NoSuchMethodError: org.eclipse.jetty.websocket.server.WebSocketServerFactory.(Ljavax/servlet/ServletContext;)V

Question

I have this exception when launching my application via eclipse plugin: "Run as" > "GWT Development Mode with jetty"

Environment:
- GWT SDK 2.8
- spring-boot 1.5.2.RELEASE
- jetty 9.4.2
- GWT Eclipse Plugin 3.0.0

Context: migrate a GWT 2.6 application to GWT 2.8 and using spring-boot
application pom generated with GWT webAppCreator

Here is the stack trace:

**Exception in thread "main" java.lang.NoSuchMethodError: 
org.eclipse.jetty.websocket.server.WebSocketServerFactory.<init>(Ljavax/servlet/ServletContext;)V**
at org.eclipse.jetty.websocket.server.NativeWebSocketConfiguration.<init>(NativeWebSocketConfiguration.java:53)
at org.eclipse.jetty.websocket.server.NativeWebSocketServletContainerInitializer.getDefaultFrom(NativeWebSocketServletContainerInitializer.java:36)
at org.eclipse.jetty.websocket.server.NativeWebSocketServletContainerInitializer.onStartup(NativeWebSocketServletContainerInitializer.java:46)
at org.eclipse.jetty.plus.annotation.ContainerInitializer.callStartup(ContainerInitializer.java:140)
at org.eclipse.jetty.annotations.ServletContainerInitializersStarter.doStart(ServletContainerInitializersStarter.java:63)
at org.eclipse.jetty.util.component.AbstractLifeCycle.start(AbstractLifeCycle.java:68)
at org.eclipse.jetty.servlet.ServletContextHandler.startContext(ServletContextHandler.java:329)
at org.eclipse.jetty.webapp.WebAppContext.startWebapp(WebAppContext.java:1480)
at org.eclipse.jetty.webapp.WebAppContext.startContext(WebAppContext.java:1442)
at org.eclipse.jetty.server.handler.ContextHandler.doStart(ContextHandler.java:799)
at org.eclipse.jetty.servlet.ServletContextHandler.doStart(ServletContextHandler.java:261)
at org.eclipse.jetty.webapp.WebAppContext.doStart(WebAppContext.java:540)
at com.google.gwt.dev.shell.jetty.JettyLauncher$WebAppContextWithReload.doStart(JettyLauncher.java:550)
at org.eclipse.jetty.util.component.AbstractLifeCycle.start(AbstractLifeCycle.java:68)
at org.eclipse.jetty.util.component.ContainerLifeCycle.start(ContainerLifeCycle.java:131)
at org.eclipse.jetty.util.component.ContainerLifeCycle.doStart(ContainerLifeCycle.java:105)
at org.eclipse.jetty.server.handler.AbstractHandler.doStart(AbstractHandler.java:113)
at org.eclipse.jetty.util.component.AbstractLifeCycle.start(AbstractLifeCycle.java:68)
at org.eclipse.jetty.util.component.ContainerLifeCycle.start(ContainerLifeCycle.java:131)
at org.eclipse.jetty.server.Server.start(Server.java:452)
at org.eclipse.jetty.util.component.ContainerLifeCycle.doStart(ContainerLifeCycle.java:105)
at org.eclipse.jetty.server.handler.AbstractHandler.doStart(AbstractHandler.java:113)
at org.eclipse.jetty.server.Server.doStart(Server.java:419)
at org.eclipse.jetty.util.component.AbstractLifeCycle.start(AbstractLifeCycle.java:68)
at com.google.gwt.dev.shell.jetty.JettyLauncher.start(JettyLauncher.java:759)
at com.google.gwt.dev.DevMode.doStartUpServer(DevMode.java:634)
at com.google.gwt.dev.DevModeBase.startUp(DevModeBase.java:923)
at com.google.gwt.dev.DevModeBase.run(DevModeBase.java:706)
at com.google.gwt.dev.DevMode.main(DevMode.java:430)

Why my application fails to start?
Here is my pom and dependency tree . Thank you for your help

