Re: What's a sealing violation please?

[Jon Wingfield]

It's part of the core java security model. If a package is sealed within 
a jar then packages of the same name cannot be defined in another jar, 
or elsewhere on the classpath.

Within the manifest file of the jar file which is being loaded by your 
putpr servlet you'll probably have a couple of lines like:

Name: nu/xom
Sealed: true
The XOM jar that I have (xom-1.0d8.jar) doesn't seal its packages. So, 
you need to find the jar which is sealing the nu.xom package and stop it 
doing so. (Or work out your xom dependencies)

Regards,
Jon
Pawson, David wrote:
From the log
2004-11-02 09:24:51 StandardContext[/servlets-examples]SessionListener: 
contextInitialized()
2004-11-02 09:25:52 StandardWrapperValve[putpr]: Servlet.service() for servlet putpr 
threw exception
java.lang.SecurityException: sealing violation: can't seal package nu.xom: already 
loaded
        at java.net.URLClassLoader.defineClass(URLClassLoader.java:234)
        at java.net.URLClassLoader.access$100(URLClassLoader.java:55)
        at java.net.URLClassLoader$1.run(URLClassLoader.java:194)
        at java.security.AccessController.doPrivileged(Native Method)
        at java.net.URLClassLoader.findClass(URLClassLoader.java:187)

Any help appreciated.
Regards DaveP.
**** snip here *****

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