ConcurrentModificationException

For example, it is not generally permssible for one thread to modify a Collection while another thread is iterating over it.

for(Personel personel : personelList){
if(!personel.getSelected()){
personelList.remove(personel);
}else{
personel.setParent(parent);
}
}

sun

Abstract Class-Concrete Class example :)

Abstract classes are "abstraction" of a class as the name suggests. As an example: The Human class can be an abstract class and in its concrete classes "man" and "woman", some of the functionalities are common. For example "human" can have a function "walks". Now "walks" is something that belongs to all humans. But "dances" is a function that might be different for "man" and "woman" or maybe to anyone who belongs to this class. So we over ride the "dances" functionality to provide seperate implementation to different implementors.

Linux copy directory

You can use;

cp -Rf source_dir/ dest_dir/

to copy one directory to another. And -R parameter means Recuresively; f means forcefully.

eclipse.ini

Here is my eclipse.ini file :

-vm C:\Program Files\Java\jdk1.6.0_12\jre\bin
-vmargs
-Dsun.lang.ClassLoader.allowArraySyntax=true
-Xms40m
-Xmx512m

My development environment is Eclipse 3.4.1, Weblogic 10.3 ...

We were using OC4J but now we changed the Application Server to WebLogic and the JDK version 1.5 to 1.6. Some of my friends said that, If I use bea_rockit version of the JDK the memory leak occures. So I changed the virtual machine configuration to standart Sun JDK.

-Xms40m
-Xmx512m
-->
Sets the heap space 40MB initially and a maximum of 512MB. These values can differ depending on your development environment.