On 29/01/2026 06:11, Rob Sargent wrote:
I am moving an app from tomcat 9.0.100+ to 11.0.5. The conversion tool
worked well and quickly got to a clean compile. At Tomcat.start() I get
a stacktrace mentioning jasper. There are no JSPs in my system:
Looks like you are missing a call to set addDefaultWebXmlToWebapp to
false. The code is the same in 9.0.x and 11.0.x and should be on both
versions. Not sure why you are seeing the difference between 9.0.x and
11.0.x.
Mark
SEVERE: Servlet [jsp] in web application [/sgs] threw load() exception
java.lang.ClassNotFoundException: org.apache.jasper.servlet.JspServlet
at
org.apache.catalina.loader.WebappClassLoaderBase.loadClass(WebappClassLoaderBase.java:1225)
at
org.apache.catalina.loader.WebappClassLoaderBase.loadClass(WebappClassLoaderBase.java:1056)
at
org.apache.catalina.core.DefaultInstanceManager.loadClass(DefaultInstanceManager.java:474)
at
org.apache.catalina.core.DefaultInstanceManager.loadClassMaybePrivileged(DefaultInstanceManager.java:457)
at
org.apache.catalina.core.DefaultInstanceManager.newInstance(DefaultInstanceManager.java:139)
at
org.apache.catalina.core.StandardWrapper.loadServlet(StandardWrapper.java:753)
at
org.apache.catalina.core.StandardWrapper.load(StandardWrapper.java:693)
at
org.apache.catalina.core.StandardContext.loadOnStartup(StandardContext.java:4177)
at
org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:4460)
at
org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:164)
at
org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1162)
at
org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1158)
at
java.base/java.util.concurrent.FutureTask.run(FutureTask.java:317)
at
org.apache.tomcat.util.threads.InlineExecutorService.execute(InlineExecutorService.java:81)
at
java.base/
java.util.concurrent.AbstractExecutorService.submit(AbstractExecutorService.java:145)
at
org.apache.catalina.core.ContainerBase.startInternal(ContainerBase.java:714)
at
org.apache.catalina.core.StandardHost.startInternal(StandardHost.java:780)
at
org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:164)
at
org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1162)
at
org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1158)
at
java.base/java.util.concurrent.FutureTask.run(FutureTask.java:317)
at
org.apache.tomcat.util.threads.InlineExecutorService.execute(InlineExecutorService.java:81)
at
java.base/
java.util.concurrent.AbstractExecutorService.submit(AbstractExecutorService.java:145)
at
org.apache.catalina.core.ContainerBase.startInternal(ContainerBase.java:714)
at
org.apache.catalina.core.StandardEngine.startInternal(StandardEngine.java:201)
at
org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:164)
at
org.apache.catalina.core.StandardService.startInternal(StandardService.java:410)
at
org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:164)
at
org.apache.catalina.core.StandardServer.startInternal(StandardServer.java:864)
at
org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:164)
at org.apache.catalina.startup.Tomcat.start(Tomcat.java:435)
at
edu.utah.camplab.server.SGSSelector.kickOff(SGSSelector.java:186)
at edu.utah.camplab.server.SGSSelector.run(SGSSelector.java:198)
at java.base/java.lang.Thread.run(Thread.java:1583)
where lines 186/186 are:
embeddedTomcat.start();
embeddedTomcat.getServer().await();
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