Reading need help though Class not found

Hi, I normally search the forums before posting but I need some points cleared up
What version of JDK does IE ship with? Since the depricated size().getHeight() is only supported and not the newer version.
This isnt my real question though. MY applet which only uses a canvas, hashmap, arraylist, sockets and a couple of other things does not work :-(
IE claims it cannot find the HASHMAP class. Ive used full qualifers shown below and the html called. Can someone tell me how to solve this problem pls?
I have also read about using a .JAR file with all my bits in it. How do i create this and use it?
Thanks people
// A hashmap allows for a key and an object. Should aid speed
private java.util.HashMap m_hashmap = new java.util.HashMap(400, (float)0.75);
<HTML>
<APPLET
CODE=mainApp.class width=800 height=600>
<param name="bgColour" value="255,255,255">
<param name="host" value="nutcracker">
<param name="port" value="23">
</APPLET>
</html>
Error msg
ava.lang.ClassNotFoundException: java.util.HashMap
     at com/ms/vm/loader/URLClassLoader.loadClass
     at java/lang/ClassLoader.loadClassInternal
     at InternalDataStructures.<init>

The plugin is in fact a virtual machine that runs your applet. When a browser hits a page that requires use of a plugin that's not installed yet, there will be a prompt to download it. Once it's installed the plugin will take control and load your classes from the internet and the load the API classes you need from its own rt.jar, located locally. The only slowdown may be the initial bringing up of the VM.
Also note that the latest versions of many browsers like opera and netscape begin to ship with the plugin; no need to download anything.
Can I not package up the classes in my own JAR?Of course you can, but there may be some legal points that I'm not aware of... In total, the plugin would be the best solution for everyone (you're not the only one writing applets, are you :) but because of its download size your users may appreciate you extracting the needed few kilos from rt.jar ;)

Similar Messages

HELP!! Nokia's API classes not found with j2me WTK

I setup j2me WTK, jdk1.4.2 and also Nokia's SDK (Series_60_MIDP_SDK_for_Symbian_OS_v_1_2_1) on my Win NT 4.0 machine.
J2ME samples (shipped with it) are working fine with ktoolbar. but when i try to build & run nokia samples, they are always giving error "FullCanvas class not found" and "package com.nokia.lcd.ui.* not found". I am sure it is the problem of placement of classes of nokia at correct place inside j2me's WTK. However, i followed the guidelines to install symbian sdk inside wtk401\wtklib\devices folder (as per instructions of forum nokia). But i am still not able to get it running. Any expert suggestions, then plz respond me , i am in urgent need to solve this issue!!!! plz help me!!!!

Hi,
Maybe I'm being thick but I can't get this work. I've tried zipping the com/nokia stuff into the midpapi.zip. And I've tried just replacing midapi.zip with classes.zip from the nokia emulator. But it still says:
"package nokia.mid.ui does not exist
import nokia.mid.ui.*;"
I'm using ktoolbar 1.04.
Many thanks!
CP
Hey, thanks for the great tip. Was also using
KToolbar because it runs faster on my slow laptop than
Sun One studio.
With the later version of WTK, the paths
C:\...\WTK21\lib contains 2 files, midpapi20.zip and
midpapi10.zip
The later contains classes for compiling to MIDP1.0
standard. I think most people use this. Replace it
the class.zip in
C:\Nokia\Devices\Nokia_7210_MIDP_SDK_v1_0\lib if
you're using the same SDK as I am, and don't forget to
rename it.
Cheers.

