JAR File Caching Issues

After the security update here, http://sunsolve.sun.com/search/document.do?assetkey=1-26-103079-1 any users referencing our applets do not use the jar files stored in cache if the DNS has changed. We use an akamai hosted solution for jar distribution (though this would also occur in any DNS load balancing situation) thus the IP is rather dynamic though the content is identical. As the security issues states, any Plugin versions 1.5.0_13 and above or 1.6.0_03 and above treat a new DNS as compeltely new jar files.
Has anyone worked through similar situations? This renders the caching almost useless and we have a rather thick applet (3 Mb total jar files) which is quite an impact for a customer that is often low bandwidth to download daily.
Thanks!

Recently I tried to used some robot tools to test our application for performance issue. During the robot testing, I acceidentally discover some difference for the jar downloading which cause the above mentioned problem.
At first, this http request has no problem and the jar file is NOT downloaded. Http server shows a response code of "304", meaning download not required.
http_request
"GET lib/posLookup.jar HTTP/1.1\r\n"
"Accept: */*\r\n"
"Accept-Encoding: gzip, deflate\r\n"
"If-Modified-Since: Thu, 05 Dec 2002 17:22:12 GMT\r\n"
"User-Agent: Mozilla/4.0 (compatible; MSIE 5.5; Windows NT 4.0; T31246"
"1)\r\n"
"Host: defaulthost\r\n"
"Connection: Keep-Alive\r\n"
"Cookie: sesessionid=0001UULRZPFLU5IBRNBVHWUUAFI\r\n"
"\r\n";
Then after running for a while, the browser jumps into another page and finds that the same jar file "posLookup.jar" is required. It issue another http request to server as:
http_request
"GET lib/posLookup.jar HTTP/1.1\r\n"
"cookie: sesessionid=0001UULRZPFLU5IBRNBVHWUUAFI\r\n"
"User-Agent: Java1.3.1_02\r\n"
"Host: defaulthost\r\n"
"Accept: text/html, image/gif, image/jpeg, *; q=.2, */*; q=.2\r\n"
"Connection: keep-alive\r\n"
"\r\n";
But this time the user agent becomes Java1.3.1_02 and the accept type becomes text/html instead of original zip format. After this, I check the IE temporary file and found that the posLookup.jar is having a type of "HTML Document" instead of "Executable jar file".
Does anyone know whether this is a bug of the Internet Explorer or it is bug of the Java Plugin?
Appreciate any opinions or comments.
Thanks

Similar Messages

Jar file caching problem

I'm running applets under IE in our application. The application contains multiple pages, each page with one applet. Each applet contains some shared jar file and one specific jar file for that applet.
Most of the time, the caching mechanism work fines. The browser is able to check with the HTTP server to see if any new jar files and download automatically. If no updates, the cached jars (in browser) are used.
However, at some other times, when I jump across several pages, performing different processing, suddenly the browser will reload all the jar files from the server. Even some shared jars are reloaded in every page within the same browser session.
If above problem occurs, I close the browser, open a new one and jumping to the pages again, the browser will be able to use the cached version again.
The runtime environment as follows:
JRE 1.3.1_02
IBM HTTP server 1.3.12.6
IBM WebSphere Appl Server 3.5.3
IE 5.50 (The "Check for newer versions of stored pages" is set to "Every visit to the page")
Pages created by JSP, syntax as follows:
<OBJECT classid="<%=JSPUtil.getClassid()%>" codebase="<%=JSPUtil.getPluginCodeBase()%>" WIDTH=100% HEIGHT=175% NAME=posApplet>
<PARAM NAME=ARCHIVE VALUE="<%=JSPUtil.getSharedArchives()%>, <%=JSPUtil.getArchiveLocation()+"/posPending.jar"%>">
<PARAM NAME=CODE VALUE=ho.aia.pos.pending.applet.PendingSGP >
<PARAM NAME=NAME VALUE="PendingRequirement" >
<PARAM NAME=codebase VALUE="<%=JSPUtil.getCodeBase()%>">
</OBJECT>
Do anyone knows anything about the problem?
Anyone knows how to make the caching work NORMALLY?
Thanks

