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Re: [jetty-users] Webapps not loading after migration from 9.4 to 10.0
We maintain an example project of getting Embedded Jetty and JSP working together at https://github.com/jetty-project/embedded-jetty-jsp

There's Jetty 9, Jetty 10, and Jetty 11 versions (see the branches with the appropriate names).

Then there's also the general cookbook for Embedded Jetty that might help you with specific topics as well.

https://github.com/jetty-project/embedded-jetty-cookbook

As for your specific concerns, you are likely not initializing the JSP layer properly (see first link above to jsp examples), and/or are still using older Configuration (class/object) techniques (see second link above to cookbook examples).

Joakim Erdfelt / joakim@xxxxxxxxxxx


On Wed, Apr 27, 2022 at 10:16 AM Lothar Kimmeringer <job@xxxxxxxxxxxxxx> wrote:
Hi,

we have an appliation that uses Jetty in an embedded way since "the
begin of the world" (the configuration files have had a DTD-declaration
for Jetty 6... ;-)

I'm in the process of migrating from 9.4 to 10.0 and after going the
simple way by replacing the 9.4-jars with the jars of 10.0 the server
is starting up, programmatically added servlets are executed but
WARs loaded by the DeploymentManager lead to errors. I assume that
this simple approach is the reason. When starting up the following
messages show up:

Starting HTTP-server 'Main Server'
16:36:21.005+0200 [main] INFO  org.eclipse.jetty.server.Server - jetty-10.0.9; built: 2022-03-30T16:46:32.527Z; git: a9eaf8d5d73369acf610ce88f850c0d56c4b1113; jvm 11.0.14+9-LTS
16:36:21.008+0200 [main] INFO  o.e.jetty.server.RequestLogWriter - Opened D:\ISDW_4_5\logs\2022_04_27.request.log
16:36:21.037+0200 [main] INFO  o.e.j.d.p.ScanningAppProvider - Deployment monitor [file:///D:/ISDW_4_5/webapps/]
16:36:21.103+0200 [main] INFO  o.e.j.a.AnnotationConfiguration - Error:  for o.e.j.w.WebAppContext@32f1fafe{root,/,file:///D:/ISDW_4_5/webapps/root/,STARTING}{D:\ISDW_4_5\webapps\root}
16:36:21.107+0200 [main] INFO  o.e.j.a.AnnotationConfiguration - Error:  for o.e.j.w.WebAppContext@32f1fafe{root,/,file:///D:/ISDW_4_5/webapps/root/,STARTING}{D:\ISDW_4_5\webapps\root}
16:36:21.112+0200 [main] INFO  o.e.j.w.StandardDescriptorProcessor - NO JSP Support for /, did not find org.eclipse.jetty.jsp.JettyJspServlet
16:36:21.129+0200 [main] WARN  org.eclipse.jetty.servlet.BaseHolder - Unable to load class org.eclipse.jetty.servlet.listener.ELContextCleaner
java.lang.ClassNotFoundException: org.eclipse.jetty.servlet.listener.ELContextCleaner
         at org.eclipse.jetty.webapp.WebAppClassLoader.loadClass(WebAppClassLoader.java:531)
[...]
16:36:21.133+0200 [main] WARN  o.eclipse.jetty.webapp.WebAppContext - Failed startup of context o.e.j.w.WebAppContext@32f1fafe{root,/,file:///D:/ISDW_4_5/webapps/root/,UNAVAILABLE}{D:\ISDW_4_5\webapps\root}
javax.servlet.UnavailableException: Class loading error for holder org.eclipse.jetty.servlet.listener.ELContextCleaner@7061622{src="">          at org.eclipse.jetty.servlet.BaseHolder.doStart(BaseHolder.java:104)
[...]
16:36:21.159+0200 [main] INFO  o.e.jetty.server.AbstractConnector - Started ServerConnector@5d152bcd{HTTP/1.1, (http/1.1)}{0.0.0.0:80}
16:36:21.183+0200 [main] INFO  org.eclipse.jetty.server.Server - Started Main Server @30804ms

I'm wondering about the claim that JettyJspServlet and ELContextCleaner can't be
found. Both are in the classpath and can be found in the class starting the server
(checked with Class.forName).

What's the best way to embed Jetty 10? Resources online I've found only
cover Jetty up to version 9. The online documentation (Operation
and Programming don't mention Embedding at all - at least in the TOC).


Thanks and best regards,

Lothar Kimmeringer
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