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Although LCR allows you to see changes without restarting your app, you still need to "build" your project (to compile the Java source into byte code). Your IDE can be set to do this automatically every time you save a file. (In Eclipse, this is done using Project > Build Automatically.) Alternatively, you can manually trigger a build after you save a file. (In Eclipse, this is done using Project > Build, or by pressing Control-B.)

Turn off JVM hot code swapping & automatic restarts

Many servlet containers, including Tomcat and Jetty, support various forms of hot code swapping and/or automatic restarts when file changes are detected. These are generally much slower than LCR and usually should be turned off with Tapestry applications. If you're using RunJettyRun plugin for Eclipse, for example, edit your Run Configuration, and on the Jetty tab, click Show Advanced Options and uncheck the Enable Scanner checkbox.

Tomcat Specifics

See these hints

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