Recently I tried to used some robot tools to test our application for performance issue. During the robot testing, I acceidentally discover some difference for the jar downloading which cause the above mentioned problem.
At first, this http request has no problem and the jar file is NOT downloaded. Http server shows a response code of "304", meaning download not required.
http_request
"GET lib/posLookup.jar HTTP/1.1\r\n"
"Accept: */*\r\n"
"Accept-Encoding: gzip, deflate\r\n"
"If-Modified-Since: Thu, 05 Dec 2002 17:22:12 GMT\r\n"
"User-Agent: Mozilla/4.0 (compatible; MSIE 5.5; Windows NT 4.0; T31246"
"1)\r\n"
"Host: defaulthost\r\n"
"Connection: Keep-Alive\r\n"
"Cookie: sesessionid=0001UULRZPFLU5IBRNBVHWUUAFI\r\n"
"\r\n";
Then after running for a while, the browser jumps into another page and finds that the same jar file "posLookup.jar" is required. It issue another http request to server as:
http_request
"GET lib/posLookup.jar HTTP/1.1\r\n"
"cookie: sesessionid=0001UULRZPFLU5IBRNBVHWUUAFI\r\n"
"User-Agent: Java1.3.1_02\r\n"
"Host: defaulthost\r\n"
"Accept: text/html, image/gif, image/jpeg, *; q=.2, */*; q=.2\r\n"
"Connection: keep-alive\r\n"
"\r\n";
But this time the user agent becomes Java1.3.1_02 and the accept type becomes text/html instead of original zip format. After this, I check the IE temporary file and found that the posLookup.jar is having a type of "HTML Document" instead of "Executable jar file".
Does anyone know whether this is a bug of the Internet Explorer or it is bug of the Java Plugin?
Appreciate any opinions or comments.
Thanks

EJB 3.0: deployment/jar file generation issue

We have a web application project (ADF Faces) which depends on a model project (EJB 3.0 session/entity beans) that implements both business and persistence layers. This EJB project points to a utility jar file containing some classes we have built. When we run the web project from inside JDev, everything works perfectly, with no error. However, when generating EAR file (deploying web project to WAR) we experience an issue.
As expected, JDev generated the war file for the web app, the jar file for the EJB and finally the EAR file containing both war and jar files. After that, we managed to deploy the ear file to our OAS 10.1.3 test instance (not standalone OC4J) and an error occured. The error is due to the fact JDev did not create the /lib subdirectory inside ejb project jar file /META-INF directory with our utility jar file inside.
We tried to generate a separated jar file for the ejb project alone with the same results.
Is this an IDE bug which does not pack the application as it should? What could we be doing wrong? If yes, is there a work-around? Like I said, the application runs fine on embedded server. Also, when the EJB application does not depend on external libraries, the deployment to OAS 10.1.3 works perfectly. We have tested it!
Could anyone help us?
Thanks in advance.
Best Regards,
Gustavo
PS: Sorry for my English. :)

Hi Shay! I follow what you said and it worked. However, we had to manually edit MANIFEST file for the EJB jar in order to add classpath clause to map our util jar. IMHO, JDev should do it for us. Anyway, we were able to deploy the app successfully.
Best Regards,
Gustavo

How to determine the path of the jar file cache of javawebstart?

Hello, I need to know how to determine where the java web start application
file jar cache is stored on windows system hard drive.
I would have launch of the inner processes
I have need to know the path of file jar .
example if my application is myAppliation.jar
in code generic class of myAppliation.jar i have the command runtime
String strCmd =
System.getProperties().getProperty("java.home") + "\\bin\\java" +
     " -cp " +
     System.getProperties().getProperty("java.class.path") + ";"
     + " anotherClass.class ";
Runtime.getRuntime().exec(strCmd);
the anotherClass.class has need
of the contained library in myAppliation.jar.

