[hibernate-issues] [Hibernate-JIRA] Commented: (HHH-2947) NPE on initialization of Hibernate

[Pete Grazaitis (JIRA)]

    [ http://opensource.atlassian.com/projects/hibernate/browse/HHH-2947?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_30760 ] 

Pete Grazaitis commented on HHH-2947:
-------------------------------------

Based on the comments in the posts the issue is related to having the Hibernate jar loaded onto the boot classpath.  This results in a null value when calling the getClassLoader.  

I received this error because I had set my User Library in Eclipse to be a "System Library", which places it into the boot classpath.  Changing your User Library in Eclipse via the User Library Manager from System Library to standard library will resolve this issue.

Thanks,

-Pete

> NPE on initialization of Hibernate
> ----------------------------------
>
>                 Key: HHH-2947
>                 URL: http://opensource.atlassian.com/projects/hibernate/browse/HHH-2947
>             Project: Hibernate3
>          Issue Type: Bug
>          Components: core
>    Affects Versions: 3.2.5
>            Reporter: Jörg Heinicke
>            Priority: Minor
>
> There seems to be a rare case when Hibernate fails with a NPE on initialization:
> http://forum.springframework.org/showthread.php?t=46034
> The actual stacktrace is
> Caused by: java.lang.ExceptionInInitializerError
> 	at org.hibernate.cfg.Configuration.reset(Configuration.java:168)
> 	at org.hibernate.cfg.Configuration.<init>(Configuration.java:187)
> 	at org.hibernate.cfg.Configuration.<init>(Configuration.java:191)
> 	...
> Caused by: java.lang.NullPointerException
> 	at org.hibernate.util.ConfigHelper.getResourceAsStream(ConfigHelper.java:144)
> 	at org.hibernate.cfg.Environment.<clinit>(Environment.java:524)
> 	... 26 more
> I don't know exactly which Hibernate version the user used but there seems to be only one potential null pointer in the whole method and this is still in line 144 in the latest code:
> stream = Environment.class.getClassLoader().getResourceAsStream( stripped );
> Class.getClassLoader() is allowed to return null following the Java API: http://java.sun.com/j2se/1.5.0/docs/api/java/lang/Class.html#getClassLoader().
> So you might consider handling this particular case in which it can happen, when Environment.class gets loaded by the bootstrap classloader.

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