Help deploying an applet

I have an applet which uses 2 archives: applet.jar and swing.jar
I need to test this applet with our web application, because it needs to communicate with other servlets in order to get data. The problem is, the browser keeps my applet in a sandbox so I get security exceptions left and right.
I then tried to use jarsigner to get the applet self-signed (not by verisign or anythign like that). I signed both the applet.jar and swing.jar successfully, and tried to run it again, but same security exceptions.
Do I need to alter my <APPLET> tag when using signed jars? Maybe need to add those namespace and useslibrary paramters? If so, what would the namespace be? (I ran jarsigner with no options, so everythign is default)

some more info..
the browser I'm using is Internet Explorer, so all the security exceptions are from the local com.ms package. I tried running my applet in Netscape, but the page would fail to load completely (the whole browser froze).
Inside my applet, I make the following call:
if (Class.forName("com.ms.security.PolicyEngine") != null) {
PolicyEngine.assertPermission(PermissionID.SYSTEM);
System.out.println("Permissions obtained");
}and this call is successful as I check the Java Console and see my "permissions obtained" printed out.
yet still while running the applet I get a security exception while trying to access the System clipboard, and somethign about Illegal Thread Group- this one gets thrown very often and dosen't seem to be from any calls I specifically make- it looks like it comes from somethign Swing is doing in the background.
please help!

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Deploying an Applet

hey there,
if created a applet with which you can send SQL statements to a Oracle Database and then see the results in a nice swing table (JTable). If Only used the connection manager to acces the database. In the JDeveloper environment this works very nice.
My problem starts when I want to deploy the Applet somewhere else. The error i'm getting in my iExplorer statusbar (after using the deployment wizard) is:
load: package1.MainApplet cant be instantiated.
if got some experience with java and using jars and stuff. I'm pretty sure it's not that (I've tried basicly everything I could think of.
Is it possible that this error occurs because I'm not running it from the database computer. I thought that it just wouldn't be able to log on to the database. (the logon secuence starts after clicking a button so I expect it would be able to start)
please let me know what you think even if you think it's of no help, dialog often helps you know
thanks
Erik
[email protected]

Hi,
It looks like you are not using BC4J in your applet. There are some bugs there for the 3.1.1 release, but not the ones you are getting.
The most important thing for deployment of an applet is:
1. Deploy EVERYTHING that your applet needs to the server. This includes the applet classes themselves, as well as dependency libraries such as the classes12.zip file for the connection, rt.zip, etc. Best thing to do here is to select your project in the Navigator, and choose Properties ... from the right-mouse menu. Now click the Libraries tab. Here you will see a list of libraries. All of the jar/zip files that make up these libraries need to be deployed with your applet to the webserver.
2. If you have deployed all of your dependency libraries to the webserver, you will need to make sure that the HTML file that contains the applet tag correctly lists all of the jars/zips in the ARCHIVE tag. Note that if you are using the JDK 1.2 plugin (you should), then the ARCHIVE tag appears MORE THAN ONCE in your HTML file. Open that file in a text editor and make sure the ARCHIVE list is correct for ALL instances of the tag.
Here are some good generic applet references to check:
Borland JBuilder doc: http://www.borland.com/techpubs/jbuilder/jbuilder3-s/pg/applets.html
JavaSoft Plugin Download: http://java.sun.com/products/plugin/
JavaSoft Applets Resources Page: http://www.javasoft.com/applets/index.html
null

Deploying my applet

hello everyone.
I have spent the morning reading up on how to deploy my applet but i am just getting frustrated. I had no success trying to create the jar file for my applet. All i kept getting was 'bad command of filename' in the command line. But i don't need a .jar to put my applet in a html page right? All i need is the .class file and the one image I am using?
I put the 'Applet1.class', the picture, and the html page in the same directory but i was hoping if someone could explain why i am not viewing it. here's what i have in the applet tag:
<applet
code = "Applet1.class"
width = "400"
height = "300"
hspace = "0"
vspace = "0"
align = "top"
>
</applet>
I just don't understand how to deploy my applet. I am using JBuilder 5 Personal and in it's tutorial it says that the "JDK must be on your path" but i don't know how to do this in the command line! I never learned DOS so my knowledge of it is merely navigational and Borland's site is just horrible for finding answers. (at least for newbies)
Please help me.
I have three files: the .class, .gif, and the .html in the same directory. How do i put them together?
getting sad,
-cloudtwist-

