SpringBoot WebSocket auto-configuration throws a CNFE with Jetty 10.0.5 (same as #26847)

When using Jetty version 10.0.5 and Java 11 with Spring Boot 2.5.6 .. .9 or 2.6.0 still the in #26847 described problem occures.

To reproduce the failure the existing setup description of the #26847 thread should be sufficient. I also created a pom.xml from https://start.spring.io/ and added the jetty 10.0.5 version to the properties tag (and some additional dependencies).

pom.xml:

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"

    xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <packaging>jar</packaging>
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.5.9</version>
        <!-- relativePath/> lookup parent from repository -->
    </parent>
    <groupId>group</groupId>
    <artifactId>example-spring</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>abc</name>
    <description>Demo project for Spring Boot</description>
    <properties>
        <java.version>11</java.version>
        <spring-cloud.version>2020.0.4</spring-cloud.version>
        <jetty.version>10.0.5</jetty.version>
    </properties>

    <dependencies>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
            <exclusions>
                <exclusion>
                    <groupId>org.springframework.boot</groupId>
                    <artifactId>spring-boot-starter-tomcat</artifactId>
                </exclusion>
            </exclusions>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-jetty</artifactId>
        </dependency>

        <!-- https://mvnrepository.com/artifact/org.eclipse.jetty.websocket/websocket-javax-server -->
        <dependency>
            <groupId>org.eclipse.jetty.websocket</groupId>
            <artifactId>websocket-javax-server</artifactId>
        </dependency>

        <dependency>
            <groupId>org.eclipse.jetty.websocket</groupId>
            <artifactId>websocket-core-server</artifactId>
        </dependency>

        <dependency>
          <groupId>org.eclipse.jetty.websocket</groupId>
          <artifactId>websocket-javax-client</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-jersey</artifactId>
            <exclusions>
                <exclusion>
                    <groupId>org.springframework.boot</groupId>
                    <artifactId>spring-boot-starter-tomcat</artifactId>
                </exclusion>
            </exclusions>
        </dependency>

        <dependency>
            <groupId>com.netflix.graphql.dgs</groupId>
            <artifactId>graphql-dgs-spring-boot-starter</artifactId>
        </dependency>

        <!-- https://mvnrepository.com/artifact/junit/junit -->
        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>4.13.2</version>
            <scope>test</scope>
        </dependency>

</dependencies>


<dependencyManagement>
    <dependencies>

        <dependency>
            <groupId>com.netflix.graphql.dgs</groupId>
            <artifactId>graphql-dgs-platform-dependencies</artifactId>
            <!-- The DGS BOM/platform dependency. This is the only place you set version of DGS -->
            <version>4.9.16</version>
            <type>pom</type>
            <scope>import</scope>
        </dependency>

    </dependencies>
</dependencyManagement>

        <build>
            <plugins>

                <plugin>
                    <groupId>org.codehaus.mojo</groupId>
                    <artifactId>build-helper-maven-plugin</artifactId>
                    <version>1.12</version>
                    <executions>
                        <execution>
                            <phase>generate-sources</phase>
                            <goals>
                                <goal>add-source</goal>
                            </goals>
                            <configuration>
                                <sources>
                                    <source>src/example/java</source>
                                </sources>
                            </configuration>
                        </execution>
                    </executions>
                </plugin>


                <plugin>
                    <groupId>org.springframework.boot</groupId>
                    <artifactId>spring-boot-maven-plugin</artifactId>
                </plugin>
            </plugins>
        </build>


