Running an Applet With JAR file

**rameshiit19** · July 19th, 2011, 02:28 AM

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

**Norm** · July 19th, 2011, 11:20 AM

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.

**rameshiit19** · July 20th, 2011, 01:38 AM

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

**Norm** · July 20th, 2011, 06:20 AM

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.

**rameshiit19** · July 20th, 2011, 07:10 AM

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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