1. check your classpath to see whether it is correct for both your java commands as well as your working directory
2. make sure that your .html is pointing to the correct directory in which your .class file resides.
3. it could also be that you might not have the proper java plug-in in your browser window. You can atleast momentarily avoid this problem by implementing the applet below which you can view in an appletviewer.
you can try this very simple applet to check how an applet works. Note that in this I have put the html code along as a comment and it should be run with the command "appletviewer basicapplet.java" after compilation. You don't need a .html file for this.
If you are getting
import java.awt.*;
import java.applet.Applet;
/*<applet code=basicapplet.class
width=300
height=300>
</applet>*/
public class basicapplet extends Applet{
public void paint(Graphics g){
g.drawString("Hello from Java", 80, 120);

How to Deploy an Applet successfully?

I tried the tutorial in the JDeveloper 2.0 Beta. Everything
worked fine. I could run the applet within the JDeveloper. I
completed the section on deploying the applet. When I started
running the applet using IE, I got the following message "load:
tutorial.EmpApplet can't be instantiated" and the program
stopped. What could be the problem? How do I deploy my applet?
null

when deploying application i am getting
java.lang.ClassFormatError.borland/jdbc/dataset/Dataset
(local variable name has bad constant pool index)
can ya please reply soon;
JDeveloper Team (guest) wrote:
: Bernard,
: By 'Js2', I assume you mean JDeveloper 2.0 Beta? If that is
the
: case, then the deployment wizard can be found as follows:
: Select New from the File menu to display the New Gallery.
: Click on the Deployment tab (may have to click on right arrow
: (->) to view all the tabs in the New Gallery.
: I think the one you want for applets is the Simple Archive.
: Double-click on the type of deployment you want to start the
: deployment wizard.
: Note: This will be changing slightly in 2.0 production.
: Deployment will be available from the Project menu instead of
the
: new Gallery, and all deployment wizards will be incorporated
into
: one, where you choose the deployment type on the first page of
: the wizard.
: -L
: Bernard Polarski (guest) wrote:
: : I could manage to run in netscape an applet that connect to
my
: : 7.3.4 DB, but I used Kawa on the JDK 1.1.7b of Sun. For
jsuite,
: : the problem is that borland & Oracle redefine many java
classes
: : of Sun and you must bring these new classes with you in a
Zip
: or
: : Jar file. The problem in Js2, is that I did not found a
: : deployment wizard to help create a zip file containing all
the
: : predefined classes. This wizard exists in Jbuilder2 but I
could
: : not manage to find it in JS2. Suppose it come in next
version.
: : B. Polarski
: : JDev team (guest) wrote:
: : : Looks like the appletviewer does not have access to the
: : : borland.jbcl.* classes. Did you choose to check the
borland.*
: : : classes for dependencies before generating the archive?
: : : Also check the .html page to see if the <archive> tag is
: : there.
: : : Hope this helps.
: : : Regards
: : : JDev Team
: : : Worm (guest) wrote:
: : : : TK Cheng (guest) wrote:
: : : : : I tried the tutorial in the JDeveloper 2.0 Beta.
: : Everything
: : : : : worked fine. I could run the applet within the
: : JDeveloper.
: : : I
: : : : : completed the section on deploying the applet. When I
: : : started
: : : : : running the applet using IE, I got the following
message
: : : : "load:
: : : : : tutorial.EmpApplet can't be instantiated" and the
program
: : : : : stopped. What could be the problem? How do I deploy
my
: : : : applet?
: : : : I got the same message in IE 5.0, "Failed to load" in
: : Netscape
: : : : 4.5, and finally tried HotJava 1.1.5 and got:
: : : : "File not found when looking for:
: : : : borland.jbcl.dataset.StorageDataSet
: : : : null:
: : : : java.lang.NoClassDefFoundError".
: : : : If anyone knows how to fix this PLEASE let me know.
: : Worm
null

How to 'deploy' an Applet when class files are on client machine?