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 http://maven.apache.org/maven-v4_0_0.xsd">
 <!-- POM file generated with GWT webAppCreator -->
 <modelVersion>4.0.0</modelVersion>
 <groupId>com.mycompany.fonems.webapp</groupId>
 <artifactId>Fonemswebapp</artifactId>
 <packaging>war</packaging>
 <version>1.0-SNAPSHOT</version>
 <name>com.mycompany.fonems.webapp.Fonemswebapp</name>
  <parent> <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-parent</artifactId>
        <version>1.5.2.RELEASE</version>
  </parent>
 <properties>
   <!-- Setting maven.compiler.source to something different to 1.8
       needs that you configure the sourceLevel in gwt-maven-plugin since
       GWT compiler 2.8 requires 1.8 (see gwt-maven-plugin block below) -->
   <maven.compiler.source>1.8</maven.compiler.source>
   <maven.compiler.target>1.8</maven.compiler.target>
   <!-- Don't let your Mac use a crazy non-standard encoding -->
   <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
   <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
    <smartgwt.version>3.1</smartgwt.version>
 </properties>
 <dependencyManagement>
   <dependencies>
    <!-- ensure all GWT deps use the same version (unless overridden) -->
    <dependency>
      <groupId>com.google.gwt</groupId>
      <artifactId>gwt</artifactId>
      <version>2.8.0</version>
      <type>pom</type>
      <scope>import</scope>
    </dependency>
   </dependencies>
 </dependencyManagement>
 <dependencies>
    <dependency>
        <groupId>com.mycompany.fonems</groupId>
        <artifactId>fonems-fwk-server-common</artifactId>
        <version>0.0.104-SNAPSHOT</version>
        <exclusions>
            <exclusion>
                <artifactId>xercesImpl</artifactId>
                <groupId>xerces</groupId>
            </exclusion>
        </exclusions>
    </dependency>
    <dependency>
        <groupId>com.mycompany.fonems</groupId>
        <artifactId>fonems-refonte-dao</artifactId>
        <version>0.0.104-SNAPSHOT</version>
        <exclusions>
            <exclusion>
                <artifactId>javax.el-api</artifactId>
                <groupId>javax.el</groupId>
            </exclusion>
            <exclusion>
                <artifactId>xercesImpl</artifactId>
                <groupId>xerces</groupId>
            </exclusion>
        </exclusions>
    </dependency>
   <dependency>
    <groupId>com.google.gwt</groupId>
    <artifactId>gwt-servlet</artifactId>
    <scope>runtime</scope>
   </dependency>
   <dependency>
    <groupId>com.google.gwt</groupId>
    <artifactId>gwt-user</artifactId>
    <scope>provided</scope>
   </dependency>
   <dependency>
    <groupId>com.google.gwt</groupId>
    <artifactId>gwt-dev</artifactId>
    <scope>provided</scope>
    <exclusions>
        <exclusion>
            <artifactId>xercesImpl</artifactId>
            <groupId>xerces</groupId>
        </exclusion>
    </exclusions>
   </dependency>
    <dependency>
        <groupId>com.smartgwt</groupId>
        <artifactId>smartgwt</artifactId>
        <version>${smartgwt.version}</version>
    </dependency>
        <dependency>
            <groupId>com.smartgwt</groupId>
            <artifactId>smartgwt-skins</artifactId>
            <version>${smartgwt.version}</version>
            <optional>true</optional>
        </dependency>
        <dependency>
            <groupId>mycompany.drh</groupId>
            <artifactId>newncauth</artifactId>
            <version>${mycompany.drh.version}</version>
        </dependency>
        <dependency>
            <groupId>mycompany.drh</groupId>
            <artifactId>mycompany.droits-habilitations.rmi</artifactId>
            <version>${mycompany.drh.rmi.version}</version>
        </dependency>
   <dependency>
    <groupId>junit</groupId>
    <artifactId>junit</artifactId>
    <scope>test</scope>
   </dependency>
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <scope>compile</scope>
        </dependency>
 </dependencies>
 <build>
   <!-- Output classes directly into the webapp, so that IDEs and "mvn process-classes" update them in DevMode -->
   <outputDirectory>${project.build.directory}/${project.build.finalName}/WEB-INF/classes</outputDirectory>
   <plugins>
    <!-- GWT Maven Plugin-->
    <plugin>
      <groupId>net.ltgt.gwt.maven</groupId>
      <artifactId>gwt-maven-plugin</artifactId>
      <version>1.0-rc-6</version>
      <executions>
        <execution>
         <goals>
           <goal>import-sources</goal>
           <goal>compile</goal>
           <goal>import-test-sources</goal>
           <goal>test</goal>
         </goals>
        </execution>
      </executions>
      <configuration>
        <moduleName>com.mycompany.fonems.webapp.Fonemswebapp</moduleName>
        <moduleShortName>Fonemswebapp</moduleShortName>
        <failOnError>true</failOnError>
        <!-- GWT compiler 2.8 requires 1.8, hence define sourceLevel here if you use
            a different source language for java compilation -->
        <sourceLevel>1.8</sourceLevel>
        <!-- Compiler configuration -->
        <compilerArgs>
         <!-- Ask GWT to create the Story of Your Compile (SOYC) (gwt:compile) -->
         <arg>-compileReport</arg>
         <arg>-XcompilerMetrics</arg>
        </compilerArgs>
        <!-- DevMode configuration -->
        <warDir>${project.build.directory}/${project.build.finalName}</warDir>
        <classpathScope>compile+runtime</classpathScope>
        <!-- URL(s) that should be opened by DevMode (gwt:devmode). -->
        <startupUrls>
         <startupUrl>Fonemswebapp.html</startupUrl>
        </startupUrls>

