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• Good book suggestions for building enterprise software

  - by ncoder

  Enterprise software are built using technologies/softwares/terminologies/APIs such as EJB, JBoss, Seam, Hibernate(JPA), Maven, Eclipse, Spring, JTS, JMS, JNDI etc. I know there are great books out there for each of these individually, however can someone suggest a book or two that covers all (or most of) these topics in lesser detail and gives examples of how these are integrated? I have intentionally left the client side stuff out because its highly unlikely a single book would cover that much. If anyone knows of a book (or books) that cover most of or various combinations (like EJB, Hibernate, Spring and Seam) of these technologies, please do suggest the same. The idea is not to become an expert in all however know about them in reasonable detail and why each one is required.

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• Should integration testing of DAOs be done in an application server?

  - by HDave

  I have a three tier application under development and am creating integration tests for DAOs in the persistence layer. When the application runs in Websphere or JBoss I expect to use the connection pooling and transaction manager of those application servers. When the application runs in Tomcat or Jetty, we'll be using C3P0 for pooling and Atomikos for transactions. Because of these different subsystems, should the DAO's be tested in a fully configured application server environment or should we handle those concerns when integration testing the service layer? Currently we plan on setting up a simple JDBC data source with non-JTA (i.e. resource-local) transactions for DAO integration testing, thus no application server is involved....but this leaves me wondering about environmental problems we won't uncover.

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• Can the JVM recover from an OutOfMemoryError without a restart

  - by askullhead

  Can the JVM recover from an OutOfMemoryError without a restart if it gets a chance to run the GC before more object allocation requests come in? Do the various JVM implementations differ in this aspect? EDIT: My question was about the JVM recovering and not the user program trying to recover by catching the error. In other words if an OOME is thrown in an application server (jboss/websphere/..) do I have to restart it? Or can I let it run if further requests seem to work without a problem. Sorry if that wan't clear.

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• Besides EAR and EJB, what do I get from a J2EE app server that I don't get in a servlet container li

  - by dacracot

  We use Tomcat to host our WAR based applications. We are servlet container compliant J2EE applications with the exception of org.apache.catalina.authenticator.SingleSignOn. We are being asked to move to a commercial J2EE application server. The first downside to changing that I see is the cost. No matter what the charges for the application server, Tomcat is free. Second is the complexity. We don't use either EJB nor EAR features (of course not, we can't), and have not missed them. What then are the benefits I'm not seeing? What are the drawbacks that I haven't mentioned? Mentioned were... JTA - Java Transaction API - We control transaction via database stored procedures. JPA - Java Persistence API - We use JDBC and again stored procedures to persist. JMS - Java Message Service - We use XML over HTTP for messaging. This is good, please more!

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• What's your motivation to help others at stackoverflow?

  - by Bernhard V

  Hi! I gotta say that this site is really great because it helped me a lot at my job. I'm mostly the one asking the questions rather than answering it. Now I'd like to know what's your motivation to help others of whom you only know their nicknames? Because contrary to other communities on the Internet, this site lacks things like a message board where you can talk about all things in life or a function for private messaging. And in my opinion these two things normally help in building kind of a "social" environment. Also stackoverflow has probably lot's of users and is therefore not that tight-knitted. Maybe you can share some your thoughts with me.

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• Trying to Unit Test A Class That Makes DB Queries Using Hibernate And Can't Get Session Created...

  - by Jared Michaels

  I am trying to implement JUnit tests for a class that performs DB queries using Hibernate. When I create the class under test, I get access to the session through the factory by doing the following: InitialContext context = new InitialContext(); sessionFactory = (SessionFactory) context.lookup(hibernateContext); This works fine when I deploy this to JBoss 5.1. I am trying to figure out how to get this to work with my JUnit test. I keep getting an exception stating that I "Need to specify class name in environment or system property, or as an applet parameter, or in an application resource file: java.naming.factory.initial". I've searched high and low but haven't been able to find any information about what specifically I need to do to get this to work. I am not using Spring or any frameworks, just plain old Java and JUnit.