Hi all,
I've searched through these forums and I can't find where my specific question has been asked before, so please accept my apologies for any duplication.
I am trying to develop an applet for use on an intranet. (The specific requirement is that the applet must operate a scanner, and upload the scanned images to the database - we want it to be an applet so that it seamlessly integrates with the rest of the web application from the user's POV).
Therefore the applet needs to run outside of the sandbox, but I don't want to go to all the hassle of getting a certificate from Verisign and signing the applet - that doesn't seem like it should be necessary, since there is no problem getting access to the client PC to install the class files by hand!
I have read on this tutorial page that applets "that are loaded from the local file system (from a directory in the user's CLASSPATH) have none of the restrictions that applets loaded over the network do," so I don't think I am barking up the wrong tree:
http://java.sun.com/docs/books/tutorial/deployment/applet/security.html
That is exactly what I want to do! But whenever I try to run the applet, I get a no class definition found exception. However, if I run the applet as a standalone application (using its static main method) then the JRE has no trouble locating the class file - so I know that my CLASSPATH environment variable is set ok.
Therefore I think the problem must be in my JNLP file. This is what mine looks like at present:
<?xml version="1.0" encoding="UTF-8"?>
<jnlp spec="1.0+" codebase="http://localhost:8080/JGNS008" href="http://localhost:8080/JGNS008/scanner-applet.jnlp">
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         main-class="uk.co.fooware.ScannerApplet"
         width="72"
         height="20">
     </applet-desc>
     <update check="background"/>
</jnlp>How do I rewrite this so that it doesn't try to download the class files from the network?
Many thanks,
Richard.

richardwild wrote:
..I am trying to develop an applet for use on an intranet. (The specific requirement is that the applet must operate a scanner, and upload the scanned images to the database - we want it to be an applet so that it seamlessly integrates with the rest of the web application from the user's POV).
Therefore the applet needs to run outside of the sandbox, but I don't want to go to all the hassle of getting a certificate from Verisign and signing the applet - that doesn't seem like it should be necessary,.. Code can be digitally signed without a 'verified' certificate from Versign.
..since there is no problem getting access to the client PC to install the class files by hand!
I have read on this tutorial page that applets "that are loaded from the local file system (from a directory in the user's CLASSPATH) have none of the restrictions that applets loaded over the network do," so I don't think I am barking up the wrong tree:
http://java.sun.com/docs/books/tutorial/deployment/applet/security.html
Huh. I had never heard of that, but since I do not have access to my end user's classpath it is not that important to me.
BTW - I am guessing they mean the path indicated by [http://pscode.org/prop/all.html?prop=java.class.path].
And putting classes into JRE folders seems very hackish to me.
That is exactly what I want to do! But whenever I try to run the applet, I get a no class definition found exception. However, if I run the applet as a standalone application (using its static main method) then the JRE has no trouble locating the class file - so I know that my CLASSPATH environment variable is set ok.Huh?
Therefore I think the problem must be in my JNLP file. Huh?!? Why not deploy the applet using a standard applet element? The only way to configure an applet using a JNLP is ..
a) If the applet is intended to be free floating.
b) If the applet is intended to be embedded in a plug-in2 architecture JRE. Why impose that restriction, when it seems unnecessary and unproductive?
Note that the second option is very new, and I would not expect all the things mentioned in the document you linked, to apply equally to JNLP embedded applets. If you want this applet embedded, I suggest you drop the entire JNLP approach and use a standard applet element.

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null

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Welcome to the Sun forums.
It would be worth checking the deployment launch file (JNLP) using JaNeLA *(<- link).* As the other poster mentioned, the file is invalid (OK - not well-formed, but possibly also invalid after that is fixed). Also, JaNeLA should warn you that the resources in WEB-INF are not accessible.
Please do not repost(1) questions in future.
(1) Post a question twice, or more.

Re: HELP - ON BROWSER, Applets, JMF & Swings & Plugins - Applet deployment

hiiiiii,
plz send me ur working code of media player in java .i need this for my major project.i m facing problem with media package .
thnx.

Oh, I see. IE makes you use the Information Bar:
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When I copy and compile your example in a temporary directory and enter the URL in IE6:
C:\temp\WelcomeApplet.html
There is a message:
TItle: Information Bar
Did you notice the information Bar?
The Information Bar alert you when Internet Explorer block a
pop-up window or file download that might not be safe. If a
Web page does not display properly, look for the information
Bar (net the top of your browser)
[Checkbox] Do not show this message again.
(link) Learn about the Information Bar
(button) OK
I click OK
and the Information Bar says:
To help protect your security, Internet Explorer has restricted this file from showing active content that could access your computer. Click here for options...
I click on the Information Bar and a context menu appears:
Allow Blocked Content...
What's the Risk?
Information Bar Help
I choose Allow Blocked Content...
Title: Security Warning
Allow active content such as script and ActiveX controls can be useful,
but active content might also harm your computer.
Are you sure you want to let this file run active content?
Yes/No
I choose Yes
It works for me in IE 6

Help deploying an applet

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