add step to build jar before image

Author: aaronsteers

airbyte_cdk/utils/docker.py

@@ -63,9 +63,20 @@ def _build_image(
 
     Raises: ConnectorImageBuildError if the build fails.
     """
+    connector_name = metadata.data.dockerRepository.split("/")[-1]
     if metadata.data.language == ConnectorLanguage.JAVA:
         # For Java connectors, the context directory is the repo root.
         context_dir = context_dir.parent.parent.parent
+        # For Java connectors, we need to build the connector tar file first.
+        response: subprocess.CompletedProcess[str] = subprocess.run(
+            [
+                "./gradlew",
+                f":airbyte-integrations:connectors:{connector_name}:distTar",
+            ],
+            cwd=context_dir,
+            text=True,
+            check=True,
+        )
 
     docker_args: list[str] = [
         "docker",

airbyte_cdk/utils/docker_image_templates.py

@@ -149,11 +149,15 @@
     chown airbyte:airbyte /airbyte/base.sh /airbyte/javabase.sh /airbyte/dd-java-agent.jar
 
 # Set environment variables
+# These variables tell base.sh what to do:
 ENV AIRBYTE_SPEC_CMD="/airbyte/javabase.sh --spec"
 ENV AIRBYTE_CHECK_CMD="/airbyte/javabase.sh --check"
 ENV AIRBYTE_DISCOVER_CMD="/airbyte/javabase.sh --discover"
 ENV AIRBYTE_READ_CMD="/airbyte/javabase.sh --read"
 ENV AIRBYTE_WRITE_CMD="/airbyte/javabase.sh --write"
+
+# base.sh will set the classpath for the connector and invoke javabase.sh
+# using one of the above commands.
 ENV AIRBYTE_ENTRYPOINT="/airbyte/base.sh"
 ENV APPLICATION="${CONNECTOR_KEBAB_NAME}"