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• Workaround for richfaces combobox hotkey bug

  - by John

  Hi, Does anyone know a workaround for the bug https://jira.jboss.org/jira/browse/RF-8076 ? Just to clarify things, we have a form with multiple inputs, one of them being a combobox with auto complete features. We've setup a hotkey via <rich:hotKey key="return" ... /> It works great everywhere except in the combobox, and I would really like to get it working on the combobox as well. The behaviour I want when the ENTER key is pressed inside the combobox is: If the combobox context was modified by auto complete then do nothing Else action the event on ENTER key pressed We're running on seam/richfaces. I'm open to any workaround, but simplicity is much sought for. Thanks!

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• Is it possible to mix orm.xml definitions with annotations when using JPA/hibernate ?

  - by hatchetman82

  I'm working on an application whihc supports using several DB vendors, with the table definitions being different for each DB type. The trouble is that the column definitions are not what hibernate expects, and so my entities contain a lot of @Column(..columnDefintion="..."...) annotations. To further complicate the issue, there's no way to specify a columnDefinition per DB. So I tried moving just the columnDefinition bits to an orm.xml file, and I have a Maven profile that bundles the correct file. JBoss 4.0.5/Hibernate 3.2.0GA fails to validate, and it seems it completely disregards the annotations given an xml file. Is there a way to make Hibernate "merge" the data from the xml with the annotations ?

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• Server-side technology for a game

  - by Soonts

  We’re creating a massively-multiplayer social game. We expect up to 1 million concurrent users. The game is not real-time, instead it’s turn-based. We need reliable messaging between our clients and the server, preferably over HTTP protocol. Besides the multiplayer functionality, we’ll also need a content delivery service. Could you please recommend a server-side technology for us, so we’ll start searching for the right people to hire? Is it correct assumption that no single server will hold that amount of load so it must scale horizontally? Will Windows Azure do the job? Thanks in advance.

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• How to use SMS content provider? Where are the docs?

  - by Mark

  Hi, I'd like to be able to read the system's SMS content provider. Basically I wanted to make an SMS messaging app, but it would only be useful if I could see past threads etc. It seems like there's a content provider for this, but I can't find documentation for it - anyone know where that is? Thanks -------- edit ----------- Ok I found a way to get the sms inbox provider, and I just dumped all the column names in that provider, looks like this: Uri uriSms = Uri.parse("content://sms/inbox"); Cursor c = context.getContentResolver().query(uriSms, null,null,null,null); // column names for above provider: 0: _id 1: thread_id 2: address 3: person 4: date 5: protocol 6: read 7: status 8: type 9: reply_path_present 10: subject 11: body 12: service_center 13: locked I'm just piecing this together from random threads I find around the net, I'm really wondering where this is all documented (if at all)? Thanks again

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• What should the Java main method be for a standalone application (for Spring JMS) ?

  - by Brandon

  I am interested in creating a Spring standalone application that will run and wait to receive messages from an ActiveMQ queue using Spring JMS. I have searched a lot of places and cannot find a consistent way of implementing the main method for such a standalone application. There appears to be few examples of Spring standalone applications. I have looked at Tomcat, JBoss, ActiveMQ and other examples from the around the web but I have not come to a conclusion so ... What is the best practice for implementing a main method for a Java application (specifically Spring with JMS) ?

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• How to Command Query Responsibility Segregation (CQRS) with ASP.NET MVC?

  - by Jeffrey

  I have been reading about Command Query Responsibility Segregation (CQRS). I sort of wonder how would this work with ASP.NET MVC? I get the idea of CQRS conceptually it sounds nice and sure does introduce some complexities (event and messaging pattern) compared to the "normal/common" approach . Also the idea of CQRS sort of against the use of ORM in some ways. I am trying to think how I could use this pattern in the coming projects so if anyone has experience in combining CQRS with ASP.NET MVC and NHibernate please give some concrete examples to help me better understand CQRS and use with ASP.NET MVC. Thanks!

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• Should you restrict developers internet access?

  - by Craig HB

  Our (small to medium-sized) company is going to start enforcing an internet policy which everyone, including the team of 4 senior developers, will be subject to. Amongst other things, this means that developers will not be able to access: web based e-mail (Hotmail, Yahoo, Googlemail) instant messaging accounts (MSN Messenger) social networking sites (Facebook) streaming media (internet radio) At the moment, we don't have any restrictions on our internet use, so I really want to find out what the effect on the team will be. Please let me know your thoughts. What effect do you think this will have on the team (positive or negative).

