Hi I'm creating and testing websockets in my project and I have the following classpath: compile "io.undertow:undertow-servlet:$undertowVersion" compile "io.undertow:undertow-websockets-jsr:$undertowVersion" testCompile "org.glassfish.tyrus:tyrus-client:$tyrusVersion" testCompile "org.glassfish.tyrus:tyrus-container-grizzly-client:$tyrusVersion" This doesn't work: Caused by: java.lang.ClassCastException: org.glassfish.tyrus.client.ClientManager cannot be cast to io.undertow.websockets.jsr.ServerWebSocketContainer at io.undertow.websockets.jsr.Bootstrap.handleDeployment(Bootstrap.java:62) at io.undertow.servlet.core.DeploymentManagerImpl.handleExtensions(DeploymentManagerImpl.java:252) at io.undertow.servlet.core.DeploymentManagerImpl.deploy(DeploymentManagerImpl.java:152) The code in Bootstrap.java randomly picks an implementation through ServiceLoader and tries to cast it: https://github.com/undertow-io/undertow/blob/master/websockets-jsr/src/ma... Why not load the desired type directly? Should I be able to deploy several websocket implementations? If not, what's the best option for testing? Thanks, Christian _______________________________________________ undertow-dev mailing list undertow-dev(a)lists.jboss.org https://lists.jboss.org/mailman/listinfo/undertow-dev