Including applets in JSP - problem!!

I'll begin by admitting that I am fairly new to JSP. That said, I am experiencing a ClassNotFoundException when trying to include an applet in a JSP under certain conditions. Here's the detail:
I'm using Tomcat 4.0.4 and am working in the default ROOT webapp directory. This is running on Win2k Pro on port 8080. I HAVE managed to get the applet to load under the following circumstances:
- JSP page in ROOT/jsp directory
- applet class file (and supporting classes) ALSO in ROOT/jsp directory
That's just great... but I want to be able to place the applet class file and supporting classes with all of the other class files in ROOT/WEB-INF/classes. Here's the scenario that fails time and time again:
- JSP page in ROOT/jsp directory
- applet class file (and supporting classes) in ROOT/WEB-INF/classes
- in this scenario I have added a 'codebase' attribute to the applet tag (please be aware that I have tried this with both the APPLET tag and the jsp:plugin tag, each method yielding identical results)
- I have tried several different codebase values, all listed below:
codebase="../WEB-INF/classes/"
codebase="http://localhost:8080/servlet/"
codebase="http://localhost:8080/WEB-INF/classes/"
codebase="."
and I have tried it w/o a codebase at all
None of these help the JSP to find the applet class file. I've really thrown my hands up in the air with this. I realize that every 3rd or 4th thread is typically a beginner with some Class not found error... but I've put my time in on this one, and I cannot figure it out. Thanks.

Hi, Ben
You bring up a very good issue that a lot of these books about JSPs and Servlets usually forget to mention.
I dont know what sort of Web Servlet Container you are using, but I know that in Tomcat there is a 'lib' and and 'classes' directory, so if you want to have classes that are used by different applications from different directories then you can place them there. If you want you can compile all these classes into a jar and put that jar either in the 'TOMCAT_HOME/lib' or 'TOMCAT_HOME/common/lib' directories or you can simply put all the .class files into either the 'TOMCAT_HOME/classes' or 'TOMCAT_HOME/common/classes' directories. This way your classes will be known to any applications running on your webserver.
If, however, you want supporting classes to be only used by servlets or jsps, then you should put them in the web-inf directory.
Let me know if this works,
Val.

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Re: Including Applet in JSP with Dynamic input| Help needed

Hi All,
We are into a project in Oracle Portal Server where in we want to embed a result of a standalone application in Portal page.
We can do that once we can embed the result of the standalone application which generates applet based on the input it gets from the current application's database.
If it was static we could have used jsp:plugin but, it fails in our case!
We are clueless as to how to embed an applet which will pick up the data dynamically.
Can anyone of you help me in this regard?
Thanks & Regards
Arthi

Hi Arthi,
I think this might help you to get an idea why jsp:plugin tag does not allow for dynamically called applets.
<jsp:plugin type=applet height="100%" width="100%"
archive="myjarfile.jar,myotherjar.jar"
codebase="/applets"
code="com.foo.MyApplet" >
<jsp:params>
<jsp:param name="enableDebug" value="true" />
</jsp:params>
<jsp:fallback>
Your browser does not support applets.
</jsp:fallback>
</jsp:plugin>
The plugin example illustrates a <html> uniform way of embedding applets in a web page. Before the advent of the <OBJECT> tag, there was no common way of embedding applets. This tag is poorly designed and hopefully future specs will allow for dynamic attributes (height="${param.height}", code="${chart}", etc) and dynamic parameters. Currently, the jsp:plugin tag does not allow for dynamically called applets. For example, if you have a charting applet that requires the data points to be passed in as parameters, you can't use jsp:params unless the number of data points are constant. You can't, for example, loop through a ResultSet to create the jsp:param tags. You have to hand code each jsp:param tag. Each of those jsp:param tags however can have a dynamic name and a dynamic value.
I think you can get better information if you look in to the below link
http://pdf.coreservlets.com/CSAJSP-Chapter12.pdf
Many Thanks,
Ramesh.

