code: public CliCommandBuilder addJavaOption(final String jvmArg) {
          if (jvmArg != null && !jvmArg.trim().isEmpty()) {
              javaOpts.add(jvmArg);
          }
          return this;
      }
docs: Adds a JVM argument to the command ignoring {@code null} arguments.
  
  @param jvmArg the JVM argument to add
  
  @return the builder