Strange caching problem

Dear Community,
I have a problem with deployment of WebDynpro applications. These contain a number of static files (stored under src/mimes/Components/...) which are displayed in my application.
Whenever I change those static (not generated by WD) files and redeploy the app, the changes are not visible. I tried disabling the IE cache with the Microsoft Developer Toolbar but the content sent is still the old file - the changes are not visible.
Does anyone have a clue on how to make those changes visible and where to flush any caches that hold these files?
I found out about cache expiration of WD content, but this does not affect files such as html.
Thanks for you help!
Kind regards,
Christian

Hi folks,
thanks for the answers, but unfortunately this ain't the solution. I'm using IE with Developer Toolbar, so I can erase my browsers cache on a click and view all sources - and updating my WD app doesn't influence the caching behaviour.
Has someone made experiences with setting parameters in Visual Administrator? There's a bunch of properties to make WD expire after x seconds - maybe there is one for mime content?
Thanks,
Christian<i></i>
See SAP Note Number: 589444
https://www.sdn.sap.com/irj/servlet/prt/portal/prtroot/com.sap.km.cm.highlightedcontent?documenturi=%2foss_notes%2fsdn_oss_bc_bsp%2f%7eform%2fhandler%7b5f4150503d3030323030363832353030303030303031393732265f4556454e543d444953504c4159265f4e4e554d3d353839343434%7d
MIME objects are buffered in the server cache of the Web ApplicationServer. When you import MIME objects, these are not removed from the cache. Consequently, the old versions are still displayed.
Message was edited by:
Christian Henn

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Caching problem w/ primary-foreign key mapping

I have seen this a couple of times now. It is not consistent enough to
create a simple reproducible test case, so I will have to describe it to you
with an example and hope you can track it down. It only occurs when caching
is enabled.
Here are the classes:
class C1 { int id; C2 c2; }
class C2 { int id; C1 c1; }
Each class uses application identity using static nested Id classes: C1.Id
and C2.Id. What is unusual is that the same value is used for both
instances:
int id = nextId();
C1 c1 = new C1(id);
C2 c2 = new C2(id);
c1.c2 = c2;
c2.c1 = c1;
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Although the integer values are the same, the oids are unique because each
class defines its own unique oid class.
Here is the schema and mapping (this works with caching disabled but fails
with caching enabled):
table t1: column id integer, column revision integer, primary key (id)
table t2: column id integer, column revision integer, primary key (id)
<jdo>
<package name="test">
<class name="C1" objectid-class="C1$Id">
<extension vendor-name="kodo" key="jdbc-class-map" value="base">
<extension vendor-name="kodo" key="table" value="t1"/>
</extension>
<extension vendor-name="kodo" key="jdbc-version-ind"
value="version-number">
<extension vendor-name="kodo" key="column" value="revision"/>
</extension>
<field name="id" primary-key="true">
<extension vendor-name="kodo" key="jdbc-field-map" value="value">
<extension vendor-name="kodo" key="column" value="id"/>
</extension>
</field>
<field name="c2">
<extension vendor-name="kodo" key="jdbc-field-map" value="one-one">
<extension vendor-name="kodo" key="column.id" value="id"/>
</extension>
</field>
</class>
