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  • Java EE Summit December 3rd-5th Cologne, Germany

    - by JuergenKress
    16 Java EE Workshops in 3 days: Track: Java EE Core Technologies · Core – JPA 2.x - Arne Limburg · Core – EJB 3.1 und 3.2 - Jens Schumann · Core – CDI 1.0 & 1.1 - Mark Struberg · Core – JSF 2.x - Lars Röwekamp Track: Best Practices · Pitfalls in Java EE - Mark Struberg · Java EE UI - Adam Bien · Modeling meets Code - Arne Limburg · Java EE Security - Adam Bien Track: Java EE Kickstart · Kickstart – Java-EE-Architekturen - Jens Schumann · Kickstart – Java Web Profile - Lars Röwekamp · Kickstart – Events und Messaging - Thilo Frotscher · Kickstart – Services: REST und WS-* Thilo Frotscher “Do it yourself” – Workshop Day · Java EE Core – Putting together - Jens Schumann, Lars Röwekamp · Java EE Core – Putting together: Extended Edition · Java EE 6/7 – Productivity with Joy: Development - Adam Bien · Java EE 6/7 – Productivity with Joy: Testing - Adam Bien >> Night Session mit Matthias Weßendorf: · Future: New School Web Apps For more information and registration please visit www.java-ee-summit.de/zeitplaner. WebLogic Partner Community For regular information become a member in the WebLogic Partner Community please visit: http://www.oracle.com/partners/goto/wls-emea ( OPN account required). If you need support with your account please contact the Oracle Partner Business Center. BlogTwitterLinkedInMixForumWiki Technorati Tags: Java EE,Adam Bien,Java EE Summit,WebLogic Community,Oracle,OPN,Jürgen Kress

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  • OpenVPN vs. IPSec - Pros and Cons, what to use?

    - by jens
    interestingly I have not found any good searchresults when searching for "OpenVPN vs IPSec": I need to setup a private LAN over an untrusted network. And as far as I know, both approaces seem to be valid. But I do not know which one is better. I would be very thankfull If you can list the pro's and con's of both approaches and maybe your suggestions and experiences what to use. Update (Regarding the comment/question): In my concrete case the goal is to have any number of Servers (with static IPs) be connected transparently with each other. But a small portion of "dynamic clients like road warriors" (with dynamic IPs) should also be able to connect. The main goal is however having a "transparent secure network" run top of untrusted network. I am quite a newbie so I do not know how to correctly interprete "1:1 Point to Point Connections" = The solution should support Broadcasts and all that stuff so it is a fully functional network... Thank you very much!! Jens

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  • Mac Mini won't boot with USB Drive connected

    - by Jens
    Newbie here. I have a 2012 MacMini with 2 x 3Tb Seagate GoFlex Desk external hard drives. Both drives have their own power supplies and work perfectly. I use both MacOS and Windows7 on the Mac for different reasons. Both boot and work fine. The only problem is neither MacOS or Windows will boot while the two USB drives are connected. I must disconnect the USB cables, boot and reconnect them. Then all works fine. Its rather annoying since this is mostly a Media Centre and you really don't want to be playing with cables every day, and I don't leave my stuff on over night. Can anyone help? Thanks Jens

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  • List of MD /Raid/LVM (Devices) = How to mount them without any further information available?

    - by Jens
    Hello Expets, I do not have much skills in linux and installed a system two years ago that I now had to reboot, but it seems I did not automate everything with start-scripts... My Problem: I miss some mountpoints. I have a list of my raids (excerpt:) md3 : active (auto-read-only) raid1 sda6[0] sdb6[1] 97659008 blocks [2/2] [UU] md4 : active (auto-read-only) raid1 sda7[0] sdb7[1] 250099776 blocks [2/2] [UU] and it seems md3 and md4 are NOT mounted. However i do NOT have any entries for them fstab file. What should I do next. I do NOT know which filesystem they have (most likely ext3). =Can I savely try to mount them with (mount -t ext3 /dev/md3 /mnt/mymntpoint) or will the lead to corrupted data, in case they are not ext3? What should I do next (based on the information given above). The goal is to remount these Devices again, but I do not know anything about them anymore... Thank you very much Jens

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  • (Open Source) Cloud-Filesystem to run a Database on Top?

    - by jens
    Hello, what are current "technologies and implementations" to get a filesystem with unlimited capacity by using single servers with their harddisk to form a "grid/cloud filesystem"? I need to have unlimited space (by adding further servers) but it must be a filesysem that is capable of running a database on top. I know of Apache Hadoop but that seems not be be Ideal for running a DB on top of it (or am I wrong??) And iSCSI seems to be "remote/networked" but I do not know how and if this is clusterable? thank you very much!! jens

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  • (Open Source) Cloud-Filesystem to run a Database on Top?

