Java card confusing questions! Java Card architecture, advantage!

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• Confusion/Questions about Java

  Running Windows XP Pro, SP2

  I just downloaded and installed the latest version of Java (update version 6, 15).

  1. when I look under Program Files / Java, I found 3 files:

  JRE 1.5.0 dated 09/11/2005

  JRE 1.6.0_0, dated 2007-06-21

  JRE 6, date dated 02/09/2009 (obviously the last download)

  2. when I look under control panel JAVA, under the 'Java' tab, view and manage versions of the Java runtime and the settings for Java applications and applets, I find the 3 versions (above) listed and enabled.

  3. when I look under the Control Panel / Add/Remove Programs, I find 2 entries for Java:

  (TM) 6 Update 15 (of course the update was installed just)

  Java (TM) SE Runtime Environment 6 Update 1

  My questions are:

  1 are all these versions/files necessary?

  2. shouldn't the last update replace the previous versions?

  3. What can I delete (i.e., what is not necessary), and how can I remove them?  It seems to me that lists of Java in Add/Remove programs are for the most recent version, which probably I shouldn't remove. I have to change the registry to successfully delete older versions?

  4. should I just turn off the 2 older versions in the Java Control Panel and you don't have to remove them (although I prefer to free up additional disk space if they are not required)?

  I could use some advice warned of your people.

  Thank you.

  First of all, I want to inform that you uninstall Java and manually remove the Java files once you did if they still exist.

  In the same sense, re - install Java (latest Version) and make sure that it works. Use the tester of Java on the Java site to do this. (Google "Java tester").

  Then try to fill one of the actions that you were trying to front.

  If it's still a question please let me know and we can discuss some of the resolutions more advanced with the registry changes.

• A 4 GB GPU card offers advantages over a 2 GB with first version?

  Is there an advantage to using a GPU card with more than the typical 2 GB memory on board during the first use and after effects CC?

  Yes, if the resolution is more than 2 K then fine DISPLACEMENT 3 + GB of ram on the card. Some Applications with GPU acceleration suggest 4 GB of ram or more for the GPU with 4K. The effects of acceleration will be a greater use of the ram with higher resolution frames, this is also a reason.

  Eric

  ADK

• confusing question of javac

  Hi all
  
  I have 2 files: A.java and B.java in test/foo/xcom with content as follows:
  A.Java:
  Xcom package;
  public class A {}
  
  B.Java
  Xcom package;
  public class B extends a {}
  
  Now, I use javac to compile.
  * 1st test: set a directory current for "xcom" then invoke:
  javac A.java-> build successfully created named. Class
  javac B.java-> error (cannot find symbol: class A)
  
  * 2nd trial: current to 'test' and then call directory
  javac - cp. Xcom / B.java-> build successfully created B.class
  
  My question is: Why can't build B.java but it is managed with A.java 1st try? (I use java 6)
  Thanks in advance.

  user1090710 wrote:
  Hi all

  I have 2 files: A.java and B.java in test/foo/xcom with content as follows:
  A.Java:
  Xcom package;
  public class A {}

  B.Java
  Xcom package;
  public class B extends a {}

  Now, I use javac to compile.
  * 1st test: set a directory current for "xcom" then invoke:
  javac A.java--> created successfully, named build. Class
  javac B.java--> error (cannot find symbol: class A)

  To compile the class A, you don't need class b, so it compiles properly.
  There need to compile class B, class A, and he doesn't know where to find it.
  Since you have not specified any classpath. (current directory) is assumed.
  He tries to find test/xcom/./xcom/A.class (if already compiled) or test/xcom/./xcom/A.java (to compile with B.java), but he finds none.

  Therefore, simply specify the good "-cp.." and it will work.

  Published by: baftos on March 20, 2011 11:10

• Question of design architecture: layers of components

  I am so confused about how combine components and when I should inherit, and when things go into skins. I have a custom component tile that looks like this:

  

  Source (Simplified) looks like this:

  "< s:SkinnableContainer skinClass = 'skins. TileSkin""">

  < fx:Script >

            <! [CDATA]

  [Bindable] public var tileColor:uint = 0xFF0000;       / / Color of base tile.  The central area will be this color.

  [Bindable] public var tileThickness:uint = 4;            / / How high the tile seems to have his Center Party raised.