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• Deploying Multiple Environments in Spring-MVC

  - by jboyd

  Currently all web apps are deployed using seperate config files: <!-- <import bean.... production/> --> <import bean... development/> This has disadvantages, even if you only need to swap out one config file, that I'm sure everyone is familiar with (wondering what just deployed without searching through XML is one of them) I want to add Logging to my application that basically says 'RUNNING IN PRODUCTION MODE', with a description of the services deployed and what mode they are working in. RUNNING IN PRODUCTION MODE Client Service - Production Messaging Service - Local and so on... Is this possible in Spring using a conventional deployment (putting a war on a server)? What other things do people do to manage deployments and software configurations? If not, what other ways could you achieve something similar?

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• Avoid copying of data between user and kernel space and vice-versa

  - by bala1486

  Hello, I am developing a active messaging protocol for parallel computation that replaces TCP/IP. My goal is to decrease the latency of a packet. Since the environment is a LAN, i can replace TCP/IP with simpler protocol to reduce the packet latency. I am not writing any device driver and i am just trying to replace the TCP/IP stack with something simpler. Now I wanted to avoid copying of a packet's data from user space to kernel space and vice-versa. I heard of the mmap(). Is it the best way to do this? If yes, it will be nice if you can give links to some examples. I am a linux newbie and i really appreciate your help.. Thank you... Thanks, Bala

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• What should I learn to improve my Java skills ?

  - by hory.incpp

  Hello, I currently know Java SE and I want to learn something more 'enterprise'. I would like something more distributed (app server, server programming, web, content management system ...) but any suggestion is ok. There are many frameworks which I've heard: spring, hibernate, persistence, ejb, jsp, servlet, jsf, jboss, glassfish, ant etc etc etc etc. I'm very confused where to start. So the question is: Can somebody explain to me what actually there frameworks are; and which one should I start with ? Thank you.

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• Is there a semi-standard way to associate a URL with an IRC user?

  - by DRMacIver

  I'm in the process of doing some identity consolidation, so I'm providing URLs to me at various locations on the internet. I'm quite active on IRC, so this naturally lead me to wonder whether there was a way to provide a link to my IRC presence. This lead to me finding http://www.w3.org/Addressing/draft-mirashi-url-irc-01.txt which appears to be a draft of an RFC for associating URLs with IRC, which suggests that I would be irc://irc.freenode.net/DRMacIver,isnick Which seems a little on the lame side. Further, this RFC draft has very thoroughly expired (February 28 1997). On the other hand it seems to be implemented in chatzilla at least: http://www.mozilla.org/projects/rt-messaging/chatzilla/irc-urls.html So does anyone know if there's a superseding RFC and/or any other de facto standard for this?

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• Allow for modular development while still running in same JVM?

  - by Marcus

  Our current app runs in a single JVM. We are now splitting up the app into separate logical services where each service runs in its own JVM. The split is being done to allow a single service to be modified and deployed without impacting the entire system. This reduces the need to QA the entire system - just need to QA the interaction with the service being changed. For inter service communication we use a combination of REST, an MQ system bus, and database views. What I don't like about this: REST means we have to marshal data to/from XML DB views couple the systems together which defeats the whole concept of separate services MQ / system bus is added complexity There is inevitably some code duplication between services You have set up n JBoss server configurations, we have to do n number of deployments, n number of set up scripts, etc, etc. Is there a better way to structure an internal application to allow modular development and deployment while allowing the app to run in a single JVM (and achieving the associated benefits)?

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• How to deploy jar artifacts directly from a maven repository to appserver specific directories

  - by Joshua

  I have JDBC driver dependencies (e.g. h2, mysql ..) which have to be copied under ${jboss.home}/common/lib before it is used by my EAR application. What would be the best way to directly copy from a maven repository into the above location instead of doing a manual copy. I would not prefer to store copies of the drivers as part of my SVN. Note: I currently specify this as a maven dependency and copy this artifact from the local repository, not sure if this is the best way to do solve this.

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• Scaling Java applications - existing cluster-aware IoC frameworks?

