[jira] [Updated] (BEANUTILS-408) MethodUtils.invokeMethod() throws NullPointerException when args==null

["Benedikt Ritter (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/BEANUTILS-408?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Benedikt Ritter updated BEANUTILS-408:
--------------------------------------

    Summary: MethodUtils.invokeMethod() throws NullPointerException when args==null  (was: MethodUtils.invokeSetterMethods() throws NullPointerException when args==null)
    
> MethodUtils.invokeMethod() 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
>             Fix For: 1.8.4
>
>
> 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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