Overview

This subdirectory contains all Vitess Java code.

It is split in the following subdirectories (Maven modules):

• client: Our Java client library.
  • See VTGateConn.java and VTGateBlockingConn.java for the API.
  • Note: The library is agnostic of the underlying RPC system and only defines an interface for that.
  • In open-source, the library must always be used together with the code in grpc-client.
• grpc-client: Implements the client's RPC interface for gRPC.
• jdbc: JDBC driver implementation for Vitess.
• example: Examples for using the client or the jdbc module.
• hadoop: Vitess support for Hadoop. See documentation for details.

Note: The artifactId for each module listed above has the prefix vitess- i.e. you will have to look for vitess-jdbc and not jdbc.

TODO(mberlin): Mention Maven Central once we started publishing artifacts there.

Adding new Dependencies

When submitting contributions which require new dependencies, please follow these guidelines:

• Put every directly used dependency into the module's dependencies section (e.g. in jdbc/pom.xml for changes to the JDBC code).
  • make java_test (which calls mvn verify in the /java directory) will run mvn dependency:analyze and fail if you got this wrong.
• Limit the scope of test dependencies to <scope>test</scope>.
• Do not include the version number in the module's pom.xml. Instead, add the dependency to the dependencyManagement section in /java/pom.xml and include the version number there.
• Sort dependencies in alphabetic order. Modules only: Put all dependencies with limited scope (e.g. test) in a separate block and sort it alphabetically as well (see /java/client/pom.xml for an example).
• Feel free to separate groups of dependencies by newlines (e.g. all io.vitess.* dependencies are a group).