private static String buildClasspath(final String additionalClasspath) {
    final StringBuilder classpath = new StringBuilder(System.getProperty("java.class.path"));

    if (additionalClasspath != null) {
      classpath.append(File.pathSeparator);
      classpath.append(additionalClasspath);
    }

    return classpath.toString();
  }
Builds a command line containing all basic arguments required by java

@return cmdVec - The caller can then add additional arguments
geode-core/src/main/java/org/apache/geode/internal/util/JavaCommandBuilder.java