Swing Applet in JSP: problem with fetching data from database

i am facing a problem while fetching data from database using Swing Applet plugged in a JSP page.
// necessary import statements
public class NewJApplet extends javax.swing.JApplet {
private JLabel jlblNewTitle;
private Vector vec;
public static void main(String[] args) {
JFrame frame = new JFrame();
NewJApplet inst = new NewJApplet();
frame.getContentPane().add(inst);
((JComponent)frame.getContentPane()).setPreferredSize(inst.getSize());
frame.pack();
frame.setVisible(true);
public NewJApplet() {
super();
initGUI();
private void initGUI() {
try {
this.setSize(542, 701);
this.getContentPane().setLayout(null);
jlblTitle = new JLabel();
this.getContentPane().add(jlblTitle);
jlblTitle.setText("TITLE");
jlblTitle.setBounds(197, 16, 117, 30);
jlblTitle.setFont(new java.awt.Font("Dialog",1,20));
jlblNewTitle = new JLabel();
this.getContentPane().add(jlblNewTitle);
Vector vecTemp = getDBDatum(); // data fetched fm DB r stored here.
jlblNewTitle.setText(vecTemp.get(1).toString());
jlblNewTitle.setBounds(350, 16, 117, 30);
jlblNewTitle.setFont(new java.awt.Font("Dialog",1,20));
} catch (Exception e) {
e.printStackTrace();
}//end of initGUI()
private Vector getDBDatum() {
// fetches datum from oracle database and stores it in a vector
return lvecData;
}//end of getDBDatum()
}//end of class
in index.jsp page i have included the following code for calling this applet:
<jsp:plugin type="applet" code="NewJApplet.class" codebase="applets"
width="600" height="300">
<jsp:fallback>Could not load applet...</jsp:fallback>
</jsp:plugin>
if i view it in using AppletViewer it runs perfectly and display the data in JLabel. (ie, both jlblTitle and jlblNewTitle).(ie, DATA FETCHES FROM db AND DISPLAYS PROPERLY)
BUT IF I CLICK ON INDEX.JSP, ONLY jlblTitle APPEARS. jlblnNewTitle WILL BE BLANK(this label name is supposed to fetch from database)
EVERY THING IS DISPAYING PROPERLY EXCEPT DATA FROM DATABASE!!!
i signed the applet as follows :
grant {
permission java.security.AllPermission;
Can any body help me to figure out the problem?

This is the Swing Applet java code
import java.awt.Dimension;
import java.sql.Connection;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
import java.util.Vector;
import javax.swing.tree.DefaultMutableTreeNode;
import javax.swing.JScrollPane;
import javax.swing.JApplet;
import javax.swing.JButton;
import javax.swing.JComponent;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JTree;
import javax.swing.ScrollPaneConstants;
import javax.swing.SwingConstants;
public class HaiApplet extends javax.swing.JApplet {
     private JLabel     jlblTitle;
     private JLabel     jlblNewTitle;
     private Vector     vec;
     * main method to display this
     * JApplet inside a new JFrame.
     public static void main(String[] args) {
          JFrame frame = new JFrame();
          NewJApplet inst = new NewJApplet();
          frame.getContentPane().add(inst);
          ((JComponent)frame.getContentPane()).setPreferredSize(inst.getSize());
          frame.pack();
          frame.setVisible(true);
     public HaiApplet() {
          super();
          initGUI();
     private void initGUI() {
          try {
               this.setSize(542, 701);
               this.getContentPane().setLayout(null);
                    jlblTitle = new JLabel();
                    this.getContentPane().add(jlblTitle);
                    jlblTitle.setText("OMMS");
                    jlblTitle.setBounds(197, 16, 117, 30);
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                    jlblTitle.setForeground(new java.awt.Color(0,128,192));
                    jlblNewTitle = new JLabel();
                    this.getContentPane().add(jlblNewTitle);
                    Vector vecTemp = getDBDatum();
                    jlblNewTitle.setText(vecTemp.get(1).toString());
                    jlblNewTitle.setBounds(350, 16, 117, 30);
                    jlblNewTitle.setFont(new java.awt.Font("Dialog",1,20));
          } catch (Exception e) {
               e.printStackTrace();
     }//end of initGUI()
     private Vector getDBDatum() {
          Vector lvecData = new Vector(10,5);
          Connection lcon = null;
          Statement lstmt = null;
          ResultSet lrsResults = null;
          String lstrSQL = null;
          String lstrOut = null;
          try {
               OmmsDBConnect db = new OmmsDBConnect();
               lcon = db.connectDb();
               lstmt = lcon.createStatement(lrsResults.TYPE_SCROLL_SENSITIVE, ResultSet.CONCUR_READ_ONLY);
               lstrSQL = "select DT_ID from P_DATATABLES";
               lrsResults = lstmt.executeQuery(lstrSQL);
               int i = 0;
               lrsResults.last();
               int length = lrsResults.getRow();
               System.out.println(length);
               lrsResults.beforeFirst();
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                    recCount++;
                    lvecData.addElement(new String(lrsResults.getString("DT_ID")));
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               }System.out.println("here 3 out fm while");
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               System.out.print("SQLException: ");
               System.out.println(e.getMessage());
          catch(Exception ex) {
               lstrOut = "Exception Occured " + ex.getMessage();
          finally {
               try {
                    lrsResults.close();
                    lstmt.close();
                    lcon.close();
                    System.out.println("[DONE]");
               catch(Exception e) {
                    System.out.println(e);
         }//end of finally
          return lvecData;
     }//end of getDBDatum()
}//end of classOfcourse the above code compiles and runs well. in Applet Viewer
I plugged the above Swing Applet in a JSP page index.jsp
<jsp:plugin type="applet" code="NewJApplet.class" codebase="applets"
               width="600" height="300">
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</jsp:plugin>Every thing is working fine in AppletViewer...But if i view this in any browser, then only the jlblTitle is displaying. jlblNewTitle is not displaying(this label name is actually fetching from thedatabase)
can any body help me regarding this matter.? Thx in Advance.

