apache/maven · error · IllegalArgumentException

Unrelated types: {} , {}

Error message

Unrelated types: {} , {}

What it means

Error "Unrelated types: {} , {}" thrown in apache/maven.

Source

Thrown at impl/maven-di/src/main/java/org/apache/maven/di/impl/Types.java:91

        } else {
            throw new IllegalArgumentException("Unsupported type: " + type);
        }
    }

    /**
     * Returns the most common type among given types
     */
    public static Type getUppermostType(Type[] types) {
        Type result = types[0];
        for (int i = 1; i < types.length; i++) {
            Type type = types[i];
            if (isAssignable(type, result)) {
                result = type;
                continue;
            } else if (isAssignable(result, type)) {
                continue;
            }
            throw new IllegalArgumentException("Unrelated types: " + result + " , " + type);
        }
        return result;
    }

    /**
     * Returns an array of actual type arguments for a given {@link Type}
     *
     * @param type type whose actual type arguments should be retrieved
     * @return an array of actual type arguments for a given {@link Type}
     */
    public static Type[] getActualTypeArguments(Type type) {
        if (type instanceof Class<?> clazz) {
            return clazz.isArray() ? new Type[] {clazz.getComponentType()} : NO_TYPES;
        } else if (type instanceof ParameterizedType parameterizedType) {
            return parameterizedType.getActualTypeArguments();
        } else if (type instanceof GenericArrayType genericArrayType) {
            return new Type[] {genericArrayType.getGenericComponentType()};
        }

View on GitHub (pinned to e4093d4e12)

When it happens

Trigger: Thrown at impl/maven-di/src/main/java/org/apache/maven/di/impl/Types.java:91 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of apache/maven@e4093d4e12 (2026-08-21). Data as JSON: /api/errors/2df7de7e5df0a49c. Report an issue: GitHub.