JAVA 21 - GWT 2.12.0 - Unable to get known Configuration java.util.ServiceConfigurationError

[ibrahimali123]

My Project is running locally correctly, but it gives me this error in the Google app engine logs staging and is not working. I don't know what this error means.

Unable to get known Configuration java.util.ServiceConfigurationError: at org.eclipse.jetty.util.ServiceLoaderSpliterator$ServiceProvider.get(ServiceLoaderSpliterator.java:101) at org.eclipse.jetty.ee8.webapp.Configurations.lambda$getKnown$0(Configurations.java:77) at org.eclipse.jetty.util.ServiceLoaderSpliterator.tryAdvance(ServiceLoaderSpliterator.java:46) at java.base/java.util.Spliterator.forEachRemaining(Spliterator.java:332) at java.base/java.util.stream.ReferencePipeline$Head.forEach(ReferencePipeline.java:762) at org.eclipse.jetty.ee8.webapp.Configurations.getKnown(Configurations.java:75) at org.eclipse.jetty.ee8.webapp.WebAppContext.preConfigure(WebAppContext.java:447) at org.eclipse.jetty.ee8.webapp.WebAppContext.doStart(WebAppContext.java:500) at com.google.apphosting.runtime.jetty.ee8.AppEngineWebAppContext.doStart(AppEngineWebAppContext.java:237) at org.eclipse.jetty.util.component.AbstractLifeCycle.start(AbstractLifeCycle.java:93) at org.eclipse.jetty.util.component.ContainerLifeCycle.start(ContainerLifeCycle.java:169) at org.eclipse.jetty.util.component.ContainerLifeCycle.doStart(ContainerLifeCycle.java:113) at org.eclipse.jetty.server.Handler$Abstract.doStart(Handler.java:491) at org.eclipse.jetty.server.handler.ContextHandler.lambda$doStart$0(ContextHandler.java:754) at org.eclipse.jetty.server.handler.ContextHandler$ScopedContext.call(ContextHandler.java:1452) at org.eclipse.jetty.server.handler.ContextHandler.doStart(ContextHandler.java:754) at org.eclipse.jetty.ee8.nested.ContextHandler$CoreContextHandler.doStart(ContextHandler.java:2269) at org.eclipse.jetty.util.component.AbstractLifeCycle.start(AbstractLifeCycle.java:93) at org.eclipse.jetty.util.component.ContainerLifeCycle.start(ContainerLifeCycle.java:169) at org.eclipse.jetty.util.component.ContainerLifeCycle.addManaged(ContainerLifeCycle.java:482) at org.eclipse.jetty.server.handler.HotSwapHandler.setHandler(HotSwapHandler.java:74) at com.google.apphosting.runtime.jetty.AppVersionHandler.ensureHandler(AppVersionHandler.java:97) at com.google.apphosting.runtime.jetty.JettyServletEngineAdapter.serviceRequest(JettyServletEngineAdapter.java:235) at com.google.apphosting.runtime.RequestRunner.dispatchServletRequest(RequestRunner.java:349) at com.google.apphosting.runtime.RequestRunner.dispatchRequest(RequestRunner.java:234) at com.google.apphosting.runtime.RequestRunner.run(RequestRunner.java:200) at com.google.apphosting.runtime.ThreadGroupPool$PoolEntry.run(ThreadGroupPool.java:273) at java.base/java.lang.Thread.run(Thread.java:1583) Caused by: java.util.ServiceConfigurationError: org.eclipse.jetty.ee8.webapp.Configuration: org.eclipse.jetty.ee8.webapp.WebAppConfiguration not a subtype at java.base/java.util.ServiceLoader.fail(ServiceLoader.java:593) at java.base/java.util.ServiceLoader$LazyClassPathLookupIterator.hasNextService(ServiceLoader.java:1244) at java.base/java.util.ServiceLoader$LazyClassPathLookupIterator.hasNext(ServiceLoader.java:1273) at java.base/java.util.ServiceLoader$2.hasNext(ServiceLoader.java:1309) at java.base/java.util.ServiceLoader$3.hasNext(ServiceLoader.java:1393) at org.eclipse.jetty.util.ServiceLoaderSpliterator.tryAdvance(ServiceLoaderSpliterator.java:37) ... 25 more

