Problem finding class?

So, I am trying to load an applet in a web page using:
<applet archive="https://www.foo.com.my.jar"
code="com.foo.example.my.class"
width="450" height="150">
</applet>
But I get:
java.lang.ClassNotFoundException: com.foo.example.my.class
However, if I open up the jar com\foo\example\my.class is clearly there, along with my$1.class, my$2.class, etc.
I exported this jar from Eclipse using Export -> JAR file.
Any thoughts on what might be going on?

Specify one of the following:
com.foo.example.my
or
com/foo/example/my.class

Similar Messages

Problem finding class in jar file

I have an applet that will run when I have all the classes sitting in the same directory. ex) http://IPaddress/directory. But I try to put them all into a jar file and run the code and it says cant find the class. Below is my html code. Please help!
<HTML>
<HEAD>
</HEAD>
<BODY>
<APPLET
CODEBASE="http://IPaddress/directory1/directory2"
CODE="Applet.class"
ARCHIVE="1stJar.jar,2ndJar.jar,3rdJar.jar,Applet.jar"
WIDTH=600 HEIGHT=600>
</APPLET>
</BODY>
</HTML>

Where are your jar files contained? They need to be in the same directory as your CODEBASE, or otherwise include a relative directory.
Also, what browser are you using?
From the Java web page on APPLET tags
"Unfortunately, not all browsers understand the same archive format or use the same HTML code to specify the applet archive"

Problems Finding Class

Hello,
I apologise if this is a fairly basic question, but I require assistance.
I have moved alot of code into various utility classes to avoid repetition of code in my JSP pages.
On my development system everything works as it should, however when I migrate all my code to a new unix system I get the follwing error message.
org.apache.jasper.JasperException: Unable to compile class for JSP
and it says it can't find my classes, which live under WEB-INF/classes/web.utils.db.MYCLASS
Can anyone help ?
Is there someplace I need to set a classpath?
Any help would be greatfully recieved.
Many Thanks
Les,

Apologies I thought this might be a simple one.
When we did the migrate WEB-INF was being converted to (web-inf)lower case and hence the reason for the classes not being found.
Thanks Again
Les,

Problems finding classes in weblogic

Hi, I'm trying to package under the EAR an EJB and a WAR... but when i try to perform an action i get:
java.lang.ClassNotFoundException: this.is.MyActionClass at weblogic.utils.classloaders.GenericClassLoader.findLocalClass(GenericClassLoader.java:297) at weblogic.utils.classloaders.GenericClassLoader.findClass(GenericClassLoader.java:270) at java.lang.ClassLoader.loadClass(ClassLoader.java:306) at java.lang.ClassLoader.loadClass(ClassLoader.java:247) at weblogic.utils.classloaders.GenericClassLoader.loadClass(GenericClassLoader.java:179) at java.lang.Class.forName0(Native Method) at java.lang.Class.forName(Class.java:169) at ....
here this.is.MyActionClass is in my WAR. all my action classes are in my WAR, nothing in EJB so I don't see how this would be running with EJB jars not finding my WAR, i also tried setting +<prefer-web-inf-classes>trueprefer-web-inf-classes>+ and rebuild, restarting the server, cleaning cache, it didn't work either. What other options do I have?
Any suggestions?
Thanks.

Hi Malky,
java.lang.ClassNotFoundException: this.is.MyActionClass --> This is because weblogic cant find the specific class in your classpath.
Try placing the class path in the web-inf folder inside the war file.
Other options
If you want to set the CLASSPATH for all the managed Servers available in your Domain then "$DOMAIN_HOME/bin/setDomainEnv.sh" has an Environment variable with name "PRE_CLASSPATH" which is usually preferred for Patches or any JAR which we want to override from the WebLogic's existing classpath.
But if you don;t want to override WebLogic's default CLASSPATH rather include your Jars in it then please add your JAR filenem including absolute path inside the "POST_CLASSPATH" variable inside "$DOMAIN_HOME/bin/setDomainEnv.sh"
Apart from this another option will be putting your Jars inside the "$DOMAIN_HOME/lib" directory because The jars located in this directory will be picked up and added dynamically to the end of the server classpath at server startup. The jars will be ordered lexically in the classpath. The domain library directory is one mechanism that can be used for adding application libraries to the server classpath. It is possible to override the $DOMAIN_DIR/lib directory using the -Dweblogic.ext.dirs system property during startup. This property specifies a list of directories to pick up jars from and dynamically append to the end of the server classpath using java.io.File.pathSeparator as the delimiter between path entries.
If you are starting your Managed Servers using NodeManager then please refer to the following Article.:
Topic: Nodemanager Based ManagedServers setting MEM_ARGS
http://middlewaremagic.com/weblogic/?p=780
Regards
FAbian

