Servlet to create java heap dumps

To create a heap dump for analyzing memory usage one needs to use non-portable API:s. This is example code using suns HotSpotDiagnosticMXBean, but using reflection to avoid compile-time dependency on the sun class library:

public class HeapDumpServlet extends HttpServlet {

    @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        File tmpFile = File.createTempFile("heapdump", ".hprof");
        try {
            MBeanServer server = ManagementFactory.getPlatformMBeanServer();
            // use reflection to avoid compile time dependency on sun classes
            String className = "com.sun.management.HotSpotDiagnosticMXBean";
            Class diagClass = Class.forName(className);
            Object diagBean = ManagementFactory.newPlatformMXBeanProxy(server,
                "com.sun.management:type=HotSpotDiagnostic", diagClass);
            Method dumpHeapMethod = diagClass.getMethod("dumpHeap", String.class, boolean.class);
            dumpHeapMethod.invoke(diagBean, tmpFile.getAbsolutePath(), true);
            response.setContentType("application/octet-stream");
            response.addHeader("Content-Disposition", "attachment; filename=heapdump.hprof");
            IOUtils.copy(new FileInputStream(tmpFile), response.getOutputStream());
        } catch (Exception e) {
            response.setContentType("text/plain");
            response.getWriter().println("ERROR: " + e.getMessage() + "\n" + ExceptionUtils.getFullStackTrace(e));
        } finally {
            tmpFile.delete();
        }
    }

}