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• Using <input type=file /> with J2EE/MySQL Backend

  - by Mark Hazlett

  Hey everyone, I'm wondering how I can hook up an input type=file to send a picture back to a backend servlet that will eventually be stored in a MySQL database as a BLOB? In other words, how can I upload a picture using the input and send that back to the servlet to insert into the database as a BLOB type? Thanks

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• Is there an Open Source J2EE Server that works with IIS 7

  - by Sandy

  I have a (old) web app that is using Jrun and IIS. I would like to replace JRun with something free and OS. Can you recommend something that I can just install and copy the app jar files over and be up and running?

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• how to obtain the relative path of a resource in a j2ee project

  - by Neeraj

  I have a Dynamic Web Project having a flat file (or say text file). I have created a servlet in which I need to use this file. My code is as following: protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { // String resource = request.getParameter ("json") ; if ( resource != null && !resource.equals ( "" ) ) { //use getResourceAsStream ( ) to properly get the file. InputStream is = getServletContext ().getResourceAsStream ("rateJSON") ; if ( is != null ) { // the resource exists response.setContentType("application/json"); response.setHeader("Pragma", "No-cache"); response.setDateHeader("Expires", 0); response.setHeader("Cache-Control", "no-cache"); StringWriter sw = new StringWriter ( ) ; for ( int c = is.read ( ) ; c != -1; c = is.read ( ) ) { sw.write ( c ) ; } PrintWriter out = response.getWriter(); out.print (sw.toString ()) ; out.flush(); } } } The problem is that the InputStream is has null value. I'm not sure how to get the correct relative path. I'm using JBOSS as the app server. I have added the resource file in the WebContent directory of a Dynamic Web Project. As a different approch, I tried this: protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { // TODO Auto-generated method stub ServletConfig config = getServletConfig(); String contextName = config.getInitParameter("ApplicationName"); System.out.println("context name"+ contextName); String contextPath = config.getServletContext().getRealPath(contextName); System.out.println("context Path"+contextPath); //contextPath = contextPath.substring(0, contextPath.indexOf(contextName)); contextPath += "\\rateJSON.txt"; System.out.println(contextPath); String resource = request.getParameter ("json") ; System.out.println("Hi there1"+resource); if ( resource != null && !resource.equals ( "" ) ) { System.out.println("Hi there"); //use getResourceAsStream ( ) to properly get the file. //InputStream is = getServletContext ().getResourceAsStream (resource) ; InputStream is = getServletConfig().getServletContext().getResourceAsStream(contextPath); if ( is != null ) { // the resource exists System.out.println("Hi there2"); response.setContentType("application/json"); response.setHeader("Pragma", "No-cache"); response.setDateHeader("Expires", 0); response.setHeader("Cache-Control", "no-cache"); StringWriter sw = new StringWriter ( ); for ( int c = is.read ( ) ; c != -1; c = is.read ( ) ) { sw.write ( c ) ; System.out.println(c); } PrintWriter out = response.getWriter(); out.print (sw.toString ()) ; System.out.println(sw.toString()); out.flush(); } } } The value of contextPath is now: C:\JBOSS\jboss-5.0.1.GA\server\default\tmp\4p72206b-uo5r7k-g0vn9pof-1-g0vsh0o9-b7\Nationwide.war\WEB-INF\rateJSON But at this location the rateJSON file is not there? It seems JBOSS is not putting this file in the App.war or doesn't deploy it??? Could someone please help me?

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• user access management in j2ee web application

  - by kawtousse

  Hi everyone, I am working with jsp/servlet project and i have to complete the module of access management to my jsps since I have more than one user with different profile. I defined a table in my database wich resume the profil and the url permitted like that: id_profil :1 url : http://localhost/...xyz.jsp id page 1 Now I am trying to let the menu modified appropriately to the id_profil of the logged user. So there are pages allowed in one profile but must be hidden to others. I have no idea since now how to realize this and it is so important for me. thanks for your help.

