Accessing a Class in a Package[in a dir] via Different Directory

Hi,
I am trying to access a class belonging to a package in a directory via another class in a different directory.
However, there are problems.
Here is what I do:
I created a source file ProtectedTest2.java
package com.java.MyLesson.ch8;
public class ProtectedTest2
private int iN1, iN2;
public ProtectedTest2(){ }
public ProtectedTest2(int iA, int iB)
iN1 = iA;
iN2 = iB;
public String getNumbers()
return "Numbers are: "+iN1 +" and "+ iN2;
} After that, I compiled this file with javac -d C:\\MyUserClasses ProtectedTest2.java. There was no problem.
I then, created another source file TestPro2.java and imported ProtectedTest2 in TestPro
import javax.swing.JOptionPane;
import com.java.MyLesson.ch8.ProtectedTest2;
public class TestPro2 extends ProtectedTest2
public TestPro2()
ProtectedTest2 pro = new ProtectedTest2(8,12);
JOptionPane.showMessageDialog(null, p.getNumbers() );
public static void main(String args[])
new TestPro2();
System.exit(0);
} Then, I continue to compile TestPro2.java like this:
javac -classpath C:\\MyUserClasses TestPro2.java -- there was no problem, but when I try to execute
TestPro2, the error I got was :
Exception in thread "main" java.lang.NoClassDefFoundError: com/java/MyLesson/ch8/ProtectedTest2
at java.lang.ClassLoader.defineClass0(Native Method)
at java.lang.ClassLoader.defineClass(ClassLoader . java:502)
I understand that the class loader will look into the classpath[current directory] if it cannot find the user- defined class [ProtectedTest2.class] in the standard and optional java packages. Why did the application raise error if I have specified the classpath for the ProtectedTest2.class [which is in C:\MyUserClasses] during the compilation of TestPro2.java ?
Can someone please correct me and tell me what is the mistake here ?
Thank you all! :-)

You need to have C:\MyUserClasses in the class search path both when compiling and running.
Where the compiler finds a depency class is not saved in the generated .class file, so the runtime is on its own when it needs to find it. If C:\MyUserClasses is not in the class search path, the runtime doesn't know that it should be looking for ProtectedTest2 there. In addition to MyUserClasses you want to search for classes in the current directory (the path ".") so the command to execute TestPro2 is:
java -classpath .;C:\MyUserClasses TestPro2
See also the document on how classes are found (if you already haven't)
http://java.sun.com/j2se/1.4.2/docs/tooldocs/findingclasses.html

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Message was edited by:
confused_in_java

There's nothing wrong with it per se... but it has a
number of pitfalls. Basically it's a hell of a lot
more likely to go wring at runtime than the good ole
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matches in the cupboard above the fridge... and get
yourself another beer whilste you're there.
Christians don't drink on Sunday. So there's more for
me.Thanks I wil remember this.
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I was just wonder that if we can put our package, which include classes offcourse at some web location, then this will be available to us from anywhere and can be shared all accross.
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Message was edited by:
confused_in_java

Problem with Dynamically accessing EJB Class objects in WL 7.0 SP1

I am trying to build a component which has the ability to instantiate and execute
an known EJB method on the fly.
I have managed to build the component but when I try and execute it I get a ClassNotFoundException.
I know that the EJB I am trying to invoke is deployed and available on the server,
as I can see it in the console, I also seen to have been able to get the remote
interface of the object, my problem occurs when I try and access the class object
so I can perform a create on the object and then execute my method
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private Object getRemoteObject(Context pCtx, String pJNDIName, String pHomeBean)
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Object home = pCtx.lookup(pJNDIName);
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Method homeCreateMethod = homeBean.getMethod(homeCreate,homeCreateParam);
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} catch (NamingException ne) {
logStandardErrorMessage("The client was unable to lookup the EJBHome.
Please make sure ");
logStandardErrorMessage("that you have deployed the ejb with the JNDI
name "+pJNDIName+" on the WebLogic server ");
throw ne;
} catch (Exception e) {
logStandardErrorMessage(e.toString());
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Jo Corless

