Hi all,
I was successfully monitoring cron jobs using the “External Monitor Job
Type Plugin” with Jenkins.1.65.
I just upgraded to Jenkins 2.51, extracted the jar files from the war file
as instructed on the plugin wiki page, and copied them to the remote system
where the cron job runs, just as I did with the previous Jenkins version.
My main Jenkins is running on java 1.8 and
the remote system has java 1.7.0_131.
Now however, the plugin doesn’t work, it fails with this trace:
Exception in thread "main" java.lang.NoClassDefFoundError:
javax/servlet/ServletContextListener
at java.lang.ClassLoader.defineClass1(Native Method)
at java.lang.ClassLoader.defineClass(ClassLoader.java:803)
at
java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142)
at
java.net.URLClassLoader.defineClass(URLClassLoader.java:442)
at
java.net.URLClassLoader.access$100(URLClassLoader.java:64)
at java.net.URLClassLoader$1.run(URLClassLoader.java:354)
at java.net.URLClassLoader$1.run(URLClassLoader.java:348)
at java.security.AccessController.doPrivileged(Native
Method)
at
java.net.URLClassLoader.findClass(URLClassLoader.java:347)
at java.lang.ClassLoader.loadClass(ClassLoader.java:425)
at
sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:308)
at java.lang.ClassLoader.loadClass(ClassLoader.java:358)
at hudson.Main.<clinit>(Main.java:222)
Caused by: java.lang.ClassNotFoundException:
javax.servlet.ServletContextListener
at java.net.URLClassLoader$1.run(URLClassLoader.java:359)
at java.net.URLClassLoader$1.run(URLClassLoader.java:348)
at java.security.AccessController.doPrivileged(Native
Method)
at
java.net.URLClassLoader.findClass(URLClassLoader.java:347)
at java.lang.ClassLoader.loadClass(ClassLoader.java:425)
at
sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:308)
at java.lang.ClassLoader.loadClass(ClassLoader.java:358)
... 13 more
>From google I learn that ServletContextListener is in the servlet api which
does not appear to be present on the system, and it is not listed as a
requirement of the plugin. Anyway I found the servlet-api-2.5.jar
available online and tried putting it in the same directory as the other
jar files, but the same error occurs.
My question is how do I make this work, and should I report this as a bug
to the plugin maintainer, or is it some kind of setup mistake I have made?
Thanks
Adrian
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