Class not found because browsers need newer runtime environment - or this

For all who are experiencing the same problem!
Problem:
You're compiling your applets with a quiet modern compiler (i.e. Netbeans Version 3.5.1)
You are able to compile your applets without any problems but if you try your applets in "real life", the browsers can't interpret your applets [class not found]. (I tested Internet Explorer 6.0 and Netscape Navigator 4.7)
So you need a plugin for the new JAVA environment because the JAVA environment of the browser is older than that which the applet needs.
Well, you have the choice to demand to every user of your applet to download the new Java Runtime Environment, but then don't wonder why nobody visits your site!
But, don't worry: I figuered out another solution, that Netbeans (www.netbeans.org) allows to compile in different JAVA versions.
Solution:
What you have to do is:
- Install a previous version of JDK (i.e. JDK 1.3 - I would suggest, lower versions don't work with Netbeans 3.5.1 and JDK 1.3 is enough for IE 6.0 and NN 4.7, which I tested)
- Go into the "bin"-directory of Netbeans (i.e. c:/netbeans3.5.1/bin)
- Open the file "ide.cfg" (with notepad or any other texteditor)
- You see a line like: jdkhome "C:\java\j2sdk1.4.2" -J-Xmx96m -J-Xss1024k -J-Xms24m -J-Xverify:none
- Change the path to your other JDK you wish, like: jdkhome "C:\java\jdk1.3" -J-Xmx96m -J-Xss1024k -J-Xms24m -J-Xverify:none
- That's it, you can compile your applets in a previous version of JAVA so that "older" browser user don't have to install a plugin for the new JAVA environment.
Have fun!
If you have any questions I would be pleased to help you.
If this tip helped you already I would be pleased if you would send me a quick email with your experience.
My email: [email protected]

That's very good to know of course, but correct me if I am wrong with saying that Java development not
limited to NewBeans or any other IDE use.
If somebody wants to deploy the applets within browser built-in JVM (which is really outdated and just
Java 1.1.6 compliant) he or she should compile applet with Java 1.1.8 (still available from SunMicrosystems). Generated classes will be recognized by both Netscape and IE.
Regards.

APPLET.class not found error on explorer!! need solution URGENTLY!!!

Hi,
I am calling my applet from a jsp and trying to run it on the internet explorer but I am getting the following error:
load: class /WEB-INF/classes/Log/LogApplet.class not found.
java.lang.ClassNotFoundException: .WEB-INF.classes.Log.LogApplet.class
My Explorer version is 6.0 and I am using Plug-in: Version 1.4.1_05. Why do you think it cannot find the class? it is located under the specified directory which is:
/Web Content/WEB-INF/classes/Log/LogApplet.class
and my jsp which is calling my applet is located under:
Web Content/Login.jsp
this is a very urgent problem!! could you please help me? I will appreciate your help so much.
Thanks,
Sofia
here is how I wrote my jsp:
<jsp:plugin type="applet"
code="/WEB-INF/classes/Log/LogApplet.class"
width="600"
height="620"
>
<jsp:params>
</jsp:params>
<jsp:fallback>
<p>Unable to start plugin.</p>
</jsp:fallback>
</jsp:plugin>
...

I'm having the same problem...however my applet is located outside of the web-inf folder. the web-inf folder is only for servlets. applets can't be recognised inside it since that folder is for server-side application while applets are meant for client-side.
i put my applet into a separate folder in the root directory of the webapp but it's generating a security error when i call it using a jsp page. so far the only way i got around it was specifying the entire codebase using localhost...but it's not a pretty good way of doing it.
any ideas anyone?

Rmic Class not found is worrying me--Help

Hi guys I want to know if win200 prof and JDK1.3.1_01 are not friendly.
When I run javac *.java in the dir c:\test\java\agent, it compiles fine, but When I run
rmic AgentImpl
I get AgentImpl class not found error
Now I tried this:
C:\>rmic -d <c:\test> -classpath".;c:\jdk1.3.1_01\bin;c:\test\java\agent " test.java.agent.AgentImpl
and got Access is denied.
Can someone help pls
Joe

Someone pls help on the RMIC comple problem as per below

I am running Mac OS 10.6.7 I cannot run a java based program from the net when parental controls are set the error is The error is Load: class installer.CheckVersion 13. class not found Help!

I am running Mac OS 10.6.7 I cannot run a java based program from the net when parental controls are set the error is The error is Load: class installer.CheckVersion 13. class not found

Then, talk to the person running the lab.

Class not found error on Firefox browser

Requirement:-
We have Apache server on the top of a tomcat container where we have deployed application Webnow. This application will provide SSO to another application Imagenow. The requirement is we have to authenticate and authorize a user based on the client certificate which will be installed on the client side browser.
Issue:-
We have achieved the requirement for the browser IE. But for browser Firefox ,we are getting an exception "Class not found". Basically an applet class from the jar is not getting loaded on the Firefox.
Further investigating on this we came to conclusion that Firefox is not able to read the SSL certificate.
In order to eliminate this, we have imported the client certificate in java console as well. After this step, we were not getting "ClassNotFoundException" in FF. But right now, user is getting prompted for certificate/keystore password each & every time while trying to login onto the application (both in IE & FF).
So, we are trying to find ways to remove class not found exception without importing client certificate to java console. Also , is there any way to eliminate the authentication pop up for keystore (though we might not go for this approach as it will be very difficult to manage Java console for end users). Need your urgent help on this issue.
Attaching stack trace of both the browser and screenshot of keystore authentication pop-up . FF_Issue_stacktrace.docx is one when we were getting "class not found exception" and IE_Stacktrace.docx is one for successful case.

