I am building Java web applications, and I hate the traditional \"code-compile-deploy-test\" cycle. I want to type in one tiny change, then see the result INSTANTLY, without
Jetty uses memory-mapped files to buffer static content, which causes the file-locking in Windows. Try setting useFileMappedBuffer for DefaultServlet to false.
Troubleshooting Locked files on Windows (from the Jetty wiki) has instructions.