Jar downloading and Caching
I have an application that runs on a couple of servers. It's an assessment engine, so you take a test and for each question you download a new jar. Each jar is about 50-500k.
What i don't understand is that once the jars are cached, it still takes a significant amount of time to create the next question on our production environment. On staging and development it is much faster.
Granted the production environment receives production traffic and downloading the jars the first time should be slower, but once the jars are cached, why would it still take a lot of time. Is there still that much interactivity between the servers checking the jars on the server? It seems to me that once the jars are cached from the staging environments and production environments, they should behave practically the same.
Edited by: Brohonimo on Apr 16, 2010 10:54 AM
Here is something curious....
http://java.sun.com/j2se/1.4.2/docs/guide/plugin/developer_guide/applet_caching.html#algorithm
Known Issues
Caching of the .jar files specified in the manifest's Class-Path variable using Java Plug-in's cache is currently not supported.
The path specified in the cache_archive must be a relative URL to the applet's codebase. Full URLs are not supported in cache_archive.
* If you get the "java.io.IOException: Caching not supported for ..." exception, this is because Java Plug-in was unable to get the expiration and last-modification dates for a given JAR file from the web server. If the Java Plug-in cannot get this information, there is no point in caching since the JAR file will be downloaded every time it is used. Even with this exception, however, the applet should work fine. This exception is merely informative.
Now I specify only the one jar in the archive section of the html, which contains a jar with the classpath to all the necessary jars in the manifest and and Index file as well.
Each new jar shows up in the java cache and the console itself refers to the jar in the cache....
Reading certificates from 11 http://blahblahblah.jar | C:\Documents and Settings\dude\Application Data\Sun\Java\Deployment\cache\6.0\20\61ee19d4-232a6a61.idx
Is it possibly downloading the jar every time to the cache?
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network: Connecting https://200.253.113.26/forms/java/oracle/forms/webutil/clientInfo/GetClientInfo.class with cookie "JSESSIONID=4D4A8E49A46D4134112177FBACABE7B4"
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at sun.plugin2.applet.Applet2ClassLoader.getBytes(Unknown Source)
at sun.plugin2.applet.Applet2ClassLoader.access$000(Unknown Source)
at sun.plugin2.applet.Applet2ClassLoader$1.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
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network: Cache entry not found [url: https://200.253.113.26/forms/java/oracle/forms/webutil/clientInfo/GetClientInfo.class, version: null]
network: Connecting https://200.253.113.26/forms/java/oracle/forms/webutil/clientInfo/GetClientInfo.class with proxy=DIRECT
network: Connecting https://200.253.113.26/forms/java/oracle/forms/webutil/clientInfo/GetClientInfo.class with cookie "JSESSIONID=08AA4CF07F761424418619C068213911"
java.lang.ClassNotFoundException: oracle.forms.webutil.clientInfo.GetClientInfo
at sun.plugin2.applet.Applet2ClassLoader.findClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClassInternal(Unknown Source)
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Unknown Source)
at oracle.forms.handler.UICommon.instantiate(Unknown Source)
at oracle.forms.handler.UICommon.onCreate(Unknown Source)
at oracle.forms.handler.JavaContainer.onCreate(Unknown Source)
at oracle.forms.engine.Runform.onCreateHandler(Unknown Source)
at oracle.forms.engine.Runform.processMessage(Unknown Source)
at oracle.forms.engine.Runform.processSet(Unknown Source)
at oracle.forms.engine.Runform.onMessageReal(Unknown Source)
at oracle.forms.engine.Runform.onMessage(Unknown Source)
at oracle.forms.engine.Runform.sendInitialMessage(Unknown Source)
at oracle.forms.engine.Runform.startRunform(Unknown Source)
at oracle.forms.engine.Main.createRunform(Unknown Source)
