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Unable to Have a Combined Javalin/Selenium Project

See original GitHub issue

When trying to make a project with a combination of Javalin and Selenium server, I run into a weird error when attempting to start the Javalin server.

I’ve created a very simple project that should give a good example.

With this defined as your 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/xsd/maven-4.0.0.xsd">
   <modelVersion>4.0.0</modelVersion>

   <groupId>example</groupId>
   <artifactId>javalin-and-selenium</artifactId>
   <version>1.0.0-SNAPSHOT</version>

   <properties>
      <java.version>1.8</java.version>
      <maven.compiler.source>${java.version}</maven.compiler.source>
      <maven.compiler.target>${java.version}</maven.compiler.target>
      <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
      <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
   </properties>

   <dependencies>
      <dependency>
         <groupId>io.javalin</groupId>
         <artifactId>javalin</artifactId>
         <version>2.0.0.RC1</version>
      </dependency>
      <dependency>
         <groupId>org.seleniumhq.selenium</groupId>
         <artifactId>selenium-server</artifactId>
         <version>3.13.0</version>
         <exclusions>
            <exclusion>
               <groupId>log4j</groupId>
               <artifactId>log4j</artifactId>
            </exclusion>
         </exclusions>
      </dependency>
      <dependency>
         <groupId>ch.qos.logback</groupId>
         <artifactId>logback-classic</artifactId>
         <version>1.2.3</version>
      </dependency>
      <dependency>
         <groupId>org.slf4j</groupId>
         <artifactId>log4j-over-slf4j</artifactId>
         <version>1.7.25</version>
      </dependency>
   </dependencies>
</project>

And this defined as example.Main:

package example;

import io.javalin.Javalin;

public class Main {
  public static void main(String[] args) {
    Javalin.create().start();
  }
}

You should get an error similar to the below when running #main:

