NoClassDefFoundError (HttpSessionIdListener) when launching SDM, after switching from gwt-2.8.0-beta1 to rc2

[Boris Brudnoy]

Hello all,

After switching GWT version from '2.8.0-beta1' to '2.8.0-rc2' in my Maven project's pom.xml, launching code server by running `gwt:codeserver` started to fail:

[ERROR] Failed to execute goal net.ltgt.gwt.maven:gwt-maven-plugin:1.0-rc-4:codeserver (default-cli)

With this stack trace preceding the error:

[INFO]    Module setup completed in 7362 ms

[WARNING] java.lang.NoClassDefFoundError: javax/servlet/http/HttpSessionIdListener

[WARNING] at org.eclipse.jetty.server.session.SessionHandler.<clinit>(SessionHandler.java:54)

[WARNING] at org.eclipse.jetty.servlet.ServletContextHandler.newSessionHandler(ServletContextHandler.java:241)

[WARNING] at org.eclipse.jetty.servlet.ServletContextHandler.getSessionHandler(ServletContextHandler.java:334)

[WARNING] at org.eclipse.jetty.servlet.ServletContextHandler.relinkHandlers(ServletContextHandler.java:180)

[WARNING] at org.eclipse.jetty.servlet.ServletContextHandler.<init>(ServletContextHandler.java:157)

[WARNING] at org.eclipse.jetty.servlet.ServletContextHandler.<init>(ServletContextHandler.java:117)

[WARNING] at org.eclipse.jetty.servlet.ServletContextHandler.<init>(ServletContextHandler.java:105)

[WARNING] at com.google.gwt.dev.codeserver.WebServer.start(WebServer.java:129)

[WARNING] at com.google.gwt.dev.codeserver.CodeServer.start(CodeServer.java:161)

[WARNING] at com.google.gwt.dev.codeserver.CodeServer.main(CodeServer.java:102)

[WARNING] at com.google.gwt.dev.codeserver.CodeServer.main(CodeServer.java:55)

[WARNING] Caused by: java.lang.ClassNotFoundException: javax.servlet.http.HttpSessionIdListener

[WARNING] at java.net.URLClassLoader.findClass(URLClassLoader.java:381)

[WARNING] at java.lang.ClassLoader.loadClass(ClassLoader.java:424)

[WARNING] at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:331)

[WARNING] at java.lang.ClassLoader.loadClass(ClassLoader.java:357)

[WARNING] ... 11 more

I'm guessing it's to do with the version of the Servlet API being depended on somewhere but so far my attempts to add/substitute/exclude dependencies led nowhere.

Thanks,

Boris

[Jens]

GWT uses Jetty 9 so it expects servlet-api 3.1. If your project depends on a different version you need to fix that, so look at your dependency tree to see where it comes from.

mvn dependency:tree -Dverbose -Dincludes=javax.servlet:servlet-api,javax.servlet:javax.servlet-api

I hope the include pattern is correct, otherwise just omit it.

-- J.

[Boris Brudnoy]

Grepcode is telling me that javax.servlet.http.HttpSessionIdListener exists only since javax.servlet-api 3.1, however the dependency:tree command suggests that GWT 2.8 RC2 uses 3.0.1 (I don't undertand the "version managed from 3.1.0" part, though): 

[INFO] +- com.google.gwt:gwt-user:jar:2.8.0-rc2:compile

[INFO] |  \- javax.servlet:javax.servlet-api:jar:3.0.1:provided (version managed from 3.1.0; scope managed from compile)

(I replaced the only reference to Servlets API 2.5 in my project, first with 3.0.1 and then with 3.1, but to no avail)

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BORIS BRUDNOY

Web Application Developer, Java/GWT Enthusiast (LinkedIn)

[Thomas Broyer]

"version managed from 3.1.0" means that gwt-user depends on 3.1.0 but your dependency tree somehow "manages" the version to be 3.0.1. This (I believe) means you have 3.0.1 somewhere in your dependencyManagement.

[Boris Brudnoy]

The addition of the morsel about "managed from 3.1.0" pivoted me into looking in the dependencyManagement section of the parent project, and there it was, the declaration I somehow glossed over:

      <dependency>

        <groupId>javax.servlet</groupId>

        <artifactId>javax.servlet-api</artifactId>

        <version>3.0.1</version>

        <scope>provided</scope>

      </dependency>

Removing it resolved the problem. Thanks Jens and Thomas!

On Tue, Aug 16, 2016 at 4:46 PM Thomas Broyer <t.br...@gmail.com> wrote:

"version managed from 3.1.0" means that gwt-user depends on 3.1.0 but your dependency tree somehow "manages" the version to be 3.0.1. This (I believe) means you have 3.0.1 somewhere in your dependencyManagement.

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[N Troncoso]

I'm having the same issue as Boris, except my dependency tree shows that I'm using 3.1:

[INFO] +- com.google.gwt:gwt-user:jar:2.8.0-rc2:compile

[INFO] |  \- javax.servlet:javax.servlet-api:jar:3.1.0:provided (scope managed from compile)

[INFO] \- com.google.gwt:gwt-dev:jar:2.8.0-rc2:compile

[INFO]    \- org.eclipse.jetty:apache-jsp:jar:9.2.14.v20151106:compile

[INFO]       +- org.eclipse.jetty:jetty-server:jar:9.2.14.v20151106:compile

[INFO]       |  \- (javax.servlet:javax.servlet-api:jar:3.1.0:provided - scope managed from compile; omitted for duplicate)

[INFO]       \- (javax.servlet:javax.servlet-api:jar:3.1.0:provided - scope managed from compile; omitted for duplicate)

The only place this is specified is in the parent pom:

    <dependencyManagement>

        <dependencies>

            <dependency>

                <groupId>com.google.gwt</groupId>

                <artifactId>gwt</artifactId>

                <version>2.8.0-rc2</version>

                <type>pom</type>

                <scope>import</scope>

            </dependency>

            <dependency>

                <groupId>javax.servlet</groupId>

                <artifactId>javax.servlet-api</artifactId>

                <version>3.1.0</version>

                <scope>provided</scope>

            </dependency>

        </dependencies>

    </dependencyManagement>

I get the exact same error that he posted when trying to run the codeserver. The only difference is that he's using gwt-maven-plugin:1.0-rc-4 and I'm using gwt-maven-plugin:1.0-rc-6

[N Troncoso]

For anyone with the same issue as me, I had to remove the <scope>provided</scope> in the dependency management for javax.servlet

[Thomas Broyer]

Or maybe adjust the classpathScope to include provided dependencies? http://tbroyer.github.io/gwt-maven-plugin/devmode-mojo.html#classpathScope / http://tbroyer.github.io/gwt-maven-plugin/codeserver-mojo.html#classpathScope

(see also the samples from the GWT SDK, or the POM generated by webAppCreator)