at oracle.forms.engine.Main.start(Unknown Source)
at sun.plugin2.applet.Plugin2Manager$AppletExecutionRunnable.run(Unknown Source)
at java.lang.Thread.run(Unknown Source)
Caused by: java.io.IOException: open HTTP connection failed:https://200.253.113.26/forms/java/oracle/forms/webutil/clientInfo/GetClientInfo.class
at sun.plugin2.applet.Applet2ClassLoader.getBytes(Unknown Source)
at sun.plugin2.applet.Applet2ClassLoader.access$000(Unknown Source)
at sun.plugin2.applet.Applet2ClassLoader$1.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
... 20 more
network: Cache entry not found [url: https://200.253.113.26/lib/oracle/forms/webutil/file/FileFunctions.class, version: null]
network: Connecting https://200.253.113.26/lib/oracle/forms/webutil/file/FileFunctions.class with proxy=DIRECT
network: Cache entry not found [url: https://200.253.113.26/forms/java/oracle/forms/webutil/file/FileFunctions.class, version: null]
network: Connecting https://200.253.113.26/forms/java/oracle/forms/webutil/file/FileFunctions.class with proxy=DIRECT
network: Connecting https://200.253.113.26/forms/java/oracle/forms/webutil/file/FileFunctions.class with cookie "JSESSIONID=08AA4CF07F761424418619C068213911"
java.lang.ClassNotFoundException: oracle.forms.webutil.file.FileFunctions
at sun.plugin2.applet.Applet2ClassLoader.findClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClassInternal(Unknown Source)
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Unknown Source)
at oracle.forms.handler.UICommon.instantiate(Unknown Source)
at oracle.forms.handler.UICommon.onCreate(Unknown Source)
at oracle.forms.handler.JavaContainer.onCreate(Unknown Source)
at oracle.forms.engine.Runform.onCreateHandler(Unknown Source)
at oracle.forms.engine.Runform.processMessage(Unknown Source)
at oracle.forms.engine.Runform.processSet(Unknown Source)
at oracle.forms.engine.Runform.onMessageReal(Unknown Source)
at oracle.forms.engine.Runform.onMessage(Unknown Source)
at oracle.forms.engine.Runform.sendInitialMessage(Unknown Source)
at oracle.forms.engine.Runform.startRunform(Unknown Source)
at oracle.forms.engine.Main.createRunform(Unknown Source)
at oracle.forms.engine.Main.start(Unknown Source)
at sun.plugin2.applet.Plugin2Manager$AppletExecutionRunnable.run(Unknown Source)
at java.lang.Thread.run(Unknown Source)
Caused by: java.io.IOException: open HTTP connection failed:https://200.253.113.26/forms/java/oracle/forms/webutil/file/FileFunctions.class
at sun.plugin2.applet.Applet2ClassLoader.getBytes(Unknown Source)
at sun.plugin2.applet.Applet2ClassLoader.access$000(Unknown Source)
at sun.plugin2.applet.Applet2ClassLoader$1.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
... 20 more
network: Cache entry not found [url: https://200.253.113.26/lib/oracle/forms/webutil/host/Host.class, version: null]
network: Connecting https://200.253.113.26/lib/oracle/forms/webutil/host/Host.class with proxy=DIRECT
network: Cache entry not found [url: https://200.253.113.26/forms/java/oracle/forms/webutil/host/Host.class, version: null]
network: Connecting https://200.253.113.26/forms/java/oracle/forms/webutil/host/Host.class with proxy=DIRECT
network: Connecting https://200.253.113.26/forms/java/oracle/forms/webutil/host/Host.class with cookie "JSESSIONID=08AA4CF07F761424418619C068213911"
java.lang.ClassNotFoundException: oracle.forms.webutil.host.Host
at sun.plugin2.applet.Applet2ClassLoader.findClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClassInternal(Unknown Source)
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Unknown Source)
at oracle.forms.handler.UICommon.instantiate(Unknown Source)
at oracle.forms.handler.UICommon.onCreate(Unknown Source)
at oracle.forms.handler.JavaContainer.onCreate(Unknown Source)
at oracle.forms.engine.Runform.onCreateHandler(Unknown Source)
at oracle.forms.engine.Runform.processMessage(Unknown Source)
at oracle.forms.engine.Runform.processSet(Unknown Source)
at oracle.forms.engine.Runform.onMessageReal(Unknown Source)
at oracle.forms.engine.Runform.onMessage(Unknown Source)
at oracle.forms.engine.Runform.sendInitialMessage(Unknown Source)
at oracle.forms.engine.Runform.startRunform(Unknown Source)
