Shared class definition memory

I just received notification that this bug (RFE) have been closed (well solved really)
http://developer.java.sun.com/developer/bugParade/bugs/4416624.html
matfud

I think that it is only the class definitions that are
shared. Instances of the classs are created
independently
by each VM.
The technique they have chosen should speed up loading
of system (and perhaps other) classes as
their files no longer need to be individually opened
and verified (acutally they may still need to be
verified).
Instances of the classes will not be shared though.
Something will be shared. I suspect it will be the methods primarily. From the explaination in the bug...
First, a portion of the shared archive, currently between five and six
megabytes, is mapped read-only and therefore shared among multiple JVM
processes.

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HELP!!! I did everything i could all day to fix this and i can't upload my video to youtube or export file because it keeps saying "sharing requires more memory to be available" How do i enable my movie to be uploaded or exported?

Question 1 / Plan A : When i finished making my movie project in iMovie 11 on Mac, i tried sharing it at all ways such as youtube, export, etc... it kept popping up: "sharing requires more memory to be available". I searched up all day on the internet on how to figure this out, i followed all of their advices but nothing seems to happen. btw i already got permitted for longer than 15 mins video on youtube. it's also weird that my computer has more than 600GB free space. So how do i upload my 2 hour video to youtube? and how do i avoid the popup of "sharing requires more memory to be available"?
Question 2 / Plan B: If plan A won't work out, i definitely don't wanna do this all over again because i took centuries and effort on this. What im trying to do is divide them to multiple projects, and maybe it will let me upload it because of it's file size? So how do i copy parts from a project and paste it to another project or event library so it would be easier for me to finish it in iMovie?
Question 3 / Plan C: If plan B won't work out, how do you screen record my movie with audio? What im trying to do is to record it by screen using quicktime and divide them by parts. I know how quicktime and soundflower works, but when i tried it, but the problem is that soundflower and quicktime audio was very crappy and broken at some point. So how do i record good quality audio with screen recording?
Question 4 / Plan D: If plan C won't work out, i guess the worst way to do this is to record from my phone, its such a bitter idea but i want this to be published in good quality. i am so tired and i took so weeks finishing this project and the ending results just ****** me off. Id be glad if someone has an idea on this problem im occurring. Hope y'all people and mac experts understood on what im struggling about. leave a reply on those of you who might have an idea on solving this problem!

When You select share, are you able to get either of these two windows?
First one is Export As
Second one is Save as QuickTime
I looked at earlier post and see You have 4GB RAM, maybe try a smaller format to convert it to,
then save it to file first before trying YouTube.

"shared pool free memory" include "SHARED_POOL_RESERVED_SIZE" area??

Hi, all.
"shared pool free memory" from v$sgastat include "SHARED_POOL_RESERVED_SIZE" ??
For example,
select * from v$sgastat
where pool ='shared pool'
and name like 'free memory'
assuming that the result of the above query is about 100Megabytes
and "SHARED_POOL_RESERVED_SIZE" is 50Megabytes,
"100 M free memory" in shared pool includes 50M (reserved area)??
Thanks and Regards.
Message was edited by:
user507290

Shortly after the database starts up, some of the 'shared_pool_reserved_size' will probably be in use, although quite a lot of it may still be free; so you cannot say (directly) how much of the "free memory" belongs in the reserved area and how much comes from the rest of the shared pool.
However, there is a view called v$shared_pool_reserved that tells you how much of the reserved area is currently free (and gives various other statisics about the pool's use). There are some versions of Oracle where the definition of this view is wrong, though - possibly in the lower 9i versions.
Regards
Jonathan Lewis
http://jonathanlewis.wordpress.com
http://www.jlcomp.demon.co.uk

Best practice to handle the class definitions among storage enabled nodes

We have a common set of cache servers that are shared among various applications. A common problem that we face upon deployment is with the missing class definition newly introduced by one of the application node. Any practical approach / best practices to address this problem?
Edited by: Mahesh Kamath on Feb 3, 2010 10:17 PM