<class name="C2" objectid-class="C2$Id">
<extension vendor-name="kodo" key="jdbc-class-map" value="base">
<extension vendor-name="kodo" key="table" value="t2"/>
</extension>
<extension vendor-name="kodo" key="jdbc-version-ind"
value="version-number">
<extension vendor-name="kodo" key="column" value="revision"/>
</extension>
<field name="id" primary-key="true">
<extension vendor-name="kodo" key="jdbc-field-map" value="value">
<extension vendor-name="kodo" key="column" value="id"/>
</extension>
</field>
<field name="c1">
<extension vendor-name="kodo" key="dependent" value="true"/>
<extension vendor-name="kodo" key="inverse-owner" value="c2"/>
<extension vendor-name="kodo" key="jdbc-field-map" value="one-one">
<extension vendor-name="kodo" key="table" value="t1"/>
<extension vendor-name="kodo" key="ref-column.id" value="id"/>
<extension vendor-name="kodo" key="column.id" value="id"/>
</extension>
</field>
</class>
</package>
</jdo>
Because the ids are known to be the same, the primary key values are also
used as foreign key values. Accessing C2.c1 is always non-null when caching
is disabled. With caching is enabled C2.c1 is usually non-null but sometimes
null. When it is null we get warnings about dangling references to deleted
instances with id values of 0 and other similar warnings.
The workaround is to add a redundant column with the same value. For some
reason this works around the caching problem (this is unnecessary with
caching disabled):
table t1: column id integer, column id2 integer, column revision integer,
primary key (id), unique index (id2)
table t2: column id integer, column revision integer, primary key (id)
<jdo>
<package name="test">
<class name="C1" objectid-class="C1$Id">
<extension vendor-name="kodo" key="jdbc-class-map" value="base">
<extension vendor-name="kodo" key="table" value="t1"/>
</extension>
<extension vendor-name="kodo" key="jdbc-version-ind"
value="version-number">
<extension vendor-name="kodo" key="column" value="revision"/>
</extension>
<field name="id" primary-key="true">
<extension vendor-name="kodo" key="jdbc-field-map" value="value">
<extension vendor-name="kodo" key="column" value="id"/>
</extension>
</field>
<field name="c2">
<extension vendor-name="kodo" key="jdbc-field-map" value="one-one">
<extension vendor-name="kodo" key="column.id" value="id2"/>
</extension>
</field>
</class>
<class name="C2" objectid-class="C2$Id">
<extension vendor-name="kodo" key="jdbc-class-map" value="base">
<extension vendor-name="kodo" key="table" value="t2"/>
</extension>
<extension vendor-name="kodo" key="jdbc-version-ind"
value="version-number">
<extension vendor-name="kodo" key="column" value="revision"/>
</extension>
<field name="id" primary-key="true">
<extension vendor-name="kodo" key="jdbc-field-map" value="value">
<extension vendor-name="kodo" key="column" value="id"/>
</extension>
</field>
<field name="c1">
<extension vendor-name="kodo" key="dependent" value="true"/>
<extension vendor-name="kodo" key="inverse-owner" value="c2"/>
<extension vendor-name="kodo" key="jdbc-field-map" value="one-one">
<extension vendor-name="kodo" key="table" value="t1"/>
<extension vendor-name="kodo" key="ref-column.id" value="id2"/>
<extension vendor-name="kodo" key="column.id" value="id"/>
</extension>
</field>
</class>
</package>
</jdo>
Needless to say, the extra column adds a lot of overhead, including the
addition of a second unique index, for no value other than working around
the caching defect.

