d(tag, int[][]) or logging an object graph whose toString delegation reaches this formatter with a 2D array; the throw happens during formatting, i.e. only when that log level is enabled.

Common situations: Debug logging added late in development that only runs at verbose level (so it survives testing); matrix/byte-buffer data structures; enabling verbose logs in production via a remote switch and crashing on data shapes never tested.

Related errors

• Not an array: " + array.getClass()
• Array has incompatible type: " + array.getClass()
• Unsupported object type: " + object.getClass().getName()
• precision shouldn't be less than zero!
• The key is null.

AI-assisted analysis of didi/DoKit@626827cddb (2026-08-14). Data as JSON: /api/errors/7349133f134acbbc. Report an issue: GitHub.