Atmosphere causes java.lang.Linkage error if included in basic vert.x Maven project

[lonerzzz]

If the atmosphere vert.x plugin is listed as a dependency in a basic vert.x project created using the vertx archetype from eclipse, then the basic installed code gets a Linkage error when the unit tests are run:

java.lang.LinkageError: loader constraint violation: loader (instance of org/vertx/java/platform/impl/ModuleClassLoader) previously initiated loading for a different type with name "org/vertx/java/core/Vertx"
at java.lang.ClassLoader.defineClass1(Native Method)
at java.lang.ClassLoader.defineClass(ClassLoader.java:792)
at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142)
at java.net.URLClassLoader.defineClass(URLClassLoader.java:449)
at java.net.URLClassLoader.access$100(URLClassLoader.java:71)
at java.net.URLClassLoader$1.run(URLClassLoader.java:361)
at java.net.URLClassLoader$1.run(URLClassLoader.java:355)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:354)
at org.vertx.java.platform.impl.ModuleClassLoader.doLoadClass(ModuleClassLoader.java:77)
at org.vertx.java.platform.impl.ModuleClassLoader.loadClass(ModuleClassLoader.java:61)
at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
at com..PingVerticle.start(PingVerticle.java:32)
at org.vertx.java.platform.Verticle.start(Verticle.java:82)
at org.vertx.java.platform.impl.DefaultPlatformManager$18.run(DefaultPlatformManager.java:1278)
at org.vertx.java.core.impl.DefaultContext$3.run(DefaultContext.java:171)
at io.netty.util.concurrent.SingleThreadEventExecutor.runAllTasks(SingleThreadEventExecutor.java:353)
at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:366)
at io.netty.util.concurrent.SingleThreadEventExecutor$2.run(SingleThreadEventExecutor.java:101)
at java.lang.Thread.run(Thread.java:724)

Steps to reproduce:

1. Create vertx maven project using vertx archetype available in eclipse Juno
2. Edit pom file to add dependency for atmosphere in project
3. Run unit tests with 'maven install' command
4. Boom