code: def gatk_cmd(name, jvm_opts, params, config=None):
      
      if name == "gatk":
          if isinstance(config, dict) and "config" not in config:
              data = {"config": config}
          else:
              data = config
          if not data or "gatk4" not in dd.get_tools_off(data):
              return _gatk4_cmd(jvm_opts, params, data)
          else:
              name = "gatk3"
      gatk_cmd = utils.which(os.path.join(os.path.dirname(os.path.realpath(sys.executable)), name))
      # if we can't find via the local executable, fallback to being in the path
      if not gatk_cmd:
          gatk_cmd = utils.which(name)
      if gatk_cmd:
          return "%s && export PATH=%s:\"$PATH\" && %s %s %s" % \
              (utils.clear_java_home(), utils.get_java_binpath(gatk_cmd), gatk_cmd,
               " ".join(jvm_opts), " ".join([str(x) for x in params]))
docs: Retrieve PATH to gatk using locally installed java.