4.0.0 io.github.a2asdk a2a-java-sdk-parent 0.2.5.Beta2 a2a-java-sdk-spec jar Java SDK A2A Spec Java SDK for the Agent2Agent Protocol (A2A) - Spec ${project.groupId} a2a-java-sdk-common ${project.version} com.fasterxml.jackson.core jackson-databind com.fasterxml.jackson.datatype jackson-datatype-jsr310 org.junit.jupiter junit-jupiter-api test