How to configure Jetty's temporary directories?

Jetty itself has no temporary directories, but each web application can be assigned a directory into which the war is unpacked, JSPs compiled on-the-fly etc.

The algorithm for determining a webapp's temporary directory location is as follows:

1. Try to use an explicit directory specifically for this webapp:
   • Iff webapp.getTempDirectory() is set, use it. Do NOT delete it on jvm exit.
   • Iff javax.servlet.context.tempdir context attribute is set for this webapp && exists && writeable, then use it. Do NOT delete on jvm exit.
2. Create a directory based on global settings. The new directory will be called "Jetty_"host""port""context""+virtualhost :
   • Iff $(jetty.home)/work exists create the directory there. Do NOT delete on jvm exit. Do NOT delete contents if dir already exists.
   • Iff WEB-INF/work exists create the directory there. Do NOT delete on jvm exit. Do NOT delete contents if dir already exists.
   • Else create dir in $(java.io.tmpdir). Set delete on jvm exit. Delete contents if dir already exists.

It is important to note that a temporary directory will have its contents deleted when the webapp is stopped unless either:

• it is called "work"
• it pre-existed the deployment of the webapp

Once a tempory directory has been allocated, a File instance for it is set as the javax.servlet.context.tempdir attribute of the web
application.