用jarslink做module隔离时,dubbo调用会抛ClassNotFoundException.经查是ClassLoader不一致.

```
    public static Class<?> getReturnType(Invocation invocation) {
        try {
            if (invocation != null && invocation.getInvoker() != null
                    && invocation.getInvoker().getUrl() != null
                    && !invocation.getMethodName().startsWith("$")) {
                String service = invocation.getInvoker().getUrl().getServiceInterface();
                if (service != null && service.length() > 0) {
                    Class<?> cls = ReflectUtils.forName(service);
                    Method method = cls.getMethod(invocation.getMethodName(), invocation.getParameterTypes());
                    if (method.getReturnType() == void.class) {
                        return null;
                    }
                    return method.getReturnType();
                }
            }
        } catch (Throwable t) {
            logger.warn(t.getMessage(), t);
        }
        return null;
    }
```
*/
    public static final char JVM_BOOLEAN = 'Z';
    /**
     * byte(B).
     */
    public static final char JVM_BYTE = 'B';
    /**
     * char(C).
     */
    public static final char JVM_CHAR = 'C';
    /**
     * double(D).
     */
    public static final char JVM_DOUBLE = 'D';
    /**
     * float(F).
     */
    public static final char JVM_FLOAT = 'F';
    /**
     * int(I).
     */
    public static final char JVM_INT = 'I';
    /**
     * long(J).
     */
    public static final char JVM_LONG = 'J';
    /**
     * short(S).
     */
    public static final char JVM_SHORT = 'S';