Amit,
On 1/13/25 3:33 PM, Amit Pande wrote:
Hello,
Recently I ran into a very strange issue while deploying the web applications.
The trigger to this issue was adding one more web application (war) under the
given app base. To be precise, moving this application from one app base to
another.
During startup:
java.lang.NoClassDefFoundError: myapp/mypackage/myclass1
at myapp.MyContextListener.contextInitialized(MyAppContextListener.java:27) at
org.apache.catalina.core.StandardContext.listenerStart(StandardContext.java:4008)
at
org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:4436)
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:164) at
org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:599)
at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:571) at
org.apache.catalina.core.StandardHost.addChild(StandardHost.java:654) at
org.apache.catalina.startup.HostConfig.deployWAR(HostConfig.java:969) at
org.apache.catalina.startup.HostConfig$DeployWar.run(HostConfig.java:1911) at
java.lang.NoClassDefFoundError: myapp/mypackage/myclass2
at myapp.MyContextListener.contextInitialized(MyAppContextListener.java:47) at
org.apache.catalina.core.StandardContext.listenerStart(StandardContext.java:4008)
at
org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:4436)
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:164) at
org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:599)
at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:571) at
org.apache.catalina.core.StandardHost.addChild(StandardHost.java:654) at
org.apache.catalina.startup.HostConfig.deployWAR(HostConfig.java:969) at
org.apache.catalina.startup.HostConfig$DeployWar.run(HostConfig.java:1911) at
java.lang.NoClassDefFoundError: myapp/mypackage1/myclass3
at myapp.MyContextListener.contextInitialized(MyAppContextListener.java:37) at
org.apache.catalina.core.StandardContext.listenerStart(StandardContext.java:4008)
at
org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:4436)
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:164) at
org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:599)
at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:571) at
org.apache.catalina.core.StandardHost.addChild(StandardHost.java:654) at
org.apache.catalina.startup.HostConfig.deployWAR(HostConfig.java:969) at
org.apache.catalina.startup.HostConfig$DeployWar.run(HostConfig.java:1911) at
These errors are coming from an app which was already part of the same app
base, which hasn't been changed at all.
And this wasn't reproducible on all the systems consistently. One of my test
setups has 24 cores and around 270GB ran, and this is issue is fairly
consistent on such a configuration. Not sure what's special about it given that
it works on a setup with more than 24 CPU cores.
Little bit of debugging around the "startStopThreads=" setting in server.xml. Both the "Engine" and
"Host" has "startStopThreads=0" which means by default the number of utility threads will be equal
to the number of processors.
For testing purposes, I changed this "startStopThreads=1" and all the
applications were deployed as expected. For now, I have used this workaround.
So, it seems like related to parallel deployment of web applications.
Any input on how to debug this very strange further? FWIW, I am using Java 21
and Tomcat 10.1.34. Also, does it matter that the applications being deployed
might have same set of third-party libraries packaged the war files?
So you could reproduce this like this?
$ cp -R $CATALINA_BASE/webapps/myapp $CATALINA_BASE/webapps/myapp2
... and myapp2 will auto-deploy and throw NoClassDefFoundError(s)?
Are there any other errors in any logs before you see the
NoClassDefFoundError?
If you stop Tomcat and start it again, do both copies of the application
deploy successfully?
-chris
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