We have a similar set up where we have a web app and an applet in a JSP page. You have to put your applet classes up above WEB-INF. So, if your structure for your webapp was:
tomcat/webapps/mywebapp
you'd want your classes under mywebapp instead of webapps/mywebapp/WEB-INF. In your case, if I read your package structure right, you'd want a Log directory under webapp that contains your LogApplet.class file.
I hope this works for you!

Class not found error for applet.

This is probally a really simple mistake but I've tried everything and can't find it.
My applet works fine with applet viewer - I'm running it from JBuilder. But when I open my html file in the browser it gives me a 'Class not found' error. I've tried running other applets (my own and demos on this site) and they work fine.This is the applet tag code:
<applet code = "Rotary.class" width = "650" height = "580" align = "top">

<param name = "sector0" value ="234,215,244,207,154,43,125,63">
</applet>
The class file is in the same directory as the HTML file. Do I need to specify the codebase? I tried that too - giving it the full pathname of the class.
In the Java console it said that it couldn't find "C:Project\Rotary\javax\swing\japplet"
I don't think it could have anything to do with the fact that I'm using swing because the other applets I used used swing.
Please help - I'm really running out of ideas here!

You have a similar problem like I had.
You seem to have a too old JAVA environment for the browser - I had a too new environment.
For all who are experiencing the same problem!
Problem:
You're compiling your applets with a quiet modern compiler (i.e. Netbeans Version 3.5.1)
You are able to compile your applets without any problems but if you try your applets in "real life", the browsers can't interpret your applets [class not found]. (I tested Internet Explorer 6.0 and Netscape Navigator 4.7)
So you need a plugin for the new JAVA environment because the JAVA environment of the browser is older than that which the applet needs.
Well, you have the choice to demand to every user of your applet to download the new Java Runtime Environment, but then don't wonder why nobody visits your site!
But, don't worry: I figuered out another solution, that Netbeans (www.netbeans.org) allows to compile in different JAVA versions.
Solution:
What you have to do is:
- Install a previous version of JDK (i.e. JDK 1.3 - I would suggest, lower versions don't work with Netbeans 3.5.1 and JDK 1.3 is enough for IE 6.0 and NN 4.7, which I tested)
- Go into the "bin"-directory of Netbeans (i.e. c:/netbeans3.5.1/bin)
- Open the file "ide.cfg" (with notepad or any other texteditor)
- You see a line like: jdkhome "C:\java\j2sdk1.4.2" -J-Xmx96m -J-Xss1024k -J-Xms24m -J-Xverify:none
- Change the path to your other JDK you wish, like: jdkhome "C:\java\jdk1.3" -J-Xmx96m -J-Xss1024k -J-Xms24m -J-Xverify:none
- That's it, you can compile your applets in a previous version of JAVA so that "older" browser user don't have to install a plugin for the new JAVA environment.
Have fun!
If you have any questions I would be pleased to help you.
If this tip helped you already I would be pleased if you would send me a quick email with your experience.
My email: [email protected]

Class not found error for COM.ibm.db2.jdbc.app.DB2Driver

i have written this code:
import java.io.*;
import java.sql.*;
public class tryjdbc
{ public static void main (String args[])
{ try
{ Class.forName("COM.ibm.db2.jdbc.app.DB2Driver"); }
catch (java.lang.ClassNotFoundException e)
{ System.out.print(e.getMessage()); }
and once i try to run it, it gives out a class not found exception error.
I haven't changed anything with the classpath since I don't think the problem is with the classpath. I have read in the IBM Developer Kit for Java documentaton that the AS/400 Developer Kit for Java automatically adds the db2_class.jar file to the classpath. So why do I get a class not found exception error?