Problem finding class MySql

If i run this code I have an Exception like this:
Exception: com.mysql.jdbc.Driver
why? what I have to do?
package com.stardeveloper.example;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.SQLException;
public class JdbcExample2 {
public static void main(String args[]) {
Connection con = null;
try {
Class.forName("com.mysql.jdbc.Driver").newInstance();
con = DriverManager.getConnection("jdbc:mysql:///test",
"root", "secret");
if(!con.isClosed())
System.out.println("Successfully connected to " +
"MySQL server using TCP/IP...");
} catch(Exception e) {
System.err.println("Exception: " + e.getMessage());
} finally {
try {
if(con != null)
con.close();
} catch(SQLException e) {}
}

I found a jar file and its name is
mysql-connector-java-3.1.7-bin.jar Is it the right
one?
Where have I to put it?Wherever it is, add it to your CLASSPATH. :)If you have a project called MyApp, you can arrange things like this:
(1) Have a directory under MyApp named /java; put your .java files in there, arranged in their package structure,
(2) Have a directory under MyApp named /lib; put your JARs in there.
When you compile your .java files, write the output to a directory called /classes.
You add your JARs to the CLASSPATH using the -classpath option on javac.exe and java.exe. Do not use a system CLASSPATH environment variable.
%

Unable to find class oracle.panama.personalization.login

oracle.jsp.parse.JspParseException: Line # 21, Error: Unable to find class for bean: login defined by tag with class: oracle.panama.personalization.login
I get this message when trying to go to "http://{hostname}/papz/login.jsp"
window 2k, Oracle 8.1.7, 9iASwe 1.0.2.0.0.
Any help would be great.
Thanks in advance
Sean.

I'm also having this problem. Could really use some help

Cannot find class in same package but in different file

I have following two source files. Both the file has same package statement as below
package java.buron.doeacc ;
But whenever i try to compile File: shoepolish.java ( mainfram.java compiled succesfully before)
following error message appear
..\..\buron\doeacc\shoepolish.java:12: cannot resolve symbol
symbol : class MainFrame
location: class java.buron.doeacc.shoepolish
          MainFrame mainFrame = new MainFrame();
^
..\..\buron\doeacc\shoepolish.java:12: cannot resolve symbol
symbol : class MainFrame
location: class java.buron.doeacc.shoepolish
          MainFrame mainFrame = new MainFrame();
^
Please tell me What is the problem and how it can be solved.
why cannot find the class that are in same package.
I have JDK 1.3
FOLLOWING ARE THE TWO FILES
File: mainframe.java/////////////////////////////////////////////////////////////////////
package java.buron.doeacc ;
import javax.swing.* ;
import java.awt.*;
import java.awt.event.* ;
class MainFrame extends JFrame
     private final String APP_NAME = "Shoe Polish";
     // constructor
     public MainFrame()
          super("Shoe Polish");
          setSize(500, 500);
          setVisible(true);
File : shoepolish.java
package java.buron.doeacc ;
import java.io.* ;
import java.buron.doeacc.* ;
class shoepolish
     public static void main(String args[])
          MainFrame mainFrame = new MainFrame();

The javac compiler uses the Classpath to find classes. If your directory structure is c:\myjava\buron\doeacc (for example) then you need to have c:\myjava in the Classpath when you compile. For example javac -classpath c:\myjava MainFrame.java