at oracle.forms.engine.Main.createRunform(Unknown Source)
at oracle.forms.engine.Main.start(Unknown Source)
at sun.plugin2.applet.Plugin2Manager$AppletExecutionRunnable.run(Unknown Source)
at java.lang.Thread.run(Unknown Source)
Caused by: java.io.IOException: open HTTP connection failed:https://200.253.113.26/forms/java/oracle/forms/webutil/host/Host.class
at sun.plugin2.applet.Applet2ClassLoader.getBytes(Unknown Source)
at sun.plugin2.applet.Applet2ClassLoader.access$000(Unknown Source)
at sun.plugin2.applet.Applet2ClassLoader$1.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
... 20 more
network: Cache entry not found [url: https://200.253.113.26/lib/oracle/forms/webutil/session/SessionFunctions.class, version: null]
network: Connecting https://200.253.113.26/lib/oracle/forms/webutil/session/SessionFunctions.class with proxy=DIRECT
network: Cache entry not found [url: https://200.253.113.26/forms/java/oracle/forms/webutil/session/SessionFunctions.class, version: null]
network: Connecting https://200.253.113.26/forms/java/oracle/forms/webutil/session/SessionFunctions.class with proxy=DIRECT
network: Connecting https://200.253.113.26/forms/java/oracle/forms/webutil/session/SessionFunctions.class with cookie "JSESSIONID=08AA4CF07F761424418619C068213911"
java.lang.ClassNotFoundException: oracle.forms.webutil.session.SessionFunctions
at sun.plugin2.applet.Applet2ClassLoader.findClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClassInternal(Unknown Source)
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Unknown Source)
at oracle.forms.handler.UICommon.instantiate(Unknown Source)
at oracle.forms.handler.UICommon.onCreate(Unknown Source)
at oracle.forms.handler.JavaContainer.onCreate(Unknown Source)
at oracle.forms.engine.Runform.onCreateHandler(Unknown Source)
at oracle.forms.engine.Runform.processMessage(Unknown Source)
at oracle.forms.engine.Runform.processSet(Unknown Source)
at oracle.forms.engine.Runform.onMessageReal(Unknown Source)
at oracle.forms.engine.Runform.onMessage(Unknown Source)
at oracle.forms.engine.Runform.sendInitialMessage(Unknown Source)
at oracle.forms.engine.Runform.startRunform(Unknown Source)
at oracle.forms.engine.Main.createRunform(Unknown Source)
at oracle.forms.engine.Main.start(Unknown Source)
at sun.plugin2.applet.Plugin2Manager$AppletExecutionRunnable.run(Unknown Source)
at java.lang.Thread.run(Unknown Source)
Caused by: java.io.IOException: open HTTP connection failed:https://200.253.113.26/forms/java/oracle/forms/webutil/session/SessionFunctions.class
at sun.plugin2.applet.Applet2ClassLoader.getBytes(Unknown Source)
at sun.plugin2.applet.Applet2ClassLoader.access$000(Unknown Source)
at sun.plugin2.applet.Applet2ClassLoader$1.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
... 20 more
network: Cache entry not found [url: https://200.253.113.26/lib/oracle/forms/webutil/fileTransfer/FileTransfer.class, version: null]
network: Connecting https://200.253.113.26/lib/oracle/forms/webutil/fileTransfer/FileTransfer.class with proxy=DIRECT
network: Cache entry not found [url: https://200.253.113.26/forms/java/oracle/forms/webutil/fileTransfer/FileTransfer.class, version: null]
network: Connecting https://200.253.113.26/forms/java/oracle/forms/webutil/fileTransfer/FileTransfer.class with proxy=DIRECT
network: Connecting https://200.253.113.26/forms/java/oracle/forms/webutil/fileTransfer/FileTransfer.class with cookie "JSESSIONID=08AA4CF07F761424418619C068213911"
java.lang.ClassNotFoundException: oracle.forms.webutil.fileTransfer.FileTransfer
at sun.plugin2.applet.Applet2ClassLoader.findClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClassInternal(Unknown Source)
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Unknown Source)
at oracle.forms.handler.UICommon.instantiate(Unknown Source)
at oracle.forms.handler.UICommon.onCreate(Unknown Source)
at oracle.forms.handler.JavaContainer.onCreate(Unknown Source)
at oracle.forms.engine.Runform.onCreateHandler(Unknown Source)
at oracle.forms.engine.Runform.processMessage(Unknown Source)
at oracle.forms.engine.Runform.processSet(Unknown Source)
at oracle.forms.engine.Runform.onMessageReal(Unknown Source)