            ]] >

  < / fx:Script >

  < / s:SkinnableContainer >

  All drawing is found in the skin.  I have a subclass this component to have a LabeledTile:

  

  Source (Simplified) looks like this:

  < components: tile >

  < fx:Script >

            <! [CDATA]

  protected static const int PADDING = 3;

  public function get text1 (): String { return Label1.text ;}

  public function set text1 (str:String):void {Label1.text = str ;}

            ]] >

  < / fx:Script >

  " < s:Label id ="Label1"x =" tileThickness{}"y =" tileThickness{}"

  {" height =" {}height - 2 * tileThickness}"width =" {} {width - 2 * tileThickness}"

  "" " maxDisplayedLines ="1"textAlign ="center"verticalAlign ="middle"

  {' {' paddingLeft = "{}PADDING}" paddingTop ="{} {}PADDING" paddingRight = "{}PADDING}" paddingBottom ="{} {PADDING}"/ >

  < / components: tile >

  I want to have a subclass of LabeledTile called LabeledTileWithGizmo that looks like this:

  

  I thought this might work:

  < components: "" LabeledTile width ="130" height ="32" tileColor = "0x0077EE"

  contentCreationComplete = "ContentCreated ()"> "

  < fx:Script >

            <! [CDATA]

  private function ContentCreated():void

                 {

  Label1.setStyle ( "fontSize", 14);

  Label1.setStyle ( "color", 0xFFFFFF);

  Label1.setStyle ( 'fontFamily', '"Trebuchet MS" BOLD, Arial, Helvetica, _without' );

                 }

            ]] >

  < / fx:Script >

  "" < components: Gizmo x = "100" y ="4" height = "24"/ > "

  < / components:LabeledTile>

  The gizmo appears on the tile, but the label disappears.  If I put the component Gizmo just next to the Label in the LabeldedTile element, they both get drawn.  But I want to have labeled the tiles that have no gadgets, as well as those who do.  I also have different types of gadgets.

  So, should I make a subclass of tiles with optional subcomponents?  And how could I do?

  Should I put more than this in TileSkin?  And the other components are States in the skin?

  I should have a different skin for each tile, LabeledTile and LabeledTileWithGizmo?  The second skin must inherit from the first skin and the third to the second?

  Can I get a skin for a component to set styles on a subcomponent (for example to have a LabeledTile set the fontSize, etc on the subcomponent Label)?  Or is it still possible.

  I am so confused on how all these elements must adjust.  Any idea would be appreciated.

  Your MXML for LabeledTile has Label1 as a child element in MXML.  When you subclass that class using MXML)

  Looks like what you want to do is subclass of SkinnableContainer to have a label, part of the skin and move your label in the skin.  In this way, when you add child elements to your container it won't replace the label with your child items.

  This article is a good start to learn more about the counting of spark: http://www.adobe.com/devnet/flex/articles/flex4_skinning.html

  If you follow the process above, so here are some answers to your specific questions:

  So, should I make a subclass of tiles with optional subcomponents?  And how could I do?

  > You could label an optional part of the skin, so if someone does not want the label will then appear, they would create a custom look that does not include it.  An alternative approach is to expose a property on your component showLabel who would control the visibility of the part of the Label.

  Should I put more than this in TileSkin?  And the other components are States in the skin?

  > Yes move the label on the skin.  You could use States or expose a showLabel property as I mentioned above.

  I should have a different skin for each tile, LabeledTile and LabeledTileWithGizmo?  The second skin must inherit from the first skin and the third to the second?

  > Looks like you could do all this with a single component and a skin by adding another part of skin customized for the gizmo. Legacy via MXML skins is not trivial to implement.

  Can I get a skin for a component to set styles on a subcomponent (for example to have a LabeledTile set the fontSize, etc on the subcomponent Label)?  Or is it still possible.

  > Yes, you should be able to do this, simply call setStyle on the part of the skin

• A few Questions about the Architecture of OBIEE

  It's just a continuation of this thread:
  
  Confused about BI Publisher and BI Presentation Services
  
  I just know how the whole process works, RPD, OPE, NSQconfig...
  
  
  So next step 1 =)
  
  As I understand it, is now, I need to go to the Administration tool, first create a repository? Then go to BI Presentation Services to create reports (with answers)? What is the creation of the user comes up? What is the purpose of BI Publisher? I already install a few things about BI Publisher as a user, roles, etc., but still not of creating a report. Sorry if I ask too many questions, I'm just trying to understand what each tool link. I checked the docs, and especially they are diving just by changing configs without really explaining why. (àle moins c'est comment je l'ai vu) =)
  
  Thanks a lot again!