Can't find class org/apache/jk/apr/AprImpl

Hi
I have Tomcat 4.1.29 and Apache Web Server 2.0.48 installed.
I have used this tutorial since I'm a newbie :(
http://www.gregoire.org/howto/Apache2_Jk2_TC4.1.x_JSDK1.4.x.html
My problem is when I try to regroup them, I obtained this error error.log.
error] Can't find class org/apache/jk/apr/AprImpl
java.lang.NoClassDefFoundError: javax/management/MBeanRegistration
     at java.lang.ClassLoader.defineClass0(Native Method)
     at java.lang.ClassLoader.defineClass(Unknown Source)
     at java.security.SecureClassLoader.defineClass(Unknown Source)
     at java.net.URLClassLoader.defineClass(Unknown Source)
     at java.net.URLClassLoader.access$100(Unknown Source)
     at java.net.URLClassLoader$1.run(Unknown Source)
     at java.security.AccessController.doPrivileged(Native Method)
     at java.net.URLClassLoader.findClass(Unknown Source)
     at java.lang.ClassLoader.loadClass(Unknown Source)
     at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)
     at java.lang.ClassLoader.loadClass(Unknown Source)
     at java.lang.ClassLoader.loadClassInternal(Unknown Source)
     at java.lang.ClassLoader.defineClass0(Native Method)
     at java.lang.ClassLoader.defineClass(Unknown Source)
     at java.security.SecureClassLoader.defineClass(Unknown Source)
     at java.net.URLClassLoader.defineClass(Unknown Source)
     at java.net.URLClassLoader.access$100(Unknown Source)
     at java.net.URLClassLoader$1.run(Unknown Source)
     at java.security.AccessController.doPrivileged(Native Method)
     at java.net.URLClassLoader.findClass(Unknown Source)
     at java.lang.ClassLoader.loadClass(Unknown Source)
     at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)
     at java.lang.ClassLoader.loadClass(Unknown Source)
     at java.lang.ClassLoader.loadClassInternal(Unknown Source)
Here is my confid file (workers.properties) :
[logger]
level=DEBUG
[config:]
#file=C:/Apache2/conf/workers2.properties
file=C:/Apache2/conf/workers2.properties
debug=0
debugEnv=0
[uriMap:]
info=Maps the requests. Options: debug
debug=0
# Alternate file logger
#[logger.file:0]
#level=DEBUG
#file=C:/Apache2/logs/jk2.log
[shm:]
info=Scoreboard. Required for reconfiguration and status with multiprocess servers
file=C:/Apache2/logs/jk2.shm
size=1000000
debug=0
disabled=0
[workerEnv:]
info=Global server options
timing=1
debug=0
# Default Native Logger (apache2 or win32 )
# can be overriden to a file logger, useful
# when tracing win32 related issues
#logger=logger.file:0
[lb:lb]
info=Default load balancer.
debug=0
#[lb:lb_1]
#info=A second load balancer.
#debug=0
[channel.socket:localhost:8009]
info=Ajp13 forwarding over socket
debug=0
tomcatId=localhost:8009
#[channel.socket:localhost:8019]
#info=A second tomcat instance.
#debug=0
#tomcatId=localhost:8019
#lb_factor=1
#group=lb
#group=lb_1
#disabled=0
#[channel.un:/opt/33/work/jk2.socket]
#info=A second channel connecting to localhost:8019 via unix socket
#tomcatId=localhost:8019
#lb_factor=1
#debug=0
[channel.jni:jni]
info=The jni channel, used if tomcat is started inprocess
[status:]
info=Status worker, displays runtime informations
[vm:]
info=Parameters used to load a JVM in the server process
#JVM=C:\jdk\jre\bin\hotspot\jvm.dll
OPT=-Djava.class.path=c:/Tomcat/bin/tomcat-jni.jar;c:/Tomcat/server/lib/commons-logging.jar
OPT=-Dtomcat.home=${TOMCAT_HOME}
OPT=-Dcatalina.home=${TOMCAT_HOME}
OPT=-Xmx128M
#OPT=-Djava.compiler=NONE
disabled=0
[worker.jni:onStartup]
info=Command to be executed by the VM on startup. This one will start tomcat.
class=org/apache/jk/apr/TomcatStarter
ARG=start
disabled=0
stdout=C:/Apache2/logs/stdout.log
stderr=C:/Apache2/logs/stderr.log
[worker.jni:onShutdown]
info=Command to be executed by the VM on shutdown. This one will stop tomcat.
class=org/apache/jk/apr/TomcatStarter
ARG=stop
disabled=0
[uri:/jkstatus/*]
info=Display status information and checks the config file for changes.
group=status:
#[uri:127.0.0.1:8003]
#info=Example virtual host. Make sure myVirtualHost is in /etc/hosts to test it
#alias=myVirtualHost:8003
#[uri:127.0.0.1:8003/ex]
#info=Example webapp in the virtual host. It'll go to lb_1 ( i.e. localhost:8019 )
#context=/ex
#group=lb_1
[uri:/examples]
info=Example webapp in the default context.
context=/examples
debug=0
#[uri:/examples1/*]
#info=A second webapp, this time going to the second tomcat only.
#group=lb_1
#debug=0
[uri:/examples/servlets/*]
info=Prefix mapping
[uri:/examples/*.jsp]
info=Extension mapping
[uri:/examples/*]
info=Map the whole webapp
[uri:/examples/servlets/HelloW]
info=Exampel with debug enabled.
debug=10
Thank you for your time !
Max