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• How to model in J2EE / JEE?

  - by Harry

  Let's say, I have decided to go with J(2)EE stack for my enterprise application. Now, for domain modelling (or: for designing the M of MVC), which APIs can I safely assume and use, and which I should stay away from... say, via a layer of abstraction? For example, Should I go ahead and litter my Model with calls to Hibernate/JPA API? Or, should I build an abstraction... a persistence layer of my own to avoid hard-coding against these two specific persistence APIs? Why I ask this: Few years ago, there was this Kodo API which got superseded by Hibernate. If one had designed a persistence layer and coded the rest of the model against this layer (instead of littering the Model with calls to specific vendor API), it would have allowed one to (relatively) easily switch from Kodo to Hibernate to xyz. Is it recommended to make aggressive use of the *QL provided by your persistence vendor in your domain model? I'm not aware of any real-world issues (like performance, scalability, portability, etc) arising out of a heavy use of an HQL-like language. Why I ask this: I would like to avoid, as much as possible, writing custom code when the same could be accomplished via query language that is more portable than SQL. Sorry, but I'm a complete newbie to this area. Where could I find more info on this topic? Many thanks in advance. /HS

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• How do I make "simple" throughput j2ee-filter?

  - by Tommy

  I'm looking to create a filter that can give me two things: number of request pr minute, and average responsetime pr minute. I already got the individual readings, I'm just not sure how to add them up. My filter captures every request, and it records the time each request takes: public void doFilter(ServletRequest request, ...() { long start = System.currentTimeMillis(); chain.doFilter(request, response); long stop = System.currentTimeMillis(); String time = Util.getTimeDifferenceInSec(start, stop); } This information will be used to create some pretty Google Chart charts. I don't want to store the data in any database. Just a way to get current numbers out when requested As this is a high volume application; low overhead is essential. I'm assuming my applicationserver doesn't provide this information.

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• What's the (memory) footprint of a J2EE servlet?

  - by Amr Mostafa

  For Jetty, Tomcat, or any other servlet container of your choice, what's the average footprint (memory, and any other notable resources) of a basic servlet? This includes any other basic objects that you almost always need per servlet, such as a view resolver. I'm not looking for a quantitative number in particular, but any indicative answer that could give an idea of how "heavy" or "lightweight" a servlet is. Thanks in advance

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• What do I use for a J2ee website?

  - by johnny

  Not sure if I asked this correctly. I am trying to see what I need to create an website that uses MVC and that connects to legacy multiple databases, brining back those database info into one page. I wanted the site to be MVC but am not sure where to begin. Do I use Spring? What do I use for an server? Jboss and apache? Hibernate? I'm just kind of lost on how to proceed. It's not a straight forward a asp.net mvc or a php framwork. A major concern is the collection of data from multiple legacy databases and bringing that data back into one page. Thanks.

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• How to change a Datasource's username/password at runtime in a J2EE app?

  - by Toto

  I've deployed a web-module which connects to the database via a datasource configured in the J2EE application server. Currently, the user/password for the database connection is set in the proper J2EE application server's datasources configuration file. I want to change during runtime the datasource's user/password. (e.g.: implement a new web form in which the user is asked to enter de user/password to be used in the database connection). Is there a standard way to do that in J2EE applications or it depends on the J2EE application server? In this case I'm using Orion application server.