  Wow - where do we start!

  Remember that they are two distinct products, OBIEE and its configs related / components (RPD, Server BI, BI presentation services - ibots answers, dashboards, etc.)
  BI Publisher, formerley XML Publisher, successor to Oracle reports.

  They fall under the Oracle's BI stack.

  Lots of information on our site, the link in the previous post you mentioned.

  'Roles' in OBIEE able to determine - authorization is to say what you can do in the sytem or the 'Privileges '. What objects (reports / dashboards) you can use and can also be used for data security filters (virtual "private data" version as an Oracle DB real option "VPD" OBIEE)
  Roles in BI Publisher can generally mean the same thing, which can create folders, which can create reports, which can run, which can create sources of data etc. Sometimes, you need to use a specific role of the system name, sometimes you can create your own names and refer to them as you please (BEEP roles are generally a predefined set, OBIEE roles can be called as you like)

  Sounds hard at the beginning and without prior experience but seriously, there are some blogs very very well on here, such as mentioned in the previous answer, we have too much info on our website (Peakindicators.com)
  Feel free to send me an email.

• What are the advantages and disadvantages of using iCloud drive (or other Cloud services) compared with iTunes game against external hard drive, Solid State etc. to store my songs iTunes, playlists, ratings etc?

  First question: what are the advantages and disadvantages of using iCloud drive (or other Cloud services) compared with iTunes Match against Solid State external hard drive etc to store my songs iTunes, playlists, ratings etc?

  Please let me know what are the alternatives for storage of my songs, playlists, song etc. other than iTunes game ratings ($ 24.99 / year)?  Is there a way to store all my songs with my song ratings, playlists, etc. with a CD song quality? Most of my (currently 130 GB) songs on my computer are CD quality that I prefer to keep as well as my notes of each song (i.e. 5 * vs. 4 * etc.), playlists, groups (music, classical, popular, country etc.).  What are the advantages and disadvantages to store my iTunes songs while CD quality with my personal notes, reading lists, groupings in the cloud?  ICloud of Apple Drive ($ 2.99 per month or $36 / year for 200 GB) would be the best way to automatically update and maintain my rankings iTunes personal including the future editions of the song etc or using Amazon, IBM, Microsoft etc cloud or an external hard drive SSD would work as well and maybe cheaper?  I currently have my iTunes on a PC of 2007 with vista (I use a 1 8T Western Digital external upward by car for my personal info all over HP, songs, photos etc. which is currently close to 170 GB) but also have an Apple i-phone 6 & I Air cushion.  Although I did not need to have all of my music with all their sides, etc. available on all of my devices at all times as iTunes game, I still would have easy access to information on both my PC and my iPhone or iPad?  Thank you.

  In my opinion?

  I back up my data to an external drive for several reasons.  The first is my data - if I put on the cloud, someone else has control over it, they can see what I have and change the preferences to what they see of marketing.

  Almost as important as that - if I had to rely on the cloud whenever I wanted to update my playlists on my phone, I need a better internet connection I have now (working at sea).  To get the best out of the cloud, you need a solid link to home, work or mobile.

  As a spin-off - I hate the fact that Apple take away a feature in their software updates and then allow an app to be sold in their store to replace this feature - or worse still, some features that were available before the updates are now "cloud only."  And Yes - you have to pay for the cloud.  I like most of the people do not appreciate the 'accomplished fact. "

  From the back of the external hard drive ASI downside, is that to be safe, you need to store outside in a separate computer place.  If keep you them together, if one is lost, probably, they are both.  That is to say for me a full backup before you travel, then a new upward as soon as I go home.  Downside is how much data may be lost between the two back ups if I needed to restore.  For me, its worth the risk.  If I was away and say had bought a ton of new music and couldn't go home anytime soon, I can always head to the store and buy a new external drive, they are massively expensive.  Even if my computer has to go for repair and my remote is to halfway around the world - I want to buy a new one.

  Now, some will say that once you buy a new external, you spend more than you would on a cloud subscription.  It's true, but in the 6 years following the purchase of Mac that I've only had to buy a new external once - so with a little luck and planning - it works.

  I left took well - I am not a subscriber of cloud, nor do I want to be.

