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This project contains Maven archetypes for modular GWT projects using Spring Boot Server

License: Apache License 2.0

Java 66.83% CSS 3.36% HTML 22.61% Shell 7.20%

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cgb-extjs-gwt chenmins cgb-gwt edigonzales craigmit cmcxn happyhua

gwt-maven-springboot-archetype's Issues

fix for finding a correct serializationPolicyFilePath on a temporary web server started by spring boot application

Implement the fix mentioned in this POR #10 by @happyhua

The IDE should be told the source level should use Java 11 or lower syntax

The line:

<maven.compiler.source>17</maven.compiler.source>

https://github.com/NaluKit/gwt-maven-springboot-archetype/blob/main/modular-springboot-webapp/src/main/resources/archetype-resources/pom.xml#L15

Should be:

<maven.compiler.source>11</maven.compiler.source>

This is because GWT can only compile from Java 11 or lower syntax.

We can add:

<properties>
	<maven.compiler.source>17</maven.compiler.source> <!-- The server can use Java 17 syntax -->
</properties>

here https://github.com/NaluKit/gwt-maven-springboot-archetype/blob/main/modular-springboot-webapp/src/main/resources/archetype-resources/__rootArtifactId__-server/pom.xml#L14 to allow the server module to use Java 17 syntax.

Serialization policy error is logged on first RPC call

When you run the app, the first time you press the "Send" button (so it does it's first RPC call), the following error is logged to the server:

INFO: com.mycompany.mywebapp.GreetingServiceImpl: ERROR: The serialization policy file '/mywebapp/469F8017688391FF4CD79514A6FCF659.gwt.rpc' was not found; did you forget to include it in this deployment?
Feb 24, 2024 6:52:41 PM org.apache.catalina.core.ApplicationContext log
INFO: com.mycompany.mywebapp.GreetingServiceImpl: WARNING: Failed to get the SerializationPolicy '469F8017688391FF4CD79514A6FCF659' for module 'http://localhost:8080/mywebapp/'; a legacy, 1.3.3 compatible, serialization policy will be used.  You may experience SerializationExceptions as a result.

The RPC call still works, but this error shouldn't occur.

Notes:

This doesn't happen when pressing the "Send" button with the https://github.com/tbroyer/gwt-maven-archetypes generated code.
If you try to access the /mywebapp/xxx.gwt.rpc file from the browser, you can.
It's odd how it's an INFO log in GreetingServiceImpl, which then says "ERROR".

Crashes when running compiled build (part 2)

Using the same instructions in #13

We still crash:

Caused by: java.nio.file.InvalidPathException: Illegal char <:> at index 20: C:/a/mywebapp/nested:/C:/a/mywebapp/mywebapp-server/target/mywebapp.war/!WEB-INF/classes/!/launcherDir
        at java.base/sun.nio.fs.WindowsPathParser.normalize(WindowsPathParser.java:182)
        at java.base/sun.nio.fs.WindowsPathParser.parse(WindowsPathParser.java:153)
        at java.base/sun.nio.fs.WindowsPathParser.parse(WindowsPathParser.java:77)
        at java.base/sun.nio.fs.WindowsPath.parse(WindowsPath.java:92)
        at java.base/sun.nio.fs.WindowsUriSupport.fromUri(WindowsUriSupport.java:166)
        at java.base/sun.nio.fs.WindowsFileSystemProvider.getPath(WindowsFileSystemProvider.java:98)
        at java.base/java.nio.file.Path.of(Path.java:203)
        at com.mycompany.mywebapp.Application$EmbeddedServletContainerConfig.customize(Application.java:40)
        at com.mycompany.mywebapp.Application$EmbeddedServletContainerConfig.customize(Application.java:32)
        at org.springframework.boot.web.server.WebServerFactoryCustomizerBeanPostProcessor.lambda$postProcessBeforeInitialization$0(WebServerFactoryCustomizerBeanPostProcessor.java:72)
        at org.springframework.boot.util.LambdaSafe$Callbacks.lambda$invoke$0(LambdaSafe.java:287)
        at org.springframework.boot.util.LambdaSafe$LambdaSafeCallback.invoke(LambdaSafe.java:159)
        at org.springframework.boot.util.LambdaSafe$Callbacks.lambda$invoke$1(LambdaSafe.java:286)
        at java.base/java.util.ArrayList.forEach(ArrayList.java:1511)
        at java.base/java.util.Collections$UnmodifiableCollection.forEach(Collections.java:1092)
        at org.springframework.boot.util.LambdaSafe$Callbacks.invoke(LambdaSafe.java:286)
        at org.springframework.boot.web.server.WebServerFactoryCustomizerBeanPostProcessor.postProcessBeforeInitialization(WebServerFactoryCustomizerBeanPostProcessor.java:72)
        at org.springframework.boot.web.server.WebServerFactoryCustomizerBeanPostProcessor.postProcessBeforeInitialization(WebServerFactoryCustomizerBeanPostProcessor.java:58)
        at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.applyBeanPostProcessorsBeforeInitialization(AbstractAutowireCapableBeanFactory.java:422)
        at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1778)
        at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:600)
        ... 23 more

