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{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"Session not found handling","articleBody":"**Bug description**\nAfter a server restart, a client calling the message endpoint with its session id it obtained via the previous running server instance gets a HTTP/1.1 500 Internal Server Error\n\n\n**Environment**\njava-sdk: 0.8.1 via Spring AI\n\n**Steps to reproduce**\nCall server message endpoint after a server restart, using previous sessionId\n\n**Expected behavior**\nNot too sure but it seems that the client should not interpret that there was indeed an internal server error because of a restart. It could either get a message which leads to recreating a session or there should be some sessions persistence between restart. There is a TODO around the code which returns the 500: https://github.com/modelcontextprotocol/java-sdk/blob/main/mcp-spring/mcp-spring-webflux/src/main/java/io/modelcontextprotocol/server/transport/WebFluxSseServerTransportProvider.java#L288\n\n","author":{"url":"https://github.com/tikal","@type":"Person","name":"tikal"},"datePublished":"2025-04-04T11:15:18.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":2},"url":"https://github.com/107/java-sdk/issues/107"}