final static 变量初始化

public static final Set<String> normalUsers = initRoles("level_2_permissions");

private static Set<String> initRoles(String permissionsLevel){
try {
PropertiesHelper propertiesHelper = new PropertiesHelper(
Constants.CENTER_DEPARTMENT_CONFIG_FILE_PATH);
Iterable levelPermissions = Splitter.on(",").trimResults().omitEmptyStrings()
.split(propertiesHelper.getProperty(permissionsLevel, ""));
return ImmutableSet.copyOf(levelPermissions);
} catch (Exception e) {
dMsg.error(e.getMessage(), e);
}
return new HashSet<>();
}

static final初始化时用方法初始化