Tom-
The first thing that I think of whenever I see a problem like this is
that the equals() and hashCode() methods of your application identity
classes are not correct. Can you check them to ensure that they are
written in accordance to the guidelines at:
http://docs.solarmetric.com/manual.html#jdo_overview_pc_identity_application
If that doesn't help address the problem, can you post the code for your
application identity classes so we can double-check, and we will try to
determine what might be causing the problem.
In article <[email protected]>, Tom Landon wrote:
I have seen this a couple of times now. It is not consistent enough to
create a simple reproducible test case, so I will have to describe it to you
with an example and hope you can track it down. It only occurs when caching
is enabled.
Here are the classes:
class C1 { int id; C2 c2; }
class C2 { int id; C1 c1; }
Each class uses application identity using static nested Id classes: C1.Id
and C2.Id. What is unusual is that the same value is used for both
instances:
int id = nextId();
C1 c1 = new C1(id);
C2 c2 = new C2(id);
c1.c2 = c2;
c2.c1 = c1;
This all works fine using optimistic transactions with caching disabled.
Although the integer values are the same, the oids are unique because each
class defines its own unique oid class.
Here is the schema and mapping (this works with caching disabled but fails
with caching enabled):
table t1: column id integer, column revision integer, primary key (id)
table t2: column id integer, column revision integer, primary key (id)
<jdo>
<package name="test">
<class name="C1" objectid-class="C1$Id">
<extension vendor-name="kodo" key="jdbc-class-map" value="base">
<extension vendor-name="kodo" key="table" value="t1"/>
</extension>
<extension vendor-name="kodo" key="jdbc-version-ind"
value="version-number">
<extension vendor-name="kodo" key="column" value="revision"/>
</extension>
<field name="id" primary-key="true">
<extension vendor-name="kodo" key="jdbc-field-map" value="value">
<extension vendor-name="kodo" key="column" value="id"/>
</extension>
</field>
<field name="c2">
<extension vendor-name="kodo" key="jdbc-field-map" value="one-one">
<extension vendor-name="kodo" key="column.id" value="id"/>
</extension>
</field>
</class>
<class name="C2" objectid-class="C2$Id">
<extension vendor-name="kodo" key="jdbc-class-map" value="base">
<extension vendor-name="kodo" key="table" value="t2"/>
</extension>
<extension vendor-name="kodo" key="jdbc-version-ind"
value="version-number">
<extension vendor-name="kodo" key="column" value="revision"/>
</extension>
<field name="id" primary-key="true">
<extension vendor-name="kodo" key="jdbc-field-map" value="value">
<extension vendor-name="kodo" key="column" value="id"/>
</extension>
</field>
<field name="c1">
<extension vendor-name="kodo" key="dependent" value="true"/>
<extension vendor-name="kodo" key="inverse-owner" value="c2"/>
<extension vendor-name="kodo" key="jdbc-field-map" value="one-one">
<extension vendor-name="kodo" key="table" value="t1"/>
<extension vendor-name="kodo" key="ref-column.id" value="id"/>
<extension vendor-name="kodo" key="column.id" value="id"/>
</extension>
</field>
</class>
</package>
</jdo>
Because the ids are known to be the same, the primary key values are also
used as foreign key values. Accessing C2.c1 is always non-null when caching
is disabled. With caching is enabled C2.c1 is usually non-null but sometimes
null. When it is null we get warnings about dangling references to deleted
instances with id values of 0 and other similar warnings.
The workaround is to add a redundant column with the same value. For some
reason this works around the caching problem (this is unnecessary with
caching disabled):
table t1: column id integer, column id2 integer, column revision integer,
primary key (id), unique index (id2)
table t2: column id integer, column revision integer, primary key (id)
<jdo>
<package name="test">
<class name="C1" objectid-class="C1$Id">
<extension vendor-name="kodo" key="jdbc-class-map" value="base">
<extension vendor-name="kodo" key="table" value="t1"/>
</extension>
<extension vendor-name="kodo" key="jdbc-version-ind"
value="version-number">
<extension vendor-name="kodo" key="column" value="revision"/>
</extension>
<field name="id" primary-key="true">
<extension vendor-name="kodo" key="jdbc-field-map" value="value">
<extension vendor-name="kodo" key="column" value="id"/>
</extension>
</field>
<field name="c2">
<extension vendor-name="kodo" key="jdbc-field-map" value="one-one">
<extension vendor-name="kodo" key="column.id" value="id2"/>
</extension>
</field>
</class>
<class name="C2" objectid-class="C2$Id">
<extension vendor-name="kodo" key="jdbc-class-map" value="base">
<extension vendor-name="kodo" key="table" value="t2"/>
</extension>
<extension vendor-name="kodo" key="jdbc-version-ind"
value="version-number">
<extension vendor-name="kodo" key="column" value="revision"/>
</extension>
<field name="id" primary-key="true">
<extension vendor-name="kodo" key="jdbc-field-map" value="value">
<extension vendor-name="kodo" key="column" value="id"/>
</extension>
</field>
<field name="c1">
<extension vendor-name="kodo" key="dependent" value="true"/>
<extension vendor-name="kodo" key="inverse-owner" value="c2"/>
<extension vendor-name="kodo" key="jdbc-field-map" value="one-one">
<extension vendor-name="kodo" key="table" value="t1"/>
<extension vendor-name="kodo" key="ref-column.id" value="id2"/>
<extension vendor-name="kodo" key="column.id" value="id"/>
</extension>
</field>
</class>
</package>
</jdo>
Needless to say, the extra column adds a lot of overhead, including the
addition of a second unique index, for no value other than working around
the caching defect.
Marc Prud'hommeaux [email protected]
SolarMetric Inc. http://www.solarmetric.com

