try {
HadoopAccessorService has = Services.get().get(HadoopAccessorService.class);
XConfiguration actionDefaults = has.createActionDefaultConf(actionConf.get(HADOOP_JOB_TRACKER), getType());
XConfiguration.injectDefaults(actionDefaults, actionConf);
has.checkSupportedFilesystem(appPath.toUri());
// Set the Java Main Class for the Java action to give to the Java launcher
setJavaMain(actionConf, actionXml);
parseJobXmlAndConfiguration(context, actionXml, appPath, actionConf);