at oracle.forms.engine.Runform.onMessage(Unknown Source)
at oracle.forms.engine.Runform.sendInitialMessage(Unknown Source)
at oracle.forms.engine.Runform.startRunform(Unknown Source)
at oracle.forms.engine.Main.createRunform(Unknown Source)
at oracle.forms.engine.Main.start(Unknown Source)
at sun.plugin2.applet.Plugin2Manager$AppletExecutionRunnable.run(Unknown Source)
at java.lang.Thread.run(Unknown Source)
Caused by: java.io.IOException: open HTTP connection failed:https://200.253.113.26/forms/java/oracle/forms/webutil/fileTransfer/FileTransfer.class
at sun.plugin2.applet.Applet2ClassLoader.getBytes(Unknown Source)
at sun.plugin2.applet.Applet2ClassLoader.access$000(Unknown Source)
at sun.plugin2.applet.Applet2ClassLoader$1.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
... 20 more
network: Cache entry not found [url: https://200.253.113.26/lib/oracle/forms/webutil/ole/OleFunctions.class, version: null]
network: Connecting https://200.253.113.26/lib/oracle/forms/webutil/ole/OleFunctions.class with proxy=DIRECT
network: Cache entry not found [url: https://200.253.113.26/forms/java/oracle/forms/webutil/ole/OleFunctions.class, version: null]
network: Connecting https://200.253.113.26/forms/java/oracle/forms/webutil/ole/OleFunctions.class with proxy=DIRECT
network: Connecting https://200.253.113.26/forms/java/oracle/forms/webutil/ole/OleFunctions.class with cookie "JSESSIONID=08AA4CF07F761424418619C068213911"
java.lang.ClassNotFoundException: oracle.forms.webutil.ole.OleFunctions
at sun.plugin2.applet.Applet2ClassLoader.findClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClassInternal(Unknown Source)
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Unknown Source)
at oracle.forms.handler.UICommon.instantiate(Unknown Source)
at oracle.forms.handler.UICommon.onCreate(Unknown Source)
at oracle.forms.handler.JavaContainer.onCreate(Unknown Source)
at oracle.forms.engine.Runform.onCreateHandler(Unknown Source)
at oracle.forms.engine.Runform.processMessage(Unknown Source)
at oracle.forms.engine.Runform.processSet(Unknown Source)
at oracle.forms.engine.Runform.onMessageReal(Unknown Source)
at oracle.forms.engine.Runform.onMessage(Unknown Source)
at oracle.forms.engine.Runform.sendInitialMessage(Unknown Source)
at oracle.forms.engine.Runform.startRunform(Unknown Source)
at oracle.forms.engine.Main.createRunform(Unknown Source)
at oracle.forms.engine.Main.start(Unknown Source)
at sun.plugin2.applet.Plugin2Manager$AppletExecutionRunnable.run(Unknown Source)
at java.lang.Thread.run(Unknown Source)
Caused by: java.io.IOException: open HTTP connection failed:https://200.253.113.26/forms/java/oracle/forms/webutil/ole/OleFunctions.class
at sun.plugin2.applet.Applet2ClassLoader.getBytes(Unknown Source)
at sun.plugin2.applet.Applet2ClassLoader.access$000(Unknown Source)
at sun.plugin2.applet.Applet2ClassLoader$1.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
... 20 more
network: Cache entry not found [url: https://200.253.113.26/lib/oracle/forms/webutil/cApi/CApiFunctions.class, version: null]
network: Connecting https://200.253.113.26/lib/oracle/forms/webutil/cApi/CApiFunctions.class with proxy=DIRECT
network: Cache entry not found [url: https://200.253.113.26/forms/java/oracle/forms/webutil/cApi/CApiFunctions.class, version: null]
network: Connecting https://200.253.113.26/forms/java/oracle/forms/webutil/cApi/CApiFunctions.class with proxy=DIRECT
network: Connecting https://200.253.113.26/forms/java/oracle/forms/webutil/cApi/CApiFunctions.class with cookie "JSESSIONID=08AA4CF07F761424418619C068213911"
java.lang.ClassNotFoundException: oracle.forms.webutil.cApi.CApiFunctions
at sun.plugin2.applet.Applet2ClassLoader.findClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClassInternal(Unknown Source)
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Unknown Source)
at oracle.forms.handler.UICommon.instantiate(Unknown Source)
at oracle.forms.handler.UICommon.onCreate(Unknown Source)
at oracle.forms.handler.JavaContainer.onCreate(Unknown Source)
at oracle.forms.engine.Runform.onCreateHandler(Unknown Source)
at oracle.forms.engine.Runform.processMessage(Unknown Source)