Strange caching error in exporting a report to csv (AppEx v2.0)

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I am facing a caching problem in the Web-Application that I've developed us

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Dear Adobe,
The 5.0.1.23 update for Bridge CS6 does NOT fix the problem of constantly re-caching layered TIF files.
I originaly reported the problem here on May 16, 2012.
http://forums.adobe.com/thread/1007560
At that time I also submitted a bug report via photoshop.com, and received an e-mail response from Adobe support confirming the problem had been replicated in their lab and promising a fix in the next update.
I've since tracked several other reports of this bug and related cache problems.
I assume that, at best, we will have to wait another 6 months or more for the next update. How can I assure this bug will be addressed?

redcrown on guard wrote:
The 5.0.1.23 update for Bridge CS6 does NOT fix the problem of constantly re-caching layered TIF files.
At that time I also submitted a bug report via photoshop.com, and received an e-mail response from Adobe support confirming the problem had been replicated in their lab and promising a fix in the next update.
Thank you for this bit of information. Maybe it means I can stop the deactivations/uninstall/reinstall/reactivate cycle to try yet another solution. And hopefully, this will stop the re-caching problem with other than tif files.
regards
*S*

Caching problem in Chrome and Firefox

Hey folks,
I ran into a weird problem. I created a video player based on the Strobe Media Playback. I added a couple of plugins. This player is used to watch progressive download FLV files.
I ran into the following issue. I watch part of a video. I select another one. Then I select the previous one again. Only the cached portion of the first video is shown. The entire video will not be downloaded again from the server, but only the portion already cached on the client.
This problem is really bad in Chrome. When I restart FF, I can watch the entire video. Not in Chrome. The only way to solve this in Chrome is to clear the cache.
Any ideas?
The website is live, so you can test this yourselve. http://www.submergeproductions.com/videos.aspx
All help very welcome, because this is a major issue.
Follow up. I made a quick fix. I added a random number to the FLV url to force a redownload from the server, but this quite a dirty fix. I would rather have a restart/continuation of the download if the file was only partially downloaded.
Thanks,
Peter

Hi Silviu,
the reason why it works now is because I uploaded a modified version. I append "?<random number> to the URL. That prevents caching problems because the browser hasn't got the version cached. But I still report it as a bug.
Peter

Caching problem of servlet

Hi guys
We are facing this problem of caching within our project. The project aims to generate a html code to pick up some rich media ads details at random and displaying on the html file where the generated code is expected to be pasted. We developed two servlets, one which extracts the ads from the database randomly and then depanding on the ad type it calls the other servlet as src of an iframe, which in turn puts all code for displaying the rich media ads. The script which we are generating for the user to paste onto their pages is:
<script LANGUAGE="JAVASCRIPT" src="http://192.168.1.6:8080/advert_java/servlet/GetAdServlet?region=1&zone=1&type=nossi&cachevar=yes">
</script>First servlet (GetAdServlet) returns the javascript statements and thus is called using this generated code. Now cotents of the iframe are supplied by the second servlet ie richMediaServlet. This servlet is called like
iframeURL = fullHttpDir+"/servlet/RichMediaServlet?";
iframeURL += "bannerCode="+ RNBanner (BannerCode to be called);
out.println("document.write(\"<iframe src='" + iframeURL + "' height=" + hheight +" width="+ wwidth + " SCROLLING=no FRAMEBORDER=0 MARGINWIDTH=2 MARGINHEIGHT=2 onfocus='window.focus(); return iframeFocus()'>\");");
out.println("document.write(\"</iframe>\");");This richmediaServlet returns HTML into <iframe>. when richmediaservlet is called, a parameter 'bannerCode' is passed. then richmediaServlet fatches the banner from the database and displays the banner into the <iframe>.
Now the problem comes when we run the html file containing the script tag mentioned above, and refresh our page, ideally it should pick the ads randomly and pass it on to RichMediaServlet.
I also try debugging both servlets. I called the getadservlet from javascript mentioned above and put debugging info in both the servlets, now for every refresh we do on the html side, we are getting a different random bannercode in adservlet but in richmedia when we print the bannercode received in querystring it is taking an older value which was displayed some time back and keeps on doing this for quiet a long time, making it look like some caching problem of RichMediaServlet.
Instead when we tried to put the same html <script> code into another servlet's doGet, everything seems to be working fine.
i have also used the following code to prevent the caching on both the setvlets
long currentTime = System.currentTimeMillis();
response.setHeader("Cache-Control", "no-cache, must-revalidate");
response.setHeader("Pragma", "no-cache");
response.setDateHeader("Last-modified", currentTime);
response.setHeader("Expires", "Sat, 6 May 1995 12:00:00 GMT"); and following in the iframe's head tag before the iframe tag in the getAdServlet.
out.println("document.write('<head>');");
out.println("document.write('<meta http-equiv=\"Cache-Control\" content=\"no-cache,must-revalidate\">');");
out.println("document.write('<meta http-equiv=\"Pragma\" content=\"no-cache\">');");
out.println("document.write('<meta http-equiv=\"Last-modified\" content=\""+ currentTime + "\">');");
out.println("document.write('<meta http-equiv=\"expires\" content=\"Sat, 6 May 1995 12:00:00 GMT\">');");
out.println("document.write('</head>');");I request you all geeks to try and help me to your best. The project is at its final stages and in high urgency now.

