[jira] [Created] (JDO-780) Potential NullPointerException in code

["XiangzheXu (Jira)" <ji...@apache.org>]

XiangzheXu created JDO-780:
------------------------------

             Summary: Potential NullPointerException in code
                 Key: JDO-780
                 URL: https://issues.apache.org/jira/browse/JDO-780
             Project: JDO
          Issue Type: Bug
    Affects Versions: JDO 3.2
            Reporter: XiangzheXu


In class org.apache.jdo.exectck.Utilities, the method `printClasspath()` could throw an unexpected NullPointerException.

The method is shown as follows.

public void printClasspath() {

  //Get the System Classloader
  ClassLoader loader = ClassLoader.getSystemClassLoader();

  //Get the URLs
  URL[] urls = ((URLClassLoader) loader).getURLs();
 ......
}

The invocation of `ClassLoader.getSystemClassLoader()` could return null in JDK 8, as is depicted in the Javadoc in its source code:

@return  The system <tt>ClassLoader</tt> for delegation, or
<tt>null</tt> if none

If that is the case, the invocation to `getURLs()` could cause a NullPointerException. 
Maybe we could check for null pointer here or mention the potential NullPointerException at the Javadoc?



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