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PACKAGE

 
thomas davis
Ranch Hand
Posts: 207
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Hi All,
Given below are the steps followed:
1) I have one class that is stored in a directory structure given below:
D:\WebSphere\AppServer\installedApps\globalrfx.ear\global.war\WEB-INF\classes\com\sharedapps\globalrfx\beans\service\modify\ChangeDB.class
2) I set class path like this: D:\WebSphere\AppServer\installedApps\globalrfx.ear\global.war\WEB-INF\classes\;
3) And I put my first statement in that class as given below
package com.sharedapps.globalrfx.beans.service.modify;
It compiled fine
4) I have got another class up in the hierarchy as given below:
D:\WebSphere\AppServer\installedApps\globalrfx.ear\global.war\WEB-INF\classes\com\sharedapps\globalrfx\beans\common\Contact.class

6) This also compiled fine
7) And What I did is I append classpath as given below
D:\WebSphere\AppServer\installedApps\globalrfx.ear\global.war\WEB-INF\classes\com\sharedapps\globalrfx\beans\service\modify\;
8) And I removed package declaration from top of class ChangeDB,It again compiled fine.(removed package com.sharedapps.globalrfx.beans.service.modify;
)
9) But When I try instantiate ChangeDB in Contact class and I imported all classes from modify where class ChangeDB LOCATED. import com.sharedapps.globalrfx.beans.service.modify.*; I got error as given below
Contact.java:24: cannot access com.sharedapps.globalrfx.beans.service.modify.ChangeRemoveATMDB
bad class file: J:\WebSphere\AppServer\installedApps\globalrfx.ear\global.war\WEB-INF\classes\com\sharedapps\globalrfx\beans\service\modify\ChangeDB.class
class file contains wrong class: ChangeDB
Please remove or make sure it appears in the correct subdirectory of the classpath.
ChangeRemoveATMDB objDB = new ChangeRemoveATMDB();
Even though I imported the class, why I am getting above said error? I set the classpath till where the class is situated. Now JVM can see where the class is located and that can be accessed from that package also.
But When I added the package statement again in ChangeDB.class,
It compiled fine!!! I was able to access the same class from the class Contact in other folder D:\WebSphere\AppServer\installedApps\globalrfx.ear\global.war\WEB-INF\classes\com\sharedapps\globalrfx\beans\common\
How does JVM locate the classes and how does it load the class?
Why package declaration is necessary even if I set classpath till that point where class is resided? Can anybody explain about the relationship between classpath, package declaration et all?
 
Dhamodharan Krishnan
Greenhorn
Posts: 23
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Hi Thomas,
 
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