    - by jens
    Hello, what are current "technologies and implementations" to get a filesystem with unlimited capacity by using single servers with their harddisk to form a "grid/cloud filesystem"? I need to have unlimited space (by adding further servers) but it must be a filesysem that is capable of running a database on top. I know of Apache Hadoop but that seems not be be Ideal for running a DB on top of it (or am I wrong??) And iSCSI seems to be "remote/networked" but I do not know how and if this is clusterable? thank you very much!! jens

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  • HTML: <textarea>-Tag: How to correctly escape HTML and JavaScript content displayed in there?

    - by jens
    Hello, I have a HTML Tag <textarea>$FOO</textarea> and the $FOO Variable will be filled with arbitrary HTML and JavaScript Content, to be displayed and edited within the textarea. What kind of "escaping" do I neet to apply to $FOO? I first tought of escaping it HTML but this didnt work (as I will then get shown not the original HTML Code of $FOO but rather the escaped content. This is of course not what I want: I want to be displayed the unescaped HTML/JS Content of the variable... Is it impossible to display HTML Content within a <textarea> tag and also allow it to be editable as full HTML? thanks jens

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  • Java JMS = HornetQ = javax.jms.JMSSecurityException: Unable to validate user: null ?

    - by jens
    Hello Experts, I am trying for several hours to get the HornetQ Examples running in Eclipse. Using the Standalone Examples everything works fine, but when I run the examples in Eclipse I get the following error: javax.jms.JMSSecurityException: Unable to validate user: null What could this error mean? Where do I have to specify the user? Maybe HornetQ tries to look this user up in "Some Context/Properties" etc , but I do not know where and how to specifiy the user HornetQ is running under. What i did: 1.)Started Default HornetQ Server with the start.sh Script in the ./bin directory 2.)Copied the QueueExample over to eclpise 3.)Did some minor changes in the config files (to have the same Queue Names...) (I also tried to disable security completely by setting: <security-enabled>false</security-enabled> but with no success, always getting the same error. Also when trying to programmatically instance HornetQ only via classes I get this error too). Thank you very much!! Jens

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  • Asynchronous Processing = Spanning Threads = Valid?

    - by jens
    Hello Experts, am I allowed (without any sideeffects) to create and start a new Thread() from within a doGet() Method of a servlet? Or does this somehow leak ressources? Is it valid to also pass the "Session" Object into the Thread to later save the result of my asynchronous processing (I will synchronized correctly) in the session? Or will this leak ressources when using the session "in indepedant threads"? = What would happen if the session meanwhile would be expired by the webcontainer as it has timedout and I will access it from my thread? Or would could this also lead to the sideffect, that storing the session in the thread will prevent the webcontainer from expiring the session at all (and therefore finally leak ressources as the sessions do not get cleared up)? (I know there are other Solutions, like working with DB-(Job)Records, JMS or Servlets 3.0) but I need so solve the problem as described by spanning a new Thread within doGet.) Thank you very much!! Jens

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  • JQuery: NOT using document.ready and inserting HTML Tags = is this allowed?

    - by jens
    Hello, is this a valid JQuery usage pattern to : <script type="text/javascript"> $("body").prepend('<input type="hidden" id="error" value="show">'); </script> That is using Jquery to manipulate / insert HTML Tags when the Document has NOT YET been loaded (by not using document.ready for the inserting into the DOM)? (Normally I only use document.ready, but in this case I need to insert some Information into the DOM that then is present, when document.ready is called. This is some kind of "happens-before" relations ship I want to achieve so that I am shure when document.ready is called the inserted Form field is available in the document, as I depend on that information. Thank you very much jens

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  • Java Compiler: Optimization of "cascaded" ifs and best practices?

    - by jens
    Hello, does the Java Compiler optimize a statement like this if (a == true) { if (b == true) { if (c == true) { if(d == true) { //code to process stands here } } } } to if (a == true && b==true && c==true && d == true) So thats my first question: Do both take exactly the same "CPU Cycles" or is the first variant "slowlier". My Second questin is, is the first variant with the cascaded if considered bad programming style as it is so verbose? (I like the first variant as I can better logically group my expressions and better comment them (my if statements are more complex than in the example), but maybe thats bad proramming style?) and even slowlier, thats why I am asking... Thanks Jens

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  • Server crash = How does a TCP/IP (and the browser-client) behave after this?

