Webapp fails to start with jakarta.faces.AUTOMATIC_EXTENSIONLESS_MAPPING set to true

[jansohn]

Describe the bug

I'm trying to deploy my web application on Tomcat 10.1 with Mojarra 4.0.x. Everything works if I use a webapp context like '/manager' (WAR file name manager.war) but fails if I rename the WAR to ROOT.war (empty/root webapp context '/').

16-Aug-2024 17:19:29.808 INFO [main] com.sun.faces.config.ConfigureListener.contextInitialized Initializing Mojarra 4.0.7 for context ''
16-Aug-2024 17:19:29.977 INFO [main] com.sun.faces.spi.InjectionProviderFactory.createInstance JSF1048: PostConstruct/PreDestroy annotations present.  ManagedBeans methods marked with these annotations will have said annotations processed.
16-Aug-2024 17:19:30.634 SEVERE [main] com.sun.faces.config.ConfigureListener.contextInitialized Critical error during deployment:
        java.lang.NullPointerException: Cannot invoke "java.util.Collection.size()" because "c" is null
                at java.base/java.util.ArrayDeque.addAll(ArrayDeque.java:321)
                at com.sun.faces.application.resource.ResourcePathsIterator.visit(ResourcePathsIterator.java:67)
                at com.sun.faces.application.resource.ResourcePathsIterator.tryTake(ResourcePathsIterator.java:79)
                at com.sun.faces.application.resource.ResourcePathsIterator.hasNext(ResourcePathsIterator.java:51)
                at java.base/java.util.Iterator.forEachRemaining(Iterator.java:132)
                at java.base/java.util.Spliterators$IteratorSpliterator.forEachRemaining(Spliterators.java:1939)
                at java.base/java.util.stream.Streams$ConcatSpliterator.forEachRemaining(Streams.java:734)
                at java.base/java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:509)
                at java.base/java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:499)
                at java.base/java.util.stream.ForEachOps$ForEachOp.evaluateSequential(ForEachOps.java:151)
                at java.base/java.util.stream.ForEachOps$ForEachOp$OfRef.evaluateSequential(ForEachOps.java:174)
                at java.base/java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234)
                at java.base/java.util.stream.ReferencePipeline.forEach(ReferencePipeline.java:596)
                at java.base/java.util.stream.ReferencePipeline$7$1.accept(ReferencePipeline.java:276)
                at java.base/java.util.Spliterators$ArraySpliterator.forEachRemaining(Spliterators.java:1024)
                at java.base/java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:509)
                at java.base/java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:499)
                at java.base/java.util.stream.ForEachOps$ForEachOp.evaluateSequential(ForEachOps.java:151)
                at java.base/java.util.stream.ForEachOps$ForEachOp$OfRef.evaluateSequential(ForEachOps.java:174)
                at java.base/java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234)
                at java.base/java.util.stream.ReferencePipeline.forEach(ReferencePipeline.java:596)
                at com.sun.faces.application.ApplicationAssociate$PostConstructApplicationListener.lambda$processEvent$1(ApplicationAssociate.java:325)
                at java.base/java.util.Optional.ifPresent(Optional.java:178)
                at com.sun.faces.application.ApplicationAssociate$PostConstructApplicationListener.processEvent(ApplicationAssociate.java:323)
                at jakarta.faces.event.SystemEvent.processListener(SystemEvent.java:124)
                at com.sun.faces.application.applicationimpl.Events.processListeners(Events.java:242)
                at com.sun.faces.application.applicationimpl.Events.invokeListenersFor(Events.java:221)
                at com.sun.faces.application.applicationimpl.Events.publishEvent(Events.java:104)
                at com.sun.faces.application.ApplicationImpl.publishEvent(ApplicationImpl.java:118)
                at jakarta.faces.application.ApplicationWrapper.publishEvent(ApplicationWrapper.java:672)
                at jakarta.faces.application.ApplicationWrapper.publishEvent(ApplicationWrapper.java:672)
                at com.sun.faces.config.ConfigManager.publishPostConfigEvent(ConfigManager.java:433)
                at com.sun.faces.config.ConfigureListener.contextInitialized(ConfigureListener.java:233)
                at org.apache.catalina.core.StandardContext.listenerStart(StandardContext.java:3995)
                at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:4424)
                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$DeployWar.run(HostConfig.java:1911)
                at java.base/java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:572)
                at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:317)
                at org.apache.tomcat.util.threads.InlineExecutorService.execute(InlineExecutorService.java:75)
                at java.base/java.util.concurrent.AbstractExecutorService.submit(AbstractExecutorService.java:123)
                at org.apache.catalina.startup.HostConfig.deployWARs(HostConfig.java:771)
                at org.apache.catalina.startup.HostConfig.deployApps(HostConfig.java:423)
                at org.apache.catalina.startup.HostConfig.start(HostConfig.java:1629)
                at org.apache.catalina.startup.HostConfig.lifecycleEvent(HostConfig.java:303)
                at org.apache.catalina.util.LifecycleBase.fireLifecycleEvent(LifecycleBase.java:109)
                at org.apache.catalina.util.LifecycleBase.setStateInternal(LifecycleBase.java:385)
                at org.apache.catalina.util.LifecycleBase.setState(LifecycleBase.java:332)
                at org.apache.catalina.core.ContainerBase.startInternal(ContainerBase.java:776)
                at org.apache.catalina.core.StandardHost.startInternal(StandardHost.java:772)
                at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:164)
                at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1203)
                at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1193)
                at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:317)
                at org.apache.tomcat.util.threads.InlineExecutorService.execute(InlineExecutorService.java:75)
                at java.base/java.util.concurrent.AbstractExecutorService.submit(AbstractExecutorService.java:145)
                at org.apache.catalina.core.ContainerBase.startInternal(ContainerBase.java:749)
                at org.apache.catalina.core.StandardEngine.startInternal(StandardEngine.java:203)
                at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:164)
                at org.apache.catalina.core.StandardService.startInternal(StandardService.java:415)
                at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:164)
                at org.apache.catalina.core.StandardServer.startInternal(StandardServer.java:874)
                at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:164)
                at org.apache.catalina.startup.Catalina.start(Catalina.java:757)
                at java.base/jdk.internal.reflect.DirectMethodHandleAccessor.invoke(DirectMethodHandleAccessor.java:103)
                at java.base/java.lang.reflect.Method.invoke(Method.java:580)
                at org.apache.catalina.startup.Bootstrap.start(Bootstrap.java:345)
                at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:473)

