I am getting a memory leak with a web application I am developing and would appreciate help in tracking down the cause.
General Application Structure:
* The application follows a standard Model-View-Controller (MVC)
Pattern. All requests are handled by a Controller
servlet which queries the database (via a helper class which is instantiated in the Controllers Init() method) and then passes to
JSP view.
* The helper class opens a connection pool to a Lotus Notes database (type II driver), executes the query and passs back the results in a Arraylist and a Hashmap.
Test Environment:
Tomcat 4.0.3 on Windows 2000, JDK is 1.3.1
When stress testing the application the memory usage goes up after each test and the memory resources do not get released, until eventually it crashes the tomcat server.
Here's the helper class method that is used by the servlet to get an Arraylist of products to display. myConn is the Connection Pool
public ArrayList getStockItems(
String[] ref)
throws SQLException, ClassNotFoundException {
tempConn = myConn.getConnection();
ArrayList products = new ArrayList();
try {
products.clear();
for (int i = 0; i < ref.length; i++) {
stmt = tempConn.createStatement();
rs = stmt.executeQuery("SELECT * FROM IsStockView
WHERE prodCode ='"+ref[i]+"'");
while (rs.next()) {
prodCode = rs.getString("prodCode");
prodName = rs.getString("prodName");
// various other details retrieved...
tempStockItem = new StockItem(prodCode, prodName,...);
products.add(tempStockItem);
}
rs.close();
}//end of for loop..
}
catch (Exception e) {
e.printStackTrace();
}
finally {
if (tempConn != null) {
myConn.releaseConnection(tempConn);
}
}
return products;
}
I have run this also with JProbe memory debugger, but finding it difficult to interpret the results - there doesn't seem to be any obvious loitering objects. I am wondering if the leak could be with the
JDBC driver. How can I confirm if the driver is the problem, given it is Type II and uses the Notes C++ API?
All views and opinions will be appreciated.
--
Thanks