I was using Web Spehere 4.0.3 and trying to connect to a database on DB2 7.2. I was just following a tutorial and trying to get a handle on Web Sphere. I am running all of these on a Windows 2000 Operating System. Here are some of my observations :
a. db2java.zip packaged under %DB2ROOT%\SQLLIB\JAVA, does not work.
b. CLASSPATH needs to be set to %DB2ROOT%\sqllib\java12\db2java.zip
c. Include this as one of the packages in the package defined in
WebSphere, using the Java Perspective.
d. Ensure that case sensitivity is respected. All though the package
shows up as COM.ibm.db2.jdbc.app.DB2Driver, for some reason, it
will only accept com.ibm.db2.jdbc.app.DB2Driver.
With these settings, I was able to connect to a db2 database.
I am a little puzzled on the following. I did not include java.io package, but still it could print the messages. Did anybody have a similar experience
Thanks for this posting.

JSP-class not found

My server already working properly in internet.It's a travel agent site.there after i include one more page for audio guide which is JMF with in the applet and it is plugin to my jsp page.It's work very fine in my local system.my server is Tomcat .But if i hosted to our server means it's giving applet class not found exception.
It is already having com package ,now i include my jmf package wol to it.
My root directory of this class file is
web-inf/classes/wol/PlaySongs.class
My server doesn't have JMF pack so,i just copy JMF.jar and Sound.jar to my web-inf/lib/ folder.and also to my server folder like tomcat/common/lib/ .Now i restart my server it's giving applet class not found exception.but it's working fine in local system.
I have using following jsp code.
<body>
<%
String fname = "file:" + request.getRealPath("AudioF") + "/button-1.mp3";
%>
<jsp:plugin type="applet" code="PlaySongs.class" codebase="/wol" width="300" height="20">
<jsp:params>
<jsp:param name="file" value="<%=fname%>" />
</jsp:params>
<jsp:fallback>
<p> Unable to start Plug-in. </p>
</jsp:fallback>
</jsp:plugin>Any one help me.
Regards
K.Suresh

the codebase should be a path into the webdir, not the WEB-INF dir. Your browser needs to be able to reach the applet class like any other resource.
My server doesn't have JMF pack so,i just copy JMF.jar and Sound.jar to my web-inf/lib/ folder.and also to my server folder like tomcat/common/lib/If you are already copying it to your common/lib folder, you don't need it in the lib folder of your webapp.

WSIF - BaseFacade.class not found

Hi,
I need your help:
I create a web service using WSIF to access java class method.
1. when I compile the service with obant utility, everything is working fine
2. When I compile the service in BPEL Designer, I have the following message:
[javac] Compiling 2 source files to D:\orabpel\system\classes
[javac] D:\MyWork\BPEL_workspace\MySyncBusinessProcess\src\com\oracle\cyryl\employee\EmployeeWSIF.java:26: cannot access com.collaxa.cube.xml.BaseFacade
[javac] file com\collaxa\cube\xml\BaseFacade.class not found
How to configure BPEL Designer to compile the service?
In advance, thanks for your help,
Cyryl

Hi
Hope this can be of some help:
http://bpeleclipse.blogspot.com/2006/04/facade.html
^_^

Servlet class not found error deploying a WAR on Web Logic Server 8.1

I'm re-deploying an updated web application to a web logic server, but when I navigate to the login page of the web application to test it, I get a class not found error for my login servlet. I have both the web.xml and the weblogic.xml descriptors in my WEB-INF directory, and all of my compiled classes are in the WEB-INF/classes directory, is there something else I'm missing? Any help would be much appreciated.

