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{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"no default JsonSchemaValidatorSupplier or default McpJsonMapper in mcp-json project","articleBody":"As per bug #562 I'm also getting these exceptions when running the latest 0.14.0 in repo (not deployed yet).\n\njava.lang.IllegalStateException: No default JsonSchemaValidatorSupplier implementation found\n\tat io.modelcontextprotocol.json.schema.JsonSchemaInternal.lambda$createDefaultValidator$2(JsonSchemaInternal.java:66)\n\tat java.base/java.util.Optional.orElseThrow(Optional.java:403)\n\tat io.modelcontextprotocol.json.schema.JsonSchemaInternal.createDefaultValidator(JsonSchemaInternal.java:61)\n\tat io.modelcontextprotocol.json.schema.JsonSchemaInternal.getDefaultValidator(JsonSchemaInternal.java:30)\n\tat io.modelcontextprotocol.json.schema.JsonSchemaValidator.getDefault(JsonSchemaValidator.java:61)\n\tat io.modelcontextprotocol.server.McpServer$SingleSessionAsyncSpecification.build(McpServer.java:232)\n\tat ...\n\nand\n\njava.lang.IllegalStateException: No default McpJsonMapper implementation found\n\tat io.modelcontextprotocol.json.McpJsonInternal.lambda$createDefaultMapper$2(McpJsonInternal.java:67)\n\tat java.base/java.util.Optional.orElseThrow(Optional.java:403)\n\tat io.modelcontextprotocol.json.McpJsonInternal.createDefaultMapper(McpJsonInternal.java:62)\n\tat io.modelcontextprotocol.json.McpJsonInternal.getDefaultMapper(McpJsonInternal.java:30)\n\tat io.modelcontextprotocol.json.McpJsonMapper.getDefault(McpJsonMapper.java:97)\n\tat io.modelcontextprotocol.server.McpServer$SingleSessionSyncSpecification.build(McpServer.java:818)\n\tat ...\n\nThis problem does not appear to me to be an OSGi problem as when I look in the [mcp-json project](https://github.com/modelcontextprotocol/java-sdk/tree/main/mcp-json) there does not appear to be any META-INF/services/* files.   I can see that the ServiceLoader is used in io.modelcontextprotocol.json.schema.JsonSchemaInternal line 41, and in io.modelcontextprotocol.json.McpJsonInternal line 45, so I suspect that the META-INF/services/* files in mcp-json were accidently not checked in.\n","author":{"url":"https://github.com/scottslewis","@type":"Person","name":"scottslewis"},"datePublished":"2025-09-25T01:50:49.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":6},"url":"https://github.com/574/java-sdk/issues/574"}