</project>

org.springframework.context.ApplicationContextException: Unable to start web server; nested exception is org.springframework.boot.web.server.WebServerException: Unable to start embedded Jetty web server
at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.onRefresh(ServletWebServerApplicationContext.java:163) ~[spring-boot-2.6.0.jar:2.6.0]
at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:577) ~[spring-context-5.3.13.jar:5.3.13]
at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.refresh(ServletWebServerApplicationContext.java:145) ~[spring-boot-2.6.0.jar:2.6.0]
at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:730) ~[spring-boot-2.6.0.jar:2.6.0]
at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:412) ~[spring-boot-2.6.0.jar:2.6.0]
at org.springframework.boot.SpringApplication.run(SpringApplication.java:302) ~[spring-boot-2.6.0.jar:2.6.0]
at org.springframework.boot.SpringApplication.run(SpringApplication.java:1301) ~[spring-boot-2.6.0.jar:2.6.0]
at org.springframework.boot.SpringApplication.run(SpringApplication.java:1290) ~[spring-boot-2.6.0.jar:2.6.0]
at com.tunnelsoft.mobile.tpc.spring.TpcBackboneSpringApplication.main(TpcBackboneSpringApplication.java:15) ~[classes/:na]
Caused by: org.springframework.boot.web.server.WebServerException: Unable to start embedded Jetty web server
at org.springframework.boot.web.embedded.jetty.JettyWebServer.initialize(JettyWebServer.java:129) ~[spring-boot-2.6.0.jar:2.6.0]
at org.springframework.boot.web.embedded.jetty.JettyWebServer.(JettyWebServer.java:90) ~[spring-boot-2.6.0.jar:2.6.0]
at org.springframework.boot.web.embedded.jetty.JettyServletWebServerFactory.getJettyWebServer(JettyServletWebServerFactory.java:447) ~[spring-boot-2.6.0.jar:2.6.0]
at org.springframework.boot.web.embedded.jetty.JettyServletWebServerFactory.getWebServer(JettyServletWebServerFactory.java:181) ~[spring-boot-2.6.0.jar:2.6.0]
at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.createWebServer(ServletWebServerApplicationContext.java:182) ~[spring-boot-2.6.0.jar:2.6.0]
at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.onRefresh(ServletWebServerApplicationContext.java:160) ~[spring-boot-2.6.0.jar:2.6.0]
... 8 common frames omitted
Caused by: java.lang.NoClassDefFoundError: org/eclipse/jetty/websocket/servlet/WebSocketCreator
at java.base/java.lang.ClassLoader.defineClass1(Native Method) ~[na:na]
at java.base/java.lang.ClassLoader.defineClass(ClassLoader.java:1016) ~[na:na]
at java.base/java.security.SecureClassLoader.defineClass(SecureClassLoader.java:174) ~[na:na]
at java.base/jdk.internal.loader.BuiltinClassLoader.defineClass(BuiltinClassLoader.java:802) ~[na:na]
at java.base/jdk.internal.loader.BuiltinClassLoader.findClassOnClassPathOrNull(BuiltinClassLoader.java:700) ~[na:na]
at java.base/jdk.internal.loader.BuiltinClassLoader.loadClassOrNull(BuiltinClassLoader.java:623) ~[na:na]
at java.base/jdk.internal.loader.BuiltinClassLoader.loadClass(BuiltinClassLoader.java:581) ~[na:na]
at java.base/jdk.internal.loader.ClassLoaders$AppClassLoader.loadClass(ClassLoaders.java:178) ~[na:na]
at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:521) ~[na:na]
at org.eclipse.jetty.websocket.server.NativeWebSocketConfiguration.(NativeWebSocketConfiguration.java:50) ~[websocket-server-9.4.44.v20210927.jar:9.4.44.v20210927]
at org.eclipse.jetty.websocket.server.NativeWebSocketServletContainerInitializer.initialize(NativeWebSocketServletContainerInitializer.java:63) ~[websocket-server-9.4.44.v20210927.jar:9.4.44.v20210927]
at org.eclipse.jetty.websocket.jsr356.server.deploy.WebSocketServerContainerInitializer.initialize(WebSocketServerContainerInitializer.java:196) ~[javax-websocket-server-impl-9.4.44.v20210927.jar:9.4.44.v20210927]
at org.springframework.boot.autoconfigure.websocket.servlet.JettyWebSocketServletWebServerCustomizer$1.configure(JettyWebSocketServletWebServerCustomizer.java:46) ~[spring-boot-autoconfigure-2.6.0.jar:2.6.0]
at org.eclipse.jetty.webapp.Configurations.configure(Configurations.java:508) ~[jetty-webapp-10.0.5.jar:10.0.5]
at org.eclipse.jetty.webapp.WebAppContext.configure(WebAppContext.java:514) ~[jetty-webapp-10.0.5.jar:10.0.5]
at org.eclipse.jetty.webapp.WebAppContext.startContext(WebAppContext.java:1300) ~[jetty-webapp-10.0.5.jar:10.0.5]
at org.eclipse.jetty.server.handler.ContextHandler.doStart(ContextHandler.java:890) ~[jetty-server-10.0.5.jar:10.0.5]
at org.eclipse.jetty.servlet.ServletContextHandler.doStart(ServletContextHandler.java:306) ~[jetty-servlet-10.0.5.jar:10.0.5]
at org.eclipse.jetty.webapp.WebAppContext.doStart(WebAppContext.java:532) ~[jetty-webapp-10.0.5.jar:10.0.5]
at org.eclipse.jetty.util.component.AbstractLifeCycle.start(AbstractLifeCycle.java:93) ~[jetty-util-10.0.5.jar:10.0.5]
at org.eclipse.jetty.util.component.ContainerLifeCycle.start(ContainerLifeCycle.java:171) ~[jetty-util-10.0.5.jar:10.0.5]
at org.eclipse.jetty.server.Server.start(Server.java:469) ~[jetty-server-10.0.5.jar:10.0.5]
at org.eclipse.jetty.util.component.ContainerLifeCycle.doStart(ContainerLifeCycle.java:114) ~[jetty-util-10.0.5.jar:10.0.5]
at org.eclipse.jetty.server.handler.AbstractHandler.doStart(AbstractHandler.java:89) ~[jetty-server-10.0.5.jar:10.0.5]
at org.eclipse.jetty.server.Server.doStart(Server.java:414) ~[jetty-server-10.0.5.jar:10.0.5]
at org.eclipse.jetty.util.component.AbstractLifeCycle.start(AbstractLifeCycle.java:93) ~[jetty-util-10.0.5.jar:10.0.5]
at org.springframework.boot.web.embedded.jetty.JettyWebServer.initialize(JettyWebServer.java:123) ~[spring-boot-2.6.0.jar:2.6.0]
... 13 common frames omitted
Caused by: java.lang.ClassNotFoundException: org.eclipse.jetty.websocket.servlet.WebSocketCreator
at java.base/jdk.internal.loader.BuiltinClassLoader.loadClass(BuiltinClassLoader.java:583) ~[na:na]
at java.base/jdk.internal.loader.ClassLoaders$AppClassLoader.loadClass(ClassLoaders.java:178) ~[na:na]
at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:521) ~[na:na]
... 40 common frames omitted

Comment From: wilkinsona

You haven’t configured the necessary exclusions. #29275 is tracking adding them to the reference documentation.