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

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

    [ https://issues.apache.org/jira/browse/JDO-780?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16913491#comment-16913491 ] 

Michael Bouschen commented on JDO-780:
--------------------------------------

Thanks for the hint. Could you please provide a patch fixing the issue?

> Potential NullPointerException in code
> --------------------------------------
>
>                 Key: JDO-780
>                 URL: https://issues.apache.org/jira/browse/JDO-780
>             Project: JDO
>          Issue Type: Bug
>          Components: tck
>    Affects Versions: JDO 3.2
>            Reporter: XiangzheXu
>            Assignee: Michael Bouschen
>            Priority: Major
>              Labels: NullPointerException
>             Fix For: JDO 3.2
>
>   Original Estimate: 2h
>  Remaining Estimate: 2h
>
> In class org.apache.jdo.exectck.Utilities, the method `printClasspath()` could throw an unexpected NullPointerException.
> The related part of that method is shown as follows.
> ```java
> public void printClasspath() {
>       ClassLoader loader = ClassLoader.getSystemClassLoader();
>       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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