11:03:21.103 [main] DEBUG org.eclipse.jetty.util.log - Logging to Logger[org.eclipse.jetty.util.log] via org.eclipse.jetty.util.log.Slf4jLog
11:03:21.120 [main] INFO org.eclipse.jetty.util.log - Logging initialized @1230ms to org.eclipse.jetty.util.log.Slf4jLog
11:03:21.149 [main] DEBUG org.eclipse.jetty.util.component.ContainerLifeCycle - org.eclipse.jetty.server.Server@7382f612[9.4.8.v20171121] added {QueuedThreadPool@qtp385242642{STOPPED,8<=0<=250,i=0,q=0},AUTO}
11:03:21.157 [main] DEBUG org.eclipse.jetty.util.component.ContainerLifeCycle - org.eclipse.jetty.server.Server@7382f612[9.4.8.v20171121] added {org.eclipse.jetty.server.LowResourceMonitor@3d04a311,AUTO}
11:03:21.415 [main] INFO io.javalin.Javalin - 
 _________________________________________
|        _                  _ _           |
|       | | __ ___   ____ _| (_)_ __      |
|    _  | |/ _` \ \ / / _` | | | '_ \     |
|   | |_| | (_| |\ V / (_| | | | | | |    |
|    \___/ \__,_| \_/ \__,_|_|_|_| |_|    |
|_________________________________________|
|                                         |
|    https://javalin.io/documentation     |
|_________________________________________|
11:03:21.415 [main] INFO io.javalin.Javalin - Starting Javalin ...
11:03:21.468 [main] DEBUG org.eclipse.jetty.util.DecoratedObjectFactory - Adding Decorator: org.eclipse.jetty.util.DeprecationWarning@97e1986
11:03:21.497 [main] DEBUG org.eclipse.jetty.util.component.ContainerLifeCycle - i.j.c.u.initialize$httpHandler$1@23ceabc1{/,null,UNAVAILABLE} added {org.eclipse.jetty.server.session.SessionHandler1566502717==dftMaxIdleSec=-1,MANAGED}
11:03:21.513 [main] DEBUG org.eclipse.jetty.util.component.ContainerLifeCycle - org.eclipse.jetty.server.session.SessionHandler1566502717==dftMaxIdleSec=-1 added {org.eclipse.jetty.servlet.ServletHandler@5419f379,MANAGED}
11:03:21.514 [main] DEBUG org.eclipse.jetty.util.DecoratedObjectFactory - Adding Decorator: org.eclipse.jetty.util.DeprecationWarning@7dc7cbad
11:03:21.514 [main] DEBUG org.eclipse.jetty.util.component.ContainerLifeCycle - o.e.j.s.ServletContextHandler@d2cc05a{/,null,UNAVAILABLE} added {org.eclipse.jetty.servlet.ServletHandler@4f933fd1,MANAGED}
11:03:21.536 [main] DEBUG org.eclipse.jetty.util.component.ContainerLifeCycle - org.eclipse.jetty.servlet.ServletHandler@4f933fd1 added {io.javalin.core.util.JettyServerUtil$initialize$$inlined$apply$lambda$1-59fa1d9b@69a2b0b0==io.javalin.core.util.JettyServerUtil$initialize$$inlined$apply$lambda$1,jsp=null,order=-1,inst=true,AUTO}
11:03:21.537 [main] DEBUG org.eclipse.jetty.util.component.ContainerLifeCycle - org.eclipse.jetty.servlet.ServletHandler@4f933fd1 added {[/*]=>io.javalin.core.util.JettyServerUtil$initialize$$inlined$apply$lambda$1-59fa1d9b,POJO}
11:03:21.541 [main] DEBUG org.eclipse.jetty.util.component.ContainerLifeCycle - org.eclipse.jetty.server.handler.HandlerList@59f99ea[i.j.c.u.initialize$httpHandler$1@23ceabc1{/,null,UNAVAILABLE}, o.e.j.s.ServletContextHandler@d2cc05a{/,null,UNAVAILABLE}, io.javalin.core.util.JettyServerUtil$initialize$notFoundHandler$1670035812==dftMaxIdleSec=-1] added {i.j.c.u.initialize$httpHandler$1@23ceabc1{/,null,UNAVAILABLE},AUTO}
11:03:21.541 [main] DEBUG org.eclipse.jetty.util.component.ContainerLifeCycle - org.eclipse.jetty.server.handler.HandlerList@59f99ea[i.j.c.u.initialize$httpHandler$1@23ceabc1{/,null,UNAVAILABLE}, o.e.j.s.ServletContextHandler@d2cc05a{/,null,UNAVAILABLE}, io.javalin.core.util.JettyServerUtil$initialize$notFoundHandler$1670035812==dftMaxIdleSec=-1] added {o.e.j.s.ServletContextHandler@d2cc05a{/,null,UNAVAILABLE},AUTO}
11:03:21.542 [main] DEBUG org.eclipse.jetty.util.component.ContainerLifeCycle - org.eclipse.jetty.server.handler.HandlerList@59f99ea[i.j.c.u.initialize$httpHandler$1@23ceabc1{/,null,UNAVAILABLE}, o.e.j.s.ServletContextHandler@d2cc05a{/,null,UNAVAILABLE}, io.javalin.core.util.JettyServerUtil$initialize$notFoundHandler$1670035812==dftMaxIdleSec=-1] added {io.javalin.core.util.JettyServerUtil$initialize$notFoundHandler$1670035812==dftMaxIdleSec=-1,AUTO}
11:03:21.543 [main] DEBUG org.eclipse.jetty.util.component.ContainerLifeCycle - org.eclipse.jetty.server.handler.HandlerWrapper@6f7fd0e6 added {org.eclipse.jetty.server.handler.HandlerList@59f99ea[i.j.c.u.initialize$httpHandler$1@23ceabc1{/,null,UNAVAILABLE}, o.e.j.s.ServletContextHandler@d2cc05a{/,null,UNAVAILABLE}, io.javalin.core.util.JettyServerUtil$initialize$notFoundHandler$1670035812==dftMaxIdleSec=-1],MANAGED}
11:03:21.543 [main] DEBUG org.eclipse.jetty.util.component.ContainerLifeCycle - org.eclipse.jetty.server.handler.HandlerWrapper@6f7fd0e6 added {org.eclipse.jetty.server.handler.HandlerWrapper@47c62251,MANAGED}
11:03:21.544 [main] DEBUG org.eclipse.jetty.util.component.ContainerLifeCycle - org.eclipse.jetty.server.handler.HandlerWrapper@47c62251 added {org.eclipse.jetty.server.handler.HandlerList@59f99ea[i.j.c.u.initialize$httpHandler$1@23ceabc1{/,null,UNAVAILABLE}, o.e.j.s.ServletContextHandler@d2cc05a{/,null,UNAVAILABLE}, io.javalin.core.util.JettyServerUtil$initialize$notFoundHandler$1670035812==dftMaxIdleSec=-1],MANAGED}
11:03:21.544 [main] DEBUG org.eclipse.jetty.util.component.ContainerLifeCycle - org.eclipse.jetty.server.Server@7382f612[9.4.8.v20171121] added {org.eclipse.jetty.server.handler.HandlerWrapper@47c62251,MANAGED}
Exception in thread "main" java.lang.NoClassDefFoundError: org/eclipse/jetty/io/WriteFlusher$Listener
	at java.lang.ClassLoader.defineClass1(Native Method)
	at java.lang.ClassLoader.defineClass(ClassLoader.java:763)
	at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142)
	at java.net.URLClassLoader.defineClass(URLClassLoader.java:467)
	at java.net.URLClassLoader.access$100(URLClassLoader.java:73)
	at java.net.URLClassLoader$1.run(URLClassLoader.java:368)
	at java.net.URLClassLoader$1.run(URLClassLoader.java:362)
	at java.security.AccessController.doPrivileged(Native Method)
	at java.net.URLClassLoader.findClass(URLClassLoader.java:361)
	at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
	at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:335)
	at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
	at org.eclipse.jetty.server.ServerConnector.<init>(ServerConnector.java:96)
	at io.javalin.core.util.JettyServerUtil.initialize(JettyServerUtil.kt:87)
	at io.javalin.Javalin.start(Javalin.java:125)
	at ca.grrbrr.example.Main.main(Main.java:7)
Caused by: java.lang.ClassNotFoundException: org.eclipse.jetty.io.WriteFlusher$Listener
	at java.net.URLClassLoader.findClass(URLClassLoader.java:381)
	at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
	at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:335)
	at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
	... 16 more

I’m sure this issue is related to Selenium and Javalin both utilizing jetty, but I’m having a hard time figuring out how, why and what I could do to get around this issue.

Issue Analytics

  • State:closed
  • Created 5 years ago
  • Comments:7 (7 by maintainers)

github_iconTop GitHub Comments

1reaction
Jitsusamacommented, Jul 6, 2018

FYI; that looks like it has fixed everything. I’m wondering if Selenium uses it’s jetty stuff for some weird corner features that I don’t even utilize. Thanks for taking the time to respond to this issue @tipsy!

0reactions
tipsycommented, Jul 5, 2018

Seems like you’ve got this one under control, have fun!

Read more comments on GitHub >

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