added automatic classpath loading and JAVA_CLASS envvar usage

Dockerfile

@@ -4,6 +4,7 @@ FROM ubuntu:${ubuntu.version}
 # Configure standard JAVA parameters
 ENV JAVA_MEMORY_INIT=128m
 ENV JAVA_MEMORY_MAX=512m
+ENV JAVA_HOME=/usr/local/lib/jvm/java-openjdk-dcevm
 ENV JAVA_OPTS=
 
 # Install curl
@@ -37,6 +38,3 @@ EXPOSE 8000
 
 # Execute the Docker container initialization script
 ENTRYPOINT [ "/usr/local/bin/docker-entrypoint.sh" ]
-
-# Do nothing meaningful; made to be overridden
-CMD [ "-version" ]