Hello Joanne,
Congratulations! I'm very happy that you've managed to fix your problem. It's
always essential to understand how to package applications when deploying on BEA
WebLogic. Usually, by throwing everything into an EAR file solves just about all
the class loader problems. :-) Let us know if you have any further problems that
we can assist you with.
Best regards,
Ryan LeCompte
[email protected]
http://www.louisiana.edu/~rml7669
"Joanne Corless" <[email protected]> wrote:
>
>
I've fixed it!!!!!!!!
Thanks to everyone who gave me help!!!!
The class loader was the culprit which is what I suspected all along.
As soon
as I put the 2 jar files I was using into an EAR file the problem went
away!!!!!
Thanks again
Jo Corless
"Ryan LeCompte" <[email protected]> wrote:
Hello Joanne,
As Mr. Woollen mentioned, I also believe it's a problem with the class
loader.
You need to be careful how you arrange your EJBs, because WebLogic has
a specific
method in which it loads classes in an EAR, JAR, and WAR file(s). Please
refer
to http://dev2dev.bea.com/articles/musser.jsp for more information about
BEA WebLogic
class loading mechanisms and caveats. Also, try printing out the various
methods
that are available on the object that was returned to you via reflection.
For
example, use the getMethods() method, which returns an array of Method
objects
that you can subsequently cycle through and print out the various method
names.
This way you can discover if the class found/returned to you is indeed
the one
you intend to locate.
Hope this helps,
Ryan LeCompte
[email protected]
http://www.louisiana.edu/~rml7669
Rob Woollen <[email protected]> wrote:
I believe the issue is the home interface class for this EJB is not
available in the class loader which is doing the reflection.
If you do:
getClass().getClassLoader().loadClass(homeInterfaceClassName)
I suspect it will fail. Reflection still requires that the class be
loadable.
-- Rob
Joanne Corless wrote:
Hi Slava,
If I make my code look like you describe below I get a compliationerror telling
me that
home.getMethod() is not recognised (no such method)
If I change it slightly and use
Method homeCreateMethod =
home.getClass().getMethod(homeCreate,homeCreateParam);
The code will compile OK but when executed it still throws a NoSuchMethodException
Any ideas ?
Thanks for your help so far
Regards
Jo Corless
Your code should look like
Object home = pCtx.lookup(pJNDIName);
Method homeCreateMethod =
home.getMethod(homeCreate,homeCreateParam);
return homeCreateMethod.invoke(home, homeCreateParamValues);
Regards,
Slava Imeshev
"Joanne Corless" <[email protected]> wrote in message
news:[email protected]...
Hi Ryan,
I also wanted to mention that if you do a "header search" in this
particular
newsgroup
with the search query as "reflection", you will see many previousmessages
regarding
reflection and EJBs. I believe you could learn a lot from thedifficulties
that
others have faced and solved.I tried that and although there was a number of similar cases noneof them
actually
seem to fix my issue. Thanks for the suggestion though
Are the EJBs that you are trying to access accessible via your
system
classpath?
Try to avoid having them accessible via the main system classpath,and
only bundle
them in your appropriate EJB jar files (contained in an EAR file,for
example).Maybe I should have laid the problem out a little clearer.
I have a number of EJB's bundled up in a JAR file which is hot deployedto
the
server. Within this first JAR file is an EJB (SSB) component that
needs
to
be
able to invoke a known method on another EJB. This second EJB may
or
may
not be
within the first JAR file but it also will be hot deployed.
The component trying to invoke the method on the 2nd EJB has to
be
able to
create
an instance of the 2nd EJB without actually knowing anything bar
a
JNDI
Name which
is passed in at runtime.
I can get as far as doing the
Object home = pCtx.lookup(pJNDIName);
This returned a class with the name
"com.csc.edc.projects.allders.httppostoffice.postman.PostmanBean_mp8qy2_Home
Impl_WLStub"
My problem seems to occur when I try and invoke the create method
Method homeCreate = home.getClass().getMethod("create", new Class[0]);
My code throws a java.lang.NoSuchMethodException at this point so
I
am
unable
to progress to the next step of :
Object bean = homeCreate.invoke(home, null);
So I can return the instantiated bean back to the calling client.
Why am I getting the NoSuchMethodException, is is because I am gettinga
stub
back rather than the home interface and if so how do I get the truehome
interface
from the bean
Thanks in advance
Jo Corless

Class name and package name clashing

When i have a class and a package with the same name, I cannot access classes in the package. For example I have 3 classes and 1 package as below
- Test.java
- PackageName.java
+ PackageName // this is a directory
- MyClass.java
Below are the codes of .java files
Test.java
=======
public class Test { PackageName.MyClass a = new PackageName.MyClass ();}
PackageName.java
===============
public class PackageName{ }
MyClass.java
==========
package PackageName; public class MyClass { }
I can compile PackageName.java and MyClass.java but not Test.java. It says
cannot resolve symbol
symbol : class MyClass
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PackageName.MyClass a = new PackageName.MyClass ();
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This works fine: just add an import to Test.java.
import PackageName.MyClass;
public class Test
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public class PackageName {}
package PackageName;
public class MyClass {}It's a pretty wacky, useless example, but it works.
Plus I thought inner classes would have a dollar sign in their .class file names. When I compile this:
public class OuterClass
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        System.out.println(outer);
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}I see two .class files: OuterClass.class and OuterClass$InnerClass.class
Why make up examples like this? It's hard enough writing code, and it's easy to disambiguate for the compiler.

How to refer to root class from a package in Java 1.4

Hi
I have written a class at root level and it is being called be a different class which is defined in a package, when I am trying to import base class it is giving compilation error in Java 1.4.0 and Java 1.4.1 version but code work fine with java 1.2.2
For you reference here is sample code
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public class AddNumbers{
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Thanks
AKM

The root package should never have been automatically included for compilation purposes.
In order to access a class in the root package import it as you should for any other class.
import AddNumbers;
is the proper way to do this.
The only time you don't need to use an import statement is if the class you wish to reference is in the same package as the class that refers to it. Again, you should really import such classes as it makes things explicitly clear which classes you are referring to.

Anyone know how to find available classes in a package?

Anyone know how to find available classes in a package?
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Here is some code I tried.
I'm not very familiar with manipulating JARs The code below is what I tried, but how do I access the packages like "java.io" in the JarFile? and then get the available classes?
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