<!--          <webappDirectory>${outputFolder}</webappDirectory> -->
      </configuration>

    </plugin>

    <!-- Skip normal test execution, we use gwt:test instead -->
    <plugin>
      <artifactId>maven-surefire-plugin</artifactId>
      <version>2.17</version>
      <configuration>
        <skip>true</skip>
      </configuration>
    </plugin>
   </plugins>
 </build>
</project>

dependency tree:

------------------------------------------------------------------------
Building com.mycompany.fonems.webapp.Fonemswebapp 1.0-SNAPSHOT
------------------------------------------------------------------------

--- maven-dependency-plugin:2.10:tree (default-cli) @ Fonemswebapp ---
com.mycompany.fonems.webapp:Fonemswebapp:war:1.0-SNAPSHOT
+- com.mycompany.fonems:fonems-fwk-server-common:jar:0.0.104-SNAPSHOT:compile
|  +- commons-configuration:commons-configuration:jar:1.9:compile
|  |  \- commons-logging:commons-logging:jar:1.1.1:compile
|  +- commons-beanutils:commons-beanutils:jar:1.9.3:compile
|  +- org.codehaus.jackson:jackson-mapper-asl:jar:1.9.13:compile
|  |  \- org.codehaus.jackson:jackson-core-asl:jar:1.9.13:compile
|  +- joda-time:joda-time:jar:2.9.7:compile
|  +- org.apache.commons:commons-lang3:jar:3.1:compile
|  +- commons-io:commons-io:jar:2.4:compile
|  +- commons-lang:commons-lang:jar:2.6:compile
|  +- commons-collections:commons-collections:jar:3.2.2:compile
|  +- org.springframework:spring-tx:jar:4.3.7.RELEASE:compile
|  +- org.springframework:spring-context:jar:4.3.7.RELEASE:compile
|  |  +- org.springframework:spring-aop:jar:4.3.7.RELEASE:compile
|  |  \- org.springframework:spring-expression:jar:4.3.7.RELEASE:compile
|  +- javax.xml.bind:jaxb-api:jar:2.2.12:compile
|  +- javax.validation:validation-api:jar:1.1.0.Final:compile
|  +- com.google.guava:guava:jar:18.0:compile
|  +- commons-betwixt:commons-betwixt:jar:0.8:compile
|  |  +- commons-beanutils:commons-beanutils-core:jar:1.7.0:compile
|  |  \- commons-digester:commons-digester:jar:2.1:compile
|  +- net.sf.dozer:dozer:jar:5.4.0:compile
|  +- org.slf4j:jcl-over-slf4j:jar:1.7.24:compile
|  +- uk.org.lidalia:sysout-over-slf4j:jar:1.0.2:compile
|  +- org.slf4j:slf4j-api:jar:1.7.24:compile
|  \- ch.qos.logback:logback-classic:jar:1.1.11:compile
|    \- ch.qos.logback:logback-core:jar:1.1.11:compile
+- com.mycompany.fonems:fonems-refonte-dao:jar:0.0.104-SNAPSHOT:compile
|  +- com.zaxxer:HikariCP:jar:2.5.1:compile
|  +- org.lazyluke:log4jdbc-remix:jar:0.2.7:compile
|  +- com.mycompany.fonems:fonems-config:jar:0.0.104-SNAPSHOT:compile
|  +- com.mycompany.fonems:fonems-refonte-model:jar:0.0.104-SNAPSHOT:compile
|  |  +- org.jvnet.jaxb2_commons:jaxb2-basics-runtime:jar:0.6.4:compile
|  |  +- openaccess:comFidessaInf:jar:3.0.1:compile
|  |  +- org.springframework.boot:spring-boot-starter-validation:jar:1.5.2.RELEASE:compile
|  |  |  +- org.springframework.boot:spring-boot-starter:jar:1.5.2.RELEASE:compile