Is it the cache servers themselves or your application servers that are having problems with loading classes?
In order to dynamically add classes (in our case scripts that compile to Java byte code) we are considering to use a class loader that picks up classes from a coherence cache. I am however not so sure how/if this would work for the cache servers themselves if that is your problem!?
Anyhow a simplistic cache class loader may look something like this:
import com.tangosol.net.CacheFactory;
* This trivial class loader searches a specified Coherence cache for classes to load. The classes are assumed
* to be stored as arrays of bytes keyed with the "binary name" of the class (com.zzz.xxx).
* It is probably a good idea to decide on some convention for how binary names are structured when stored in the
* cache. For example the first tree parts of the binary name (com.scania.xxxx in the example) could be the
* "application name" and this could be used as by a partitioning strategy to ensure that all classes associated with
* a specific application are stored in the same partition and this way can be updated atomically by a processor or
* transaction! This kind of partitioning policy also turns class loading into a "scalable" query since each
* application will only involve one cache node!
public class CacheClassLoader extends ClassLoader {
    public static final String DEFAULT_CLASS_CACHE_NAME = "ClassCache";
    private final String classCacheName;
    public CacheClassLoader() {
        this(DEFAULT_CLASS_CACHE_NAME);
    public CacheClassLoader(String classCacheName) {
        this.classCacheName = classCacheName;
    public CacheClassLoader(ClassLoader parent, String classCacheName) {
        super(parent);
        this.classCacheName = classCacheName;
    @Override
    public Class<?> loadClass(String className) throws ClassNotFoundException {
        byte[] bytes = (byte[]) CacheFactory.getCache(classCacheName).get(className);
        return defineClass(className, bytes, 0, bytes.length);
}And a simple "loader" that put the classes in a JAR file into the cache may look like this:
* This class loads classes from a JAR-files to a code cache
public class JarToCacheLoader {
    private final String classCacheName;
    public JarToCacheLoader(String classCacheName) {
        this.classCacheName = classCacheName;
    public JarToCacheLoader() {
        this(CacheClassLoader.DEFAULT_CLASS_CACHE_NAME);
    public void loadClassFiles(String jarFileName) throws IOException {
        JarFile jarFile = new JarFile(jarFileName);
        System.out.println("Cache size = " + CacheFactory.getCache(classCacheName).size());
        for (Enumeration<JarEntry> entries = jarFile.entries(); entries.hasMoreElements();) {
            final JarEntry entry = entries.nextElement();
            if (!entry.isDirectory() && entry.getName().endsWith(".class")) {
                final InputStream inputStream = jarFile.getInputStream(entry);
                final long size = entry.getSize();
                int totalRead = 0;
                int read = 0;
                byte[] bytes = new byte[(int) size];
                do {
                    read = inputStream.read(bytes, totalRead, bytes.length - totalRead);
                    totalRead += read;
                } while (read > 0);
                if (totalRead != size)
                    System.out.println(entry.getName() + " failed to load completely, " + size + " ," + read);
                else
                    System.out.println(entry.getName().replace('/', '.'));
                    CacheFactory.getCache(classCacheName).put(entry.getName() + entry, bytes);
                inputStream.close();
    public static void main(String[] args) {
        JarToCacheLoader loader = new JarToCacheLoader();
        for (String jarFileName : args)
            try {
                loader.loadClassFiles(jarFileName);
            } catch (IOException e) {
                e.printStackTrace();
}Standard disclaimer - this is prototype code use on your own risk :-)
/Magnus

Java Shared Classes Article

Java applications face a problem today: The only containment vessel available to them is the Java virtual machine (JVM) process itself. Multiple JVMs are required to isolate Java applications from each other, and this has two major negative impacts: start up time and memory. This article discusses the concepts behind shared classes in JVMs, how they work, and how this technology could potentially be exploited by users.
http://www-106.ibm.com/developerworks/java/library/j-shared/?ca=dgr-jw03j-shared

And I would guess that the alias powelljgr exists solely to promote "articles".