Btw: I get the warning starting IIS - It seems to me that IIS tries to load Tomcat on-the-fly. The Tomcat load the fails and IIS continues to load successfully.
The beginning of the IIS Event log outputs this:
Apache Jakarta Connector2, Information, Info: [jk_vm_default.c (340)]: vm.detach() ok
Apache Jakarta Connector2, Warning, Error: [jk_worker_jni.c (308)]: Can't find class org/apache/jk/apr/AprImpl
Apache Jakarta Connector2, Information, Info: [jk_worker_jni.c (297)]: Loaded org/apache/jk/apr/TomcatStarter
Apache Jakarta Connector2, None, Debug: [jk_vm_default.c (302)]: vm.attach() allready attached
Apache Jakarta Connector2, Information, Info: [jk_worker_jni.c (252)]: jni.validate() class= org/apache/jk/apr/TomcatStarter
Apache Jakarta Connector2, Information, Info: [jk_vm_default.c (607)]: vm.open2() done
Apache Jakarta Connector2, Information, Info: [jk_vm_default.c (500)]: vm.init(): Jni lib: C:\wwwapps\j2sdk1.4.2_01\jre\bin\client\jvm.dll
/watson

Javah problem - super class could not be found !!

Hi all,
i have already posted this message but i didn't get enough help to solve my poor situation.
and this is my problem:
i got in my project (myProject) MyClass class.
i wrote in another java class ,in OtherClass.class ,jni function that use MyClass object as parameter to the jni interface, as follow:
private native int myFunction (MyClass obj); //function in OtherClass
when i write the javah command line :
javah -jni OtherClass (in order to create OtherClass.h)
i always get the following error:
A required super class myPackage.MyClass could not be found.
my qoustion is how can i let the javah command line to know about the existence of myPackage.MyClass and how can i create and .h file when i using other class instance as jni function parameter in other class??
Thanks Sendy.

