OutOfMemoryError with Vectors

Question

Hello,
I am trying to read a lot of data using a database built-in function : search.
The resultset is put into a vector using the following code :
public Vector search (......)
Vector v=new Vector();
LDAPSearchResults res=ld.search(.......);
while ( res.hasMoreElements())
v.addElement((LDAPEntry) results.next());
return v;
When calling the method for 30000 registers : Vector v=search(.......)
I get a OutOfMemorError.
I have tried to capture the OutOfMemoryError in the search Method
public Vector search (...)
try
} catch (OutOfMemoryError e)
System.out.println("No memory!!!");
but it does not work. I still get : java.lang:OutOfMemoryError.
I am calling those functions from the WEB.
THanks for helping.

Answer 1

Hi,
from my experience catching out OutOfMemoryErrors works in JSP as expected.
Following Code runs fine on TomCat 3.21: After the Vector eats up all memory there appears the OutOfMemoryError which is caught by the exception handler.
Could be a problem with you Servlet/JSP container - what are you running? - or the LDAP-Server (?) you are using.
Whether or not you application can do any sensefull in an out-of-memory-situation is the other side of the coin. ;-)
Regards
Martin Schl�ter
<code>
<%@page contentType="text/plain"%>
Plain text JSP
<%
String str = " Hallo Welt Hallo Welt Hallo Welt Hallo Welt Hallo Welt Hallo Welt Hallo Welt Hallo Welt Hallo Welt Hallo Welt Hallo Welt Hallo Welt Hallo Welt Hallo Welt Hallo Welt Hallo Welt Hallo Welt Hallo Welt";
str += str + str;
str += str + str;
str += str + str;
str += str + str;
Vector vec = new Vector();
for(int i = 0; i < Integer.MAX_VALUE; i++)
try
vec.addElement(str);
catch(OutOfMemoryError ex)
out.println("Ex: " + ex.getClass().getName());
break;
if(i % 100000 == 0)
out.println(i);
out.flush();
%>
</code>