In the feature #3049 alert plugin`s dependency jar will be placed in the ${dolphinscheduler_install_dir}/lib/plugin/alert/xxx-plugin directory .

But now the check-License.sh tool can only check the ${dolphinscheduler_install_dir}/lib/xxx.jar files .

So we need to modify the check-License.sh tool so that it can support the inspection of jars in the sub directory of lib/ .