Jar archive for applet?

My HTML for an applet reads:
<applet
     code=Go.class
archive="Go.jar"
width=120 height=120>
</applet>
Go.class is in Go.jar but when I try to run this applet I get an error message that reads:
load: class Go.class not found.
java.lang.ClassNotFoundException: Go.class
     at sun.applet.AppletClassLoader.findClass(Unknown Source)
     at sun.plugin.security.PluginClassLoader.findClass(Unknown Source)
     at java.lang.ClassLoader.loadClass(Unknown Source)
     at sun.applet.AppletClassLoader.loadClass(Unknown Source)
     at java.lang.ClassLoader.loadClass(Unknown Source)
     at sun.applet.AppletClassLoader.loadCode(Unknown Source)
     at sun.applet.AppletPanel.createApplet(Unknown Source)
     at sun.plugin.AppletViewer.createApplet(Unknown Source)
     at sun.applet.AppletPanel.runLoader(Unknown Source)
     at sun.applet.AppletPanel.run(Unknown Source)
     at java.lang.Thread.run(Unknown Source)
Caused by: java.io.FileNotFoundException: C:\Dave\Ethanol\Go\class.class (The system cannot find the path specified)
     at java.io.FileInputStream.open(Native Method)
     at java.io.FileInputStream.<init>(Unknown Source)
     at java.io.FileInputStream.<init>(Unknown Source)
     at sun.net.www.protocol.file.FileURLConnection.connect(Unknown Source)
     at sun.net.www.protocol.file.FileURLConnection.getInputStream(Unknown Source)
     at sun.applet.AppletClassLoader.getBytes(Unknown Source)
     at sun.applet.AppletClassLoader.access$100(Unknown Source)
     at sun.applet.AppletClassLoader$1.run(Unknown Source)
     at java.security.AccessController.doPrivileged(Native Method)
     ... 11 more
WHY OH WHY???

Similar Messages

How to use packages and jar files for applet?

Hi!
My applet takes a class say a.class.
Now this class depends on other classes that are packaged
in a directory and put separately.
I want to put this applet on the web.
So how do I manage the .class files in he package.
I have tried using jar file format.But I was not able to get it working.
Can someone please help me?
Thanks

Use Archive instead of codebase:
<APPLET CODE="MyApplet.class" ARCHIVE="MyApplet.jar" WIDTH=400 HEIGHT=300></APPLET>

Getting JAR file for Applet doesn't work

Hi,
We have the following problem: we have some clients who want to use our applet. There are some clients that have problems with receiving the .jar file:
When the applet tries to start we get a ClassNotFoundException: 'prestaties.class' not found. (the client wants to acces the class file directly from the server)
If we check the .jar file, it exists on the client, but the file is empty.
What could be the problem?
- PRoxy or firewall blocks the jar file
- applet doesn't have enough rights to write.
Does anyone a solution, some workarounds or suggestions for this problem.
Thanks!
Luk

Hi,
Thanks for answering my question!
Here is the extra information you asked.
At server side everything is OK (the jar file is present and has all the class files).
Where working with Weblogic server 4.51
The clients run JRE 1.3.0-C
I can't give you the applet code (confidential) but here is the html code:
<OBJECT classid="clsid:8AD9C840-044E-11D1-B3E9-00805F499D93" width="600" height="80" align="middle">
<PARAM NAME="cache_archive" VALUE="prestaties.jar">
<PARAM NAME="cache_option" VALUE="Plugin">
<PARAM NAME="cache_version" VALUE="1.4.2.1">
<PARAM NAME="code" VALUE="be.vdab.cvsesf.applet.prestaties.PrestatiesApplet">
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     <PARAM NAME="cursusId" VALUE="23178">
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     <PARAM NAME="locatie" VALUE="TESTDOSSIER HELKPDESK / 0">
     <PARAM NAME="instructeur" VALUE="TESTDOSSIER HELKPDESK / 0">
     <PARAM NAME="WebLogicSession" VALUE="1">
<COMMENT>
<EMBED type="application/x-java-applet;version=1.3" width="600" height="80" align="middle"code="be.vdab.cvsesf.applet.prestaties.PrestatiesApplet"codebase="/lib"pluginspage="cvsesf/plugin.jsp"cache_option="Plugin" cache_version="1.4.2.1" cache_archive="prestaties.jar" windowId = "185498422412000"cursusId = "23178"opleiding="boetseren" organisator="TESTOE Omschrijving" locatie="TESTDOSSIER HELKPDESK / 0" instructeur="TESTDOSSIER HELKPDESK / 0"WebLogicSession="1">
<NOEMBED>
</COMMENT>
          <html>
               <head>
                    <title>Java plugin download</title>
                    <meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
                    <link rel="stylesheet" href="../includes/vdabstyle.css">
               </head>
               <body bgcolor="#FFFFFF">
               <TABLE width="600" border="0" cellpadding="1" cellspacing="0">
                    <tr>
                         <td>
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                              Ofwel kan u de plugin hier zelf downloaden (<U>opgelet:</U> bestand is 8 MB groot).<br><br>
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                         </td>
                    </TR>
               </table>
               </body>
          </html>
     </NOEMBED>
</EMBED>
</OBJECT>
Hope this helps.
Luk

