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From "Federico Carbonetti (Created) (JIRA)" <j...@apache.org>
Subject [jira] [Created] (BEANUTILS-408) MethodUtils.invokeSetterMethods() throws NullPointerException when args==null
Date Thu, 08 Dec 2011 07:59:42 GMT
MethodUtils.invokeSetterMethods() throws NullPointerException when args==null
-----------------------------------------------------------------------------

                 Key: BEANUTILS-408
                 URL: https://issues.apache.org/jira/browse/BEANUTILS-408
             Project: Commons BeanUtils
          Issue Type: Bug
          Components: Bean / Property Utils
    Affects Versions: 1.8.3
         Environment: Using Beanutils 1.8.3
            Reporter: Federico Carbonetti


When you invoke MethodUtils.invokeExactMethod(object, methodName, args) with args==null you
get a NullPointerException:

java.lang.NullPointerException
	at org.apache.commons.beanutils.MethodUtils.invokeExactMethod(MethodUtils.java:352)
	at org.apache.commons.beanutils.MethodUtils.invokeExactMethod(MethodUtils.java:315)
	...


Reason is: public static Object invokeExactMethod(Object object, String methodName, Object
arg) gets invoked (see r. 305 below) and the null wrapped into an array before invoking public
static Object invokeExactMethod(Object object, String methodName, Object[] args);



286        /**
287         * <p>Invoke a method whose parameter type matches exactly the object
288         * type.</p>
289         *
290         * <p> This is a convenient wrapper for
291         * {@link #invokeExactMethod(Object object,String methodName,Object [] args)}.
292         * </p>
293         *
294         * @param object invoke method on this object
295         * @param methodName get method with this name
296         * @param arg use this argument
297         * @return The value returned by the invoked method
298         *
299         * @throws NoSuchMethodException if there is no such accessible method
300         * @throws InvocationTargetException wraps an exception thrown by the
301         *  method invoked
302         * @throws IllegalAccessException if the requested method is not accessible
303         *  via reflection
304         */
305        public static Object invokeExactMethod(
306                Object object,
307                String methodName,
308                Object arg)
309                throws
310                NoSuchMethodException,
311                IllegalAccessException,
312                InvocationTargetException {
313    
314            Object[] args = {arg};
315            return invokeExactMethod(object, methodName, args);
316    
317        }
318    
319    
320        /**
321         * <p>Invoke a method whose parameter types match exactly the object
322         * types.</p>
323         *
324         * <p> This uses reflection to invoke the method obtained from a call to
325         * <code>getAccessibleMethod()</code>.</p>
326         *
327         * @param object invoke method on this object
328         * @param methodName get method with this name
329         * @param args use these arguments - treat null as empty array
330         * @return The value returned by the invoked method
331         *
332         * @throws NoSuchMethodException if there is no such accessible method
333         * @throws InvocationTargetException wraps an exception thrown by the
334         *  method invoked
335         * @throws IllegalAccessException if the requested method is not accessible
336         *  via reflection
337         */
338        public static Object invokeExactMethod(
339                Object object,
340                String methodName,
341                Object[] args)
342                throws
343                NoSuchMethodException,
344                IllegalAccessException,
345                InvocationTargetException {
346            if (args == null) {
347                args = EMPTY_OBJECT_ARRAY;
348            }  
349            int arguments = args.length;
350            Class[] parameterTypes = new Class[arguments];
351            for (int i = 0; i < arguments; i++) {
352                parameterTypes[i] = args[i].getClass();
353            }
354            return invokeExactMethod(object, methodName, args, parameterTypes);
355    
356        }

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