How to include applet in jsp if applet.class file in another folder

hi,
i'm getting problem when my applet.class file is not with its appropriate jsp file. i'm using jsp :plugin tag.it work when jsp file n apllet.class file at same location.
in short my jsp file is at location /webapps/jsp-examples/myproject/includeDemo.jsp
n applet i want in a WEB-INF folder.
Plz help me to solve this..
or give me other way that an applet can be loaded in jsp page n applet should be in WEB-INF file..
Help me for this

http://forum.java.sun.com/thread.jspa?threadID=5148764&messageID=9556205

Please Urgent sound applet in jsp problem

Hi please any body hekp me urgently.
I have a problem while playing a sound applet in the jsp file the error is class not found.
My applet class file is in the com.mypack.common
its code is
public class PlayErrorSoundApplet extends Applet
public PlayErrorSoundApplet()
public void init()
public void playSound()
String soundObj = getParameter("soundObj");
AudioClip sound = getAudioClip(getDocumentBase(), "success.wav");
sound.play();
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<param name="soundObj" value="error.wav">
</applet>
In the applet console i got class not found error.
please help me .....advanced thanks......

actually, codbase is a directory. so
<applet codebase="com/mypack/common" code="PlayErrorSoundApplet.class" name="soundApplet" width="0" height="0">
<param name="soundObj" value="error.wav">
</applet>this means you have something like
pacakge com.mypack.common
public class PlayErrorSoundApplet {
Make sure to put the html file in the root directory of the package structure
/myhtmlfile.html
   /com
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Including Applets in jsp without using Archive

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regards
varada rajulu
Turning Point Software Solutions India

yeah. don't use it. You specify the code (class) and the codebase tag, and the classes have to be loose on the server under the package directory structure that the classes' package is set up for.

Including Applets in JSP

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Thx
Nandoo

if you want to use applet try applet tag.
<applet codebase="" archive="xx.jar" code="xx.class" NAME="nam" width="100" height="340" MAYSCRIPT VIEWASTEXT>
<param name="param1" value=20>
</applet>

Problems with include where the include is a jsp

Hi ,
I have a typical problem. The iplanet server doesn't interpret the code
from a jsp which is included in another jsp. For eg.
code for main jsp
request.getParameter("username");
<%@ include file="/jsp/ui/left_nav.jsp" %>
processing code.
Now when I start the server and the first time I load this page I get a
dearranged page which has the code of the left_nav.jsp present in the html
output.
On opening this page to edit, when a small modification is made and the file
is saved, a reload of the same page gives the proper output with all the
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happens at translation time and does not process the requested page. An action
happens at request time and treats the requested page as a new request, thus
including the results of the invoked jsp.
BTW, the include action is the tags that looks line <jsp:inculde
page="included_page.jsp" flush="true"/> or something similar (parameters can
also be specified).
The JSP 1.1 spec has more details. See sections 2.7.5 & 2.7.6 (for the include
directive and a quick comparison of the directive vs the action) and 2.13.4 (for
the include action).
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Gurjit wrote:
Hi ,
I have a typical problem. The iplanet server doesn't interpret the code
from a jsp which is included in another jsp. For eg.
code for main jsp
request.getParameter("username");
<%@ include file="/jsp/ui/left_nav.jsp" %>
processing code.
Now when I start the server and the first time I load this page I get a
dearranged page which has the code of the left_nav.jsp present in the html
output.
On opening this page to edit, when a small modification is made and the file
is saved, a reload of the same page gives the proper output with all the
jsp's interpreted.
Thanks to one and all,
Regards,
Gurjit

