Re: [jetty-users] Class loading issue on upgrade to Jetty 12

[Greg Wilkins <gregw@xxxxxxxxxxx>]

You need to exclude the class from HiddenClasses and add it to Protected classes.  You should also make sure that the jar is not in WEB-INF/lib

If you can't get it to work open an question issue with your classpath and a server dump

cheers

On Mon, 18 Nov 2024 at 07:24, Josh Spiegel via jetty-users <jetty-users@xxxxxxxxxxx> wrote:

Hi, 

I'm trying to migrate from Jetty 10 to Jetty 12.  I have a servlet that access ServerConnector and it has started producing this error:

Caused by:java.lang.LinkageError: loader constraint violation: loader org.eclipse.jetty.ee8.webapp.WebAppClassLoader @74ebd159 wants to load class org.eclipse.jetty.server.ServerConnector. A different class with the same name was previously loaded by 'app'. (org.eclipse.jetty.server.ServerConnector is in unnamed module of loader 'app')

at java.base/java.lang.ClassLoader.defineClass1(Native Method)
at java.base/java.lang.ClassLoader.defineClass(ClassLoader.java:1017)
at java.base/java.security.SecureClassLoader.defineClass(SecureClassLoader.java:150)
at java.base/java.net.URLClassLoader.defineClass(URLClassLoader.java:524)
at java.base/java.net.URLClassLoader$1.run(URLClassLoader.java:427)
at java.base/java.net.URLClassLoader$1.run(URLClassLoader.java:421)
at java.base/java.security.AccessController.doPrivileged(AccessController.java:712)
at java.base/java.net.URLClassLoader.findClass(URLClassLoader.java:420)
at org.eclipse.jetty.ee8.webapp.WebAppClassLoader.findClass(WebAppClassLoader.java:446)
at org.eclipse.jetty.ee8.webapp.WebAppClassLoader.loadClass(WebAppClassLoader.java:372)
at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:525)

I've tried playing with WebAppContext.addHiddenClasses and addProtectedClasses but I'm not having any luck. 

What is the best way to give my severlet access to these server classes?

Thanks,

Josh

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Greg Wilkins <gregw@xxxxxxxxxxx> CTO http://webtide.com