|  |  |  |  +- org.springframework.boot:spring-boot:jar:1.5.2.RELEASE:compile
|  |  |  |  +- org.springframework.boot:spring-boot-autoconfigure:jar:1.5.2.RELEASE:compile
|  |  |  |  +- org.springframework.boot:spring-boot-starter-logging:jar:1.5.2.RELEASE:compile
|  |  |  |  |  +- org.slf4j:jul-to-slf4j:jar:1.7.24:compile
|  |  |  |  |  \- org.slf4j:log4j-over-slf4j:jar:1.7.24:compile
|  |  |  |  \- org.yaml:snakeyaml:jar:1.17:runtime
|  |  |  +- org.apache.tomcat.embed:tomcat-embed-el:jar:8.5.11:compile
|  |  |  \- org.hibernate:hibernate-validator:jar:5.3.4.Final:compile
|  |  |    \- com.fasterxml:classmate:jar:1.3.3:compile
|  |  \- org.springframework.boot:spring-boot-starter-data-jpa:jar:1.5.2.RELEASE:compile
|  |    +- org.springframework.boot:spring-boot-starter-aop:jar:1.5.2.RELEASE:compile
|  |    |  \- org.aspectj:aspectjweaver:jar:1.8.9:compile
|  |    +- org.springframework.boot:spring-boot-starter-jdbc:jar:1.5.2.RELEASE:compile
|  |    +- org.hibernate:hibernate-core:jar:5.0.12.Final:compile
|  |    |  +- antlr:antlr:jar:2.7.7:compile
|  |    |  \- org.jboss:jandex:jar:2.0.0.Final:compile
|  |    +- org.springframework.data:spring-data-jpa:jar:1.11.1.RELEASE:compile
|  |    |  +- org.springframework.data:spring-data-commons:jar:1.13.1.RELEASE:compile
|  |    |  \- org.springframework:spring-orm:jar:4.3.7.RELEASE:compile
|  |    \- org.springframework:spring-aspects:jar:4.3.7.RELEASE:compile
|  +- org.springframework:spring-core:jar:4.3.7.RELEASE:compile
|  +- org.springframework:spring-test:jar:4.3.7.RELEASE:compile
|  +- org.springframework:spring-jdbc:jar:4.3.7.RELEASE:compile
|  +- org.springframework:spring-beans:jar:4.3.7.RELEASE:compile
|  +- org.hsqldb:hsqldb:jar:2.3.3:compile
|  +- commons-dbcp:commons-dbcp:jar:1.4:compile
|  |  \- commons-pool:commons-pool:jar:1.6:compile
|  +- com.oracle:ojdbc7:jar:12.1.0.2:compile
|  \- de.jpdigital:hibernate5-ddl-maven-plugin:jar:1.0.0:compile
|    +- org.apache.maven:maven-artifact:jar:3.3.9:compile
|    +- org.apache.maven:maven-core:jar:3.3.9:compile
|    |  +- org.apache.maven:maven-model:jar:3.3.9:compile
|    |  +- org.apache.maven:maven-settings:jar:3.3.9:compile
|    |  +- org.apache.maven:maven-settings-builder:jar:3.3.9:compile
|    |  |  \- org.apache.maven:maven-builder-support:jar:3.3.9:compile
|    |  +- org.apache.maven:maven-repository-metadata:jar:3.3.9:compile
|    |  +- org.apache.maven:maven-model-builder:jar:3.3.9:compile
|    |  +- org.apache.maven:maven-aether-provider:jar:3.3.9:compile
|    |  |  \- org.eclipse.aether:aether-spi:jar:1.0.2.v20150114:compile
|    |  +- org.eclipse.aether:aether-impl:jar:1.0.2.v20150114:compile
|    |  +- org.eclipse.aether:aether-api:jar:1.0.2.v20150114:compile
|    |  +- org.eclipse.aether:aether-util:jar:1.0.2.v20150114:compile
|    |  +- org.eclipse.sisu:org.eclipse.sisu.plexus:jar:0.3.2:compile