I am using gwt-dev 2.12.0 (the latest one) and using jetty-ee8

Here is my appengine-web.xml:
<property name="appengine.use.EE8" value="true"/>

This is a sample from the dependency tree:
+- org.gwtproject:gwt-dev:jar:2.11.0:compile | +- com.google.code.findbugs:jsr305:jar:3.0.2:compile | +- com.google.code.gson:gson:jar:2.6.2:compile | +- org.ow2.asm:asm:jar:9.2:compile | +- org.ow2.asm:asm-util:jar:9.2:compile | | +- org.ow2.asm:asm-tree:jar:9.2:compile | | \- org.ow2.asm:asm-analysis:jar:9.2:compile | +- org.ow2.asm:asm-commons:jar:9.2:compile [INFO] | +- colt:colt:jar:1.2.0:compile [INFO] | +- commons-collections:commons-collections:jar:3.2.2:compile [INFO] | +- commons-io:commons-io:jar:2.4:compile [INFO] | +- com.ibm.icu:icu4j:jar:63.1:compile [INFO] | +- tapestry:tapestry:jar:4.0.2:compile [INFO] | +- org.eclipse.jetty:jetty-webapp:jar:9.4.44.v20210927:compile [INFO] | | +- org.eclipse.jetty:jetty-xml:jar:9.4.44.v20210927:compile [INFO] | | \- org.eclipse.jetty:jetty-servlet:jar:9.4.44.v20210927:compile [INFO] | | +- org.eclipse.jetty:jetty-security:jar:9.4.44.v20210927:compile [INFO] | | | \- org.eclipse.jetty:jetty-server:jar:9.4.44.v20210927:compile [INFO] | | \- org.eclipse.jetty:jetty-util-ajax:jar:9.4.44.v20210927:compile [INFO] | +- org.eclipse.jetty:jetty-servlets:jar:9.4.44.v20210927:compile [INFO] | | +- org.eclipse.jetty:jetty-continuation:jar:9.4.44.v20210927:compile [INFO] | | +- org.eclipse.jetty:jetty-http:jar:9.4.44.v20210927:compile [INFO] | | +- org.eclipse.jetty:jetty-util:jar:9.4.44.v20210927:compile [INFO] | | \- org.eclipse.jetty:jetty-io:jar:9.4.44.v20210927:compile [INFO] | +- org.eclipse.jetty:jetty-annotations:jar:9.4.44.v20210927:compile [INFO] | | +- org.eclipse.jetty:jetty-plus:jar:9.4.44.v20210927:compile [INFO] | | | \- org.eclipse.jetty:jetty-jndi:jar:9.4.44.v20210927:compile [INFO] | | \- javax.annotation:javax.annotation-api:jar:1.3.2:compile [INFO] | \- org.eclipse.jetty:apache-jsp:jar:9.4.44.v20210927:compile [INFO] | +- org.eclipse.jetty.toolchain:jetty-schemas:jar:3.1.2:compile [INFO] | \- org.mortbay.jasper:apache-jsp:jar:8.5.70:compile [INFO] | +- org.mortbay.jasper:apache-el:jar:8.5.70:compile [INFO] | \- org.eclipse.jdt:ecj:jar:3.19.0:compile

Is this because gwt-dev using jetty jars 9.4.44.v20210927?

[niloc132]

I don't think there's enough info here to be 100% certain, but a few points of confusion:

• This dependency tree shows GWT 2.11, but the issue title says 212?
• Is this a new change with GWT a GWT update? What else did you change when this error started?
• You should not have gwt-dev or its dependencies on your server classpath - then these dependencies won't be present when you run your server
• I think org.eclipse.jetty.ee8.webapp.Configuration is a Jetty 12 type? Again, probably means that you are mixing the compiler into the server's classpath, instead of keeping it in the client project only.
• This is the repo for the gwtproject.org website, the GWT project issue tracker is at github.com/gwtproject/gwt - but the mailing list is at https://groups.google.com/g/google-web-toolkit - that is probably the best place for a question like this