Thanks i have tried this metod and function
java.net.URL resource = classLoader.getResource("myResource");
if (resource != null) {
String s = resource.toString();
if (s.startsWith("jar:")) {
int index = s.indexOf("!");
if (index > 4) {
String fileurl = s.substring(4, index);
if (fileurl.startsWith("file:")) {
String path = fileurl.substring(5);
// now path is the path to the jar file in the cache containing the resource
System.out.println("file jar: "+path);
}

JAR file cache

hi all.
i have a problem with jar file on web form. i create one jar file thru jdeveloper and write some code on keypressed event. after deploying this jar file in d:\orant\forms60\java and adding this jar file in formsweb.cfg file developer forms works fine. but the problem is after using this jar file i made some changes in the jar and deploy again in the same manner. but my developer form doesnt take the effect of the new changes. then i create new form and use the same file i surprised new form take the effect but old one not so i can change the name of the old form. after changing the name of the form it takes the effect. so how i can solve this problem bcz it creates problem when i'm using it in my live projects. how i can clear the cache for this jar file
thanks in advance
Shakeel

If you change the JAR file you can't just re-load in the browser, you have to exit the browser and start a new one, then the newer JAR will be picked up,.

Jar file caching on startup

Recently I've heard that NetWeaver, or to be precise the J2EE engine, is loading all jar files into an internal database at startup time. After that if the J2EE engine restarts, it checks for all saved jar files if the newest version is loaded.
It's as clear as daylight that this loading and checking is very time consuming and thus I want to know if this feature can be tweaked in anyway (cause my development NW takes so much time to startup -.-)
Anyone heard of this feature and/or can give any hints where to find a technical documentation?

Hi, you could try to disable the bootstrapping at startup.
Maybe that helps and will bosst up the starting process a little
See: http://help.sap.com/saphelp_nw70/helpdata/EN/f6/6fff40e39ba854e10000000a1550b0/frameset.htm
Cheers

File Cache Issue

File Cache is eating up all my memory. I do run "purge" command to clean this up, but this is taking up all the memory vey often. This started happening after the Mavericks Upgrade.
One doubt I have on this usage is: Have a program that reads and writes files for every minute. Not sure, this is what is taking all the File Cache since I create and read those files too often.
Any suggestions to disable or limit the File Cache is welcome

Any ideas, how I can solve this.
I am trying to run the purge as a cron and purge is not working in cron
Donno why purge doesn't work in cron ?

Distributing wlclient.jar file - Licensing issues?

Hi,
I am working on creating an Eclipse plug-in which will be using wlclient.jar file. This is a open source project and is not used for commercial purpose. May I know if there are any licensing restrictions to distribute wlclient.jar as part of the free eclipse plugin project?
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push

.jar file reusablility issue in oracle forms

hello all
i am using oracle forms
{code}
Forms [32 Bit] Version 10.1.2.0.2 (Production)
Oracle Toolkit Version 10.1.2.0.2 (Production)
PL/SQL Version 10.1.0.4.2 (Production)
Oracle Procedure Builder V10.1.2.0.2 - Production
{code}
and using Database 10g
{code}
Oracle Database 10g Enterprise Edition Release 10.2.0.1.0 - Prod
PL/SQL Release 10.2.0.1.0 - Production
CORE    10.2.0.1.0      Production
TNS for 32-bit Windows: Version 10.2.0.1.0 - Production
NLSRTL Version 10.2.0.1.0 - Production
{code}
i am developing an application in oracle forms that sends message through GSM mobile when any transaction is commited.
i wrote a class in java , made .jar file , edited default.env file CLASSPATH = "my .jar file"
everything is working fine when i am trying the code in NETBEANS IDE, it sends messages again and over again with no delay..
PROBLEM:
the problem is that when i try to send message from oracle forms using that JAR file , it sends message for only single time , after that it neither shows me any error nor sends the message,
(1) can it be problem of closing COM port for reusablity.
(2) any other way to reuse the jar file.
(3) should i program to closo the used port. (but java program is working very well in NETBEANS IDE).
please suggest me what should i do to reuse .jar file again and over again.
thanks