at oracle.forms.engine.Runform.processSet(Unknown Source)
at oracle.forms.engine.Runform.onMessageReal(Unknown Source)
at oracle.forms.engine.Runform.onMessage(Unknown Source)
at oracle.forms.engine.Runform.sendInitialMessage(Unknown Source)
at oracle.forms.engine.Runform.startRunform(Unknown Source)
at oracle.forms.engine.Main.createRunform(Unknown Source)
at oracle.forms.engine.Main.start(Unknown Source)
at sun.plugin2.applet.Plugin2Manager$AppletExecutionRunnable.run(Unknown Source)
at java.lang.Thread.run(Unknown Source)
Caused by: java.io.IOException: open HTTP connection failed:https://200.253.113.26/forms/java/oracle/forms/webutil/cApi/CApiFunctions.class
at sun.plugin2.applet.Applet2ClassLoader.getBytes(Unknown Source)
at sun.plugin2.applet.Applet2ClassLoader.access$000(Unknown Source)
at sun.plugin2.applet.Applet2ClassLoader$1.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
... 20 more
network: Cache entry not found [url: https://200.253.113.26/lib/oracle/forms/webutil/browser/BrowserFunctions.class, version: null]
network: Connecting https://200.253.113.26/lib/oracle/forms/webutil/browser/BrowserFunctions.class with proxy=DIRECT
network: Cache entry not found [url: https://200.253.113.26/forms/java/oracle/forms/webutil/browser/BrowserFunctions.class, version: null]
network: Connecting https://200.253.113.26/forms/java/oracle/forms/webutil/browser/BrowserFunctions.class with proxy=DIRECT
network: Connecting https://200.253.113.26/forms/java/oracle/forms/webutil/browser/BrowserFunctions.class with cookie "JSESSIONID=08AA4CF07F761424418619C068213911"
java.lang.ClassNotFoundException: oracle.forms.webutil.browser.BrowserFunctions
at sun.plugin2.applet.Applet2ClassLoader.findClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClassInternal(Unknown Source)
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Unknown Source)
at oracle.forms.handler.UICommon.instantiate(Unknown Source)
at oracle.forms.handler.UICommon.onCreate(Unknown Source)
at oracle.forms.handler.JavaContainer.onCreate(Unknown Source)
at oracle.forms.engine.Runform.onCreateHandler(Unknown Source)
at oracle.forms.engine.Runform.processMessage(Unknown Source)
at oracle.forms.engine.Runform.processSet(Unknown Source)
at oracle.forms.engine.Runform.onMessageReal(Unknown Source)
at oracle.forms.engine.Runform.onMessage(Unknown Source)
at oracle.forms.engine.Runform.sendInitialMessage(Unknown Source)
at oracle.forms.engine.Runform.startRunform(Unknown Source)
at oracle.forms.engine.Main.createRunform(Unknown Source)
at oracle.forms.engine.Main.start(Unknown Source)
at sun.plugin2.applet.Plugin2Manager$AppletExecutionRunnable.run(Unknown Source)
at java.lang.Thread.run(Unknown Source)
Caused by: java.io.IOException: open HTTP connection failed:https://200.253.113.26/forms/java/oracle/forms/webutil/browser/BrowserFunctions.class
at sun.plugin2.applet.Applet2ClassLoader.getBytes(Unknown Source)
at sun.plugin2.applet.Applet2ClassLoader.access$000(Unknown Source)
at sun.plugin2.applet.Applet2ClassLoader$1.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
... 20 more
network: Connecting https://200.253.113.26/forms/lservlet;jsessionid=08AA4CF07F761424418619C068213911 with proxy=DIRECT
network: Connecting https://200.253.113.26/forms/lservlet;jsessionid=08AA4CF07F761424418619C068213911 with cookie "JSESSIONID=08AA4CF07F761424418619C068213911"
network: Connecting https://200.253.113.26/forms/lservlet;jsessionid=08AA4CF07F761424418619C068213911 with proxy=DIRECT
network: Connecting https://200.253.113.26/forms/lservlet;jsessionid=08AA4CF07F761424418619C068213911 with cookie "JSESSIONID=08AA4CF07F761424418619C068213911"
basic: Applet started -
We had an application based on java applet. After every new deployment the version changes and it downloads the new jar on the client's PC. Out client has one server which has capability to push the required files on each configured client PC.
Proposal from client is to push the jar file and the index file to the user_profile folder of the user. The problem that I am facing is when java downloads the jars:
- It decrypts the jar
- The name of the jar is appended with some hex numbers.
