431                 // Get the names of any assistive technologies to load.  First
 432                 // check the system property and then check the properties
 433                 // file.
 434                 String classNames = System.getProperty("javax.accessibility.assistive_technologies");
 435                 if (classNames == null) {
 436                     classNames = properties.getProperty("assistive_technologies", null);
 437                     if (classNames != null) {
 438                         System.setProperty("javax.accessibility.assistive_technologies", classNames);
 439                     }
 440                 }
 441                 return classNames;
 442             }
 443         });
 444     }
 445 
 446     /**
 447      * Rethrow the AWTError but include the cause.
 448      *
 449      * @param s the error message
 450      * @param e the original exception
 451      * @throw the new AWTError including the cause (the original exception)
 452      */
 453     private static void newAWTError(Throwable e, String s) {
 454         AWTError newAWTError = new AWTError(s);
 455         newAWTError.initCause(e);
 456         throw newAWTError;
 457     }
 458 
 459     /**
 460      * When a service provider for Assistive Technology is not found look for a
 461      * supporting class on the class path and instantiate it.
 462      *
 463      * @param atName the name of the class to be loaded
 464      */
 465     private static void fallbackToLoadClassForAT(String atName) {
 466         try {
 467             Class.forName(atName, false, ClassLoader.getSystemClassLoader()).newInstance();
 468         } catch (ClassNotFoundException e) {
 469             newAWTError(e, "Assistive Technology not found: " + atName);
 470         } catch (InstantiationException e) {
 471             newAWTError(e, "Could not instantiate Assistive Technology: " + atName);

 431                 // Get the names of any assistive technologies to load.  First
 432                 // check the system property and then check the properties
 433                 // file.
 434                 String classNames = System.getProperty("javax.accessibility.assistive_technologies");
 435                 if (classNames == null) {
 436                     classNames = properties.getProperty("assistive_technologies", null);
 437                     if (classNames != null) {
 438                         System.setProperty("javax.accessibility.assistive_technologies", classNames);
 439                     }
 440                 }
 441                 return classNames;
 442             }
 443         });
 444     }
 445 
 446     /**
 447      * Rethrow the AWTError but include the cause.
 448      *
 449      * @param s the error message
 450      * @param e the original exception
 451      * @throws the new AWTError including the cause (the original exception)
 452      */
 453     private static void newAWTError(Throwable e, String s) {
 454         AWTError newAWTError = new AWTError(s);
 455         newAWTError.initCause(e);
 456         throw newAWTError;
 457     }
 458 
 459     /**
 460      * When a service provider for Assistive Technology is not found look for a
 461      * supporting class on the class path and instantiate it.
 462      *
 463      * @param atName the name of the class to be loaded
 464      */
 465     private static void fallbackToLoadClassForAT(String atName) {
 466         try {
 467             Class.forName(atName, false, ClassLoader.getSystemClassLoader()).newInstance();
 468         } catch (ClassNotFoundException e) {
 469             newAWTError(e, "Assistive Technology not found: " + atName);
 470         } catch (InstantiationException e) {
 471             newAWTError(e, "Could not instantiate Assistive Technology: " + atName);