Crashes when running compiled build

Steps to reproduce:

mvn archetype:generate -DarchetypeGroupId=com.github.nalukit.archetype -DarchetypeVersion=LATEST -DarchetypeArtifactId=modular-springboot-webapp

Enter details:

groupId: com.mycompany.mywebapp
artifactId: mywebapp
version: HEAD-SNAPSHOT
package: com.mycompany.mywebapp
module-short-name: mywebapp

cd mywebapp
mvn package
java -jar mywebapp-server/target/mywebapp.war

When trying to run, the following error occurs:

C:\a\mywebapp>java -jar mywebapp-server/target/mywebapp.war

  .   ____          _            __ _ _
 /\\ / ___'_ __ _ _(_)_ __  __ _ \ \ \ \
( ( )\___ | '_ | '_| | '_ \/ _` | \ \ \ \
 \\/  ___)| |_)| | | | | || (_| |  ) ) ) )
  '  |____| .__|_| |_|_| |_\__, | / / / /
 =========|_|==============|___/=/_/_/_/
 :: Spring Boot ::                (v3.2.5)

May 18, 2024 11:55:24 PM org.springframework.boot.StartupInfoLogger logStarting
INFO: Starting Application using Java 17.0.9 with PID 5360 (C:\a\mywebapp\mywebapp-server\target\mywebapp.war started by mail in C:\a\mywebapp)
May 18, 2024 11:55:25 PM org.springframework.boot.SpringApplication logStartupProfileInfo
INFO: No active profile set, falling back to 1 default profile: "default"
May 18, 2024 11:55:25 PM org.springframework.boot.web.embedded.tomcat.TomcatWebServer initialize
INFO: Tomcat initialized with port 8080 (http)
May 18, 2024 11:55:25 PM org.apache.catalina.core.StandardService startInternal
INFO: Starting service [Tomcat]
May 18, 2024 11:55:25 PM org.apache.catalina.core.StandardEngine startInternal
INFO: Starting Servlet engine: [Apache Tomcat/10.1.20]
May 18, 2024 11:55:25 PM org.apache.catalina.core.ContainerBase startInternal
SEVERE: A child container failed during start
java.util.concurrent.ExecutionException: org.apache.catalina.LifecycleException: Failed to start component [org.springframework.boot.web.embedded.tomcat.TomcatServletWebServerFactory$LoaderHidingResourceRoot@2216effc]
        at java.base/java.util.concurrent.FutureTask.report(FutureTask.java:122)
        at java.base/java.util.concurrent.FutureTask.get(FutureTask.java:191)
        at org.apache.catalina.core.ContainerBase.startInternal(ContainerBase.java:873)
        at org.apache.catalina.core.StandardHost.startInternal(StandardHost.java:845)
        at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:171)
        at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1332)
        at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1322)
        at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:264)
        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:866)
        at org.apache.catalina.core.StandardEngine.startInternal(StandardEngine.java:240)
        at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:171)
        at org.apache.catalina.core.StandardService.startInternal(StandardService.java:433)
        at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:171)
        at org.apache.catalina.core.StandardServer.startInternal(StandardServer.java:921)
        at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:171)
        at org.apache.catalina.startup.Tomcat.start(Tomcat.java:437)
        at org.springframework.boot.web.embedded.tomcat.TomcatWebServer.initialize(TomcatWebServer.java:126)
        at org.springframework.boot.web.embedded.tomcat.TomcatWebServer.<init>(TomcatWebServer.java:105)
        at org.springframework.boot.web.embedded.tomcat.TomcatServletWebServerFactory.getTomcatWebServer(TomcatServletWebServerFactory.java:499)
        at org.springframework.boot.web.embedded.tomcat.TomcatServletWebServerFactory.getWebServer(TomcatServletWebServerFactory.java:218)
        at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.createWebServer(ServletWebServerApplicationContext.java:188)
        at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.onRefresh(ServletWebServerApplicationContext.java:162)
        at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:618)
        at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.refresh(ServletWebServerApplicationContext.java:146)
        at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:754)
        at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:456)
        at org.springframework.boot.SpringApplication.run(SpringApplication.java:334)
        at org.springframework.boot.SpringApplication.run(SpringApplication.java:1354)
        at org.springframework.boot.SpringApplication.run(SpringApplication.java:1343)
        at com.mycompany.mywebapp.Application.main(Application.java:21)
        at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:77)
        at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.base/java.lang.reflect.Method.invoke(Method.java:568)
        at org.springframework.boot.loader.launch.Launcher.launch(Launcher.java:91)
        at org.springframework.boot.loader.launch.Launcher.launch(Launcher.java:53)
        at org.springframework.boot.loader.launch.WarLauncher.main(WarLauncher.java:57)
Caused by: org.apache.catalina.LifecycleException: Failed to start component [org.springframework.boot.web.embedded.tomcat.TomcatServletWebServerFactory$LoaderHidingResourceRoot@2216effc]
        at org.apache.catalina.util.LifecycleBase.handleSubClassException(LifecycleBase.java:419)
        at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:186)
        at org.apache.catalina.core.StandardContext.resourcesStart(StandardContext.java:4565)
        at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:4698)
        at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:171)
        at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1332)
        at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1322)
        at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:264)
        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:866)
        ... 36 more
Caused by: java.lang.IllegalArgumentException: The main resource set specified [C:\a\mywebapp\nested:\C:\a\mywebapp\mywebapp-server\target\mywebapp.war\!WEB-INF\classes\!\launcherDir] is not a directory or war file, or is not readable (it does not exist or permissions to access it are missing)
        at org.apache.catalina.webresources.StandardRoot.createMainResourceSet(StandardRoot.java:749)
        at org.springframework.boot.web.embedded.tomcat.TomcatServletWebServerFactory$LoaderHidingResourceRoot.createMainResourceSet(TomcatServletWebServerFactory.java:869)
        at org.apache.catalina.webresources.StandardRoot.startInternal(StandardRoot.java:707)
        at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:171)
        ... 45 more