|    |  |  +- javax.enterprise:cdi-api:jar:1.0:compile
|    |  |  |  \- javax.annotation:jsr250-api:jar:1.0:compile
|    |  |  \- org.eclipse.sisu:org.eclipse.sisu.inject:jar:0.3.2:compile
|    |  +- com.google.inject:guice:jar:no_aop:4.0:compile
|    |  |  +- javax.inject:javax.inject:jar:1:compile
|    |  |  \- aopalliance:aopalliance:jar:1.0:compile
|    |  +- org.codehaus.plexus:plexus-interpolation:jar:1.21:compile
|    |  +- org.codehaus.plexus:plexus-classworlds:jar:2.5.2:compile
|    |  +- org.codehaus.plexus:plexus-component-annotations:jar:1.6:compile
|    |  \- org.sonatype.plexus:plexus-sec-dispatcher:jar:1.3:compile
|    |    \- org.sonatype.plexus:plexus-cipher:jar:1.4:compile
|    +- org.apache.maven:maven-plugin-api:jar:3.3.9:compile
|    +- org.apache.maven:maven-project:jar:3.0-alpha-2:compile
|    |  +- org.apache.maven:maven-compat:jar:3.0-alpha-2:compile
|    |  |  \- org.apache.maven.wagon:wagon-provider-api:jar:1.0-beta-4:compile
|    |  +- org.codehaus.plexus:plexus-container-default:jar:1.0-beta-3.0.5:compile
|    |  |  +- org.apache.xbean:xbean-reflect:jar:3.4:compile
|    |  |  |  +- log4j:log4j:jar:1.2.12:compile
|    |  |  |  \- commons-logging:commons-logging-api:jar:1.1:compile
|    |  |  \- com.google.code.google-collections:google-collect:jar:snapshot-20080530:compile
|    |  +- org.codehaus.woodstox:wstx-asl:jar:3.2.6:compile
|    |  |  \- stax:stax-api:jar:1.0.1:compile
|    |  +- org.sonatype.spice:model-builder:jar:1.3:compile
|    |  \- org.apache.maven:maven-project-builder:jar:3.0-alpha-2:compile
|    +- org.codehaus.plexus:plexus-utils:jar:3.0.24:compile
|    +- org.hibernate:hibernate-entitymanager:jar:5.0.12.Final:compile
|    |  +- org.jboss.logging:jboss-logging:jar:3.3.0.Final:compile
|    |  +- dom4j:dom4j:jar:1.6.1:compile
|    |  +- org.hibernate.common:hibernate-commons-annotations:jar:5.0.1.Final:compile
|    |  +- org.hibernate.javax.persistence:hibernate-jpa-2.1-api:jar:1.0.0.Final:compile
|    |  +- org.javassist:javassist:jar:3.21.0-GA:compile
|    |  \- org.apache.geronimo.specs:geronimo-jta_1.1_spec:jar:1.1.1:compile
|    +- org.hibernate:hibernate-envers:jar:5.0.12.Final:compile
|    +- org.reflections:reflections:jar:0.9.10:compile
|    |  \- com.google.code.findbugs:annotations:jar:2.0.1:compile
|    \- javax.transaction:javax.transaction-api:jar:1.2:compile
+- com.google.gwt:gwt-servlet:jar:2.8.0:runtime
+- com.google.gwt:gwt-user:jar:2.8.0:provided
|  +- com.google.jsinterop:jsinterop-annotations:jar:1.0.1:provided
|  +- com.google.jsinterop:jsinterop-annotations:jar:sources:1.0.1:provided
|  +- javax.validation:validation-api:jar:sources:1.0.0.GA:provided
|  +- javax.servlet:javax.servlet-api:jar:3.1.0:provided
|  \- org.w3c.css:sac:jar:1.3:provided
+- com.google.gwt:gwt-dev:jar:2.8.0:provided
|  +- com.google.code.gson:gson:jar:2.8.0:provided
|  +- org.ow2.asm:asm:jar:5.0.3:provided
