How to load a class in lib/file.jar

Hi,
I use jboss 4.0.2. and i have a jar-file from a third party in my server/default/lib that calls Thread.currentThread().getContextClassLoader().loadClass("foo"); My problem is that foo.class is never found and i dont know where i have to place this class. I would like to have a seperate folder for my classes, but i dont know how i should configure the classloader to find my classes. i dont want to package them in a jar.
Thanks a lot!

i tried this but the class was not found
my simple question is:
if a class in a jar that is placed in my jboss/server/default/lib-directory tries to load a class dynamic, where is it(classloader) looking? please tell me...
thanks

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981145 wrote:
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Step by Step details on how to load data from a flat file

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hi sonam.
it is very easy to load data from flat file. whn compared with other extrations methods...
here r the step to load transation data from a flat file.......
step:1 create a Flat File.
step:2 log on to sap bw (t.code : rsa1 or rsa13).
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3.1: create infoarea
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>continue..
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---> NOW SELECT TRANSFER RULES TAB. AND SELECT PROPOSE TRANSFER RULES SPINDLE LIKE ICON.
(IF DATA TARGET IS ODS -
INCLUDE 0RECORDMODE IN COMMUNICATION STRUCTURE.)
--->ACTIVATE...
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>ACTIVATE..
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> O INFOSOURCE : _________(U R INFOSOURCE). AND PRESS ENTER KEY.......
>ACTIVATE.....UR UPDATE RULES....
>>>>SEE THE DATA FLOW <<<<<<<<----
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I HOPE THIS LL HELP YOU.....

How to Load a class file base on .class file name???

Hi,
Can anyone help me?
1) Based on filename (d:\temp\bla.class), I want to load this bla.class and get the actual package of this class.
example:
package something.temp;
public class bla
I want to load the file base on filename and get the package of the class. Is it possible ?
Thank you.

Hi nikki96,
It will not work. I will get java.lang.NoClassDefFoundError eventhough I extends classloader to use the findClass(String filename);
Example:
import java.security.*;
import java.util.Enumeration;
import java.util.NoSuchElementException;
import java.util.jar.Attributes;
import java.util.jar.Manifest;
import sun.misc.Resource;
import sun.misc.URLClassPath;
public class MyURLClassLoader extends ClassLoader
String host;
int port;
public Class findClass(String name)
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               if (length > Integer.MAX_VALUE) {
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Objective: I just want to base on the bla.class (no matter where is it located), then get the package of the classfile (bla.class) like example something.temp.
Simple as that but I don't know how to do :(.

How to load a .class file dynamically?

Hello World ;)
Does anyone know, how I can create an object of a class, that was compiled during the runtime?
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- I compile these file, so XYScanner.class and XYParser.class are available.
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Isn't there any way to instantiate the class in a way like
Class c = Class.forName("/home/mark/XYScanner");
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The normal call would be:
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Class cls = Class.forName("method2");
Class partypes[] = new Class[2];
partypes[0] = Integer.TYPE;
partypes[1] = Integer.TYPE;
Method meth = cls.getMethod("add", partypes);
method2 methobj = new method2();
Object arglist[] = new Object[2];
arglist[0] = new Integer(37);
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System.out.println(retval.intValue());Has anyone an idea? Thanks for each comment in advance!!!

Dump all of your class files into a directory.
Use the File class to list all files and iterateover
the files.NastyNot really, when you are dynamically creating code, I would expect the output to be centralized, not spread out all over the place.
>
Use a URLClassloader to load the URL that isobtained
for each file with file.toURI().toURL()(file.toURL()
is depricated in 1.6)Wrong, the URL you give it must be that of the
directory, not the class file.No, I did this quite recently, you can give it a specific class file to load.
>
Load all of the classes in this directory, thatway
any anonymous classes are loaded as well.Anonymous classes automatically loaded when the real
one isIt can't load it if it doesn't know where the code is. Since you haven't used a URL classloader to load once class file at a time, you would never encounter this. But if you loaded a class file that had an anonymous classfile it needed, would it know where to look for it?
>
From this point you should be able to just get a
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it's called in, which will be the system classloader.
It won't find classes loaded by a URLClassLoader.got me there.

How to load parent Class like this?

