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Re: [jetty-users] 'Could not instantiate listener' error on Android Studio
Also, since you are using Jetty 8, be sure to not run Java 9 (its not supported on Jetty 8 due to JEP 238 & JPMS changes to the JVM)
For maximum compatibility with Jetty 8.1.15 you should probably stick to Java 7.


Joakim Erdfelt / joakim@xxxxxxxxxxx

On Fri, Feb 2, 2018 at 8:39 AM, Joakim Erdfelt <joakim@xxxxxxxxxxx> wrote:
Jetty 8 is EOL (End of Life)

Without knowing how the Android Studio instance of Jetty was started, it would be hard to troubleshoot.
If this was a distribution started version of Jetty, then its likely missing a distribution option to enable (and configure) for JSPs.


Joakim Erdfelt / joakim@xxxxxxxxxxx

On Fri, Feb 2, 2018 at 8:32 AM, Nicoleta Sarbu <sarbu.a.nicoleta@xxxxxxxxx> wrote:
Hi,

I moved a project from Eclipse to Android Studio that inlcudes jetty-8.1.15.jar for Android and I have this error on the server side (service unavailable):

W/System.err: 2018-02-02 15:45:40.238:WARN:oejw.StandardDescriptorProcessor:Could not instantiate listener org.eclipse.jetty.servlet.listener.ELContextCleaner
W/System.err: java.lang.NullPointerException: throw with null exception
W/System.err:     at java.net.URLClassLoader.findClass(URLClassLoader.java:371)
W/System.err:     at org.eclipse.jetty.webapp.WebAppClassLoader.loadClass(WebAppClassLoader.java:421)
W/System.err:     at org.eclipse.jetty.webapp.WebAppClassLoader.loadClass(WebAppClassLoader.java:383)
W/System.err:     at org.eclipse.jetty.server.handler.ContextHandler.loadClass(ContextHandler.java:1528)
W/System.err:     at org.eclipse.jetty.webapp.StandardDescriptorProcessor.visitListener(StandardDescriptorProcessor.java:1893)
W/System.err:     at java.lang.reflect.Method.invoke(Native Method)
W/System.err:     at org.eclipse.jetty.webapp.IterativeDescriptorProcessor.visit(IterativeDescriptorProcessor.java:85)
W/System.err:     at org.eclipse.jetty.webapp.IterativeDescriptorProcessor.process(IterativeDescriptorProcessor.java:72)
W/System.err:     at org.eclipse.jetty.webapp.MetaData.resolve(MetaData.java:366)
W/System.err:     at org.eclipse.jetty.webapp.WebAppContext.startContext(WebAppContext.java:1240)
W/System.err:     at org.eclipse.jetty.server.handler.ContextHandler.doStart(ContextHandler.java:717)
W/System.err:     at org.eclipse.jetty.webapp.WebAppContext.doStart(WebAppContext.java:494)
W/System.err:     at org.eclipse.jetty.util.component.AbstractLifeCycle.start(AbstractLifeCycle.java:64)
W/System.err:     at org.eclipse.jetty.server.handler.HandlerWrapper.doStart(HandlerWrapper.java:95)
W/System.err:     at org.eclipse.jetty.server.Server.doStart(Server.java:282)
W/System.err:     at org.eclipse.jetty.util.component.AbstractLifeCycle.start(AbstractLifeCycle.java:64)

The library is added as a dependency. Is there any other setup that needs to be done?

Thank you


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