May 18, 2024 11:55:25 PM org.apache.catalina.core.ContainerBase startInternal
SEVERE: A child container failed during start
java.util.concurrent.ExecutionException: org.apache.catalina.LifecycleException: A child container failed during start
        at java.base/java.util.concurrent.FutureTask.report(FutureTask.java:122)
        at java.base/java.util.concurrent.FutureTask.get(FutureTask.java:191)
        at org.apache.catalina.core.ContainerBase.startInternal(ContainerBase.java:873)
        at org.apache.catalina.core.StandardEngine.startInternal(StandardEngine.java:240)
        at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:171)
        at org.apache.catalina.core.StandardService.startInternal(StandardService.java:433)
        at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:171)
        at org.apache.catalina.core.StandardServer.startInternal(StandardServer.java:921)
        at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:171)
        at org.apache.catalina.startup.Tomcat.start(Tomcat.java:437)
        at org.springframework.boot.web.embedded.tomcat.TomcatWebServer.initialize(TomcatWebServer.java:126)
        at org.springframework.boot.web.embedded.tomcat.TomcatWebServer.<init>(TomcatWebServer.java:105)
        at org.springframework.boot.web.embedded.tomcat.TomcatServletWebServerFactory.getTomcatWebServer(TomcatServletWebServerFactory.java:499)
        at org.springframework.boot.web.embedded.tomcat.TomcatServletWebServerFactory.getWebServer(TomcatServletWebServerFactory.java:218)
        at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.createWebServer(ServletWebServerApplicationContext.java:188)
        at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.onRefresh(ServletWebServerApplicationContext.java:162)
        at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:618)
        at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.refresh(ServletWebServerApplicationContext.java:146)
        at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:754)
        at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:456)
        at org.springframework.boot.SpringApplication.run(SpringApplication.java:334)
        at org.springframework.boot.SpringApplication.run(SpringApplication.java:1354)
        at org.springframework.boot.SpringApplication.run(SpringApplication.java:1343)
        at com.mycompany.mywebapp.Application.main(Application.java:21)
        at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:77)
        at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.base/java.lang.reflect.Method.invoke(Method.java:568)
        at org.springframework.boot.loader.launch.Launcher.launch(Launcher.java:91)
        at org.springframework.boot.loader.launch.Launcher.launch(Launcher.java:53)
        at org.springframework.boot.loader.launch.WarLauncher.main(WarLauncher.java:57)
Caused by: org.apache.catalina.LifecycleException: A child container failed during start
        at org.apache.catalina.core.ContainerBase.startInternal(ContainerBase.java:885)
        at org.apache.catalina.core.StandardHost.startInternal(StandardHost.java:845)
        at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:171)
        at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1332)
        at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1322)
        at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:264)
        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:866)
        ... 28 more
Caused by: java.util.concurrent.ExecutionException: org.apache.catalina.LifecycleException: Failed to start component [org.springframework.boot.web.embedded.tomcat.TomcatServletWebServerFactory$LoaderHidingResourceRoot@2216effc]
        at java.base/java.util.concurrent.FutureTask.report(FutureTask.java:122)
        at java.base/java.util.concurrent.FutureTask.get(FutureTask.java:191)
        at org.apache.catalina.core.ContainerBase.startInternal(ContainerBase.java:873)
        ... 36 more
Caused by: org.apache.catalina.LifecycleException: Failed to start component [org.springframework.boot.web.embedded.tomcat.TomcatServletWebServerFactory$LoaderHidingResourceRoot@2216effc]
        at org.apache.catalina.util.LifecycleBase.handleSubClassException(LifecycleBase.java:419)
        at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:186)
        at org.apache.catalina.core.StandardContext.resourcesStart(StandardContext.java:4565)
        at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:4698)
        at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:171)
        at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1332)
        at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1322)
        at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:264)
        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:866)
        ... 36 more
Caused by: java.lang.IllegalArgumentException: The main resource set specified [C:\a\mywebapp\nested:\C:\a\mywebapp\mywebapp-server\target\mywebapp.war\!WEB-INF\classes\!\launcherDir] is not a directory or war file, or is not readable (it does not exist or permissions to access it are missing)
        at org.apache.catalina.webresources.StandardRoot.createMainResourceSet(StandardRoot.java:749)
        at org.springframework.boot.web.embedded.tomcat.TomcatServletWebServerFactory$LoaderHidingResourceRoot.createMainResourceSet(TomcatServletWebServerFactory.java:869)
        at org.apache.catalina.webresources.StandardRoot.startInternal(StandardRoot.java:707)
        at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:171)
        ... 45 more