I have a java application that use another class in a jar file. And there is a class in the application's main class extends the class in the jar file. I have packaged the application into a jar file.
the directory structure :
foder [dist] : app.jar [lib]
foder [lib]: Library.jar
(I excute "java" cmd in folder "dist" )
Now i can run it, if i use command line option -Xbootclasspath/a:
"java -Xbootclasspath/a:lib/lib.jar -jar app.jar"
(Because if i use "java -jar ", "-cp .;lib/Library.jar" option have no effect.)
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Main.javapackage myapp;
java.net.URL liburl = new java.io.File("lib\\Library.jar").toURL();
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Class c = loader.loadClass("mylib.parentclass");
Object    parentobj = c.newInstance();
//c = loader.loadClass("myapp.subclass"); //can't run
//Object    subobj = c.newInstance();
subclass.javapackage myapp;
subclass extends parentclass{
}parentclass.javapackage mylib;
public class parentclass{
}the code Object    parentobj = c.newInstance(); can excute without problem . parentclass's constructor excuted.
but
c = loader.loadClass("myapp.subclass");
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I used the "-verbose:class" option , the output is:
[Loaded java.lang.ClassFormatError from shared objects file] <---the last line
Thanks for reading and participating .
Please help me or point me to resources where I can read .
Sorry for my poor english.
thanks a lot .

The problem is that when a class wants to resolve a reference to another class (e.g. when a class fetches it's parent) it uses the classloader that loaded it, which is not necessarilly the classloader from which it was requested.
When you ask a standard classloader (e.g. URLClassLoader) for a class the first thing it tries is asking it's parent class loader. Only if the parent doesn't find the class does it try itself.
So, if a class is available to the system ClassLoader then even though you ask a URLClassLoader for it, it's the system ClassLoader which actually loads it and, hence, it's the system ClassLoader that class uses to resolve any references.
ClassLoaders generally form a kind or heirarchy and references can be made towards the root of the ClassLoader tree, but not in the other direction.
You would have to do something like have a small main class which sets up the classloader and make your real main class available only on the jars that the URLClassLoader adds to the classpath. That way the main class will have the URLClassLoader as its ClassLoader and will use it to get it's parent class.

How to load a Class Dynamically?

hi,
I have the following problem.I am trying to load a class dynamically.For this I am using ClassLoader and its Loadclass method.My code is like this,
File file = filechooser.getSelectedFile();
ClassLoader Cload = this.getClass().getClassLoader();
String tempClsname= file.getName();
Class cd =Cload.loadClass(tempClsname);
Object ob =(Object)cd.newInstance();
showMethods(ob);
In showMethods what i am doing is getting the public methods of the dynamically loaded class,
void showMethods(Object o){
Class c = o.getClass();
System.out.println(c.getName());
vecList = new Vector();
Method theMethods[] = c.getDeclaredMethods();
for (int i = 0; i < theMethods.length; i++) {
if(theMethods.getModifiers()==java.lang.reflect.Modifier.PUBLIC)
String methodString = theMethods.getName();
System.out.println(methodString);
vecList.addElement(methodString);
allmthdlst.setListData(vecList);
Now whenever i work with this i m getting a runtime error of CLASS NOT FOUND Exception..I know its because of Classpath..But i don't know how to resolve it??pls help me in this regard...
Also previously this code was working with java files in the directory in which this java file was present..How to make it work for java file in some other directory..pls help me in this regard...
Thanks in advance..

You sure didn't need to post this twice.
http://forum.java.sun.com/thread.jsp?thread=522234&forum=31&message=2498659
When you post code, please use [code] and [/code] tags as described in Formatting Help on the message entry page. It makes it much easier to read and prevents accidental markup from array indices like [i].
You resolve this problem by ensuring the class is in the classpath and you refer to it by its full name.
§

Failed to load main-class manifest attribute from jar files....

Hi,
I installed Java1.5 version in my system before to that Java1.6 was installed and uninstalled. When i i double clicked on any jar file getting a message like: Failed to load main-class manifest attribute from<name of the jar file>.jar file....
can anyone please suggest me how to rectify this error.

mvnath wrote:
The jar files are worked before the installation of 1.5 but not after installation of 1.5I am guessing that the Windows file association for .jar somehow got munjed. It's hard to say since you have not provided much information.

How to load a class in lib/file.jar

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