- It creates the index
I wanted to know the details about all the above three items. Can I explode the jar file in the required format/create index and then push to client's user_profile folder.
We are still doing experiments in order to understand the concept of this hex numbers.Here is something curious....
http://java.sun.com/j2se/1.4.2/docs/guide/plugin/developer_guide/applet_caching.html#algorithm
Known Issues
Caching of the .jar files specified in the manifest's Class-Path variable using Java Plug-in's cache is currently not supported.
The path specified in the cache_archive must be a relative URL to the applet's codebase. Full URLs are not supported in cache_archive.
* If you get the "java.io.IOException: Caching not supported for ..." exception, this is because Java Plug-in was unable to get the expiration and last-modification dates for a given JAR file from the web server. If the Java Plug-in cannot get this information, there is no point in caching since the JAR file will be downloaded every time it is used. Even with this exception, however, the applet should work fine. This exception is merely informative.
Now I specify only the one jar in the archive section of the html, which contains a jar with the classpath to all the necessary jars in the manifest and and Index file as well.
Each new jar shows up in the java cache and the console itself refers to the jar in the cache....
Reading certificates from 11 http://blahblahblah.jar | C:\Documents and Settings\dude\Application Data\Sun\Java\Deployment\cache\6.0\20\61ee19d4-232a6a61.idx
Is it possibly downloading the jar every time to the cache? -
Validating XML offline: is a web-proxy and cache the solution?
Is implementing a web-proxy and cache, the solution to offline XML validation?
Our application uses XML to store data (local, and remote: it's up to user), but needs to work even when offline. This is a problem for the validated XML, since it's DTD may be located on a remote server. To complicate things, we would like to allow others to extend our application with data-formats (DTD's) of their own.
At the moment, the DTD is stored in the applications jar file, but this is going to be a problem. In the data files, the URL for it's DTD includes the jar file's system dependant path name. If data files are moved to a different system (where paths are different) this will no longer work. As you can guess, simply using relative URL's (using the data file or the even the Application jar as Base URL) will also cause problems.
Before concerning ourselves with offline editing, we ran into the problem of firewalls. This we could circumvent by setting Java's global HTTP proxy (thanks to http://www.javaworld.com/javaworld/javatips/jw-javatip42.html for the tip)
if (userNeedsProxy) {
System.getProperties().put ("proxySet", "true");
System.getProperties().put ("proxyHost", userProxyHost);
System.getProperties().put ("proxyPort", userProxyPort);
}Which appears to affect all URL.getStream() calls for http URL's, so works fine.
To get around the offline problem, I'm thinking of implementing my application as a 'proxy', and caching any downloaded DTDs locally. This cache could be seeded with our apps default DTD, and any extensions can take advantage of this as well. This solution has the benifit of not modifying the basic XML parsing routines or doing something undesirable, like just turning off validation (suggested on other forum threads). Would this involve creating a custom URLConnection object and or URLStreamHandler?
Any suggestions or comments are welcome, as I haven't started this, and I'm pretty sure it has been solved before. Does this sound feasable, or insane? :) Any experience shared is very appriciated!
Thanks in advance
...ChadHi ..
I am a computer science student .. I am reading alot about web caching
so i deside tht my graduate project must be a web caching application
but I don't know from where I must begin ... to study about creating that in java ..
can u help me plz ???
my e-mail : [email protected]
Ahmad -
I am a newbie to jnlp files and the related infrastructure. I have a question about jnlp files and caching. My scenario is the following, i have 2 machines with the same jnlp file names, the data inside of them is different. So when I connect to machine1, the data corresponds to the correct machine. When I connect to machine2, I still get the version for machine1. Where is this data cached? and how do i force a "refresh" or a new download of the jnlp file?
TIA,
RezaThe identity of a jnlp app is the complete href (including codebase) of the jnlp file (if there is one, or the complete href of the main jar if there is no href to the jnlp file.)
Because of this, regardless of the "title" of the application, two instances of the same application hosted on differant hosts (or in differant locations of the same host) are treated as two differant applications.
(RFE's exist to be able to provide a unique id to all resources, including jnlp file references, so the application or it's resources can be mirrored or moved from location to location)
On the other hand, shortcuts are created based on their "title" element, so switching to the same named application on a differant location should replace the shortcut with thte one based on that jnlp file.
From your question, it's a litle unclear what you are doing. When you "connect to machine2", exactly what are you doing ? , and waht version of javaws are you using ?
