Is it possible clear the class loader cache programatically?

Hi,
Is it possible clear the class loader cache programatically?
Thanks

By the cache do you mean the loaded classes? If so, you can do that by discarding any pointer you have to the class loader and creating a new class loader. ...though I wonder why you would need to do that...

Similar Messages

Class loader & cache

Hi!
I have developed an application that use CLASS LOADER methods to download classes when needed in the application.
I would like to know if there exist any way to use a JRE cache for using these classes and download it when it changes.
Thank you very much for any help!
Jose Monzon.

Hi,
Class is put into the cache of the class loader in the
defineClass() method and may be retrieved from the cache with the findLoadedClass() method.
Check the above methods for caching.
I hope this helped.
Roopasri Vittal
Developer Technical Support
Sun Microsystems
http://sun.com/developers/support

Weblogic Class Loader caching/writing classes to weblogic/myServer/classfiles

It seems that if I compile a class that a JSP uses while Weblogic is
          running, Weblogic's class loader has this nasty habit of caching/writing
          the class that already has loaded into memory into:
          weblogic/myServer/classfiles
          Weblogic then refers to the older class file under the above directory
          when the server is started again. Is there any way to turn this "class
          loader caching" off in Weblogic? Thanks!
          -hjk


You have to tell WLAS where to load your new classes. You can change
          workingDir of your JSP configuration in weblogic.properties to point to your
          new class directory.
          Cheers - Wei
          Hyung-Jin Kim <[email protected]> wrote in message
          news:[email protected]..
          > It seems that if I compile a class that a JSP uses while Weblogic is
          > running, Weblogic's class loader has this nasty habit of caching/writing
          > the class that already has loaded into memory into:
          >
          > weblogic/myServer/classfiles
          >
          > Weblogic then refers to the older class file under the above directory
          > when the server is started again. Is there any way to turn this "class
          > loader caching" off in Weblogic? Thanks!
          >
          > -hjk
          >

How to clear the directory server cache?

How to clear the directory server cache?
we are using the directory server 5.2
Thanks,
Subbu

try asking it here - http://forum.java.sun.com/forum.jspa?forumID=761

Referencing external classes in the classes loaded into ORACLE8i

Hi
If I have to load a .class file into oracle8i and if it references another class XYZ.class file in the path /export/home/user what should I do to resolve during the loading. What happens if XYZ.class imports from a test.jar.
Thanx

Any external class references from classes loaded in ORACLE 8i must also be loaded into the database. The classes loaded into the db must be transitively closed. All external class reference must be either in the CORE Java api's (provided by Oracle) or must be loaded with the class in question.

RMI and the class loader delegation model

Hello,
I need to know what the class loader delagation chain looks like when RMI does dynamic class loading. What is the RMIClassLoader's parent? Does it delegate to Thread.currentThread().getContextClassLoader()?
In a test application I can debug the chain which looks like this:
sun.misc.Launcher$AppClassLoader@bac748
sun.misc.Launcher$ExtClassLoader@7172ea
The AppClassLoader is the class loader for the test and is coincident with getSystemClassLoader(). Its parent is the ExtClassLoader which I believe is in charge of loading anything from jre/lib/ext. But I don't know how to get a reference to the RMIClassLoader in order to find out what it's parent is.
I would appreciate any info on this.
Thanks in advance,
Joe

Well that was easy.
I just used the RMIClassLoader.getClassLoader(String codebase) and was able to determine the chain.
FYI: the chian is as follows:
ExtClassLoader <-- AppClassLoader <-- sun.rmi.server.LoaderHandler
Of interest, if you have a custom class loader its parent will most likely be the AppClassLoader but the rmi class loader will not chain off of your custom class loader. It does some interesting things in order for this to work. It will look for custom class loader to load interfaces but will use the RMIClassLoader to load stubs. Pretty cool.
Thanks anyway.
Joe

How to clear old class files cached in JVM

JVM stores old class files in its cache even after the corresponding files have been deleted from the database. This causes a conflict if a new file is saved with the same name as one that was deleted earlier causing old data to be fetched and not the new one.
am using the following line of code to load the class file :
Class.forName(className, false, this.getClass().getClassLoader())
please help
Thanks - N