Duplicate class definition error while invoking EJB from ADF project

Hi,
I am using Jdeveloper TP3 and facing the following problem.
I have built an EJB project and am ran them successfully in the embedded OC4J via a standalone java program.
Now I created another project with ADF capabilities and when I tried to ping the EJB i get the following exception
The application named, current-workspace-app, could not start due to an error.
duplicate class definition: javax/faces/context/FacesContextFactory Invalid class: javax.faces.context.FacesContextFactory Loader
This is happenning due to class conflicts between javaee.jar and trinidad-impl.jar/adf-richclient-impl.jar.
Is there any way of bypassing this class loader issue?

Hi,
actually I didn' try the JNDI lookup but used resource injection instead
In a JSF managed bean I use
@EJB Ejb30SessionFacadeLocal myLocalInterface;
public SortableModel getTableModel() {
List rows = new ArrayList<Employees>();
rows = myLocalInterface.queryEmployeesFindAll();
this.tableModel = new SortableModel(rows);
return tableModel;
Its a EJB 3.0 session bean that accesses a Local interface. However, if the remote is on the same server then I would think that using @EJB Ejb30SessionFacadeRemote myRemoteInterface; does similar
Frank

Java.lang.LinkageError: duplicate class definition

Dear Experts,
We are in the process of Migrating current Mi2.5 application to NWM7.1.
We have that 2.5 application properly running in production system but in 7.1 while opening some JSP page of application
it sometimes opens properly & sometimes gives this error..
java.lang.LinkageError: duplicate class definition
The detailed error description is as given below..
Pls advice..

Error: 500
Location: /ZEFL_BP_MI/jsp/stock/bp_technicians_issue_sparesforms.jsp
Internal Servlet Error:
java.lang.LinkageError: duplicate class definition: com/sap/BP/bean/TableViewBean
at java.lang.ClassLoader.defineClass1(Native Method)
at java.lang.ClassLoader.defineClass(Unknown Source)
at java.lang.ClassLoader.defineClass(Unknown Source)
at org.apache.tomcat.loader.AdaptiveClassLoader.doDefineClass(AdaptiveClassLoader.java:575)
at org.apache.tomcat.loader.AdaptiveClassLoader.loadClass(AdaptiveClassLoader.java:542)
at java.lang.ClassLoader.loadClass(Unknown Source)
at java.beans.Beans.instantiate(Unknown Source)
at java.beans.Beans.instantiate(Unknown Source)
at jsp.stock.bp_0005ftechnicians_0005fissue_0005fsparesforms._jspService(bp_0005ftechnicians_0005fissue_0005fsparesforms.java:101)
at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:119)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
at org.apache.tomcat.core.ServletWrapper.doService(ServletWrapper.java:405)
at org.apache.tomcat.core.Handler.service(Handler.java:287)
at org.apache.tomcat.core.ServletWrapper.service(ServletWrapper.java:372)
at org.apache.tomcat.facade.RequestDispatcherImpl.doForward(RequestDispatcherImpl.java:222)
at org.apache.tomcat.facade.RequestDispatcherImpl.forward(RequestDispatcherImpl.java:162)
at com.sap.ip.me.api.runtime.jsp.AbstractMEHttpServlet.dispatchRequest(AbstractMEHttpServlet.java:780)
at com.sap.ip.me.api.runtime.jsp.AbstractMEHttpServlet.doGetThreadSafe(AbstractMEHttpServlet.java:281)
at com.sap.ip.me.api.runtime.jsp.AbstractMEHttpServlet.doGet(AbstractMEHttpServlet.java:552)
at com.sap.ip.me.api.runtime.jsp.AbstractMEHttpServlet.service(AbstractMEHttpServlet.java:190)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
at org.apache.tomcat.core.ServletWrapper.doService(ServletWrapper.java:405)
at org.apache.tomcat.core.Handler.service(Handler.java:287)
at org.apache.tomcat.core.ServletWrapper.service(ServletWrapper.java:372)
at org.apache.tomcat.core.ContextManager.internalService(ContextManager.java:806)
at org.apache.tomcat.core.ContextManager.service(ContextManager.java:752)
at org.apache.tomcat.service.http.HttpConnectionHandler.processConnection(HttpConnectionHandler.java:213)
at org.apache.tomcat.service.TcpWorkerThread.runIt(PoolTcpEndpoint.java:416)
at org.apache.tomcat.util.ThreadPool$ControlRunnable.run(ThreadPool.java:501)
at java.lang.Thread.run(Unknown Source)
Regards,
Saptak