Lets define a few terms here.
Java can be a java virtual machine which is what runs when you type 'java' on the command line. It is also represented by the compiler which runs when you type 'javac'. And in your case it also is represented by 'javah'.
The class path defines where java finds classes that it needs.
In older versions of java you had to tell it where to find everything. It couldn't even find java.lang.String unless you told it were it was. Now days you have to tell it where to find stuff that you add (or where 3rd party libraries are.)
There are two ways to define the class path: a command line option and an environment variable.
A class path can, currently, have three types of things in it:
-A path to a zip file
-A path to a jar file
-A path
For example
-Path to zip file in windows: C:\mystuff\mylib\mystuff.zip
-Path to zip file in unix: /opt/system/projects/mystuff/mystuff.zip
-Path to jar file in windows: C:\mystuff\mylib\myjar.jar
-Path to jar file in unix: /opt/system/projects/mystuff/myjar.jar
-Path in windows: C:\mystuff\mylib
-Path in unix: /opt/system/projects/mystuff
Zip files aren't used as much anymore, but you should at least be aware of them.
Java uses the class path to look for classes which are stored in files. It does this by translating the class name into a file name. It uses packages as directory names and class names as file names. So in your case it would try to find a class called myPackage.MyClass in a file called myPackage\MyClass.class. It would try to find that in any zip files, jar files, in in any paths that you specified in the class path.
So java is trying to find myPackage\MyClass.class in your class path. It would try to find that in any zip files, jar files, in in any paths that you specified in the class path.
Right now your class path is probably just "." which means that if you do the following commands
cd C:\mystuff
javah -jni OtherClass
Then java is going to try to find myPackage.MyClass in the following file
.\myPackage\MyClass.class
That, because you 'cd' to C:\mystuff, translates to the following absolute path
C:\mystuff\myPackage\MyClass.class
So if java doesn't find that file then it is going to tell you that it can't find the file.
So where is your file? Let's say it is here.
C:\work\lib\myPackage\MyClass.class
So you must tell javah where the root is. Keep in mind that 'myPackage' must be part of the path. That is not optional. The root is the directory above 'myPackage'. So the root is
C:\work\lib
So now you have a path that is ready for your class path. So your javah command could look like this
javah -classpath ".;C:\work\lib" -jni OtherClass
Or using an environment variable
set CLASSPATH=.;C:\work\lib
javah -jni OtherClass
Keep in mind in the above that class path is a generic term and there can be other ways to define it. For example the Sun command "java" allows you to use "-classpath" or "-cp".
So does the above help?

Cannot find class: Exception??

Hi
The compiler claims it cannot find class FileNotFoundException or any other exception in my Main. Any packages I import has no problem. My structure:
java \ myMain \ Main.java
java \ com \ myName \ packages //no, the space is just there as visual help:)
Use javac -classpath java\ @compile.file
...where compile.file is a txt file giving the paths and filenames to all files I include.
This is first time I use the -classpath parameter, but I believed java.lang always was included. What Am I doing wrong.
regards
JT

You should review the tool documentation for the javac command and its use of classpath.
Your problem appears to be due to the way you defined classpath, "-classpath java\". While you don't provide enough information to conclusively say what it should be, I'm guessing it should also include java\myMain\ - assuming that you're issuing the javac command from the parent of the \java\ directory, as your command example indicates.
Here is a clip about its use of the classpath.
"When compiling a source file, the compiler often needs information about a type whose definition did not appear in the source files given on the command line. The compiler needs type information for every class or interface used, extended, or implemented in the source file. This includes classes and interfaces not explicitly mentioned in the source file but which provide information through inheritance.
For example, when you subclass java.applet.Applet, you are also using Applet's ancestor classes: java.awt.Panel, java.awt.Container, java.awt.Component, and java.lang.Object.
When the compiler needs type information, it looks for a source file or class file which defines the type. The compiler searches for class files first in the bootstrap and extension classes, then in the user class path (which by default is the current directory). The user class path is defined by setting the CLASSPATH environment variable or by using the -classpath command line option. (For details, see Setting the Class Path).
If you set the -sourcepath option, the compiler searches the indicated path for source files; otherwise the compiler searches the user class path for both class files and source files."

How to Find Classes Urgent!

