java-ee

问题 In which order are Servlet.init() and Filter.init() methods called in java web application? Which one is called first? Are all Servlet.init() methods called before than any Filter.doFilter method? 回答1: The filters are always initialized during webapp's startup in the order as they are defined in the web.xml . The servlets are by default initialized during the first HTTP request on their url-pattern only. But you can configure them as well to initialize during webapp's startup using the <load

问题 One chapter in Pragmatic Programmer recommends looking at a blackboard/space-based architecture + a rules engine as a more flexible alternative to a traditional workflow system. The project I'm working on currently uses a workflow engine, but I'd like to evaluate alternatives. I really feel like a SBA would be a better solution to our business problems, but I'm worried about a total lack of community support/user base/venders/options. JavaSpaces is dead, and the JINI spin-off Apache River

问题 I followed the following steps Shutdown Tomcat Deployed a war file with a timestamp of 1st December Start Tomcat - This created the exploded directory for the deployed war file. Stop Tomcat Updated the war file with a new one with a timestamp of 3rd December Restart Tomcat I found that when i restarted Tomcat, the existing files in the folder that was expanded previously were not updated. Shouldnt the update to the war file have updated the relevant jsp, class file? I looked at the

问题 As it currently stands, this question is not a good fit for our Q&A format. We expect answers to be supported by facts, references, or expertise, but this question will likely solicit debate, arguments, polling, or extended discussion. If you feel that this question can be improved and possibly reopened, visit the help center for guidance. Closed 6 years ago . We just started a new project in Java EE in our office and i am required to participate effectively. I mostly work on web applications

问题 If we use JMS request/reply mechanism using "Temporary Queue", will that code be scalable? As of now, we don't know if we will supporting 100 requests per second, or 1000s of requests per second. The code below is what I am thinking of implementing. It makes use of JMS in a 'Synchronous' fashion. The key parts are where the 'Consumer' gets created to point a 'Temporary Queue' that was created for this session. I just can't figure out whether using such Temporary Queues is a scalable design.

问题 If we use JMS request/reply mechanism using "Temporary Queue", will that code be scalable? As of now, we don't know if we will supporting 100 requests per second, or 1000s of requests per second. The code below is what I am thinking of implementing. It makes use of JMS in a 'Synchronous' fashion. The key parts are where the 'Consumer' gets created to point a 'Temporary Queue' that was created for this session. I just can't figure out whether using such Temporary Queues is a scalable design.

问题 As it currently stands, this question is not a good fit for our Q&A format. We expect answers to be supported by facts, references, or expertise, but this question will likely solicit debate, arguments, polling, or extended discussion. If you feel that this question can be improved and possibly reopened, visit the help center for guidance. Closed 6 years ago . Is anyone out there using Drupal for large scale, business critical enterprise applications? Does Drupal's lack of database

问题 I'd like to know how you address the seemingly low productivity of Java EE-based web application development compared to other technology stacks (Seaside, Ruby on Rails, etc). The constraints are: The finished web application must be deployable on Java EE compliant application containers If possible, previous investment in Java-based solution should be preserved, i.e. native interoperability with Java-based systems and libraries should be possible Due to team structure, Java as implementation

问题 Closed . This question needs to be more focused. It is not currently accepting answers. Want to improve this question? Update the question so it focuses on one problem only by editing this post. Closed 4 years ago . Let's share Java based web application architectures! There are lots of different architectures for web applications which are to be implemented using Java. The answers to this question may serve as a library of various web application designs with their pros and cons. While I

问题 I've seen many examples of closing database connections where people use finally{} in the DAO method, but in my case the DAO method (ex: insertUsers()) throws its exceptions to the method it's called. In this case, how can i close my connections? I'm getting the "SQLiteException - Database is locked" error when trying to SELECT + INSERT . Here's my code: DAO public static Connection con = null; private static boolean hasData = false; private void getConnection() throws ClassNotFoundException,