|  +- org.ow2.asm:asm-util:jar:5.0.3:provided
|  |  \- org.ow2.asm:asm-tree:jar:5.0.3:provided
|  +- org.ow2.asm:asm-commons:jar:5.0.3:provided
|  +- colt:colt:jar:1.2.0:provided
|  +- ant:ant:jar:1.6.5:provided
|  +- com.ibm.icu:icu4j:jar:50.1.1:provided
|  +- tapestry:tapestry:jar:4.0.2:provided
|  +- net.sourceforge.htmlunit:htmlunit:jar:2.21:provided
|  |  +- xalan:xalan:jar:2.7.2:provided
|  |  |  \- xalan:serializer:jar:2.7.2:provided
|  |  +- org.apache.httpcomponents:httpclient:jar:4.5.3:provided
|  |  |  \- org.apache.httpcomponents:httpcore:jar:4.4.6:provided
|  |  +- org.apache.httpcomponents:httpmime:jar:4.5.3:provided
|  |  +- commons-codec:commons-codec:jar:1.10:provided
|  |  +- net.sourceforge.htmlunit:htmlunit-core-js:jar:2.17:provided
|  |  +- net.sourceforge.htmlunit:neko-htmlunit:jar:2.21:provided
|  |  +- net.sourceforge.cssparser:cssparser:jar:0.9.18:provided
|  |  \- org.eclipse.jetty.websocket:websocket-client:jar:9.4.2.v20170220:provided
|  |    +- org.eclipse.jetty:jetty-client:jar:9.4.2.v20170220:provided
|  |    \- org.eclipse.jetty.websocket:websocket-common:jar:9.2.14.v20151106:provided
|  |       \- org.eclipse.jetty.websocket:websocket-api:jar:9.2.14.v20151106:provided
|  +- org.eclipse.jetty:jetty-webapp:jar:9.4.2.v20170220:provided
|  |  +- org.eclipse.jetty:jetty-xml:jar:9.4.2.v20170220:provided
|  |  \- org.eclipse.jetty:jetty-servlet:jar:9.4.2.v20170220:provided
|  |    \- org.eclipse.jetty:jetty-security:jar:9.4.2.v20170220:provided
|  |       \- org.eclipse.jetty:jetty-server:jar:9.4.2.v20170220:provided
|  +- org.eclipse.jetty:jetty-servlets:jar:9.4.2.v20170220:provided
|  |  +- org.eclipse.jetty:jetty-continuation:jar:9.4.2.v20170220:provided
|  |  +- org.eclipse.jetty:jetty-http:jar:9.4.2.v20170220:provided
|  |  +- org.eclipse.jetty:jetty-util:jar:9.4.2.v20170220:provided
|  |  \- org.eclipse.jetty:jetty-io:jar:9.4.2.v20170220:provided
|  +- org.eclipse.jetty:jetty-annotations:jar:9.4.2.v20170220:provided
|  |  +- org.eclipse.jetty:jetty-plus:jar:9.4.2.v20170220:provided
|  |  |  \- org.eclipse.jetty:jetty-jndi:jar:9.2.14.v20151106:provided
|  |  \- javax.annotation:javax.annotation-api:jar:1.2:provided
|  \- org.eclipse.jetty:apache-jsp:jar:9.4.2.v20170220:provided
|    +- org.eclipse.jetty.toolchain:jetty-schemas:jar:3.1:provided
|    +- org.mortbay.jasper:apache-jsp:jar:8.5.9.1:provided
|    |  \- org.mortbay.jasper:apache-el:jar:8.0.33:provided
|    \- org.eclipse.jdt.core.compiler:ecj:jar:4.4.2:provided
+- com.smartgwt:smartgwt:jar:3.1:compile
+- com.smartgwt:smartgwt-skins:jar:3.1:compile
+- mycompany.drh:newncauth:jar:2.0.0:compile
+- mycompany.drh:mycompany.droits-habilitations.rmi:jar:02.10.01:compile
+- junit:junit:jar:4.12:test
|  \- org.hamcrest:hamcrest-core:jar:1.3:test
\- org.projectlombok:lombok:jar:1.16.14:compile
------------------------------------------------------------------------
BUILD SUCCESS

