Claus Ibsen created CAMEL-26469:
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Summary: camel-mcp-server, camel-openai - Use the Jackson 3 JSON
module of the MCP Java SDK (mcp-json-jackson3)
Key: CAMEL-26469
URL: https://issues.apache.org/jira/browse/CAMEL-26469
Project: Camel
Issue Type: Improvement
Components: camel-mcp-server, camel-openai
Reporter: Claus Ibsen
Fix For: 4.24.0
The MCP Java SDK (2.1.0) ships its JSON support in two modules:
{{mcp-json-jackson2}} and {{mcp-json-jackson3}}. Camel uses the Jackson 2 one.
As Camel moves to Jackson 3 (CAMEL-22857), the MCP modules can switch to
{{mcp-json-jackson3}}.
*Modules that use mcp-json-jackson2 today*
* {{camel-mcp-server}}: compile dependency. Also uses Jackson 2 directly in
{{McpServerIconsParser}} ({{com.fasterxml.jackson.databind.ObjectMapper}}).
* {{camel-openai}}: compile dependency (the MCP client of the tool calls).
{{McpToolCallExecutor}} and other classes import Jackson 2 directly (14 imports
in src/main).
* {{camel-mcp-server-api}}: test scope.
* {{camel-jbang-core}}: test scope.
*Things to look at*
* {{mcp-json-jackson3}} 2.1.0 provides both services the SDK looks up
({{McpJsonMapperSupplier}} and {{JsonSchemaValidatorSupplier}}). It depends on
{{tools.jackson.core:jackson-databind}} 3.1.4 (Camel manages 3.2.4) and on
{{com.networknt:json-schema-validator}} *3.0.6*. Camel uses networknt *2.0.1*
({{networknt-json-schema-validator-version}}, set explicitly in
camel-json-validator, camel-yaml-dsl, camel-yaml-dsl-validator and
camel-jbang-core). {{mcp-json-jackson2}} uses networknt 2.0.4. A classpath with
both, such as {{camel run}} with the YAML DSL and camel-mcp-server, gets one
networknt version for both users, and 2.x and 3.x are different major versions.
* Keep only one of the two SDK JSON modules on a classpath. The SDK takes the
first {{McpJsonMapperSupplier}} its service loader finds, so with both present
the Jackson version in use depends on the classpath order.
* Vert.x 5 ({{camel-platform-http-vertx}}) still brings Jackson 2, so Jackson 2
stays on the classpath of camel-mcp-server.
* The pom comment in camel-mcp-server about {{jackson-annotations}} (mcp-core
declares an older one) applies to Jackson 3 as well: Jackson 3 uses the Jackson
2 {{jackson-annotations}} artifact and needs 2.21 or later.
*Not a fix for CAMEL-26298*: that startup failure of {{camel run --mcp-stdio}}
was a class loader problem (the service loader of the thread context class
loader); {{mcp-json-jackson3}} is found the same way.
_Claude Code on behalf of davsclaus (Claus Ibsen)_
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