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Yeti
Asked: 2012-09-21 03:19:28 +0800 CST

Manually reload Webbapplication without Tomcat Manager possible?

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I want to reload (or restart) one specific web application on an Apache Tomcat (6 or 7) server without Tomcat Manager or the automatic Reloadable attribute. Using the manager would give again another security risk, and reloadable attribute does not work when you need to upload/copy large files since it already reloads when the upload has not yet finished.

Being root, it should be easy to reload a specific web application, instead of doing a Tomcat service restart (which reloads every web application on it), right?

tomcat

3 Answers

  1. Best Answer

    Use JMX, and only allow attaching from localhost.

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  2. The typical method of re-uploading large files is to just drop a whole new .war file out there, tomcat will redeploy your app "in full". These days you can do parallel deployment https://stackoverflow.com/a/6584259/32453

    Since you mentioned you're root, you could bounce all of tomcat I suppose, as well.

    or the idea I had for it would be to copy all the new files over then just "rename" folders so rename it to your webapps folder somehow after renaming the old one to something else.

    There might also be a way to instruct tomcat to only watch "specific locations" instead of the default (which is at least WEB-INF/lib/*) (context.xml: WatchedResource tag by default is WEB-INF/web.xml).

    so you could copy the files over and then touch a file there.

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  3. Using the manager would give again another security risk

    What security risk are you talking about? 

    wget --http-user=user \
     --http-password=password \
     -q -O - http://localhost:8080/manager/reload?path=/examples

    http://tomcat.apache.org/tomcat-6.0-doc/manager-howto.html#Supported%20Manager%20Commands

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