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• exact answer for “what is j2ee?” - job interview

  - by shuuchan

  I'd like to ask if someone of you knows the exact meaning of JEE. That's because a collegue of mine was asked this question in a job interview, and was "unable to answer properly"... to speak with his interwiewer's words. And when he told me what he said to his interviewer I got really surprised, since it was more or less what I would have answered myself - in a concise form, the first paragraph of this article. J2EE (Java 2 Platform, Enterprise Edition) is a Java platform designed for the mainframe-scale computing typical of large enterprises. Sun Microsystems (together with industry partners such as IBM) designed J2EE to simplify application development in a thin client tiered environment. J2EE simplifies application development and decreases the need for programming and programmer training by creating standardized, reusable modular components and by enabling the tier to handle many aspects of programming automatically. That seems not to be enough, since the interviewer asked for "more precise and less general definition". Is there really a more precise definition for JEE? Or did my colleague just find the fussiest-interviewer-ever? :)

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• j2ee implementing security and using a framwork pros and cons

  - by Ismail Marmoush

  I'm a newbie to j2ee security, and i'm not j2ee expert either, though i'm really willing to put some effort and learn I've an application that i'm about to develop on Google App Engine (GAE) --with no time constraints. As you know GAE handles a lot of web container security issues for you, also I will be using openID for authentication exclusively (sessions will be handled by provider). GAE supports SSL which will help with confidentiality and integrity maybe. Authorization can be done through filters. I know reinventing the wheel is a mess, but I was looking forward to learn something about security and implement that in my new app. so what the pros and cons of using a framework like shiro, spring security, jguard etc or filling the rest of gaps on my own ?

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• Using virtualization infrastructure for J2EE application distribution- viable alternative?

  - by Dan

  Our company builds custom J2EE web solutions. At the moment, we use standard J2EE distribution mechanisms (ear/war archives). Application servers are generally administered by our clients' IT departments and since we do not have complete control over the environment, a lot of entropy can be introduced into the solution. For example: latest app. server patch not applied conflicting third party libraries inside the app. server root server runtime and tuning parameters not configured (for example, number of connections in database pool) We are looking into using virtualization infrastructure for J2EE application distribution. Instead of sending the ear/war archive, we’d send image with application server node and our application preinstalled. Some of the benefits are same as using with using virtualization infrastructure in general, namely better use of hardware resources. For us, it reduces the entropy of hosting infrastructure - distributing VM should be less affected by hosting environment. So far, the downside I see can be in application server licenses, here they will have to use dedicated servers for our solution, but this is generally already done that way. Also, there is a complexity with maintaining virtualization infrastructure, but this is often something IT departments have more experience with than with administering and fine-tuning J2EE solutions. Anyone has experience with this model? What are the downsides? Will we not just replace one type of complexity with other?

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• Is it possible to virtualize war file execution without separate J2EE container deployments?

  - by Smith

  Let's say I want to allow my developers to upload their war files to a web app (not the application server itself) running on our intranet and that web app would then run those wars as if they were separate apps deployed individually in our J2EE container. In other words, we are not actually deploying the wars as separate apps in the container - they are simply running side-by-side inside this one web app that acts like a J2EE container. Is that possible? Something like a war virtualization app?

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• Is it possible to virtualize war file execution without separate J2EE container deployments?

  - by Smith

  Let's say I want to allow my developers to upload their war files to a web app (not the application server itself) running on our intranet and that web app would then run those wars as if they were separate apps deployed individually in our J2EE container. In other words, we are not actually deploying the wars as separate apps in the container - they are simply running side-by-side inside this one web app that acts like a J2EE container. Is that possible? Something like a war virtualization app?

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• New to J2EE; architecture suggestions for a service/daemon?

  - by Kate

  I am brand new to the J2EE world. As an exercise to try and familiarize myself with J2EE, I'm trying to create a tiered web-app, but I'm getting a little stuck on what the best way is to spin up a service in the background that does work. Paramters of the service: It must open and hold a socket connection and receive information from the connected server. There is a 1-to-1 correlation between a user and a new socket connection. So the idea is the user presses a button on the web-page, and somewhere on the server a socket connection is opened. For the remainder of the users session (or until the user presses some sort of disconnect button) the socket remains open and pushes received information to some sort of centralized store that servlets can query and return to the user via AJAX. Is there a J2EE type way to handle this situation? Naturally what I would think to do is to just write a Java application that listens on a port that the servlets can connect to and spawns new threads that open these sockets, but that seems very ad-hoc to me. (PS: I am also new to Stack Overflow, so forgive me if it takes me some time to figure the site out!)

