Adding to Array from JavaSpace problem

Not sure if this is advanced or not but here goes:

I'm now stuck on such a simple task I have no idea what to do. I just want to take from the space all "chatRooms" then extract the chat room name which i will keep in an array, then write to the space supplying the extracted chat room name and "chatRooms". I have tried writing the object to array but no luck as it showed an object but couldn't extract name. I keep getting the following error from the code:

Error: Exception in thread "main" java.lang.IndexOutOfBoundsException: Index: 1, Size: 1

Code :

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public void threadchatRetrieval()
{
 
space = SpaceUtils.getSpace();
if (space == null){
System.err.println("Failed to find the javaspace");
System.exit(1);}
int count = 0;
Username template = new Username(null,"chatRooms");
do{
 
try {
temp = (Username)space.take(template, null,6000);
System.out.println("output: " + temp.Name);
 
if(temp.Name.equals(null)){
System.out.print("null entry");
} else{
entry.add(0, temp.Name);
count++;
System.out.print("added at: " + count);
 
}
 
} catch (RemoteException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (UnusableEntryException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (TransactionException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (NullPointerException e){
System.out.println("done");
 
}
 
 
//entry.add(temp.Name);
 
}while(temp != null);
System.out.println("output size: " + entry.size());
 
for (int i=0; i<= entry.size();i++) {
 
System.out.println( "for: " + entry.get(i));
 
try {
String Username = entry.get(i);
Username template_new = new Username(Username,"chatRooms");
System.out.println( "write: " + Username);
space.write(template_new, null,8000);
 
} catch (RemoteException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (TransactionException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}

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Well, first of all. The IndexOutOfBoundsException is being thrown because your array contains only 1 value and the index is going further than 0 i.e. the index is out of range, hence the 'out of bounds' part of the exception. I'm not 100% certain I follow what your trying to do but here goes my interpretation:
Extract all chatroom names from space;
Extract each chatroom name, store individual names in a string array;
Access string array[n] and use this value and all chatroom names to write to space;
Please let me know if this is correct.

Quote:

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I just want to take from the space all "chatRooms" then extract the chat room name which i will keep in an array, then write to the space supplying the extracted chat room name and "chatRooms"

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Can you rewrite your requirements in java programming terms?
Your question is all jargon about your app. Translate that to variables, classes and methods.