Thanks for the response. Here's the web.xml file:
<?xml version="1.0" ?>
<!DOCTYPE web-app PUBLIC "-//Sun Microsystems, Inc.//DTD Web Application 2.3//EN" "http://java.sun.com/dtd/web-app_2_3.dtd">
<web-app>
<display-name>Web Forms</display-name>
<servlet>
<servlet-name>LoginServlet</servlet-name>
<display-name>LoginServlet</display-name>
<servlet-class>LoginServlet</servlet-class>
</servlet>
<servlet>
<servlet-name>ChangePasswordServlet</servlet-name>
<display-name>ChangePasswordServlet</display-name>
<servlet-class>ChangePasswordServlet</servlet-class>
</servlet>
<servlet>
<servlet-name>LogoutServlet</servlet-name>
<display-name>LogoutServlet</display-name>
<servlet-class>LogoutServlet</servlet-class>
</servlet>
<servlet>
<servlet-name>PageServlet</servlet-name>
<display-name>PageServlet</display-name>
<servlet-class>PageServlet</servlet-class>
</servlet>
<servlet>
<servlet-name>UploadServlet</servlet-name>
<display-name>UploadServlet</display-name>
<servlet-class>UploadServlet</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>LoginServlet</servlet-name>
<url-pattern>/LoginServlet</url-pattern>
</servlet-mapping>
<servlet-mapping>
<servlet-name>ChangePasswordServlet</servlet-name>
<url-pattern>/ChangePasswordServlet</url-pattern>
</servlet-mapping>
<servlet-mapping>
<servlet-name>LogoutServlet</servlet-name>
<url-pattern>/LogoutServlet</url-pattern>
</servlet-mapping>
<servlet-mapping>
<servlet-name>UploadServlet</servlet-name>
<url-pattern>/UploadServlet</url-pattern>
</servlet-mapping>
<servlet-mapping>
<servlet-name>PageServlet</servlet-name>
<url-pattern>/PageServlet</url-pattern>
</servlet-mapping>
<welcome-file-list>
<welcome-file>Login.jsp</welcome-file>
</welcome-file-list>
</web-app>
None of the classes are in a package (I know it's not the best idea, but I didn't write these, I'm just doing some updates). So the file structure is pretty much just WEB-INF/classes/
At the moment I've got a fix by just putting the entire project (not in any sort of archive) on the server itself instead of deploying it as a WAR, any thoughts on why the WAR isn't working would be much appreciated though.

Class Not Found instantiating IP

[Portal 4.0 on WLS 6.1 on Win2K... ]
I'm getting 'Class Not Found' when instantiating my IP class. The only way I can
work around it is to put "WEB-INF/classes" in the startup classpath, which makes
it not re-deployable.
I've read newsgroups/docs extensively and believe that:
* IPs (as opposed to PCs) are scoped to the web app, not to the enterprise app
* For web apps, the WEB-INF/classes (for exploded files) and WEB-INF/lib (for
Jar'd files) should be 'auto-included' in the classpath, hence the classloader
that portal is using for IP instantiation should find my class...
But that's not what's happening... so where is my understanding faulty and, more
importantly, how can I make portal find my IP class and still have it be hot redeployable?
Thanks in advance,
Mike

Hi,
We actually use a third approach, which is: package your pipeline components
with a dummy EJB into a separate JAR (unless you programmed the actual EJBs
which you want to package with your PCs) and deploy as a separate component
to your enterprise app.
We include pipeline.jar and p13n_util.jar into the classpath in the ANT
script only. WLP starts without these jars in the class path with no
problems.
Just for a reference: we use WLS 6.1 sp2, WLP 4.0 sp2.
Best regards,
Michael Goldverg
"Peter Laird" <[email protected]> wrote in message
news:3db4de07$[email protected]..
>
Mike,
"The set-environment.bat had been modified to include the WEB-INF/classesunder
the 'sandbox dir' in the classpath. I'm confident removing theseclasspath elements
is the right thing to do; I no longer get the 'class ... can not bedeployed'
messages, which was my original problem."
Yes, putting anything in the enterprise application or the web applicationin
the system classpath is not a good idea.
"So, the (very cool & useful) diag tool"
Glad you like it! I wrote that a year ago, and it has helped me onnumerous occasions.
Whenever you have a classloader problem, this thing works magic.
" 'You need to either put your PC in pipeline.jar or reference your ownJAR from
the pipeline.jar's classpath entry in its manifest.' I'm not sure Iunderstand
this. Are we really expected to modify BEA supplied JAR files?"
Regretably, yes. There have been several ideas on a better solution, butit hasn't
found its way into the product yet. Until that happens, the secondapproach (changing
the manifest classpath entry) is the preferred approach.
"Thank you *very* much for your help!"
I'm happy to help!
PJL