thanks for your reply.
sorry if forgot to mention that how i am using this java code.
yes! i am using that java code using Java Importer in oracle forms 10g.
importing that jar file i used PL/SQL code to use the static public veriables in oracle forms
Procedure Send_Message(
    Cel_N In Varchar2
Is
Ora_Obj Ora_Java.Jobject;
Com_P    Varchar2(10);
Cent_No Varchar2(100);
Send_Sms Number;
Mesg     Varchar2(200);
Begin
Ora_Obj := Smsclient.New(1);
Smsclient.Setcomportname(Com_P);
Smsclient.Setmsgcenternum(Cent_No);
Send_Sms:= Smsclient.Sendmessage(Ora_Obj,Cel_N,Mesg);
Exception
When Ora_Java.Java_Error Then
Message(Ora_Java.Last_Error);
When Others Then
Message(Sqlerrm);
End;
this Smsclient.Sendmessage Class is working very well in both plateforms in NETBEANS IDE and oracle forms but the difference is in this class that
in NETBEANS IDE (when i run this class using F6 ) it works every time with no delay
but when i use this same class in pl/sql code through oracle forms it works only for one time.
COM ports and GSM modem is working property but why .jar file works for once.. and when i restart OC4J & oracle form at run time then it works for only once , meanse after starting OC4J i am able to send message through mobile for one time, means .jar file works only once, why not every time i call the class through oracle form..
what should i check .. please..
thanks

Jar File caching in temp directory problem

Hello,
I have a problem where the java plugin is caching jar_cache9999.jar (where 9999 is any number 0-9) files in the temp directory. I have tried following the directions for disk caching in the documentation, but these files are always created, never destroyed.
I was wondering:
1. Is there a simple setting that I could set that should resolve this problem? (un-setting "cache jars in memory" wouldn't seem to solve the problem as I would think that would only force the browser to use the same jar if it had already been loaded)
2. Has this problem been corrected in later releases of the java plugin? I am using the jre1.2.2. When I looked at the problem here in the forums, the bug that was listed was listed as fixed.
Thanks,
Dan Hughes

Hi,
Java Plug-in has supported disk caching in previous versions by using the same cache the browser uses for all other web documents. This works for casual applet usage, but larger applets can often get flushed from the cache to make room for other documents since the browser has no knowledge that an applet file might be needed in the future. The result is that this caching strategy fails where is needed most in large business applets.
From 1.3. the new feature is activated by including the new "cache_option" , "cache_archive" and "cache_version" values in the EMBED/OBJECT tag that specifies the use of Java Plug-in as below:
<OBJECT ....>
     <PARAM NAME="archive" VALUE="...">
     <PARAM NAME="cache_option" VALUE="...">
     <PARAM NAME="cache_archive" VALUE="...">
     <PARAM NAME="cache_version" VALUE="...">
</OBJECT>
or
<EMBED ....
     archive="..."
     cache_option="..."
     cache_archive="..."
     cache_version="...">
For detail description please go through the following URL:
http://java.sun.com/products/plugin/1.3/docs/appletcaching.html
Hope this will help you.
Anil.
Developer Technical Support
Sun Microsystems,
http://www.sun.com/developers/products

File Caching Issue

I am trying to debug an issue I am having in a custom scheduled task. I am using the tcEmailNotifcationUtil and want to see some trace. I have added an entry in the logging.xml file for the OIM server, which I assume is the correct place. However, whenever I restart the OIM server for these changes to take effect the file is overwritten and my changes are lost. Any idea on what could be causing this?
Pete

Which app server are you using ..?
For email notifications loggers , you need turn Xellerate.Request=DEBUG
Thanks
Suren

Image File Caching Issue\CF6 vs CF7

Why doesn't this work in CFMX7, but it works in CFMX6?
<img
src="<cfoutput>#request.testImage#</cfoutput>" alt=""
border="0">
It seems the src attribute for img needs to have the file
name in it somewhere.
Problem is it doesn't want to grab the latest image from the
file location, it seems to keep using the one that is cached while
in an instance of the browser prior to refreshing the page or
closing the broswer and coming back in. In CF6 the latest image is
grabbed showing the newly created image from the chart tag. In CF7
an X is displayed. Here is the code:
<cfset thisPath=ExpandPath("../")>
<cfset serverDirectory=GetDirectoryFromPath(thisPath)>
<cfchart format="png" chartheight="150" chartwidth="500"
showxgridlines="yes" showygridlines="yes" gridlines="#GL#"
seriesplacement="cluster" databackgroundcolor="##DDDDDD"
showborder="no" fontsize="10" fontbold="no" fontitalic="no"
show3d="yes" xoffset=".01" yoffset=".01" rotated="no"
sortxaxis="yes" showlegend="yes" showmarkers="no"
pieslicestyle="sliced" scalefrom="0" scaleto="#rangeto#"
name="myChart">
<cfchartseries type="bar" query="Appcount1"
itemcolumn="app" valuecolumn="ct" serieslabel="Tier 1"
Seriescolor="red">
<cfchartseries type="bar" query="Appcount2"
itemcolumn="app" valuecolumn="ct" serieslabel="Tier 2"
Seriescolor="green">
<cfchartseries type="bar" query="Appcount3"
itemcolumn="app" valuecolumn="ct" serieslabel="Tier 3"
Seriescolor="blue">
</cfchart>