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• Questions every good Java/J2EE Developer should be able to answer?

  - by Rachel

  I was going through Questions every good .Net developer should be able to answer and was highly impressed with the content and approach of this question, and so in the same spirit, I am asking this question for Java/J2EE Developer. What questions do you think should a good Java/J2EE programmer be able to answer? I am marking this question as community wiki as it is not user specific and it aims to serve programming community at large. Looking forward for some amazing responses. EDIT: Please answer questions too, as suggested in the comments, so that people could learn something new regarding the language, too.

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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 tag libraries you know for J2EE JSP, something like displaytag ?

  - by DFG

  What tag libraries you know for J2EE - JSP, something like displaytag ?

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• Can't install Oracle J2EE due to "An internal Error has occurred"

  - by Gabriel Mendez

  I am trying to install Oracle JavaEE 6 SDK with Glassfish on Ubuntu 12.04 with Java SDK 7. I have downloaded java_ee_sdk-6u4-jdk7-linux-x64.sh already, but when I run it on terminal, the wizard appears, and after few steps, I get an Error Message Dialog: An internal Error has occurred. Please contact your system administrator... null. And, the terminal is showing something like WARNING: Could not process a navigation event for command=AC_NEXT [Command=AC_NEXT Error=null ] What can I do? How can I install J2EE/Glassfish under linux x64?

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• Business Layer Design in J2EE Project

  - by user63157

  Currently the project on which I am working is being developed with Spring, Hibernate and struts. The business layer consists of simple java beans with no behavior in them only properties and getter and setter methods, the services are written on them which operates on them and call DAO layer methods and all. My questions is that is it object oriented way of designing or simply the procedure way in which the data and the functions on which they operate are not together. Please provide your thoughts and inputs on how the business logic is design and implemented in j2ee application, is the domain model contains business methods or are they simply dumb objects which have only data and services written on to them.

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• Error while detecting start profile for instance with ID _u