  - by Zoltan

  Most people use some kind of an IoC framework - Guice, Spring, you name it. Many of us need to scale their applications too, so they complicate their lifes with Terracotta, Glassfish/JBoss/insertyourfavouritehere clusters. But is it really the way to go? Are you using any of the above? Here's some ideas we currently have implemented in a yet-to-be-opensourced framework, and I'd like to see what you think of it, or maybe "it's a complete ripoff of XY!". cluster-wide object replication - give it a name, and whenever you do something (in any node) on such an object, it will get replicated - with different guarantees do transparent soft-loadbalancing - simplest scenario: restful webservice method call proxied to an other node view-only node injection: inject a proxy to a "named" object, and get your calls automatically proxied to a node Would you use something like that? Is there a current, stable, enterprise-ready implementation out there?

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• How to allow for modular development while still running in same JVM?

  - by Marcus

  Our current app runs in a single JVM. We are now splitting up the app into separate logical services where each service runs in its own JVM. The split is being done to allow a single service to be modified and deployed without impacting the entire system. This reduces the need to QA the entire system - just need to QA the interaction with the service being changed. For interservice communication we use a combination of REST, an MQ system bus, and database views. What I don't like about this: REST means we have to marshal data to/from XML DB views couple the systems together which defeats the whole concept of separate services MQ / system bus is added complexity There is inevitably some code duplication between services You have set up n JBoss server configurations, we have to do n number of deployments, n number of set up scripts, etc, etc. Is there a better way to structure an internal application to allow modular development and deployment while allowing the app to run in a single JVM (and achieving the associated benefits)?

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• saving appengine mail from spam filters

  - by Fh

  One of my clients uses Trend Micro InterScan Messaging Security to protect their internal mail services. Suddenly InterScan decided to filter out all messages coming from Google App Engine. Unfortunately they haven't been able to whitelist the sender address as each e-mail gets a different one. For example, *3ckihSOVMMHlZHSL.JSMMHlZHSL.JS*@apphosting.bounces.google.com, with everything before the @ being variable. Update I'm including this screenshot of how Interscan sees the incoming e-mail. Notice that all senders are different: If I look into the e-mail headers, the apphosting domain appears inside the Return-Path field: Return-Path: <36kSiSwYIBh0883XL3E7.5EH883XL3E7.5E@apphosting.bounces.google.com> The "From" field looks ok. It says what I set it to say, but the spam filter only looks at the Return-Path. My client sysadmin doesn't want to whitelist the whole apphosting domain, as it wouldn't be only whitelisting my application. How could I bypass this e-mail filters if I can't get an unique sender? Thanks,

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• BULK SMS, Long Codes (VMN MSIDN), T-mobile?

  - by John

  Does any US wireless carrier offer individuals or companies with a direct connection to the SMSC? The number is 747-772-3101 (repalce 7's with 6's) This number is registered to t-mobile, also verified by t-mobile to be a valid subscriber sending 160,000+ text messages monthly and that all they have is an unlimited text messaging plan on top of the cheapest voice plan. This company of the number verified to me that they don't use gsm modems as they are too slow. So I know it's possible but who would I contact, Sales or anyone else reachable through a 1-800 is ignorant to these services and developer.t-mobile is worthless and doesn't reply to emails. Any info??

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• Question about when and when not to raise events (C#)

  - by NoPyGod

  I am programming an instant messaging library for MSN Messenger, and I have a simple question about raising events. When logging in, should I be raising UserAdded for each user that is synchronized (already on the contact list), or should the UserAdded event be reserved for when a new user has been added to the contact list via the AddUser method? Should I perhaps use another event, UserDownloaded for when a user is downloaded? Similarly, when I call logout, should I call UserRemoved? I hope this makes sense. Thank you

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• migrate database from sybase to mysql

  - by jindalsyogesh

  I have been trying to migrate a database from sybase to Mysql. This is my approach: Generate pojo classes from my sybase database using hibernate in eclipse Use these pojo classes to generate the schema in mysql database Then somehow migrate the data from sybase to mysql I guess this approach should work??? Please let me know if there is any better or easier approach. The thing is I am not even able to get the first step done. I added hibernate plugin in eclipse from this link: [http://download.jboss.org/jbosstools/updates/stable/][1] I added sybase jar file to my project classpath Then I added hibernate console configuration file Then I added hibernate configuration file Then I added hibernate code generation configuration When I try to run the code generation configuration file, I am getting java.lang.NullPointerException and I have no idea how to fix it. I searched a lot of forums, tried to google it, but I not able to find any solution. Can anybody tell me what mistake I am making here or point to some hibernate tutorial for eclipse??

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