• What architecture for my application?

  Hello!

  For my test bench, I developed the LabVIEW software. In the last months, I asked several questions in this forum, but always about the details of my application. Until now, I never really questioned the general architecture (which is certainly a mistake, that I want to learn).

  What drives this desire to review my work, it's that I am currently not able to interrupt the complete progam or subfeatures of controlled prematurely or if errors occur.

  I hope you could give me some suggestions which would fit my application better. I'm not really experienced in structured programming, use for example architectures producer/consumer etc and I'll read up on them, but first I need a general boost in the right direction.

  First a brief overview of my hard - and software:

  HW:

  • 3 different controllers control of actuators
  • 2 different cameras

  SW:

  • Front for the interaction with the user
  • Several measurement routines that use different combinations of actuators and cameras. For example "move to position 1 and take a picture, then move on to position 2, etc.. These routines can be quite long, including the analysis of the images and decisions based on the results. These routines must sit in event of an event structure that in turn lies in my main program (the program of the façade).
  • Void / screw (lowest level in my software) who send the actual orders for controllers, for example 'move', 'read the current position' etc. These Sub VIs are separated from my Panel VI and consist of structures events themselves, an event for every basic function. These event structures are controlled from the front panel via the dynamic user events. So basically a push of button on the remote.

  Finally a very brief example of workflow in my software:

  1. Façade is started. Along the SubVIs for controllers are also started
  2. Lance user measure routine N1 with a button
  3. Start of the event in the front panel. In this case, other events are generated sequentally, according to the algorithm of measure.
  4. These remote events live Sub point 1, for example remote press the buttons for the basic functions in the desired order (move, take photo etc.).

  Problem is that the user cannot terminate measurement routines before they are completed, because the program is locked up in the case of corresponding event.

  In addition, when a controller reports an error (e.g., loss of power), as routine orders keep coming which results in more errors.

  This should be possible with my new architecture:

  • The user in the front panel (as before)
  • Premature termination of all auxiliary program if the user wants or if the error occurs. Then a defined State must be entered (including closure of all references, power off all devices, etc.)

  I'm not at work right now, but I'll upload some screenshots later because let's face it – which was a wall of text

  But maybe it's enough for a few first thoughts of you?

  Thank you!

  I tend to like to have HAL - so I tend to create a module that is designed just to communicate with the instrument and then my main loop of the program (e.g. routine measurement / logic program) interact with that and sends updates to the user interface. This is because if I want to use this material in another application, I can re - use the 'module '. It's perfectly OK to have your material combined with your message loop - loop, but if it takes a long time to read the data of the instrument, your application would be not as sensitive to the façade events (because it must wait to finish first).

  So, you could have:
  -UI event loop
  -The main Message loop (responds to user interface events and your program 'flow')
  -Hardware Loop (to initialize and communicate with the instrument)

• Any advantage to transcode AVCHD P2?

  I'm editing Panasonic AVCHD images from a camcorder in PP CS6 AC130. PP seem to handle AVCHD without any problems, other than a bug in a hover scouring. However, I have Panasonic utility for converting AVCHD P2 footage. It is a relic of a time when NLE couldn't import AVCHD video directly.

  Here's my question: is there an advantage to transcode AVCHD P2 before opening the images in PP? Panasonic indicates that the converter is lossless, so I think that there might be some advantage to decompress before boarding in PP. The most obvious conversion would cost larger file on my hard drive. Are there benefits which would offset this cost? Thank you.

  Unless you encounter the problems described in

  this document about the known bug of AVCHD in CS6

  I would not transcode anything... just edit in native mode.

  Panasonic indicates that the converter is lossless,

  so I think there might be some advantages

  Uncompressing before loading in PP.

  Which would be better described as relative to thecompression.

  If you are prone to transcode your media before installation.

  I would recommend using one of these codecs instead:

  http://forums.Adobe.com/message/5368571#5368571

• best practices for the structure of the code control multiple devices in a sequence-step 2

  I have a question about code architecture and to get multiple devices controlled and synchronized for an experience. It is an 'architecture' - type application, so I hope for some suggestions on how to proceed.

  I run an experience in which I order 2 NI PCI-6733. I will soon add a Tektronix AFG 3022 B and have long been turned off the opportunity to rewrite my code labview from the ground upward. I inherited from a previous search, and although functional, I want to make it easier to modify and divide into sub - VI and these. Link to the current program (labview 8.6.1) is here if you do not want to see the code that is currently used and Subvi is in a zip file. The current version of experience consists of one stage, all writing the data for PCI cards is saved for the end. I need to change that in my configuration again well.