  - by Techboy

  I am upgrading a SAP Java instance and am getting the error shown in the log below. There are not backup profile files in the profiles directory. The string _u does not exist in the default, start or instance profile for instance SCS01. Please can you suggest what the issue might be? Mar 13, 2010 12:09:01 PM [Info]: com.sap.sdt.ucp.phases.AbstractPhaseType.initializexAbstractPhaseType.javax758x [Thread[main,5,main]]: Phase PREPARE/INIT/DETERMINE_PROFILES has been started. Mar 13, 2010 12:09:01 PM [Info]: com.sap.sdt.ucp.phases.AbstractPhaseType.initializexAbstractPhaseType.javax759x [Thread[main,5,main]]: Phase type is com.sap.sdt.j2ee.phases.PhaseTypeDetermineProfiles. Mar 13, 2010 12:09:01 PM [Info]: ...ap.sdt.j2ee.phases.PhaseTypeDetermineProfiles.checkVariablesxPhaseTypeDetermineProfiles.javax284x [Thread[main,5,main]]: All 4 required variables exist in variable handler. Mar 13, 2010 12:09:01 PM [Info]: ....j2ee.tools.sysinfo.AbstractInfoController.updateProfileVariablexAbstractInfoController.javax302x [Thread[main,5,main]]: Parameter /J2EE/StandardSystem/DefaultProfilePath has been detected. Parameter value is \server1\SAPMNT\PI7\SYS\profile\DEFAULT.PFL. Mar 13, 2010 12:09:01 PM [Info]: com.sap.sdt.j2ee.tools.sysinfo.ProfileDetector.detectInstancexProfileDetector.javax340x [Thread[main,5,main]]: Instance SCS01 with profile \server1\SAPMNT\PI7\SYS\profile\PI7_SCS01_server1, start profile \server1\SAPMNT\PI7\SYS\profile\START_SCS01_server1, and host server1 has been detected. Mar 13, 2010 12:09:01 PM [Error]: com.sap.sdt.ucp.phases.AbstractPhaseType.doExecutexAbstractPhaseType.javax862x [Thread[main,5,main]]: Exception has occurred during the execution of the phase. Mar 13, 2010 12:09:01 PM [Error]: com.sap.sdt.j2ee.tools.sysinfo.ProfileDetector.detectInstancexProfileDetector.javax297x [Thread[main,5,main]]: Error while detecting start profile for instance with ID _u. Mar 13, 2010 12:09:01 PM [Info]: com.sap.sdt.ucp.phases.AbstractPhaseType.cleanupxAbstractPhaseType.javax905x [Thread[main,5,main]]: Phase PREPARE/INIT/DETERMINE_PROFILES has been completed. Mar 13, 2010 12:09:01 PM [Info]: com.sap.sdt.ucp.phases.AbstractPhaseType.cleanupxAbstractPhaseType.javax906x [Thread[main,5,main]]: Start time: 2010/03/13 12:09:01. Mar 13, 2010 12:09:01 PM [Info]: com.sap.sdt.ucp.phases.AbstractPhaseType.cleanupxAbstractPhaseType.javax908x [Thread[main,5,main]]: End time: 2010/03/13 12:09:01. Mar 13, 2010 12:09:01 PM [Info]: com.sap.sdt.ucp.phases.AbstractPhaseType.cleanupxAbstractPhaseType.javax909x [Thread[main,5,main]]: Duration: 0:00:00.078. Mar 13, 2010 12:09:01 PM [Info]: com.sap.sdt.ucp.phases.AbstractPhaseType.cleanupxAbstractPhaseType.javax910x [Thread[main,5,main]]: Phase status is error.

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• J2EE Applications, SPARC T4, Solaris Containers, and Resource Pools