------------------------------------------------------------------------

I tested the solutions proposed by Andy, but not successful, always the same exception
test 1 proposed by Andy (add property jetty.version 9.2.14.v20151106)

pom modification:
+1 line

<properties>
  <jetty.version>9.2.14.v20151106</jetty.version> 
</properties>

dependency tree modifications (other lines are unchanged compared to the first tree dependency):

+- com.google.gwt:gwt-dev:jar:2.8.0:provided
|  +- com.google.code.gson:gson:jar:2.8.0:provided
|  +- org.ow2.asm:asm:jar:5.0.3:provided
|  +- org.ow2.asm:asm-util:jar:5.0.3:provided
|  |  \- org.ow2.asm:asm-tree:jar:5.0.3:provided
|  +- org.ow2.asm:asm-commons:jar:5.0.3:provided
|  +- colt:colt:jar:1.2.0:provided
|  +- ant:ant:jar:1.6.5:provided
|  +- com.ibm.icu:icu4j:jar:50.1.1:provided
|  +- tapestry:tapestry:jar:4.0.2:provided
|  +- net.sourceforge.htmlunit:htmlunit:jar:2.21:provided
|  |  +- xalan:xalan:jar:2.7.2:provided
|  |  |  \- xalan:serializer:jar:2.7.2:provided
|  |  +- org.apache.httpcomponents:httpclient:jar:4.5.3:provided
|  |  |  \- org.apache.httpcomponents:httpcore:jar:4.4.6:provided
|  |  +- org.apache.httpcomponents:httpmime:jar:4.5.3:provided
|  |  +- commons-codec:commons-codec:jar:1.10:provided
|  |  +- net.sourceforge.htmlunit:htmlunit-core-js:jar:2.17:provided
|  |  +- net.sourceforge.htmlunit:neko-htmlunit:jar:2.21:provided
|  |  +- net.sourceforge.cssparser:cssparser:jar:0.9.18:provided
|  |  \- org.eclipse.jetty.websocket:websocket-client:jar:9.2.14.v20151106:provided
|  |    \- org.eclipse.jetty.websocket:websocket-common:jar:9.2.14.v20151106:provided
|  |       \- org.eclipse.jetty.websocket:websocket-api:jar:9.2.14.v20151106:provided
|  +- org.eclipse.jetty:jetty-webapp:jar:9.2.14.v20151106:provided
|  |  +- org.eclipse.jetty:jetty-xml:jar:9.2.14.v20151106:provided
|  |  \- org.eclipse.jetty:jetty-servlet:jar:9.2.14.v20151106:provided
|  |    \- org.eclipse.jetty:jetty-security:jar:9.2.14.v20151106:provided
|  +- org.eclipse.jetty:jetty-servlets:jar:9.2.14.v20151106:provided
|  |  +- org.eclipse.jetty:jetty-continuation:jar:9.2.14.v20151106:provided
|  |  +- org.eclipse.jetty:jetty-http:jar:9.2.14.v20151106:provided
|  |  +- org.eclipse.jetty:jetty-util:jar:9.2.14.v20151106:provided
|  |  \- org.eclipse.jetty:jetty-io:jar:9.2.14.v20151106:provided
|  +- org.eclipse.jetty:jetty-annotations:jar:9.2.14.v20151106:provided
|  |  +- org.eclipse.jetty:jetty-plus:jar:9.2.14.v20151106:provided
|  |  |  \- org.eclipse.jetty:jetty-jndi:jar:9.2.14.v20151106:provided
|  |  \- javax.annotation:javax.annotation-api:jar:1.2:provided
|  \- org.eclipse.jetty:apache-jsp:jar:9.2.14.v20151106:provided
|    +- org.eclipse.jetty:jetty-server:jar:9.2.14.v20151106:provided
|    +- org.eclipse.jetty.toolchain:jetty-schemas:jar:3.1.M0:provided
|    \- org.mortbay.jasper:apache-jsp:jar:8.0.9.M3:provided
|       \- org.mortbay.jasper:apache-el:jar:8.0.33:provided
+- com.smartgwt:smartgwt:jar:3.1:compile
+- com.smartgwt:smartgwt-skins:jar:3.1:compile

test 2 proposed by Andy (force dependencies in 9.2.14 to 9.4.2.v20170220)

pom modifications:

 <dependencyManagement>
  <dependency>
      <groupId>org.eclipse.jetty.websocket</groupId>
      <artifactId>websocket-common</artifactId>
      <version>9.4.2.v20170220</version>
      <scope>provided</scope>
    </dependency>
    <dependency>
      <groupId>org.eclipse.jetty.websocket</groupId>
      <artifactId>websocket-api</artifactId>
      <version>9.4.2.v20170220</version>
      <scope>provided</scope>
    </dependency>
    <dependency>
      <groupId>org.eclipse.jetty</groupId>
      <artifactId>jetty-jndi</artifactId>
      <version>9.4.2.v20170220</version>
      <scope>provided</scope>
    </dependency>
   </dependencies>
 </dependencyManagement>

dependency tree modifications (other lines are unchanged compared to the first tree dependency):

+- com.google.gwt:gwt-user:jar:2.8.0:provided
... 
|  |    \- org.eclipse.jetty.websocket:websocket-common:jar:9.4.2.v20170220:provided
|  |       \- org.eclipse.jetty.websocket:websocket-api:jar:9.4.2.v20170220:provided
...
|  |  |  \- org.eclipse.jetty:jetty-jndi:jar:9.4.2.v20170220:provided

last test logs:

11:17:35,004 |-INFO in ch.qos.logback.classic.joran.action.ConfigurationAction - debug attribute not set
11:17:35,020 |-INFO in ch.qos.logback.classic.joran.action.ConfigurationAction - Will scan for changes in [file:/C:/Dev/Appli/fonems-webapp/fonemswebapp/src/mai
n/webapp/WEB-INF/classes/logback.xml] 
11:17:35,020 |-INFO in ch.qos.logback.classic.joran.action.ConfigurationAction - Setting ReconfigureOnChangeTask scanning period to 1 minutes
11:17:35,020 |-ERROR in ch.qos.logback.core.joran.spi.Interpreter@2:52 - RuntimeException in Action for tag [configuration] java.lang.NullPointerException