  The new experience consists of 2 steps. The first will take place (loop an array of output for PCI cards) until he heard a 'real' another computer (connected via TCP). When you do that, it should go to step 2 and run a sequence (usually 10 ^ 5 timeunits of length, where the unit of time is 0.1 ms) which refers to two PCI, the AFG 3022 B cards and with the flexibility to add more devices in the future.

  The most popular would be structural advice. How to organize the screw, if it's good to use a VI 'master' that would control the two sub - VI phase 1 and 2, etc...  Feel free to ask for more details if it helps clarify my question. Thank you!

  Such programs typically use a kind of State machine.  You will find many tutorials on LabVIEW state machines in these forums or forums of LAVA.  If you do a rewrite, I also recommend that consider you the LabVIEW classes.  They help modularize your code and do more reusable subparts.  You can end up with less to maintain, accordingly.

  You can also consider TestStand.  It was designed to perform sequences of tests, so can make your life easier.  It would be also exaggerated gross.

  Let us know if you encounter any problems with the machinery of State or classes.

• memory of reserved equipment occupies high memory

  Hi all

  It's saravnan high school.

  I am using windows 7 Home premium.

  RAM memory: 8 GB

  Reserved memory is about 7 GB OS and h/w.

  total space: 8192 MB

  reserved hardware memory: 5427

  in use memory: 1849

  stand-by: 864

  changed: 43

  free: 9

  Please tell me how to shrink the h/w placeholder.

  explain why the os memory occupies 1849 MB but win7 recommended memory is 1 GB.

  Looking forward to hear from you.

  Thank you

  but my question is...

  I use win 7 Home premium 32 bit OS... while checking the status of resourse monitor ram...  It shows as 8192 MB total ram memory, but the memory is 1345 MB only...

  Another ram memory is used by some other process such as mem H/s reserved

  I can't attach the screenshot here...

  screenshot will explain my problem
  -------------------------------------------------------

  my knees resource monitor displays as

  Total ram memory: 8192 MB
  ==================================
  USE OF RAM MEMORY BELOW
  =================================
  reserved material mb memory: 5427
  in memory use: 1372 MB
  stand-by: 1127 mb
  changed: 50 MB
  free: 205 Mo
  ===================================

  TOTAL MO 8181

  THAT IS WHY I AM NOT ABLE TO ACCESS A VM MACHINES MORE...

  because around 5 GB ram memory is locked by h/s reserved memory...

  I asked the question of details for very specific reasons (your question of OS architecture).  This is important.

  You have 32-bit Windows.  It does support up to 4 GB of memory (and not made up to 4 GB of memory available for anything whether it is running under the Windows 32-bit operating system said.)   The "up to" is explained by the way your hardware (video card is usually a large part) must also as the memory of some process.  Generally, a Windows installation of 32 bits in a system with 4 GB or the physical RAM plus will show between 2.89 and 3.75 GB available for the system to use.  So if you have 16 GB of physical memory - you only have access to between 2.89 and 3.75 GB of it through the operation of 32 bits, you have chosen to run.  The variance, again, depends on factors, including your hardware.

  If you want to use the memory between 4 and 8 GB, even in a virtual machine, you will need to install 64-bit Windows.

  You could go far in this, understand exactly why your device video (and other components) use a portion of the memory up to 4GB in your 32-bit operating system - but since you're not (AFAIK) using a Macintosh computer, and most likely, your system is 64-bit capable... your best bet is to get a version of 64-bit Windows installed and actually enjoy the equipment you bought.

• 1240AG vs 1522 outdoor

  Installation of wireless coverage (no mesh) outside in a business park. Mounting on the sides of buildings (10 meters from the ground). If 1240AG is used the PA will be mounted inside the building or outside in one envelope, if 1522 used the AP will be mounted outside. Problems mounting are not considered here. The question: is there an advantage to the use of 1522 against 1240AG? Only 2.4 ghz coverage is necessary, the 5 GHz could be used for the redirection in the future. 1522 2.4 ghz power max is 300mW, while 1240AG 2.4 ghz power max is 50 MW. I think that regardless of this difference I suppose always the distance max 300 feet to the customer. Clients are laptops and smartphones.