  - by user12620111

  I've obtained a substantial performance improvement on a SPARC T4-2 Server running a J2EE Application Server Cluster by deploying the cluster members into Oracle Solaris Containers and binding those containers to cores of the SPARC T4 Processor. This is not a surprising result, in fact, it is consistent with other results that are available on the Internet. See the "references", below, for some examples. Nonetheless, here is a summary of my configuration and results. (1.0) Before deploying a J2EE Application Server Cluster into a virtualized environment, many decisions need to be made. I'm not claiming that all of the decisions that I have a made will work well for every environment. In fact, I'm not even claiming that all of the decisions are the best possible for my environment. I'm only claiming that of the small sample of configurations that I've tested, this is the one that is working best for me. Here are some of the decisions that needed to be made: (1.1) Which virtualization option? There are several virtualization options and isolation levels that are available. Options include: Hard partitions:  Dynamic Domains on Sun SPARC Enterprise M-Series Servers Hypervisor based virtualization such as Oracle VM Server for SPARC (LDOMs) on SPARC T-Series Servers OS Virtualization using Oracle Solaris Containers Resource management tools in the Oracle Solaris OS to control the amount of resources an application receives, such as CPU cycles, physical memory, and network bandwidth. Oracle Solaris Containers provide the right level of isolation and flexibility for my environment. To borrow some words from my friends in marketing, "The SPARC T4 processor leverages the unique, no-cost virtualization capabilities of Oracle Solaris Zones"  (1.2) How to associate Oracle Solaris Containers with resources? There are several options available to associate containers with resources, including (a) resource pool association (b) dedicated-cpu resources and (c) capped-cpu resources. I chose to create resource pools and associate them with the containers because I wanted explicit control over the cores and virtual processors.  (1.3) Cluster Topology? Is it best to deploy (a) multiple application servers on one node, (b) one application server on multiple nodes, or (c) multiple application servers on multiple nodes? After a few quick tests, it appears that one application server per Oracle Solaris Container is a good solution. (1.4) Number of cluster members to deploy? I chose to deploy four big 64-bit application servers. I would like go back a test many 32-bit application servers, but that is left for another day. (2.0) Configuration tested. (2.1) I was using a SPARC T4-2 Server which has 2 CPU and 128 virtual processors. To understand the physical layout of the hardware on Solaris 10, I used the OpenSolaris psrinfo perl script available at http://hub.opensolaris.org/bin/download/Community+Group+performance/files/psrinfo.pl: test# ./psrinfo.pl -pv The physical processor has 8 cores and 64 virtual processors (0-63) The core has 8 virtual processors (0-7)   The core has 8 virtual processors (8-15)   The core has 8 virtual processors (16-23)   The core has 8 virtual processors (24-31)   The core has 8 virtual processors (32-39)   The core has 8 virtual processors (40-47)   The core has 8 virtual processors (48-55)   The core has 8 virtual processors (56-63)     SPARC-T4 (chipid 0, clock 2848 MHz) The physical processor has 8 cores and 64 virtual processors (64-127)   The core has 8 virtual processors (64-71)   The core has 8 virtual processors (72-79)   The core has 8 virtual processors (80-87)   The core has 8 virtual processors (88-95)   The core has 8 virtual processors (96-103)   The core has 8 virtual processors (104-111)   The core has 8 virtual processors (112-119)   The core has 8 virtual processors (120-127)     SPARC-T4 (chipid 1, clock 2848 MHz) (2.2) The "before" test: without processor binding. I started with a 4-member cluster deployed into 4 Oracle Solaris Containers. Each container used a unique gigabit Ethernet port for HTTP traffic. The containers shared a 10 gigabit Ethernet port for JDBC traffic. (2.3) The "after" test: with processor binding. I ran one application server in the Global Zone and another application server in each of the three non-global zones (NGZ):  (3.0) Configuration steps. The following steps need to be repeated for all three Oracle Solaris Containers. (3.1) Stop AppServers from the BUI. (3.2) Stop the NGZ. test# ssh test-z2 init 5 (3.3) Enable resource pools: test# svcadm enable pools (3.4) Create the resource pool: test# poolcfg -dc 'create pool pool-test-z2' (3.5) Create the processor set: test# poolcfg -dc 'create pset pset-test-z2' (3.6) Specify the maximum number of CPU's that may be addd to the processor set: test# poolcfg -dc 'modify pset pset-test-z2 (uint pset.max=32)' (3.7) bash syntax to add Virtual CPUs to the processor set: test# (( i = 64 )); while (( i < 96 )); do poolcfg -dc "transfer to pset pset-test-z2 (cpu $i)"; (( i = i + 1 )) ; done (3.8) Associate the resource pool with the processor set: test# poolcfg -dc 'associate pool pool-test-z2 (pset pset-test-z2)' (3.9) Tell the zone to use the resource pool that has been created: test# zonecfg -z test-z1 set pool=pool-test-z2 (3.10) Boot the Oracle Solaris Container test# zoneadm -z test-z2 boot (3.11) Save the configuration to /etc/pooladm.conf test# pooladm -s (4.0) Results. Using the resource pools improves both throughput and response time: (5.0) References: System Administration Guide: Oracle Solaris Containers-Resource Management and Oracle Solaris Zones Capitalizing on large numbers of processors with WebSphere Portal on Solaris WebSphere Application Server and T5440 (Dileep Kumar's Weblog)  http://www.brendangregg.com/zones.html Reuters Market Data System, RMDS 6 Multiple Instances (Consolidated), Performance Test Results in Solaris, Containers/Zones Environment on Sun Blade X6270 by Amjad Khan, 2009.

