code: def _get_jvm_opts(data, out_file):
      
      if get_vardict_command(data) == "vardict-java":
          resources = config_utils.get_resources("vardict", data["config"])
          jvm_opts = resources.get("jvm_opts", ["-Xms750m", "-Xmx4g"])
          jvm_opts += broad.get_default_jvm_opts(os.path.dirname(out_file))
          return "export VAR_DICT_OPTS='%s' && " % " ".join(jvm_opts)
      else:
          return ""
docs: Retrieve JVM options when running the Java version of VarDict.