<cfset request.chartImage =
"#serverDirectory#IRIS\images\chartImage.png">
<cfif FileExists("#request.chartImage#") is "Yes">
<cffile action="DELETE" charset="ISO-8859-1"
file="#request.chartImage#">
</cfif>
<cffile action="WRITE" charset="ISO-8859-1"
file="#request.chartImage#" output="#myChart#">

<p align="center"><img
src="<cfoutput>#request.chartImage#</cfoutput>" alt=""
border="0"></p>
The below works in both CF6 and CF7, but the latest image
isn't grabbed that is generated from the cfchart tag.
<p align="center"><img
src="<cfoutput>#request.images#</cfoutput>chartImage.png"
alt="" border="0"></p>

Instead of importing the TIF file back into your FCP project, try just making a still frame (Shift n) of the same frame and use that in FCP. Use the exported TIF for your DVD menu. Note that when you make a freeze frame, any filters that had been applied to the clip will not be applied to the freeze frame. To remedy that, copy the clip, then right-click on the freeze frame and choose Paste Attributes / Filters.
-DH

Jpg file caching issue. Optimization needed or poor settings?

'''- Step Naught''' - Boot Windows XP Pro SP3, on q6600 / 4Gb PC with /3G. Run Mozilla 3.6.10 and open two or three tabs to typical page: Google, TechDirt, Firefox Support.
'''- Step 1''' - Open a 4th tab, and load URL a containing a large jpg image. E.G., like one of the NASA .jpg files the from Hubble telescope page. Pick a hi-res image (> 72Kb). Often a large image triggers the zoom cursor to appear. This was my starting state.
'''- Step B''' - Surf that tab (with the .jpg) to a completely new domain, say, mozilla.com.
'''- Step III'' - Reload the previous page (with the .jpg). I don't recall here if I clicked the back button, or entered the page via its table of contents link.
'''- Step Last:''' Right-click to get image properties (sorry Macies), choose Save Image As, name and Save the file as directed.
'''- Result: ''' The image reloads via http: I sure would like the image to load from cache. Is this possible now? If so, what's the feature called? If it's not possible, this sounds like an easy optimization to make, albeit, low priority. What's the word?

Jey, we just installed:
Sun Java(tm) System Messaging Server 6.2 (built Dec 2 2004)
libimta.so 6.2 (built 00:34:23, Dec 2 2004)
SunOS urano1 5.9 Generic_118558-09 sun4u sparc SUNW,Ultra-4
And have the same problem with attached files: .doc,.xls,.ppt.
We have configured:
local.service.http.gzip.dynamic = 0
And IE tries to open a new window but close it rapidly. While presing CTRL the window open correctly.
The version installed previously did not have this problem:
Sun Java(tm) System Messaging Server 6.1 HotFix 0.02 (built Aug 25 2004)
libimta.so 6.1 HotFix 0.02 (built 17:03:42, Aug 25 2004)
SunOS urano 5.9 Generic_118559-10 i86pc i386 i86pc
Is there any parameter to change and correct this problem?
Thanks

External jar file deployment issue

Dear Experts,
I have one external jar : tc_sec_https.jar to be used in my dc.
Hence I have created an external library dc and included this jar in the library . I have also created one dc of type j2ee server component where I have used the public parts of the external library dc at build time.Finally I have deployed the j2ee type dc.
But when I log into visual admin I dont find the jars deployed on the server.
I have followed all the steps of the tutorial :
" External Library Deployment and Usage in SAP NWDS" by Saurabh Agarwal.
Could u please guide why I am not able to find the jar on the server while I log through visual admin ??
Regards,
Mamai.