Class definition

hello, i need a class definition for a digital watch in Java.

1. you'll pass 3 parameters into the constructor (1 for time, 1 for alarm, 1 for ...).
2. your setTime and setAlarm methods will look something like this:
void setTime(param)
timeVariable = param;
void setAlarm(param)
alarmVariable = param;
Simple as that. Hope this helps!!

Class Definition & Implementation

Hi,
In JAVA or Other OOP languages the class definition & implementation are doing within the same task i.e with in the class only they are defining & implementing.But when it comes to ABAP the definition part & implementation part of a class are divided into 2 tasks. Why they are designed like that?

Hi Suresh Reddy,
The main intention behind this design is
" to differentiate the class definition and implementation clearly ."
Even if you have a chance to including both class definition and implementation in same structure, it is difficult to differentiate these things in lengthy implementation classes.
Thank you,
Prasad GVK.

When I try to finalize my project a message pops up, "Sharing requires more memory to be available." How do I work this issue out?

When I try to finalize my project a message pops up, "Sharing requires more memory to be available." How do I work this issue out?

https://support.apple.com/kb/TS1567
Ah, it has been mentioned daily esp since iOS 5 / iTunes 10.5 but has always been there as an issue.
Order of attempts:
Repair the installers
Uninstall EVERY Apple component (auto and manual)
Services: Restart all 3 Apple items (AMS, Bonjour, iPod)
I* always do the last almost, then launch iTunes, and only then connect iPod.
IF you see a yellow alert in Devices and Printers or in Device Manager, then I could find NO WAY to fix or repair other than a clean OS. Something messed up the device driver support.
If/when Windows asks "what to do when it detects iPod"? don't chose any default action, to me, based on hunch and 3 PCs, that seems to mess AMS up for some reason.
Tried with Windows 7 64-bit Pro and Home Premium, and also Deve Preview 8 (which other than the inability to update iOS to 5.0 seems to run better -- except when it comes to AMS thing! so seems Apple is not on the same page writitng drivers.

Is the "Device Class Definition for Physical Interface Devices" specification implemented in Windows?

Can I assume that Windows will be able to handle my physical interface device if I follow the "Device Class Definition for Physical Interface Devices" specification while writing the firmware?
I'm trying to develop a device which handles rumble output from applications such as games. Applications would include e.g. racing games or simulators. I'm hesitant to just clone Xbox 360 Gamepad or Sidewinder USB reports. I'd like to correctly declare my
device as something on its own while still making use of already implemented OS-specific drivers. The purpose of the mentioned specification is exactly that as far as I can tell. I wasn't able to find concrete information about its level of support though.
The "USB device class drivers included in Windows" page (sorry I'm not allowed to post links yet..) seems to link to WinUSB which I'm not sure what to do with.

Thanks for your response. Well if everything was implemented at that time and it's still available it should be fine since the specification document's last version is dated 1999. I was just hoping there would be any form of documentation whether it's
supported and by which degree so I don't go through the trouble of figuring out how the firmware should be written according to the specification just to find out there is no OS driver implementation for it which would render my work more or less useless.
So I suppose I'm forced to go the trial and error path?