Class jreVerify.class not found

My Java is not working correctly. Below are the details. If anyone can help . . . pleeeeeze!
Thank you.
Java Plug-in 1.6.0_21
Using JRE version 1.6.0_21-b07 Java HotSpot(TM) Client VM
c: clear console window
f: finalize objects on finalization queue
g: garbage collect
h: display this help message
l: dump classloader list
m: print memory usage
o: trigger logging
q: hide console
r: reload policy configuration
s: dump system and deployment properties
t: dump thread list
v: dump thread stack
x: clear classloader cache
0-5: set trace level to <n>
load: class jreVerify.class not found.
java.lang.ClassNotFoundException: jreVerify.class
     at sun.plugin2.applet.Applet2ClassLoader.findClass(Unknown Source)
     at sun.plugin2.applet.Plugin2ClassLoader.loadClass0(Unknown Source)
     at sun.plugin2.applet.Plugin2ClassLoader.loadClass(Unknown Source)
     at sun.plugin2.applet.Plugin2ClassLoader.loadClass(Unknown Source)
     at java.lang.ClassLoader.loadClass(Unknown Source)
     at sun.plugin2.applet.Plugin2ClassLoader.loadCode(Unknown Source)
     at sun.plugin2.applet.Plugin2Manager.createApplet(Unknown Source)
     at sun.plugin2.applet.Plugin2Manager$AppletExecutionRunnable.run(Unknown Source)
     at java.lang.Thread.run(Unknown Source)
Caused by: java.io.IOException: open HTTP connection failed:http://java.com/jsp_utils/jreVerify/class.class
     at sun.plugin2.applet.Applet2ClassLoader.getBytes(Unknown Source)
     at sun.plugin2.applet.Applet2ClassLoader.access$000(Unknown Source)
     at sun.plugin2.applet.Applet2ClassLoader$1.run(Unknown Source)
     at java.security.AccessController.doPrivileged(Native Method)
     ... 9 more
Exception: java.lang.ClassNotFoundException: jreVerify.class

More details are needed. How applet is deployed (post html snippet and JNLP if you use JNLP).

Errors with CF 8.0.1 hotfix 3 and hotfix 4, "Object Instantiation Exception.Class not found"

We need to get our servers up to date with the latest ColdFusion hotfixes in order to pass our security scans and policies. We have been following the Adobe instructions for installing the hotfixes, but we’re getting the same errors each time. The CF 8 hotfix 2 works fine, but once we install hotfix 3 and/or hotfix 4, we get the following errors:
"Object Instantiation Exception.Class not found: coldfusion.security.ESAPIUtils The specific sequence of files included or processed is: C:\ColdFusion\wwwroot\WEB-INF\exception\java\lang\Exception.cfm, line: 12 "
coldfusion.runtime.java.JavaObjectClassNotFoundException:
We have dozens of servers running Windows XP, Netscape Enterprise Server 6.1 (I know, don’t laugh), ColdFusion 8,0,1,195765, and Java Version 1.6.0_04. Just about the only good thing about running XP on our servers is that it matches our development boxes, so we have almost mirrored environments for dev, test, and production. We do NOT have the CF install with the J2EE configuration.
The crazy thing is, on tech note 51180 (http://kb2.adobe.com/cps/511/cpsid_51180.html), it says that the fix for bug # 71787 (Fix for "Object Instantiation Exception" thrown when calling a Java object constructor or method with a null argument under JDK 1.6.) was added in cumulative hotfix 2. However we don’t see this problem until we go to hotfix 3 (or 4).
I’ve also been reading that other people had this same problem, and that the CF 8 hotfix 3 was not compatible with certain versions of JDK, then when you read the Adobe site for CF 8.0.1 hotfix 3, it says “Added the updated cumulative hotfix to make it compatible with jdk 1.4.x, 1.5.x and 1.6.x.”, so that makes me think that Adobe was supposed to have fixed this CF 8.0.1 hotfix 3 JDK incompatability issue - but unfortunately it's still not working for us. We have followed the instructions for removing the jar files and starting/restarting the CF server as directed, we’ve tried this 5-6 times, and still no luck.
Recommendations? Seems like this is a ColdFusion bug to me – one that says is fixed on the Adobe site, but is not fixed in our environment. Please advise, thanks.

For what it's worth, we had an MXUnit user describe a similar, though not identical, problem after installing the latest hotfixes. In his case, he's getting "NoSuchMethodExceptions".

Reading need help though Class not found

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