i think the caching is being in the browser, with the iframe.
You should try passing a random param to the servlet in the iframe URL, something like:
var a = Math.random() * 10000000; //for example
out.println("document.write(\"<iframe src='" + iframeURL +"&rand="+a+"' height=" + hheight +" width="+ wwidth + " SCROLLING=no FRAMEBORDER=0 MARGINWIDTH=2 MARGINHEIGHT=2 onfocus='window.focus(); return iframeFocus()'>\");");
out.println("document.write(\"</iframe>\");");
...It should force the browser to ask for the servlet again
hope this helps...

Caching problem with Internet Explorer

Hi,
users of an ApEx application I'm working on are reporting that when they're deleting an uploaded file from one of the pages in the application (using Internet Explorer), the link to the file remains. This is however not an issue in FireFox, and after some research I found out that this is a caching problem in IE. It can be avoided by making IE check for newer versions of stored pages every time a page is visited, but it is clearly not an option to ask all our users to do this. I also learned that it can be fixed by randomizing the file URL every time the page is loaded, but I don't know how to randomize a URL, nor how to make it still point to the uploaded file.. Any help would be appreciated!
Thanks,
-Kjetil

Kjetil,
This problem is also there if you use Flash Charts with a drilldown. See this posting:
http://www.deneskubicek.blogspot.com/
It will also link you to a corresponding thread and to an example in my demo application.
The idea with a random number changing you link is the same I used in extending my
xml chart package.
Denes Kubicek
http://deneskubicek.blogspot.com/
http://www.opal-consulting.de/training
http://htmldb.oracle.com/pls/otn/f?p=31517:1
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ADF cache problem

Hello,
I'm developing a web application with an ADF tree accessing to a Content DB repository. When I deploy the application and navigate to the tree everything look fine. The problem occurs, when the content of the repository changed outside of the web application (e.g. a file will be deleted with Oracle drive), the tree doesn't display the changes. The only way to get the right state of the tree, clear the browser cache and reload the page again. In my opinion it looks like a caching problem. Putting the following meta information in the html header also failed!
<meta http-equiv="pragma" content="no-cache"/>
<meta http-equiv="expires" content="0"/>
<meta http-equiv="cache-control" content="no-cache"/>
Is there a possibility to disable the caching of such ADF components?
Hope you can help me!
Thanks,
Alex

This will probably help you: http://www.oracle.com/technology/products/ias/web_cache/afc/index.html
Regards,
Koen Verhulst

Strange email problem; it started only loading unread emails, but from 3 months ago. It is now loading new emails too, but no emails in the past month, read or unread. It's gmail, set up through the phone, I've restarted restored

Strange email problem; it started only loading unread emails, but from 3 months ago. It is now loading new emails too, but no emails in the past month, read or unread. It's gmail, set up through the phone, I've restarted restored and updated firmware, deleted the account, anything I could think of, but it's just not accurately downloading the most recent emails.

The answer is very simple: You were not the original owner of the phone. Target sold you a phone that had been returned. You can verify the date of the original sale here: Apple - Support - Check Your Service and Support Coverage. I suspect you will find that the warranty expiration date is not one year from the date that you bought it.

Strange caching problem

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