Use classes from a jar archive from in a jar archive

Hi, I am making a program and I need some the classes in a certain jar archive for tehm to work. Well my program workes before I add it to a jar be when I make it into one and put the needed jar in it, the program breaks. So does anyone know how to access the class of the jar in my jar?

Well my program workes before I add it to a jar be when I make it into one and put the needed jar in it, the program breaksIt might be easier not to nest the jar files. Instead make the "needed" jar part of the class path when you make your jar file's manifest.
[http://java.sun.com/docs/books/tutorial/deployment/jar/downman.html]

Virus scan failed Error on deploying a web application having a jar file for calling the applet on the jsp page

Hi,
I have an applet application that i want to deploy on the Oracle cloud.
So i have created a jar file for the applet application and i am using this jar to call the applet on a jsp page.
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Or do we need to request for any extra permissions for the same?
Thanks,
Manoj

I don't see applets mentioned in the supported features nor in the unsupported features so not sure if they are supported you would likely need to contact the operations team to confirm.
Jani Rautiainen
Fusion Applications Developer Relations
https://blogs.oracle.com/fadevrel/

How to use database file within jar archive

Hi. I'm quite new in Java programming, and I'm wondering if what I did makes sense or not.
In my applet I'm using a MS Access Database file, which is contained in the same Jar Archive like the Applet class file. I tried and tried to use this Database file directly but it wouldn't work. Than I read in some other forum that it is not possible to use the database file directly within the archive. First question: Is that true?
Than I desided to extract the DB file in the init() method of my applet to the default temporary foulder. When the program is closed I use the destroy() method to delete it again. Everything works well now. But is this the typical way this is done?
Thanks for help!

Hi,
here is the code which extracts the database file out of the jar archive (the same archive in which the class file is):
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File TempFolder = new File(System.getProperty("java.io.tmpdir"));
//create (empty) db file
efile = new File(TempFolder, "steelSections.mdb");
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if (!efile.exists()) {
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InputStream in = new BufferedInputStream(this.getClass().getClassLoader().getResourceAsStream(
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OutputStream out = new BufferedOutputStream(new FileOutputStream(efile));
//-Buffer to copy the data
byte[] buffer = new byte[2048]; //buffer to copy the binary
for (;;) {
int nBytes = in.read(buffer); //read data
if (nBytes <= 0)
break; //no more data to read
out.write(buffer, 0, nBytes); //write data
out.flush(); //close out and in streams
out.close();
in.close();
If you have the db file in an other jar archive file you need a referenze to the entry in the other jar archive. I'm not sure how to get this, but I'm sure you fill find a solution by searching in this forum...
Good luck!

