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Thread: Running an Applet With JAR file

  1. #1
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    Question Running an Applet With JAR file

    Hi,
    I have created an Applet as follows and made it into a jar file (SampleApplet.jar).

    import java.applet.Applet;
    import java.awt.Graphics;
    public class SampleApplet extends Applet
    {
    public void paint(Graphics g)
    {
    	String ss;
    	Sample s=new Sample();
    	ss=s.test("From Sample Class");
    	g.drawString(ss, 20,30);
    }
     
    }

    I have created a seperate dependent class as follows and made it into a jar file (Sample.jar).

    public class Sample 
    {
    	public String test(String a)
    	{
    		System.out.println(a);
    		return a;
    	}
     
    }

    SampleApplet is depends on Sample

    I have created a HTML file as,

    HTML Code:
    <html>
    <head>
    <meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
    <title>Sample Applet</title>
    </head>
    <body>
    <applet name="SampleApplet" code="SampleApplet"></applet>
    </body>
    </html>
    Now I need to run the applet just by running the HTML Page in the browser (and by having only those two jar files) . How to achieve it ?

    Please help !

    Thanks,

    Ramesh Jothimani


  2. #2
    Super Moderator Norm's Avatar
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    Default Re: Running an Applet With JAR file

    What error do you get in the browser's java console?
    Do you know about the <APPLET tag's archive= attribute?
    That should point to the jar files containing the class files you need.
    Last edited by Norm; July 19th, 2011 at 11:23 AM.

  3. The Following User Says Thank You to Norm For This Useful Post:

    rameshiit19 (July 20th, 2011)

  4. #3
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    Exclamation Re: Running an Applet With JAR file

    I have modified my HTML code as follows,

    HTML Code:
    <html>
    <head>
    <title>Sample Applet</title>
    </head>
    <body>
    <applet name="sampleapplet" code="SampleApplet" archive="SampleApplet.jar" height="80" width="100" mayscript="true"></applet>
    </body>
    </html>
    My manifest file looks as follows (In SampleApplet.jar),
    Manifest-Version: 1.0
    Class-Path: C:/Sample.jar
    Created-By: 1.6.0_20 (Sun Microsystems Inc.)
    I am getting the following errors in Java Error Console:

    load: class SampleApplet.class not found.
    java.lang.ClassNotFoundException: SampleApplet.class
    at sun.plugin2.applet.Applet2ClassLoader.findClass(Un known Source)
    at sun.plugin2.applet.Plugin2ClassLoader.loadClass0(U nknown Source)
    at sun.plugin2.applet.Plugin2ClassLoader.loadClass(Un known Source)
    at sun.plugin2.applet.Plugin2ClassLoader.loadClass(Un known Source)
    at java.lang.ClassLoader.loadClass(Unknown Source)
    at sun.plugin2.applet.Plugin2ClassLoader.loadCode(Unk nown Source)
    at sun.plugin2.applet.Plugin2Manager.createApplet(Unk nown Source)
    at sun.plugin2.applet.Plugin2Manager$AppletExecutionR unnable.run(Unknown Source)
    at java.lang.Thread.run(Unknown Source)
    Caused by: java.io.FileNotFoundException: C:\Documents and Settings\Ramesh\Desktop\RameshWorkSpace\SampleAppl et\src\SampleApplet\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.http://www.protocol.file.FileURLConn...onnect(Unknown Source)
    at sun.net.http://www.protocol.file.FileURLConn...Stream(Unknown Source)
    at sun.plugin2.applet.Applet2ClassLoader.getBytes(Unk nown Source)
    at sun.plugin2.applet.Applet2ClassLoader.access$000(U nknown Source)
    at sun.plugin2.applet.Applet2ClassLoader$1.run(Unknow n Source)
    at java.security.AccessController.doPrivileged(Native Method)
    ... 9 more
    Exception: java.lang.ClassNotFoundException: SampleApplet.class
    load: class SampleApplet.class not found.
    java.lang.ClassNotFoundException: SampleApplet.class
    at sun.plugin2.applet.Applet2ClassLoader.findClass(Un known Source)
    at sun.plugin2.applet.Plugin2ClassLoader.loadClass0(U nknown Source)
    at sun.plugin2.applet.Plugin2ClassLoader.loadClass(Un known Source)
    at sun.plugin2.applet.Plugin2ClassLoader.loadClass(Un known Source)
    at java.lang.ClassLoader.loadClass(Unknown Source)
    at sun.plugin2.applet.Plugin2ClassLoader.loadCode(Unk nown Source)
    at sun.plugin2.applet.Plugin2Manager.createApplet(Unk nown Source)
    at sun.plugin2.applet.Plugin2Manager$AppletExecutionR unnable.run(Unknown Source)
    at java.lang.Thread.run(Unknown Source)
    Caused by: java.io.FileNotFoundException: C:\Documents and Settings\Ramesh\Desktop\RameshWorkSpace\SampleAppl et\src\SampleApplet\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.http://www.protocol.file.FileURLConn...onnect(Unknown Source)
    at sun.net.http://www.protocol.file.FileURLConn...Stream(Unknown Source)
    at sun.plugin2.applet.Applet2ClassLoader.getBytes(Unk nown Source)
    at sun.plugin2.applet.Applet2ClassLoader.access$000(U nknown Source)
    at sun.plugin2.applet.Applet2ClassLoader$1.run(Unknow n Source)
    at java.security.AccessController.doPrivileged(Native Method)
    ... 9 more
    Exception: java.lang.ClassNotFoundException: SampleApplet.class
    Last edited by rameshiit19; July 20th, 2011 at 02:27 AM.

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    Default Re: Running an Applet With JAR file

    class SampleApplet.class not found.
    This output does not look like it came when you used this HTML: code="SampleApplet"
    The code= tag does not have .class after the class name.
    Where did the .class come from in the error message?

    I don't know if the browser will use the Class-path: line from the manifest file to find jar files.
    I do think it will look in jar files in the archive= attribute to use jar files.

  6. The Following User Says Thank You to Norm For This Useful Post:

    rameshiit19 (July 20th, 2011)

  7. #5
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    Default Re: Running an Applet With JAR file

    Found the bug.It's in manifest file.

    Specified Class-Path: C:/Sample.jar as
    Class-Path: /C:/Sample.jar
    . It's working fine now.

    Thanks !

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