To Reproduce

Steps to reproduce the behavior:

1. Deploy ROOT.war on Tomcat 10.1 with Mojarra 4.0.x

Expected behavior

no startup failures

[jansohn]

After further tests this has nothing to do with deploying on root context or not. The webapp runs when started in a Tomcat container in Eclipse but fails if I package the WAR file and deploy it on a standalone Tomcat instance. I'll close and open a StackOverflow question instead...

[jansohn]

This is somehow caused by

<context-param>
    <param-name>jakarta.faces.AUTOMATIC_EXTENSIONLESS_MAPPING</param-name>
    <param-value>true</param-value>
</context-param>

If I set this to false then the application starts up correctly.

My complete web.xml for reference:

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns="https://jakarta.ee/xml/ns/jakartaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="https://jakarta.ee/xml/ns/jakartaee 
            https://jakarta.ee/xml/ns/jakartaee/web-app_6_0.xsd" version="6.0">
    <display-name>Test_Webapp</display-name>

    <context-param>
        <param-name>primefaces.THEME</param-name>
        <param-value>test-blue-grey</param-value>
    </context-param>

    <context-param>
        <param-name>jakarta.faces.PROJECT_STAGE</param-name>
        <param-value>Production</param-value>
    </context-param>

    <context-param>
        <param-name>jakarta.faces.AUTOMATIC_EXTENSIONLESS_MAPPING</param-name>
        <param-value>true</param-value>
    </context-param>

    <context-param>
        <param-name>jakarta.faces.CLIENT_WINDOW_MODE</param-name>
        <param-value>url</param-value>
    </context-param>

    <welcome-file-list>
        <welcome-file>index.xhtml</welcome-file>
    </welcome-file-list>

    <listener>
        <listener-class>com.test.view.util.ApplicationContextListener</listener-class>
    </listener>

    <!-- https://github.com/eclipse-ee4j/mojarra/blob/4.0/README.md#controller -->
    <servlet>
        <servlet-name>facesServlet</servlet-name>
        <servlet-class>jakarta.faces.webapp.FacesServlet</servlet-class>
    </servlet>
    <servlet-mapping>
        <servlet-name>facesServlet</servlet-name>
        <url-pattern>*.xhtml</url-pattern>
    </servlet-mapping>

    <session-config>
        <session-timeout>120</session-timeout>
    </session-config>
</web-app>

[BalusC]

I copypasted your web.xml into an empty project targeted at Tomcat 10.1.23 having solely a index.xhtml (the project is of course not literally empty it's just the smallest possible project for a working Faces 4.0 app on Tomcat -- I used Weld as CDI impl btw)
Deployment immediately failed with java.lang.ClassNotFoundException: com.test.view.util.ApplicationContextListener.
After removing the com.test.view.util.ApplicationContextListener entry from web.xml it deploys fine.

The described issue is not reproducible based on the information provided so far.
Please make sure this is the case.
Try doing the same, start with the smallest possible project or try removing code/config from your project until it works ;)