Why do you deploy jar which is already on the server?
\usr\sap\<SID>\JC<INSTANCE_NUMBER>\j2ee\cluster\server0\bin\ext\security.class\tc_sec_https.jar
Just set reference to the library in your application-j2ee-engine.xml:
<reference-target target-type="library" provider-name="sap.com">security.class</reference-target>

Multiple repeat downloads of applet jar file

We have an applet that is downloaded from a Weblogic server. The applet is packaged as a jar file. Some of the testers have been complaining that the applet is extremely slow to start up.
The applet start-up involves three phases. In a first phase, it fetches data from the server. This phase seems to execute in pretty much constant time. During the second and third phases, it constructs a UI using Swing objects. The UI includes some JPEG files, which are extracted from the applet's own jar file.
Testers report that the slow part of start-up is actually the UI setup. This should theoretically not be network-bound at all. But packet tracing reveals that during this phase, there's a large amount of network traffic going on. It turns out that there are multiple GET requests for the applet jar file being issued. Typically, 29 requests are issued in all; just for reference, the applet is required to extract 28 images from its jar file, so it looks as if the additional requests correspond to image requests.
One further detail: this does not occur where there is a fast connection to the server. In these cases, the applet is downloaded once. It looks as if the problem only occurs on slower network connections, and the speculation here is that the applet jar is somehow being downloaded only partially, so that requests for images somehow trigger a re-request of the jar file.
Has anyone seen anything similar and, more to the point, is there a fix or workaround?
Technical details: Internet Explorer 5.5 or 6.0, JRE version 1.4.2_01 Java HotSpot(TM) Client VM (on the client), WebLogic 8.1 (on the server)
Thanks in advance for any help.

Ok.
I have been trying hard and found the solution. One of the ablove posting says that it works under java 1.4.1 plug-in. That's infact absolutely true. It also says that how to run client using JRE 1.4.2 or higher. That can be solved two. This is definitely a bug with the 1.4.2 plug-in.
Follow this procedure that will solve the mystry.
----------------------start ---------------------------------
Problem
Download of applet is very slow
Why?
This was happening because of the repeated download of the applet jars by the applet plug in controller. It is quite clear that the Java 1.4.2 plug in controller has a bug that causes the plug in to download same jar files multiple times irrespective of Jar cache in the client side (configurable from client side using the Java plug in control panel) is enabled or disabled. Therefore, we have moved from 1.4.2 plug in to 1.4.1 (controlled from our client (JSP) code) that works fine.
What the client (applet client) should do?
You must do the following in the client side in order to avoid the long download time for applet when running from a browser. We have also found that the browser actually do not matter in slow applet downloads. It is only the plug in that does control the applet download.
Irrespective of what JVM you have already installed (or not yet installed) please do the following:
1. Download the JRE 1.4.2 from http://java.sun.com/products/archive/index.html
-At the time of its installation if it shows that the "JRE is already installed do you uninstall it?" Go ahead and uninstall the JRE 1.4.2. After the un-installation again install the JRE 1.4.2
-If it does not have the JRE 1.4.2 already installed, then you will see any warning window and you will be able to install the 1.4.2 JRE successfully.
2. Now, go to the same link and install JRE 1.4.1.
-If this JRE already installed, uninstall first like the step 1 above. then reinstall it.
3. Now, after successful installation of the JRE 1.4.1, open the Plug-In control panel.
-You will find the list of control panel(s) in the Start->Control Panel window. Use the control panel that shows the version number 1.4.1. If no version number shown then use the one that do not show any version number at its end.
4. Do the following on the Plug-In control panel.
-Verify if this is the 1.4.1 plug in control panel? Go to the "About" tab to see if it shows 1.4.1.
If it does not show the 1.4.1 (or 1.4.1_x) then plug in was not installed correctly. Reinstall the 1.4.1 JRE following the step in no-2
-Go to "Basic" tab and select "Show console" radio button.
-Go to "Advanced" tab and from the drop down select "JRE ...1.4.2" from the "Java Runtime Environment" drop down box.
-Go to "Browser" tab and select all that in the "Settings" box applicable for browsers.
-Go to "Cache" select "Enable Caching" if it is not selected currently. Select "Unlimited" from "Size" options.
Now hit "Apply" button at the bottom and close the control panel using the 'X'.
5. Restart your Windows machine.
6. You are ready to run the applet from any of the browser (IE, NS, etc.)
--------------------------end------------------------------

JAR File Caching Issues

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