Tomcat configuration problem when using WebSockets

[sbuettner]

When launching a spring-boot based app (1.0.0.RC4) by running my main class using come sample code from the spring-boots-websocket-example, i am not able to establish a websocket connection because of the following exception:

java.lang.IllegalArgumentException:
No 'javax.websocket.server.ServerContainer' ServletContext attribute. 
Are you running in a Servlet container that supports JSR-356

This leads to a xhr-based fallback by the sockjs client.

The problem can be resolved using the provided solution in the issues comments:
https://jira.springsource.org/browse/SPR-10841?focusedCommentId=92892&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-92892

Any plans to enhance the embedded tomcat configuration?

[dsyer]

It works for me (the sample). The code from the JIRA link (or its equivalent) is included in the autoconfig setup for websockets. Where did you get the sample code (it changed recently so RC4 would only work with an older version of the sample probably)? Try a snapshot and master: https://github.com/spring-projects/spring-boot/tree/master/spring-boot-samples/spring-boot-sample-websocket?

[sbuettner]

I tried it out yesterday with a simple application using the gradle plugin but i can try to reproduce and document it more clearly.

[dsyer]

Sure. If you can share the code we might be able to see what you did different. Does the sample work for you?

[sbuettner]

The sample works and i am currently finding out what the difference is.

[bjconlan]

I just got stung by this today too, I'm curious to find out what you discover, I gave it a quick once over comparing both the rc4 and build snapshots from my local box and it looks like the 'spring-boot-autoconfigure' dependency is the issue.

But it's fixed in the current spring boot code (as per checkout today the 17th of March) so I just ended up building and installing the 1.0.0.BUILD-SNAPSHOT versions into my local repo then explicitly override the deps via

<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-autoconfigure</artifactId>
    <version>1.0.0.BUILD-SNAPSHOT</version>
</dependency>

in my pom for the meantime

[dsyer]

I guess that means this is fixed.