May 18, 2024 11:55:25 PM org.apache.catalina.core.StandardService stopInternal
INFO: Stopping service [Tomcat]
May 18, 2024 11:55:25 PM org.springframework.context.support.AbstractApplicationContext refresh
WARNING: Exception encountered during context initialization - cancelling refresh attempt: org.springframework.context.ApplicationContextException: Unable to start web server
May 18, 2024 11:55:25 PM org.springframework.boot.autoconfigure.logging.ConditionEvaluationReportLogger logMessage
INFO:

Error starting ApplicationContext. To display the condition evaluation report re-run your application with 'debug' enabled.
May 18, 2024 11:55:26 PM org.springframework.boot.SpringApplication reportFailure
SEVERE: Application run failed
org.springframework.context.ApplicationContextException: Unable to start web server
        at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.onRefresh(ServletWebServerApplicationContext.java:165)
        at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:618)
        at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.refresh(ServletWebServerApplicationContext.java:146)
        at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:754)
        at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:456)
        at org.springframework.boot.SpringApplication.run(SpringApplication.java:334)
        at org.springframework.boot.SpringApplication.run(SpringApplication.java:1354)
        at org.springframework.boot.SpringApplication.run(SpringApplication.java:1343)
        at com.mycompany.mywebapp.Application.main(Application.java:21)
        at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:77)
        at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.base/java.lang.reflect.Method.invoke(Method.java:568)
        at org.springframework.boot.loader.launch.Launcher.launch(Launcher.java:91)
        at org.springframework.boot.loader.launch.Launcher.launch(Launcher.java:53)
        at org.springframework.boot.loader.launch.WarLauncher.main(WarLauncher.java:57)
Caused by: org.springframework.boot.web.server.WebServerException: Unable to start embedded Tomcat
        at org.springframework.boot.web.embedded.tomcat.TomcatWebServer.initialize(TomcatWebServer.java:145)
        at org.springframework.boot.web.embedded.tomcat.TomcatWebServer.<init>(TomcatWebServer.java:105)
        at org.springframework.boot.web.embedded.tomcat.TomcatServletWebServerFactory.getTomcatWebServer(TomcatServletWebServerFactory.java:499)
        at org.springframework.boot.web.embedded.tomcat.TomcatServletWebServerFactory.getWebServer(TomcatServletWebServerFactory.java:218)
        at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.createWebServer(ServletWebServerApplicationContext.java:188)
        at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.onRefresh(ServletWebServerApplicationContext.java:162)
        ... 15 more
Caused by: org.apache.catalina.LifecycleException: A child container failed during start
        at org.apache.catalina.core.ContainerBase.startInternal(ContainerBase.java:885)
        at org.apache.catalina.core.StandardEngine.startInternal(StandardEngine.java:240)
        at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:171)
        at org.apache.catalina.core.StandardService.startInternal(StandardService.java:433)
        at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:171)
        at org.apache.catalina.core.StandardServer.startInternal(StandardServer.java:921)
        at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:171)
        at org.apache.catalina.startup.Tomcat.start(Tomcat.java:437)
        at org.springframework.boot.web.embedded.tomcat.TomcatWebServer.initialize(TomcatWebServer.java:126)