  Roman,

  I've done both and both have their advantages and disadvantages.  What to watch in your design, is the customer.  What type of customer and how you can match to the top of the record customer than the AP.  When we used a 1522 for wireless coverage, customers had HI output cards that turn off also 200mW and we could make this work and extend coverage where using an internal AP (100mW max) would not provide.  However, the indoor access point has it's pro... especially with normal customers... laptops, iPads, etc..  They are cheaper, but the mounting material can increase the fairly high cost.  With the inside of the AP, you can associate basically TX AP exit with customers.  Required data rate can also be a problem in your choice, so know that customers, you will have WiFi outdoor and rquirements looking, either one can work.

• Local vs remote

  Oracle on Linux 11.1

  ADR 2.0.10

  According to best practices of security, the server applications (intermediate level) must reside on a separate server from the database server. ADR is connected to the database using JDBC Oracle, so it can just as easily connect to anyserver:db:1521 as localhost:db:1521.

  Questions

  1. given a sufficiently fast (Gigabit) LAN, is there any deterioration in performance for APEX applications when ADR and the database are on different servers? Is it still important?

  2. given that the ADR is based on Java, are there advantages/disadvantages to the installation of ADR/Tomcat on a Linux box vs a Windows box? Is it still important?

  Thank you

  Network latency can always introduce a drop in performance.  With locking servers and fast network, it will be minimal so sensitive at all.  As you mention it's the best practices and most of the deployments are made this way.

  There is no difference to the ADR on windows or linux (except linux is better)

• Album App do not display images of internal storage

  Hello
  I use a ultra Xperia Z

  I always have problems with my album app, it shows no content from the internal memory, but only from SD card. I tried to clear the cache of data and restarted the phone, but it does not help. I recently updated my OS to lollipop 5.1.1 it worked once, but as soon as I plugged the phone on the laptop it stopped to show the content of the internal memory. He gave me problems even if you use 4.4.2

  The version of the album App is 7.3.A.0.4, please make a permanent fix because it's very annoying to have to go through the file Commander to display images from the internal memory.

  Thanks in advance

  When you try to change something on the external SD card using advantage 3:rd app, you must allow access to the application.

  In Total Commander you have to get a popup saying 'Write protected!', then press 'OK', then select the SD card on the left side menu och then press "confirm" at the bottom. Total order then deletes the file.

  And when the file has been deleted, don't forget to erase the data to storage media and then reboot the phone. It can also take a little while for the phone to analyze all of the media, which may take a little while before, you see all the pictures.

  Which you must use the file manager is a matter of preference. You can have both installed if you want to.

• What is the difference between TopLink Essentials &amp; EclipseLink?

  What is the difference between TopLink Essentials & EclipseLink?
  What is the best?

  EclipseLink

  EclipseLink is the open source Eclipse Foundation Eclipse persistence Services project. The software provides an extensible framework that allows Java developers to interact with the various services of data, including databases web services, mapping of the object XML (OXM), and Enterprise Information System (EIS). EclipseLink supports a number of persistence standards, including:

  * Java Persistence API (JPA)
  * Java API for XML Binding (JAXB)
  * Java Connector Architecture (JCA)
  * Service Data Objects (SDO).

  EclipseLink is based on the TopLink product, which Oracle contributed the source code to create the EclipseLink project. The original contribution came from the code base of TopLink 11g, and contributed all of the code-base/a feature, with only some EJB 2 CMP and some specific integration Oracle deleted AS minors. This differs from the contribution of TopLink Essentials Glassfish, which excluded some key enterprise features. The package names were changed and some of the code and configuration has been moved.

  The user of Workbench TopLink Mapping interface also contributes to the project.

  EclipseLink is the way forward for persistence for Oracle and TopLink. It is expected that the next major version of Oracle TopLink will include EclipseLink as well as the next major release of Oracle ACE.

  EclipseLink supports usage in an OSGi environment.

  Sun Microsystems has selected the EclipseLink project either for JPA 2.0 reference implementation.

  TopLink Essentials
  TopLink Essentials is the implementation of reference of the EJB 3.0 Java Persistence API (JPA) and the edition of the open-source community of Oracle TopLink product. TopLink Essentials is a limited version of the specialty. For example, TopLink Essentials doesn't provide synchronization between a cluster application cache, a cache invalidation strategy and Cache query.