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Hi,
Could Any one please tell me, How to Access a File from within an Applet. The File resides inside a zip which was Archived using <Applet> Tag.
Actually, I want to write an application which runs both online and offline. So I have chosen Applet and All the files Which I need are zipped and is Archived through <Applet ARCHIVE="example.zip">.
Now I want to access those XML files which are inside example.zip from my Applet.
How can I do that?
I think I will get security Exception.
How to get rid of this security Exception.
Kindly Answer soon.......
It's very urgent.
Thanking you,
KumudaRaj

Did you already try signing a jarfile? If no ->>
You can call a class inside a jar-file within the applet.
if this class should be able to acces files the jarfile
first has to be signed. to do this, you must generate a key.
the complete work:
1. write your applet
2. write a html-page with following code:
<APPLET code="guestbook.class" archive="guestbook.jar" width=600 height=400></APPLET>
3. make a zip-file with the guestbook.class, guestbook.form, guestbook$1.class, guestbook$... and rename it to guestbook.jar
4. in the console type:
keytool -genkey -alias YOURNAME
5. sign the key to your jarfile with:
jarsigner guestbook.jar YOURNAME
6. try the applet. a warning should appear which you have to answer
with YES then it should work
my trouble is that i cant acces files anyway because right now i don�t
alreadv have the clue to get the right (absolute?) path for the file. means i get an ioexception because the applet cant find the file :-((
does anyone know how to solve this problem then? my code is:
FileReader Stream = new FileReader("/members/Ui97u8g4f6b89mj90kh5gbr4ecf6KXC4/guestbook.txt");
...

Accessing files in a JAR from an Applet

I've been stuck trying to get my applet to work online. The applet and its inner classes, as well as a folder with a bunch of text files it needs to run, are all in a jar file (on a geocities website =/ just trying to get it working). My html code for the applet looks like this:
<applet code=Graph.class archive="Grapher.jar" height="600" width="1000">
</applet>
Graph is the class that runs the applet, and it has some inner classes for buttons and a drawing pane. When I try to run the applet online, I get this error:
java.lang.NoClassDefFoundError: Graph$MyDrawPanel
     at java.lang.Class.getDeclaredConstructors0(Native Method)
     at java.lang.Class.privateGetDeclaredConstructors(Unknown Source)
     at java.lang.Class.getConstructor0(Unknown Source)
     at java.lang.Class.newInstance0(Unknown Source)
     at java.lang.Class.newInstance(Unknown Source)
     at sun.applet.AppletPanel.createApplet(Unknown Source)
     at sun.plugin.AppletViewer.createApplet(Unknown Source)
     at sun.applet.AppletPanel.runLoader(Unknown Source)
     at sun.applet.AppletPanel.run(Unknown Source)
     at java.lang.Thread.run(Unknown Source)
I know that Graph$MyDrawPanel is in the jar, and the applet works in NetBeans, what can i do to make firefox look inside the jar to find my inner classes?

Try this:
<applet code="InteractiveGrapher.Graph.class" codebase="." archive="monarchive.jar" width="1000" heigth="600">
</applet>See http://java.sun.com/j2se/1.5.0/docs/guide/jar/jarGuide.html
See also the example in the java tutorial
http://java.sun.com/docs/books/tutorial/deployment/applet/browser.html
(See the code source of the web page)
hth,
Message was edited by:
java_2006

Problems with JApplet, jar-Archive, packages and IE5

Hello!
I have a problem with a JApplet and Internet Explorer 5. I made a jar archive of my classes. The classes are
members of a package. The jar archive also contains images.
The structure of the archive:
com/mycomp/myapp/DemoApplication.class
com/mycomp/myapp/DemoApplet.class
<more classes>
com/mycomp/myapp/images/hp_logo.gif
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I used the sdk 1.3.1 to compile the classes.
My problem: when I start the html file on NT with IE5, I get the error message below:
I try to create a label containing an icon with:
topLabel.setIcon(new javax.swing.ImageIcon(getClass().getResource("images"+fs+"hp_logo.gif")));It works on Sun with Netscape 4.67 and SDK 1.3.1 installed.
Should I move the images directory inside the jar archive to another place or is the html code not correct?
The error message:
java.lang.NullPointerException
     at javax.swing.ImageIcon.<init>(Unknown Source)
     at com.mycomp.myapp.DemoApplication.initComponents(DemoApplication.java:158)
     at com.mycomp.myapp.DemoApplication.<init>(DemoApplication.java:55)
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     at java.lang.Class.newInstance0(Native Method)
     at java.lang.Class.newInstance(Unknown Source)
     at sun.applet.AppletPanel.createApplet(Unknown Source)
     at sun.plugin.AppletViewer.createApplet(Unknown Source)
     at sun.applet.AppletPanel.runLoader(Unknown Source)
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<!DOCTYPE HTML PUBLIC "-//IETF//DTD HTML//EN">
<html>
<head>
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</head>
<body>
<BODY LINK="#0000ff" VLINK="#800080" BGCOLOR="#37a1a7">
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<SCRIPT LANGUAGE="JavaScript"></SCRIPT>
<COMMENT><SCRIPT LANGUAGE="JavaScript1.1"></SCRIPT></COMMENT>
<SCRIPT LANGUAGE="JavaScript"></SCRIPT>
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<PARAM NAME = CODE VALUE = com.mycomp.myapp.DemoApplet >
<PARAM NAME = CODEBASE VALUE = "." >
<PARAM NAME = ARCHIVE VALUE = "DemoApplet.jar,classes12.zip" >
<PARAM NAME="type" VALUE="application/x-java-applet;jpi-version=1.3.1">
<PARAM NAME="scriptable" VALUE="false">
</APPLET>
</NOEMBED></EMBED></OBJECT>