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• Top 10 solution documents for Weblogic Server J2EE Feb 2014 - May 2014

  - by jhpierce -Oracle

  The following are the top 10 documents linked to SRs as solutions, for Weblogic Server J2EE issues, from Feb 2014 thru May 2014. 1163020.1 How to configure Filtering class loader in weblogic.xml   To configure the Filtering Class Loader to specify a certain package is loaded from an application, add a prefer-application-packages descriptor element. 1276593.1 WLS - How to supress servlet/JSP version details In WebLogic HTTP response header The string "X-Powered-By: Servlet/2.4 JSP/2.0" is showing up in the servlet response header.How to stop Weblogic from including servlet/JSP version details in the x-powered-by HTTP response header. 1490080.1 WebLogic Server 12.1.1.0 in a Cluster Environment Throws NotSerializableException for CDI Applications at com.sun.jersey.server.impl.cdi.CDIExtension When running in clustered environment, server start-up is not clean when you have CDI applications deployed. 1268138.1 Sample TwoWay SSL implementation for JAX-WS Webservice!   In this sample provided the recipient checks for the initiator's public certificate. Note that the client certificate can be used for authentication. 1584779.1 Socket Leaks When Calling Web-Service Over SSL This is a known bug 16810786 1598617.1 Secure WebService call throwing CANNOT RESOLVE URL FOR PROTOCOL HTTP/HTTPS through web server(APACHE) plug-in.    1056121.1 How to Timeout Weblogic Webservice Client   How to timeout a WebService client with and without using Stubs. 1568638.1 When packaging Jersey JAX-RS libraries into webapp throws NoSuchMethodError()  When attempting to include custom Jersey implementation libraries in to web application in a OSB domain. 1118264.1 WLS 10.3: Intermittent XA error: XAResource.XAER_RMERR In WebLogic 10.3, a CMP EJB sometimes throws the exception.   1608951.1 How to get More Details About Error BEA-101215 Malformed Request. Request parsing failed Code: -1   Which was seen when accessing the application via loadbalancer?

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• Best Persistence choice for J2EE-App with frequently changing Data Model

  - by Ben-G

  Whenever I develop a J2EE-Application, I at some point decide to switch from my dummy Persistence (Simply Using Lists and other Data Structures) to some Sort of Database Persistence. Mostly when I hope the Data Model is more or less complete. From this point on, changes to the data model become exhausting, but unluckily they occur rather often. I've used different Object-Relational-Mappers (iBatis, Hibernate) for my projects. They definitely reduce the pain coming with Data Model changes, but they anyway let me adjust code/configuration at 3 or 4 places for every single change. To me, that's cumbersome and error prone. I made a better experience with DB4O, which simply persists Java Objects as they are, but I believe it's performance does not scale for huge applications. Is there anyway to maintain performance while letting out all the ugly configuration work? I'm seeking a performant framework which really hides persistence from my code. Wish for thinking? Or am I missing out THE technology? Hope you can help.

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• J2EE or .Net Framework [closed]

  - by Kevino

  I want to learn JAVA or C#... tell me the strength and weakness of each platforms J2EE and .Net Framework today in 2012 and which is safer for the future jobs wise? I tend to prefer Java because here (Montreal, Toronto) there is like 6 Java jobs for each C# jobs and some experienced programmers advised me to go with Java because they say JVM languages are winning in the cloud and the rise of Android can't do anything except help Java in the long run. Is that true today with the release of windows 8 soon and ios devices? On the other side 1 of these programmers told me that corporation love Asp.Net Mvc3 for intranet and web dev and that tomcat/apache java jsp adoption is slowing down compared to Asp.net and ruby on rails & html5 etc. He told me too since I have a good background in system admins & networking C# would be better for me because I'll be able to do more things in the microsoft world with powershell automation and creating my own apps for all the networking stuffs (windows server, dns,dhcp, active directory, sharepoint etc). But what if windows 8 flop java and android aren't safer in the long run? because he told me mono was a joke compared to Java/android or native objective-c on ios devices. (I plan to do a full time study of 10hr's / 15hr's a day for the next 9 months of either Java or C# that's why I ask this)

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