    - by jens
    Hello Experts, i would be thankfull for an explanation what happens with HTTP(TCP/IP) transmissions when the server crashes unexpectedly, how does the client Browser (Firefox / IE) handle this event. What happens in the following two standard cases: Clients-actively sends data: The TCP/IP Connection has been estableshed and the Client (Web-Browser) is Sending a POST Request with some data and in the middle of the process of sending the server crashes. What does this mean for the client? As far as I know TCP/IP does not "acknowledge" a send data-package so the client does not know that the server crashed. How will the client behave? (Firefox and Internet Explorer)? The Server is actively sending data: As above the tcp/ip connection has been established and the Server is sending a large website to the client (browser). In the middle of the sending-process the server crashes, so no futher packets are sent. How does the client browser react to this event (Firefox and Interne Expolrer) Thank you very much!! Jens

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  • Hibernate: Dirty Checking and Only Update of Dirty Attributes?

    - by jens
    Hello Experts, in "good old JDBC days" I wrote a lot of SQL Queries that did very targeted updates of only the "attributes/members" that were actually changed: For Example having an object with the following members: public String name; public String address; public Date date; If only date was changed in some Business Method I would only issue an SQL UPDATE for the date member. ==It seems however (thats my "impression" of hibernate) that when working with a standard Hibernate mapping (mapping the full class), even updates of only one single member lead to a full update of the object in SQL Statements generated by Hibernate. My Questions are: 1.) Is this observation correct, that hibernate DOES NOT intelligently check (in a fully mapped class), what member(s) where changed and then only issue updates for the specific changed members, but rather always will update (in the generated SQL Update Statement) all mapped members (of a class), even if they were not changed (in case the object is dirty due to one member being dirty...) 2.) What can I do to make Hibernate only update those members, that have been changed? I am searching for a solution to have hibernate only update the member that actually changed. (I know hibernate does some big work on doing dirty-checking, but as far as I know this dirtychecking is only relevant to identify if the object as whole is dirty, not what single member is dirty.) Thank you very much! Jens

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  • Java Concurrency : Synchronized(this) => and this.wait() and this.notify()

    - by jens
    Hello Experts, I would appreciate your help in understand a "Concurrency Example" from: http://forums.sun.com/thread.jspa?threadID=735386 Qute Start: public synchronized void enqueue(T obj) { // do addition to internal list and then... this.notify(); } public synchronized T dequeue() { while (this.size()==0) { this.wait(); } return // something from the queue } Quote End: My Question is: Why is this code valid? = When I synchronize a method like "public synchronized" = then I synchronize on the "Instance of the Object == this". However in the example above: Calling "dequeue" I will get the "lock/monitor" on this Now I am in the dequeue method. As the list is zero, the calling thread will be "waited" From my understanding I have now a deadlock situation, as I will have no chance of ever enquing an object (from an nother thread), as the "dequeue" method is not yet finised and the dequeue "method" holds the lock on this: So I will never ever get the possibility to call "enequeue" as I will not get the "this" lock. Backround: I have exactly the same problem: I have some kind of connection pool (List of Connections) and need to block if all connections are checked. What is the correct way to synchronize the List to block, if size exceeds a limit or is zero? Thank you very much Jens

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  • Java Instance of: Supertypes und Subtypes seem to be equal? How to test exaclty for Type?

    - by jens
    Hello, i would be thankful for your advice. I need to test, if an instance is exactly of a given type. But it seems that instanceof returns true also if the subtype is tested for the supertype (case 3). I never knew this before and I am quite surprised. Am I doing something wrong here? How do I exactly test for a given typen? //.. class DataSourceEmailAttachment extends EmailAttachment //... EmailAttachment emailAttachment = new EmailAttachment(); DataSourceEmailAttachment emailAttachmentDS = new DataSourceEmailAttachment(); if (emailAttachment instanceof EmailAttachment){ System.out.println(" 1"); } if (emailAttachment instanceof DataSourceEmailAttachment){ System.out.println(" 2"); } if (emailAttachmentDS instanceof EmailAttachment){ System.out.println(" 3 "); } if (emailAttachmentDS instanceof DataSourceEmailAttachment){ System.out.println(" 4"); } RESULT: 1 3 4 I want to avoid case 3, I only want "exact matches" (case 1 and 4) how to thest for them?? thanks!!! Jens

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  • Best PHP-based web development 'stack' of 2011

    - by Jens Roland
    I have been building PHP-based web sites for many years, and lately it seems I'm discovering another interesting new tool or method once every few weeks. This begs the question - what is the current state of the art in PHP development stacks for the seasoned coder? I'm specifically interested in the following: High-performance web server Database MVC framework Build tool Revision control Continuous Integration Automated testing Non-persistent caching I'd like to optimize my stack for scalability and rapid development. I'm not looking for personal preference here, I'm looking for real, quantifiable reasons to pick this-over-that.