Class file/memory mismatch

I ma trying to compile a source code in 64 bit Solaris. The same code works fine with 32 bit but on 64bit it shows the following error -
ld: elf error: file /usr/users/PLAT/cltxm25/atm/generic_archive-smdxp83/generic_archive/tlvcreation.a(keyfields_populate.o): elf_getshdr: Request error: class file/memory mismatch
ld: elf error: file /usr/users/PLAT/cltxm25/atm/generic_archive-smdxp83/generic_archive/tlvcreation.a(tlvcreation_populate.o): elf_getshdr: Request error: class file/memory mismatch
I check $file keyfield_populate and it is ELF 64-bit MSB relocatable SPARCV9 Version 1. Same is the case with tlvcreation_populate.o
Please advice something on this.

i got the same error when compiling hypre (http://www.llnl.gov/CASC/hypre/) on amd64. It works fine in 32 bits, but in 64, you have to verify LDFLAGS, in case of hypre, i have to modify Makefile to take "-m64" into account, and now, everything works fine (32 and 64)
hth,
gerard

Web server to download class definitions?

Hello,
There's still one thing that i do not understand about RMI.
I find on the website below the following quote "Classes definitions are typically made network accessible through a web server".
http://java.sun.com/docs/books/tutorial/rmi/overview.html
However, I have created and tested a small RMI example, and there was no need for a webserver (although, i tested my small rmi testapp both client and server on the same machine).
By the way, my small testapp was:
- an interface that extends java.rmi.remote and defines one method that returns just a string "ok".
- the implementation of that interface
- a client that calls the that remote object, and it prints "ok", without problems.
Thus, what is this kind of "webserver" then???
Why does everything works in my small testapp, without a webserver??
Or is there a webserver that i can not see??
Am I missing some information, or do i see something wrong???
Thank you.

is that maybe necessary when we have the rmi server, the rmi client and the rmi registry on three different machines?

Flash.utils.getDefinitionByName vs. ApplicationDomain's class definition methods?

What's the difference between these two method groups in terms of the set of classes they work with (i.e. ApplicationDomain's class definition set vs the set of class definitions getDefinitionByName uses)?
ApplicationDomain. getDefinition / hasDefinition / getQualifiedDefinitionNames (Flash Player 11.3+ only, appears to be undocumented?)
getDefinitionByName
It's clear that there's an application domain hierarchy and that definitions may be visible in some app domains and not others. For example, would ApplicationDomain.getDefinition return a definition that is not defined in the given app domain but is accessible from it? (e.g. if the domain is a child domain and we're looking up a definition defined in the parent?) The documentation for ApplicationDomain just says "Loaded classes are defined only when their parent doesn't already define them." but it also says "(ApplicationDomains) allow multiple definitions of the same class to exist and allow children to reuse parent definitions."
The documentation also indicates that getDefinitionByName returns class definitions, whereas ApplicationDomain.getDefinition will return namespace and function definitions in addition to class definitions.
Assuming I'm only interested in class definitions, what ApplicationDomains does getDefinitionByName search? (e.g. all domains, the current/caller domain only, or any domains accessible to the caller?)
This initial test is confusing:
import flash.system.ApplicationDomain;
var d:ApplicationDomain = new ApplicationDomain( ApplicationDomain.currentDomain ); //child of current domain
trace(ApplicationDomain.currentDomain.hasDefinition("flash.display.DisplayObject")); //true
trace(ApplicationDomain.currentDomain.getQualifiedDefinitionNames().length); //1 (the main timeline class definition only: Untitled_fla::MainTimeline)
trace(d.hasDefinition("flash.display.DisplayObject")); //false
On the one hand, getQualifiedDefinitionNames reports that only the main timeline class is defined in the current app domain, yet getDefinition returns true for DisplayObject, indicating it reports the existence of definitions in the parent (system) domain, yet the final trace on the grandchild domain contradicts that by returning false.
ApplicationDomain.currentDomain.parentDomain also returns null, which directly contradicts the following documentation statements: "The system domain contains all application domains, including the current domain..." and "Every application domain, except the system domain, has an associated parent domain. The parent domain of your main application's application domain is the system domain."
The contradiction is very apparent here, where currentDomain has the definition, but when you create a child domain and access the parent, which should be currentDomain, it suddenly reports that it doesn't contain the definition:
trace(ApplicationDomain.currentDomain.hasDefinition("flash.display.DisplayObject")); //true
trace((new ApplicationDomain( ApplicationDomain.currentDomain )).parentDomain.hasDefinition("flash.display.DisplayObject")); //false! why?
And of course, you can't compare instances because (ApplicationDomain.currentDomain == ApplicationDomain.currentDomain) is actually false.