Why are you trying to do that?
Dynamic Classloading(reloading) has a meaing only on "application container" like WAS.
Not appropriate for normal applcation.
Focus on enhancing your application logic and algorithm rather than wasting your brain on difficult and meaningless things. Applying some flexible design patterns wouldn't suffice?
Anyway, Sun provides wonderful and simple custom classloader sample.
http://java.sun.com/developer/onlineTraining/Security/Fundamentals/magercises/ClassLoader/help.html
Anayzing tomcat source(which is downloadable) is another approach.
Edited by: Dion_Cho on Nov 26, 2007 5:18 PM
Typo...

How can I clear the Quicktime menu cache?

My quicktime player has 10 old file names cached. They show up when I right click a running QuickTime.app ; and they show up when I choose "Show recents". They are not connected to any actual file (I've removed the files), but I cannot make them go away. The help page says to use File | Open Recent | Clear Menu, but the "Clear Menu" choice is grayed out (and no recent files appear there). Clear Menu did seem to work, exactly once, though I cannot recall if the movies were the same names or some other set.
This appears to be a bug which has two components:
Clear Menu should just work; and doesn't
QuickTimePlayer should have a preferences pane that allows me to choose a reasonable number of prior file names to cache (say 0 to 20). Somewhat amazingly, it has no preferences pane at all.

Jon Walker wrote:
The help page says to use File | Open Recent | Clear Menu, but the "Clear Menu" choice is grayed out (and no recent files appear there). Clear Menu did seem to work, exactly once, though I cannot recall if the movies were the same names or some other set.
This only seems to work before you delete/remove the referenced files. I.e., it appears the "Clear" routine may actually check the link(s) for validity and if no longer valid, aborts the "Clear" routine. Be advised that you get similar results if you have an active RSS reference, deleted the sourced web site, and then try to clear the RSS reference entry.
That is pretty much what I had decided. This is still a bug, though: Clear Menu should just work.
Jon Walker wrote:
QuickTimePlayer should have a preferences pane that allows me to choose a reasonable number of prior file names to cache (say 0 to 20). Somewhat amazingly, it has no preferences pane at all.
The preference already exists. Check out "System Preferences > General > Number of Recent items > Documents" option allows settings of None, 5, 10 (default), 15, 20, 30, and 50. Similar opts arew available for recent "Applications" and recent "Servers" settings. This area also controls the "Resore windows when quitting and re-opening apps" option.
This too is a bug. I do not want the same number of "recent" items for all my apps. KISS principle should be "Keep It Simple, Stupid, But Only As Simple As Possible." My usual technique is to provide an adjustable global default for such things, with added individual adjustments. That way folks who have no issue never touch it, folks with a plain vanilla requirement touch one thing and folks who have complex requirements have a complete set of valves and switches under the red cover.

How to clear the OTHER memory cache

Hi there fire fox help,
I have read the page on 'How to clear the cache' but this does not seam to clear everything.
When I am editing a website on my computer and viewing the changes through fire fox everything works great, I just hit refresh.
But when testing the websites changes online (after unloading it) I can not see any changes, using the refresh button is of no help and clear the cache is not helping either.
I get quite frustrated with this as I then have to change the name of the web page just to get fire fox to refresh it properly and then change it back again.
Thanks for your time, Max

I've tried all these and Firefox still won't load the current image. I know it's there because Internet Explorer does load it. Is there anything else I can try or look at?

