playframework / playframework/play-samples
Unexpected exception for play-java-websocket example
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help wanted
type:defect
- Dominant language
- JavaScript
- Stars
- 554
- Forks
- 548
- Avg merge
- 1d 11h
- Merged PRs (30d)
- 57
Description
Hi,
I encountered this problem when trying to render localhost:9000

I'm using java version "12.0.1" and sbt 1.2.8
Thanks!
Contributor guide
First steps
- Read the whole issue, then the project's contributing guide.
- Comment on the issue to say you are picking it up — it saves two people doing the same work.
- Fork the repository and make your change on a branch.
- Open a pull request that references the issue number.
Research direction
Start by reproducing the failure when rendering localhost:9000 in the play-java-websocket example with Java 12.0.1 and sbt 1.2.8. Inspect the example and the linked screenshot to identify the exception; done means the page renders without the reported exception under the relevant supported versions.
Written by the indexing model from the issue text.
Assessment
- Tech stack
- java
- Domain
- backend
- Issue type
- Bug
- Difficulty
- 3/5
- Estimated time
- 1-2 days
- Activity status
- Stale
- Clarity
- Needs clarification
- Newbie friendliness
- 25/100