I have loaded .class files using classLoader ..
i want to find calsses & interfaces which are present in perticular package structure(in memory)..if i use Package.getPackages() mathod
its returning me all the packages which are loaded in memory.using that package structure how to find the
classes and interface's
Advance Thanx

the problem is that its to hard to track the each classes and its packages.. i have more then 20 jars..each jar having morethen 25 classes with diff packge structure.. (more then one jar having same package structued classes )
so that i have loade all the classes using Systems class loader..
now my need is to find classes whichare present in perticular package structure..
for Ex. in system class loader it will automatically load java.jang.allclasses;
what i want is if i knew that package name (java.jang)
i should find the class name's like Object,String,Long...etc

How to find classes in the package if package path

in java i want to find classes,Interface,Exception names which are presant
in the package..
for example
java.sql; if i give this it should return
class name
Date
Time
DrivarManager
pls helpme in this field

download the jdk documentation or view it here
http://java.sun.com/j2se/1.3/docs/api/index.html
The exact problem is i hava set the path to my application that path contains several jar's(contains classes,Interfaces) and classes with package structure,
now my need is if i run the application ,the application
should find out the classes and Interfaces for given package structure which are present in classpath...
for this i have to load all the classes to memory(using classes loader) . then find out the classes which are present in memory...
or
any other inbuilt method is there in java when i give path structure it find and give classes which are in class path..
for ex..
if i set path to jdk
then if i give the path like java.lang
it should give me the out put as
String (or) String.class
Double
Cloneable
(classes & interface in that package)

Preverification error: Cannot find class com/sun/perseus/model/Viewport

Hi all,
I have a (previously) working Midlet to which I have added one line as follows:
SVGImage image = (SVGImage)SVGImage.createEmptyImage(null);
- and imported the necessary from javax.microedition.m2g. (I am using the library that comes with the WTK, jsr226.jar).
This builds, jars, obfuscates fine. But when I try to preverify (using Antenna's wtkpreverify) on the jar, it gives up in disgust very swiftly as follows:
[wtkpreverify] Error preverifying class javax.microedition.m2g.ScalableGraphics
[wtkpreverify] VERIFIER ERROR javax/microedition/m2g/ScalableGraphics.render(IILjavax/microedition/m2g/ScalableImage;)V:
[wtkpreverify] Cannot find class com/sun/perseus/model/Viewport
I'm using the WTK2.5.1ea and antenna 0.9.14, CLDC1.1, MIDP2.0...
Many thanks for any ideas.

Problem resolved simply by replacing jsr226.jar (as distributed with WTK2.5.1ea) with m2g.jar (as distributed with J2MEPolish).

Cannot find class java/lang/Thread

I'm getting this error trying to compile a program that I'm writing in java. Its a very simple program just to get me back to basics. Any ideas as to how I can fix this problem??

Extracted from Sun's website,
* Error Message: "Exception in thread NULL" or
"Unable to initialize threads: cannot find class java/lang/Thread"
If you are getting one of these fatal error messages when running java,
javac, or appetviewer, you should check your CLASSPATH environment variable.
It may list "c:\java" or the "classes" directory from an older release. You can either unset the CLASSPATH variable, or set it to
include only the latest version of the Java platform class library. For example:
C:\> set CLASSPATH=.;C:\jdk1.1.8\lib\classes.zip
This will make sure that you are using the correct classes for this release.
-- Sudha

Error: Unable to find class for bean

Dear all,
please help help with the problem
i've a jsp as follows:
<@page import="java.util.*, com.abc.*" %>
<jsp:useBean id="mybean" class="MyClass" />
<% out.println("Testing bean"); %>
where MyClass.class is located WEB-INF/classes/com/abc/MyClass.class
it works fine in Oracle iAS with oc4j 1.0.2.1.1 (not 9iAS R2)
when i upgrade to 9iAS R2 with oc4j 9.0.3
it's complaining the error of
OracleJSP: oracle.jsp.parse.JspParseException: Line # 8, <jsp:useBean id="mybean" class="MyClass" />
Error: Unable to find class for bean: mybean defined by tag with class: MyClass
then i changed the line <jsp:useBean....> to
<jsp:useBean id="mybean" class="com.abc.MyClass" />
it didn't complain the error
anyone know that the syntax of specifying class must be coded as package.xxx.xxx etc?
Thank you very much

You should specify the fully qualified class name (i.e. with package structure) in the class attribute of useBean tag.
Read the syntax of useBean tag here
http://java.sun.com/products/jsp/syntax/1.1/syntaxref1115.html
Chandar

Problem finding class?

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