/Andy -
Lenovo U310: Clean Windows 7 Installation Guide (including Rapid Start and Caching)
Hi there,
this is the first time that I am writing such a guide/tutorial/whatever you may call it – there are probably better ones, but though not being a total computer noob, it took me almost one week to get this pretty (now again) little beast running again. So hopefully this helps some others to avoid such stupid downtimes.
A brief overview on what has happened to my original win 7 Home Premium:
As some may know, this laptop is very well usable as a “Hackintosh” called Macbook clone. So that’s what I did. It turned out to be nice, but I wanted to go back to Windows after a while, using a clean W7 Pro installation to start over. Actually an easy task, format all drives, install Windows, be happy. Just as I had been doing this for years. Unfortunately, it turned out to be a real challenge. First, I couldn’t “see” my drives during installation (and thus not install), then I got random errors during installation aborting it at different points and finally rapid start and caching didn’t work. Every time I tried to activate them (after Win installation), it crashed my PC. I even found an (official Lenovo!) guide stating to install W7 on the SSD, which worked, but sucks due to space limitations. Oh and another very nice thing: The SSD showed up during WIN installation (but not the classical hard drive) stating it was about 60 GB. So as you can see, I have had a lot of different tries and errors. Why I didn’t use Lenovo Easy Recover? As said before, I erased all partitions…
Before we start: If you have a good Windows running on the Laptop, do yourself a favor and disconnect the RAID 0 disks using the Intel Rapid Storage Application before(!!!) proceeding. It will make things much easier. And don’t forget to get all you data on an external drive or something.
Ok, now let’s start.
1.) Prepare a USB Stick with the following driver
http://downloadcenter.intel.com/Detail_Desc.aspx?DwnldID=21730 (choose f6flpy-x64.zip If you’re running a
64-bit system (standard nowadays), take f6flpy-x86.zip if it is a 32-bit Windows, just download and copy them
into the stick’s root directory) and plug this stick in one of the left side USB ports.
2.) You’ll need Win 7 on either a DVD (plus external drive, for sure) or (bootable) USB stick
3.) Connect your drive/stick (with W7) to the right side USB port.
4.) Switch the computer on, immediately hit FN and F2. That will open the BIOS.
5.) In the BIOS, navigate to the very right section (“save and exit”) and navigate the cursor to “load setup defaults”.
Hit enter to approve.
6.) After that, go to the “boot” tab and disable UEFI-boot.
7.) Next, go one more tab to the left and set the controller setting to RAID (NOT AHCI or Compatible!!!).
8.) Navigate the cursor down to “Intel Rapid Start” and hit enter. A submenu will pop up-
9.) Disable the first entry in that window, that will make the rest be disabled as well.
10.) Navigate to the very right tab, this time hit save and exit.
11.) The PC restarts.
12.) Immediately hit FN and F12 to open the boot selection menu. Select to boot from your W7 DVD drive or USB
stick.
13.) Click yourself through the whole process of installing Windows 7 until the page comes up where you will have
to select where to install it.
14.) Click on “load drivers” and after a few seconds your downloaded driver should be there. Click ok to use them.
Please do this step even if you can see your drives (SSD Disk 0, 32 GB and HDD Disk 1, 465(<-?) GB) as you
would expect them – otherwise you’re very likely to get an error during the install process.
15.) Now erase all partitions on both drives and select the HDD as the drive to install W7 to – NOT THE SSD!!!!!
Seriously, don’t choose the SSD.
16.) Windows will probably say that some extra partitions are necessary and so on, click ok and install Windows.
17.) After the installation has finished and you see your Desktop, I suggest you to proceed with the next steps in the
following order to see as early as possible if you are on the right way.
18.) Install the Chipset driver, restart.
19.) Install the Intel Rapid Storage “driver” and check the box where it asks to additionally install the control center.
Reboot.
20.) Go into BIOS (FN and F2) and enable Intel Rapid Start (the one you disabled in Step 8 and 9)
21.) Boot into Windows.
22.) Click on the Windows button, type cmd and right klick on the cmd.exe, select to run it as Admin.
23.) Now you’ll create a hibernation partition on the SSD. (which by now should be completely empty as we’ve
deleted all partitions in step 15)
24.) In the command prompt that we have just opened, type: (without quotas, for sure)
“diskpart” and hit the enter button
“list disk” and hit the enter button
Now you should see your ssd as disk 0 and your hdd as disk 1
If your ssd is disk 0 (that would be standard), write “select disk 0”, otherwise write: “select disk 1”, and hit the enter button.