</body>
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Gruesse,
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seems like it couldn't find the image file... try to give it the absolute path to the file first to see if this is the root of the problem... and then try to find alternative ways to not give it the absolute path...

PlugIn and Swingall for applets not enough

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JAR files and Applets

I'm completely new to the whole .jar thing so i was wondering, after i package an applet and its respected classes within a .jar archive. what information should be in the manifest file?
lets say the applet is called, AppletText.class , and it makes use of the classTest.class class.
im using netbeans and i made it generate manfest file automaticaly. this is what it gives.
Manifest-Version: 1.0
Created-By: NetBeans IDE
Specified-By: TestJar.jarContent
when i click to execute the jar, i get an error message
Failed to load Main-Class manifest attribute from
C:\Documents and Settings\xxxxxxxxxx\xxxxxxxxxxxxx\xxxxxxxxxxx\AppletJartest.jar
x's are used to censor filenames
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Just for reference may be. Sorry if it does not met your need..:
How to jar a packaged java class? (I write this so I don't forget to create jar file again :-( ..)
Consider the package is under the folder c:\classes and you have folder ml where you write several packages such as
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- package ml.utils (c:\classes\ml\util)
- etc..
- and a main class, lets say "tool" as package under ml\gui (package ml.gui.tool)
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Manifest-Version: 1.0
Main-Class: ml.gui.tool
Created-By: XXXXXX
Note:
* tool is the main class that will be executed
* the purpose of manifest can be found anywhere
in internet
Step2: Open MSDOS to c:\classes
Step3:
Execute the following command:
jar -cvfm <jarfiletobecreated.jar> Manifest.mf <packaged class>
In my case, the command is:
jar -cvfm ml.jar Manifest.mf ml/*
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Correct if i'm wrong.

Jar files and applet

My applet class is using other classes in my package,
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I did created the jar file , but its not loading up, the browser just says Loading java applet, what might be the reason, does it depends on size of jar file?
or my tags are wrong.
my applet tag is
<html>
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code = "front.class"
width.. >
the front.class file is also in myjar.jar.
Any help....
Also one more question,
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I have a gui, when a particular button is clicked on applet
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Thanks

You didn't show all of your applet tag, but it should look like this:
<HTML>
<APPLET CODE = front.class, ARCHIVE = myjar.jar, width = ???, height = ???>
</APPLET>
</HTML>
Assuming your applet is not crashing, this should load it. I recommend using the appletviewer tool in the JDK, it provides more detailed error messages. I hope this works for you.
Now inter-applet communication. This is forbidden, sorry. However, if you really want to get fancy; remember that all applets can communicate back to the host from which they came. So if you want to build a small server on your host machine which all your applets log into, they can then communicate with each other through the server.

Jar file in applet not saved in internet files when using jdk plugin

Hello,
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What needs to be done so the jar file is not downloaded every time, to work like java version 1.x ?
Thanks for your help in advance with this one.
Jay Ford

Hi Jay Ford,
Enable the "Recycle Classloader" in Control Panel-->Java Plug-in1.3.1-->Basic.
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Anil.
Developer Technical Support,
Sun Microsystems Inc,
http://www.sun.com/developers/support

Load a file stored in a Jar Archive

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Sri,
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