        ... 20 more
Caused by: java.util.concurrent.ExecutionException: org.apache.catalina.LifecycleException: A child container failed during start
        at java.base/java.util.concurrent.FutureTask.report(FutureTask.java:122)
        at java.base/java.util.concurrent.FutureTask.get(FutureTask.java:191)
        at org.apache.catalina.core.ContainerBase.startInternal(ContainerBase.java:873)
        ... 28 more
Caused by: org.apache.catalina.LifecycleException: A child container failed during start
        at org.apache.catalina.core.ContainerBase.startInternal(ContainerBase.java:885)
        at org.apache.catalina.core.StandardHost.startInternal(StandardHost.java:845)
        at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:171)
        at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1332)
        at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1322)
        at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:264)
        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:866)
        ... 28 more
Caused by: java.util.concurrent.ExecutionException: org.apache.catalina.LifecycleException: Failed to start component [org.springframework.boot.web.embedded.tomcat.TomcatServletWebServerFactory$LoaderHidingResourceRoot@2216effc]
        at java.base/java.util.concurrent.FutureTask.report(FutureTask.java:122)
        at java.base/java.util.concurrent.FutureTask.get(FutureTask.java:191)
        at org.apache.catalina.core.ContainerBase.startInternal(ContainerBase.java:873)
        ... 36 more
Caused by: org.apache.catalina.LifecycleException: Failed to start component [org.springframework.boot.web.embedded.tomcat.TomcatServletWebServerFactory$LoaderHidingResourceRoot@2216effc]
        at org.apache.catalina.util.LifecycleBase.handleSubClassException(LifecycleBase.java:419)
        at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:186)
        at org.apache.catalina.core.StandardContext.resourcesStart(StandardContext.java:4565)
        at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:4698)
        at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:171)
        at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1332)
        at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1322)
        at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:264)
        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:866)
        ... 36 more
Caused by: java.lang.IllegalArgumentException: The main resource set specified [C:\a\mywebapp\nested:\C:\a\mywebapp\mywebapp-server\target\mywebapp.war\!WEB-INF\classes\!\launcherDir] is not a directory or war file, or is not readable (it does not exist or permissions to access it are missing)
        at org.apache.catalina.webresources.StandardRoot.createMainResourceSet(StandardRoot.java:749)
        at org.springframework.boot.web.embedded.tomcat.TomcatServletWebServerFactory$LoaderHidingResourceRoot.createMainResourceSet(TomcatServletWebServerFactory.java:869)
        at org.apache.catalina.webresources.StandardRoot.startInternal(StandardRoot.java:707)
        at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:171)
        ... 45 more

Update GWT version to 2.11.0

create a clean multi module GWT Spring Boot archetype

So, there is no need to remove the sample code.

gwt-servlet is still used referenced

gwt-servlet is still being used in the shared module:

It should be switched to gwt-servlet-jakarta like it is in the server module.

Unnecessary compile args

What does the following do:

<compilerArgs>
  <arg>-gen</arg>
  <arg>${basedir}/target/gwt/gen</arg>
</compilerArgs>

Found here:

If I remove it, it doesn't seem to affect anything.

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