Include JSP problem

Hi All,
I am trying to include a JSP in another JSP to work around as JDev does not support working with large JSP file (approx 1100 Lines),
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500 Internal Server Error
javax.servlet.jsp.JspException at com.sun.faces.taglib.jsf_core.ViewTag.doStartTag(ViewTag.java:137) at neit.SimpleInclTest._jspService(_SimpleInclTest.java:74) [neit/SimpleInclTest.jsp] at com.orionserver[Oracle Containers for J2EE 10g (10.1.3.3.0) ].http.OrionHttpJspPage.service(OrionHttpJspPage.java:59) at oracle.jsp.runtimev2.JspPageTable.service(JspPageTable.java:462) at oracle.jsp.runtimev2.JspServlet.internalService(JspServlet.java:594)
And here is how I include my JSP
<af:showDetailItem text="Sector">
<f:subview id="myInclTest">
<jsp:include page="/neit/SimpleInclTest.jsp" flush="true"/>
</f:subview>
</af:showDetailItem>
Any clue ? why I am not able to include even a simple JSP ?
Thanks in Advance

So glad that you managed to find the solution.
But please pay attention that if the main page has a h:form component and the included pages have that component too, then their functionality may fail. And another thing you have to pay attention to is the bindings.
Anyway, if you need any further more info, please, feel free.
Best Regards
RJundi

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i have class named myapplet.class
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so please help me it is so urgent and important for me bcoz
i have to complete my project as early as possible
Thanks in advance

my jsp source file page path is D:\Reliance
project\WebApplication3\web\
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then i have to put my class in D:\Reliance
project\WebApplication3\build\web\WEB-INF\classes\
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Applet in JSP page

Hello! I wrote an applet and try to put in jsp page in JDeveloper:
<jsp:plugin type="applet" code="CompositeTest.class"
width="400" height="400">
<jsp:fallback>
<p>Unable to load applet</p>
</jsp:fallback>
</jsp:plugin>
and I copy the class file to folder where the JSP page is located. When I start Jsp page I have a message: "Applet not found"
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BEST REGARDS

Hi,
I am not sure the JSP file, which resides in the public_html directory, is part of the class path of the running application. If you open the project properties, you can see where JDeveloper looks for Java classes. Try and extend this setting to include the public_hml directory (you can also try and just add the source as a library path (see library section))
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Applets in Jsp generates ClassNotFoundException

hi there,
I face a problem of calling applets in Jsp.
The code to call applet is:
<jsp:plugin type="applet"
code="core.TextApplet"
width="475" height="350">
</jsp:plugin>
And I have a 'core' directory in source packages and TextApplet.java in core directory.Wehn I run the TextAppletJSP ,it gives me an error message in applet display area:
Exception:java.lang.ClassNotFoundException:core.TextApplet
Anyone who help me for this problem plz.
thanks for your help.
gezahegn

I am also getting out of memory errors, and Tomcat keeps increasing in memory on every page refresh. Please let me know if you get this resolved how you did it. Thanks.

Applets in JSP --- I'm going crazy!

I am using an applet I have written on a JSP page which I have also written.
Using: Win2K, IE6, J2SDK 1.4, Tomcat 4.0.3
I have several problems. Even if you can answer only one of them, it will be a great help!
Here is how I'm adding the applet.
<jsp:plugin type="applet" code="RawData.class" name="rawData" jreversion="1.4" width="700" height="55" >
<jsp:fallback>
Plugin tag OBJECT or EMBED not supported by browser.
</jsp:fallback>
</jsp:plugin>
</TD>
Problem 1) I can only get the applet loaded if the applet class file is in the same folder as the JSP file. Anything else, and I get a ClassNotFoundException.
Can't get the CODEBASE to do anything for me at all.
I set my codebase="/RawData/classes", but makes no difference.
I then tried Jarring my applet and placing RawData.jar in the same folder with the JSP. But also no go. I then set codebase="RawData.jar", but guess what... Nothing.
So my questions are: How do I get the applet to load from the applet.class files using codebase if the applet files are in a sub folder? And how do I get my applet to load from a Jar?
Problem 2) Once this applet is loaded, I have the biggest nightmare imaginable to get the browser to load a new version after I have updated it. And trust me, there is not and old version of the applet.class in my ClassPath. In fact there is not another copy of the applet.class file anywhere on my PC. I made sure. I have also disabled the Java Plugin Cache option, and deleted my temporary internet files with Explorer. But the thing persists in loading the old version from somewhere. What the heck do I do? I fear this is driving me insane.. :)
Problem 3) I need the HTML components to interact with the applet.
When I do a call to an applet function passing no parameters it works fine, and I get the value back, like this:
<SCRIPT LANGUAGE="VBScript">

