[JDO-780] Potential NullPointerException in code

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: JDO 3.2
• Fix Version/s: JDO 3.2
• Component/s: tck
• Labels: NullPointerException
• Assignee: Michael Bouschen
• Reporter: XiangzheXu
• Created: 20/Aug/19 19:28
• Updated: 17/Feb/22 19:54
• Resolved: 31/Aug/19 20:29

Description

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?