I am the author of SimpleCaptcha. While I would recommend — for humanity’s sake — using ReCaptcha where you can, I provided SimpleCaptcha because some organizations have policies which prohibit libraries like ReCaptcha. SimpleCaptcha is meant to be entirely stand-alone, with no external dependencies: as long as you are in a J2EE container, you should … Read more
To set a session-timeout that never expires is not desirable because you would be reliable on the user to push the logout-button every time he’s finished to prevent your server of too much load (depending on the amount of users and the hardware). Additionaly there are some security issues you might run into you would … Read more
I’m very new to Java EE and I’m trying to understand the concept of Local interfaces and Remote interfaces. In the initial versions of the EJB specification, EJBs were “assumed” to be remote components and the only way to invoke them was to make a remote call, using RMI semantics and all the overhead it … Read more
Well, I’ve made some tests, and I’ve also tried the @Decorator way. This still seems to be the best one. @Entity bean and @Stateless bean are the same of the question, while I’ve changed the @Singleton bean as follows, also adding the classic timed cache: @Singleton public class RoomsCached { @Inject Rooms rooms; private List<Room> … Read more
If you want to send back to Action a list of objects you need to specify an index in the name attribute: instead of <s:iterator value=”courseList”> <s:textfield name=”marks” /> </s:iterator> use <s:iterator value=”courseList” status=”ctr”> <s:textfield name=”courseList[%{#ctr.index}].marks” /> </s:iterator>
As javascript is a client side script, it cannot invoke java methods directly which resides on the server Without any particular java frameworks, you could make use of Java Server Pages (JSP) to invoke deleteconfig.initiate() when it receives a GET request from javascript. Sending Request You might also want to use JQuery (a javscript plugin … Read more
Usually cookies are used for session handling. Then all tabs and browser windows share the same session. But you can configure your servlet container to use URL rewrite instead of cookies. (Here is an example for Jetty.) With URL rewrite the session is only identified via a URL parameter containing the session ID. So every … Read more
There’s no such event in Java EE. Yet. As part of JSR375, container managed security will be totally reworked as it’s currently scattered across different container implemantations and is not cross-container compatible. This is outlined in this Java EE 8 Security API presentation. There’s already a reference implementation of Security API in progress, Soteria, developed … Read more
You can add this class, that add all properties from your file to JVM. And add this class like context-listener to web.xml public class InitVariables implements ServletContextListener { @Override public void contextDestroyed(final ServletContextEvent event) { } @Override public void contextInitialized(final ServletContextEvent event) { final String props = “/file.properties”; final Properties propsFromFile = new Properties(); try … Read more
You don’t need a third party library to use jax-ws annotations. J2SE ships with jax-ws, so all the annotations are still available to you. You can achieve lightweight results with the following solution, but for anything optimized/multi-threaded, it’s on your own head to implement: Design a SEI, service endpoint interface, which is basically a java … Read more