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Posted to jdo-dev@db.apache.org by "XiangzheXu (Jira)" <ji...@apache.org> on 2019/08/20 19:29:00 UTC
[jira] [Updated] (JDO-780) Potential NullPointerException in code
[ https://issues.apache.org/jira/browse/JDO-780?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
XiangzheXu updated JDO-780:
---------------------------
Description:
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?
was:
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?
> 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
> Priority: Major
> Labels: NullPointerException
> Original Estimate: 2h
> Remaining Estimate: 2h
>
> 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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