How to clear the ADF Entity cache

Hi All,
While I'm using an entity based updatable view object,after deleting a record,I created a new record with the same key,It displays the deleted record instead of new record.
Sample steps:
1.Create a updatable view object with key attribute name sequence.
2.I dropped this as table in the view page.
3.I created a new record for this using CreateInsert action
4.I entered the values for this new record.
5.I deleted the new record
6.Again I created a new record.
7.If I enter the previous sequence value,it displays the old record values, If I enter a different value the delete record does not affect this.
So I think,I need to clear the entity cache, but I have used clearCache() of ViewObjectImpl, there is no change.
If anyone came across the problem and fixed,Please let me know the solution.
Regards,
Felix

You are wrong here. if you don't commit the delete, the record is still there.
You should not enter the same sequence again anyway. a sequence should be a one time number, once used it's gone. set the new key using a groovy expression and make it read inky in the ui.
Timo

Clear the selection screen cached values

Hello BW gurus,
Is there a way to clear the contents of the selection screen(cached variable values) whenever it is refreshed?
Thanks,
madhuri

Hi Madhuri,
Please check this link if any use let me know
http://help.sap.com/saphelp_crm50/helpdata/en/6e/798e07b33b11d5993800508b6b8b11/frameset.htm
thanks
Ranganath

Clearing the BlackBerry World cache

Hi there!
In BlackBerry OS you could clear the AppWorld cache by pressing ALT + RSTRST. Did anyone find out yet how this is done on BlackBerry 10. There is nothign yet about BlackBerry 10 in the KB (http://btsc.webapps.blackberry.com/btsc/viewdocument.do?externalId=KB24714&sliceId=2&cmd=displayKC&d...

Hey Binij
You can tell if you see the icon on twitter?
To use it you must have data plan or BIS.
Regards.
Kudos ** Do not forget to give those people who help and advise you regarding your questions ** Can
Accept as Solution to ** Comments **
@gutijose14
BBM Channels PIN: C0007093A
Do not forget to give LIKE Those people who help you and advise you about your doubts. if the review has been SOLVED** # 4LL #ÉliteRoad Make a backup of your BlackBerry
BlackBerry Protect and BlackBerry Link constantly. #ichooseBlackBerry10 Gutijose14 Forums Veteran I

Clearing the outgoing mail cache

How do I clear the outgoing cache for my mail since I can only receive and not send emails?
I got assistance from Apple with this once before but I can't remember how anymore, and now they won't help me.
I'm pretty sure it has something to do with the 'Library'?
Thanks

IIRC, I was told it was dangerous to do if anything at all was running.
I always use Applejack...
http://www.versiontracker.com/dyn/moreinfo/macosx/19596
After installing, reboot holding down CMD+s, then when the prompt shows, type in...
applejack AUTO
Then let it do all 5 of it's things.
The 5 things it does are...
Correct any Disk problems.
Repair Permissions.
Clear out Cache Files.
Repair/check several plist files.
Dump the VM files for a fresh start.

I have a s-l-o-w MacBook. I cleared the cookies and cache. I tried loading Norton

I tried loading Norton Internet Security because I thought I had a virus. Any ideas to speed things up?

Never ever ever download Not on AntiVirus it will do more ham than any good. Remember you are running a Mac not a PC and you don't have to worry about Viruses.
Anything you would or could download would be a Malware, and would thus cause more issues rather than fix anything.
This is from John Galt and should be followed to a tee.
Back up your Mac, if you have not already done so. To learn how to do that read Mac Basics: Time Machine backs up your Mac.
Then, consider running EtreCheck and posting its report. Read about it here. It contains a link to download EtreCheck. Do not download it from anywhere else (such as may be found by following the results of an Internet search).
DON

Clear the applet from cache

Hello,
I use the following html code to open my signed java applet.
<APPLET CODE="Applet.class" ARCHIVE="applet.jar" WIDTH=100 HEIGHT=100>However if I make some changes into the applet code and open the HTML file in the browser, I see that the applet is being picked up from the applet cache. Thus if users have caching enabled on their systems they will not be able to retrieve the new version that I have made.
Is there a way to trigger the browser to download not to use the applet from the cache whenever an updated copy is available on the server.
I need this fix for IE, Mozilla, Netscape..
Thanks in advance.

Hello,
the easiest solution (for me, at least, it was): when you want to reload an applet type x in the java console (it openes when you load the applet; if it doesn't open you may find it in the icons bar at the bottom of your screen) and then reload the applet
Hope it helps, good luck!

Is it possible clear the class loader cache programatically?

Similar Messages

Maybe you are looking for