To answer my own question somewhat...
This page is quite comprehensive: http://www.senocular.com/flash/tutorials/contentdomains/?page=2 I've managed to solve a couple mysteries, but the basic question outlined above (particularly concerning the scope of getDefinitionByName) still stands. I just wanted to post an answer for what I was able to resolve.
Retreiving the parentDomain returns null if the parent is the system domain. So although the parentDomain is the system domain, the parentDomain property returns null anyway. That's just the way it is. Unfortunately, that makes the system domain inaccessible, for example, for class enumeration through getQualifiedDefinitionNames.
Concerning my initial test, it seems that constructing a new ApplicationDomain creates a dead object until a SWF is actually loaded under that domain. For example, creating a child domain of the current domain and calling hasDefinition on it will return false, but if you assign that very same instance to a loader context an pass it to Loader.load, once the load completes, you can call hasDefinition on the instance that originally returned false, and it will return true instead. So you can construct an ApplicationDomain with a parent, but it won't really function until it's being actively used.
var d:ApplicationDomain = new ApplicationDomain( ApplicationDomain.currentDomain ); //child of current domain
trace(d.hasDefinition( "flash.display.DisplayObject" )); //false for now... var l:Loader = new Loader();
l.load(new URLRequest( "any.swf"), new LoaderContext( false, d ) );
l.contentLoaderInfo.addEventListener( Event.COMPLETE, completed, false, 0, true );
function completed(e:Event ):void
trace(d.hasDefinition( "flash.display.DisplayObject" ); //...and now it's true.
So it would seem that ApplicationDomain.getDefinition does report classes in the parent, grandparent, etc. domains, but it will only do so after the new ApplicationDomain instance has been activated through loading something into it.
Again, ApplicationDomain instances may refer to the same application domain, but they cannot be directly compared. For example, (ApplicationDomain.currentDomain == ApplicationDomain.currentDomain) is false.

[svn:fx-trunk] 5819: Fix asdoc issue for event description getting copied over to the class definition .

Revision: 5819
Author: [email protected]
Date: 2009-03-31 13:15:14 -0700 (Tue, 31 Mar 2009)
Log Message:
Fix asdoc issue for event description getting copied over to the class definition.
QE Notes: None.
Doc Notes: None.
tests: checkintests, asdoc tests
Modified Paths:
flex/sdk/trunk/modules/compiler/src/java/flex2/compiler/asdoc/TopLevelClassesGenerator.ja va

THank you , Nancy. Appreciate the input.
So instead of this:
<a class="brand" href="index.html"><img src="../img/logo-ca.png"alt="Consumers Advocate Review"> </a>
Would it be something like this?:
<a class="brand" href="index.html"><img src="http://ConsumersAdvocate/img/logo-ca.png"alt="Consumers Advocate Review"> </a>
And if I do that, is there a way to cope with that locally so that DW can still display the images?
jeff

Shared class definition memory

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