mcp-java8-sdk

The MCP Java SDK for Java 8 provides a Java-based runtime for creating and running MCP servers with compatibility for Java 8 and Spring Boot 2.x or Solon 3.x. This SDK is aimed at enabling MCP tooling and server components in environments restricted to Java 8, while preserving modern MCP patterns. To get started, run the provided JAR using a Java 8 runtime and use the built-in tooling to register MCP endpoints, define command handlers, and serialize/deserialize MCP messages. The SDK exposes a set of APIs for defining MCP services, message adapters, and lifecycle hooks, making it feasible to build custom MCP integrations that work with older Java stacks. Typical usage involves starting the server, wiring in endpoint handlers, and then deploying alongside your existing MCP clients or services. You can customize behavior through environment variables and standard Java options to tune performance and logging.

Prerequisites:

• Java 8 JRE/JDK or higher compatible with Java 8 features
• Optional: Maven or Gradle if building from source
• Access to a Java-enabled environment (Linux, macOS, Windows)

Install from binary release (recommended):

1. Download the mcp-java8-sdk.jar binary release.
2. Ensure Java is available: java -version
3. Run the server: java -jar mcp-java8-sdk.jar

Build from source (if you prefer compiling from repo):

1. Prerequisites: JDK 8+, Maven or Gradle installed.
2. Clone the repository: git clone <repository-url> cd <repository-directory>
3. Build (example with Maven): mvn clean package
4. Run the built artifact (path depends on build): java -jar target/mcp-java8-sdk-<version>.jar

Configuration:

• You can pass JVM options via JAVA_OPTS (e.g., -Xms256m -Xmx1024m).
• Adjust MCP_LOG_LEVEL to control logging verbosity (INFO or DEBUG).

Note: This SDK downgrades certain dependencies to maintain compatibility with Java 8 and supports Spring Boot 2.x and Solon 3.x environments.

Tips and considerations:

• Ensure you are actually running on a Java 8 runtime to avoid compatibility issues.
• If you encounter classpath or dependency issues, verify that you are using the Java 8-appropriate build of the SDK and that Spring Boot 2.x / Solon 3.x dependencies align with the downgraded set.
• Use MCP_LOG_LEVEL=DEBUG during troubleshooting to get verbose output.
• If you plan to integrate with existing MCP clients, confirm that endpoint definitions and message formats match your MCP version expectations.
• When deploying in containerized environments, map appropriate JVM memory settings and ensure network access to any required MCP services.