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  • SEO - Google and link cleaning / cloaking [closed]

    - by Jens Törnell
    Possible Duplicate: Does the Google spider render JavaScript? This a SEO related question, not a code related one. Googles own link cleaning / cloaking Gå to http://www.google.com and search for something. Hover the title and you will se a link to the page you want to go to. The URL you see when hovering is NOT the link you are clicking on. Instead of clicking you can drag the title a little bit and then hover it. Then you will se the real URL. My own link cleaning / cloaking Go to http://jsfiddle.net/NvmER/1/ and click the link, or look at the code below. You will be "redirected" to http://www.test.com. The real link are http://www.test.com/?event=23 Working code in case jsfiddle don't work If you need to se how it works I pasted a code below. <a class="direct" href="http://www.test.com/?event=23" data-redirect="http://www.test.com">Länk</a>? $(document).ready(function() { $("a.direct").live("mousedown", function(e){ var oldurl = $(this).attr('href'); var newurl = $(this).attr('data-redirect'); $(this).attr('href', newurl); }); });? Question Is this ok with Google? It's done with javascript. If you have an answer, link to a source or test to support it.

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  • How to learn & introduce scrum in small startup?

    - by Jens Bannmann
    In a few months, a friend will establish his startup software company, and I will be the software architect with one additional developer. Though we have no real day-to-day experience with agile methods, I have read much "overview" type of material on them, and I firmly believe they are a good - if not the only - way to build software. So with this company, I want to go for iterative, agile development from day 1, preferably something light-weight. I was thinking of Scrum, but the question is: what is the best way for me and my colleagues to learn about it, to introduce it (which techniques when etc) and to evaluate whether we should keep it? Background which might be relevant: we're all experienced developers around the same age with similar professional mindset. We have worked together in the past and afterwards at several different companies, mostly with a Java/.NET focus. Some are a bit familiar with general ideas from the agile movement. In this startup, I have great power over tools, methods and process. The startup's product will be developed from scratch and could be classified as middleware. We have some "customer" contacts in the industry who could provide input as soon as we get to an alpha stage.

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  • Google Analytics API - Super simple?

    - by Jens Törnell
    Google Analytics API - Too complicated? I've read about Google Analytics API but heard of others that it is a bit complicated to make it work. I use PHP. Copy / paste example My question is if there is a copy / paste example anywhere on the web for getting a stats curve of the latest month, or just the numbers for that period? Important I need to use the new Google Analytics API version for 2012. The other one is going to die soon.

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  • Self hosted Netvibes alternative [on hold]

    - by Jens
    I am looking for a self-hosted alternative to part of the Netvibes functionality. It should act as feed reader, show my mail inbox, a list of bookmarks and maybe the weather forecast. I wish to move away from Netvibes since I don't care to share my browsing habit, and certainly not my mail password, with another person or company. I am certainly willing to invest some time in setup, maybe up to writing a plugin for a solution that does not fulfill all my requirements. Dou you have suggestions on where to look?

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  • The understanding of flight search engine

    - by Jens Jensen
    Today I just discovered a search engine website who offered a service to enter your departure destination, and then search for which possible destinations you can have for the cheapest price. This is very nice to use, if one wants to flight somewhere but doesn't know which "good deals" are available. This is the site: http://www.kayak.com/explore/ Can someone explain to me, which programs are (mostly) used, and summarize how to make this sort of search engine. I think this is very interesting but unfortunately there are not shown all the possible flight tickets and therefore I think this project could be improved.

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  • GEO Tool - commercial use

    - by Jens
    what i want to do: offer my clients the possibility to display their store as a small graphic (like google maps). just a small png with the location of the store. only the specific client is able to see this images and he pays for this area (not only for that :) ). So i'm looking for a api or whatever else to geocode(?) the adress and render a small (280*160px) image. google offers a premium licence (not cheap) ms bing openstreetmap - i'm not able to understand the 10^10 licences ;( any ideas?

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  • Is there a maximum delay an UDP packet can have?

    - by Jens Nolte
    I am currently implementing a real-time network protocol for a multiplayer game using UDP. I am not having any technical difficulties, but as I always have to care about late UDP packets I am wondering just how late they can arrive. I have researched the topic and have not found any mention of it, so I assume there is no technical limitation, but I wonder if common network/internet architecture (or hardware) gives an effective limitation of how late a UDP packet can be delivered.

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