at java.lang.NullPointerException
at java.lang.ClassLoader.resolveClass0(Native Method)
at java.lang.ClassLoader.resolveClass(ClassLoader.java:964)
at org.eclipse.jetty.webapp.WebAppClassLoader.loadClass(WebAppClassLoader.java:523)
at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
at ch.qos.logback.classic.util.EnvUtil.isGroovyAvailable(EnvUtil.java:36)
at ch.qos.logback.classic.joran.action.ConfigurationAction.begin(ConfigurationAction.java:68)
at ch.qos.logback.core.joran.spi.Interpreter.callBeginAction(Interpreter.java:269)
at ch.qos.logback.core.joran.spi.Interpreter.startElement(Interpreter.java:145)
at ch.qos.logback.core.joran.spi.Interpreter.startElement(Interpreter.java:128)
at ch.qos.logback.core.joran.spi.EventPlayer.play(EventPlayer.java:50)
at ch.qos.logback.core.joran.GenericConfigurator.doConfigure(GenericConfigurator.java:165)
at ch.qos.logback.core.joran.GenericConfigurator.doConfigure(GenericConfigurator.java:152)
at ch.qos.logback.core.joran.GenericConfigurator.doConfigure(GenericConfigurator.java:110)
...
at com.google.gwt.dev.DevMode.main(DevMode.java:430)
11:17:35,020 |-INFO in ch.qos.logback.classic.joran.JoranConfigurator@6af1c1b - Registering current configuration as safe fallback point

SLF4J: Actual binding is of type [ch.qos.logback.classic.util.ContextSelectorStaticBinder]
Exception in thread "main" java.lang.NoSuchMethodError: org.eclipse.jetty.websocket.server.WebSocketServerFactory.<init>(Ljavax/servlet/ServletContext;)V
at org.eclipse.jetty.websocket.server.NativeWebSocketConfiguration.<init>(NativeWebSocketConfiguration.java:53)

------------------------------------------------------------------------

I did an other test: I delete spring-boot dependency: result=same exception. Moreover, the dependency tree shows all jetty atrifacts in version 9.2.14.v20151106

Moreover, I try to search the class org.eclipse.jetty.websocket.server.WebSocketServerFactory in jars but not found. Where is it present? Why this class is mentionned in logs?
Thank you for your help

score 5 · Answer 1 · answered Apr 26 '17 at 19:11

5

You have a mixture of Jetty versions on the class path: 9.4.2.v20170220 and 9.2.14.v20151106. The former is what Spring Boot 1.5.2 uses by default. I would guess that latter is from the import of com.google.gwt:gwt.

You could override the jetty.version property that Spring Boot uses to set its value to 9.2.14.v20151106, thereby using 9.2.14 everywhere. Alternatively, you could declare your own dependency management for the modules that are currently using 9.2.14 to upgrade them to 9.4.2.

answered Apr 26 '17 at 19:11

Andy Wilkinson

108,729
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1

Ideally, you'd split client and server code into separate Maven modules so you don't have those conflicts. – Thomas Broyer Apr 26 '17 at 21:36
Andy, I test your 2 solutions: the both give me the same exception as the first one "NoSuchMethodError: org.eclipse.jetty.websocket.server.WebSocketServerFactory.(Ljavax/servlet/ServletContext;)V" – adnaneFonems Apr 27 '17 at 07:27
Please update your question with your new pom and dependency tree so that people can see what you tried. It's impossible to diagnose otherwise. – Andy Wilkinson Apr 27 '17 at 08:37
Andy I have updated my question with the two tests. Thank you for your help – adnaneFonems Apr 27 '17 at 12:56
as number of lines is limited in the answer, my pom and dependency tree are truncated – adnaneFonems Apr 27 '17 at 13:29

score 0 · Answer 2 · answered Apr 28 '17 at 10:02

If I upgrade spring-boot version to 1.5.3.RELEASE, it seems to be ok: no such exception appears.

<parent>
 <groupId>org.springframework.boot</groupId>
 <artifactId>spring-boot-starter-parent</artifactId>
 <version>1.5.3.RELEASE</version>
</parent>

Nevertheless, an another exception occured:

ServiceConfigurationError: org.apache.juli.logging.Log: Provider org.eclipse.jetty.apache.jsp.JuliLog not a subtype

To fix it, I have excluded jetty apache-jsp dependency from gwt-dev dependency

<dependency>
  <groupId>com.google.gwt</groupId>
  <artifactId>gwt-dev</artifactId>
  <scope>provided</scope>
  <exclusions>
    <exclusion>
        <artifactId>apache-jsp</artifactId>
        <groupId>org.eclipse.jetty</groupId>
    </exclusion>
  </exclusions>
</dependency>

NoSuchMethodError: org.eclipse.jetty.websocket.server.WebSocketServerFactory.(Ljavax/servlet/ServletContext;)V

------------------------------------------------------------------------

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