</SCRIPT>
But when I do a function call, passing parameters, the scrip just stops working altogether, like this.
<SCRIPT LANGUAGE="VBScript">

</SCRIPT>
Why is this. What am I doing wrong.
And better yet... Is there a way of manipulating the HTML components from within JSP scriplet <% ... %>?
Please if anyone can help... It will be greatly appreciated. I am at a loss!
Thanx. Quigrim

Quigrim wrote:
Problem 1) I can only get the applet loaded if the applet class file
is in the same folder as the JSP file. Anything else, and I get a
ClassNotFoundException. Can't get the CODEBASE to do anything for me
at all.Set CODEBASE to point to the relative directory where your code is. If it is in the same directory as the JSP then CODEBASE="."; if it is in a sub-directory 'classes' then CODEBASE="classes".
Problem 2) Once this applet is loaded, I have the biggest nightmare
imaginable to get the browser to load a new version after I have
updated it. Close ALL browser windows - you have to force the plugin JVM to re-initialise - I've not found any other way to do it.
Hope these help you.
Phil.

Process Monitor Diagram Applet in JSP

Has anyone experienced to use Java Applet in JSP to display the process diagram, just as what you can see in the workflow console. I notice that WF_MONITOR has a getMonitorURL() API which returns a link that leads to Workflow Console, I feel this isn't user friendly. If I could bring what user exactly sees the process diagram in workflow console to Java JSP, it would be superb ...........
any idea?
Kun

All I can think of is that you are using swing and
including the necessary files via import statements in
the code. This might cause the applet to run fine with
the default Netscape JVM. On the other hand, when
using the jsp:plugin tag the browser is instructed to
download the Java2 plugin regardless of whether the
applet will run or not. What I'm saying is that you
probably don't have the Java2 plugin installed on your
browser rather you have the necessary jar files in
your classpath to support Java2. Does that make any
sense?>
CliffI don't have a shell CLASSPATH variable, and I'm not sure how to tell what CLASSPATH variable Netscape is using.
The applet doesn't use Swing as far as I can tell, the code for this applet is at
http://tmap.pmel.noaa.gov/~callahan/JAVA/map_v3.0/LiveMap_30.java.
It appears to use only awt for imaging, which I think is considered Java1.
A bit off topic:
I have the javaplugin.so which ships with jdk1.3.1_01. However when I look under Edit->Preferences->Navigator->Applications and try to set the plugin used for application/x-java-applet I see that the setting is one for "Unknown - prompt user". Also if I look under Edit->Preferences->Advanced I can see that "Enable Java" is checked and activated but "Enable Java Plugin" is not checked and unavailable (it is greyed-out).
1) How can I get Netscape to "know about" the plugin I have available in my JRE ?
2) How can I tell Netscape to use this plugin for all things Java ?
3) How is it that the applet runs fine when included in a HTML page, even though it appears that my browser's application settings aren't set up to handle applets correctly ?
4) The Netscape Edit->Preferences->Advanced shows that Java is enabled but the plugin is not. I guess I'm missing something here as I thought that the Java plugin was required for anything Java related to run (such as applets) but this is obviously not so since the applet will run fine if coming from the HTML page.
A bit perplexed...
-James

How to run the applet in JSP

hi,
im trying to run an applet from JSP i am not able to see the output of the applet on the JSP page?
<APPLET CODE="com.metro.supex.admin.SampleApplet.class" HEIGHT="25" WIDTH="125" ALIGN="bottom"></APPLET>
this line of code is included in JSP to run the applet, it is giving error
java.lang.ClassNotFoundException:com.metro.supex.admin SampleApplet
please can you help me in this matter.

And don't use the applet tag, use object embed.
use the htmlconverter in the jdk bin dir to convert an applet tag.

Including applets in JSP - problem!!

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