4.0.0 org.a2aproject.sdk a2a-java-sdk-parent 1.0.0.CR1 ../../pom.xml a2a-java-sdk-examples-parent pom Java SDK A2A Examples: Hello World Examples for the Java SDK for the Agent2Agent Protocol (A2A) io.quarkus quarkus-bom ${quarkus.platform.version} pom import org.a2aproject.sdk a2a-java-sdk-client client server