Now write “create partition primary size=4096” and hit enter again. [if you have 4GB of ram, type 4096, if you have 8 GB of ram, use 8192]
Now write “detail disk” and hit enter to see the volume number behind the volume that we have just created (it is 4 GB or 8 respectively, should be easy to find), in my case that was “2”
Now type “select volume 2” if your 4 or 8 GB volume has number 2 as well, otherwise use the number you found out in step f. Hit enter.
Finally, type: “set id=84 override” and hit enter for one last time.
It should now say back that the id has been set successfully.
Exit the command prompt. (close)
25.) Reboot
26.) Install the Rapid Start driver. Reboot.
27.) Open the Intel Rapid Storage Application.
28.) Click on accelerate and approve the settings. Two RAID’s will be created. Reboot.
29.) Install the remaining drivers, have fun with Windows Update and that’s it!
Good luck to all of you… And hey Lenovo - wouldn't that have been your job after all these posts showing your costumers in trouble? Just my two cents...
If you want, you can now turn on UEFI-boot in BIOS.
PS: If, after installing all drivers, you happen to see one unknown device in your device manager – this one belongs to Lenovo Connect Software that came with your Laptop. (Updates FB, Email etc when PC is in sleep mode) If you install Lenovo Connect it’s going to be fine, however, I would not recommend it as it is said to use a lot of energy and cause some other problems. So just live with it, your PC is totally fine without it.
Kind regards from ShanghaiSeriously guys, I can't use my 3 days old laptop. Some help would be mostly appreciated. At this point, the network connection issue doesn't show up anymore, it's just a blank screen after reboot. I reinstall windows and do it all over again just to achieve the same result.
Now couple of things caught my attention: as I load the "6flpy-x64.zip" driver from step 14, I get a message saying I need to install signed drivers, because unsigned ones are likely to mess up the system.
Secondly, I could not find any Rapid Storage Technology drivers for Windows 7 (particularly for U310 model), so I use the Windows 8 ones (http://support.lenovo.com/en_US/downloads/detail.page?DocID=DS031455), which seems a silly thing, yet I know of no alternatives.
Could it be any of these issues to cause my problem? Or smth else? Please help! -
What is the diffrence between cookies and cache, is it safe to remove cache?
what is the difference between cookies and cache , is it safe to remove cache ? . I had cleaned cookies many times but I have not removed cache , does it goes on increasing day by day ? please let me know
Cookies are small files that contain information useful to a web site -- such as password, preferences, last date visited, etc. You may remove the cookies that you don't want adn since some of them are a privacy issue, many people remove them all.
Cache is just a collection of data downloaded to help display a web page. After you leave a site, much of the cache is left on your computer and is no longer needed. You can always remove the cache because it will be replaced as needed. -
My browser was very slow, so I cleared cookies and cache. When FF (4.0) restarted, it said it had installed colourful tabs (which I ALREADY HAD). I opened FF and typed in mmy first TE on my list ( I surf traffic exchanges). But I cannot do so on FF anymore. Only half my computer screen is from the TE or web page, and the bottom HALF of the screen is for History, etc. I cannot even see or access the Start menu or my open tabs at the bottom of the screen, unless I use Control and Escape.
I got the url from FF 4.0 , uninstalled the old version and reinstalled it. Same thing. I uninstalled it again, straight from my control panel (Windows Vista Home Premium), cleared cookies and cache again, fixed registry problems again, and restarted my computer. STILL same thing!
I tried to adjust settings, but it will not let me change what I need to. I cannot unclick that updates will be downloaded and installed automatically, and check that I want to be asked each time. I do not know if I can even SEE what was updated, to give you an idea if that could have caused this very nasty problem. Nasty, because until it is fixed, I will not be using FF.After following all the instructions given, I poked around safe websites as suggested. I am not sure why this step was needed, as websites functioned rather normally before I came here but I did it anyways and found that the websites still work the same as they did. I can still do everything I used to be able to do. I see no change in the function of the websites.
However, I still cannot resize, close, or move the browser window. I don't know if Netflix is a safe site or not (too many conflicting opinions on that one from the masses) so I don't know if the issue with the vanishing buttons is still there, but all the issues I had with the browser window itself is still there.
Even in safe mode the browsers three window control buttons on the top right refuse to let me use them and the window itself will refuse to be moved around.
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