Java heap problem, cant set heapsize

Question

Hi,
I am currently facing problem of java heap. With large number of Objects in ArrayList ( approx 70000), i am getting exception from java heap.
Current task: i am collecting records from database, mysql 5.5, where i have one table about 4 million entries. I am so far successful with fetching records while setting MaxRow() ( although i am failed to use setFetchSize()). Whenever function tries to finish its processing and going to put records in ArrayList. JAva throws an Memory ( Java heap Exception). I like to know your ideas to have a concerete solution. Necessary information related to my development enviourment and solutions is as follows.
<p>
IDE: Eclipse europa
Server: Tomcat 6
Database: mysql 5.5
Operating System: Windows XP
</p>
<p>
Tried Solutions: I have tried to set Java heap size at Tomcat upto 3gb but it do not work.
Source Code :
<br />
</p>
// calcuate count(*) for desired query.<br />
QueryResultSize = getEvalautionQueryResults(true, 0, user, movie,<br />
board, hoster, from, until);<br />
<br />
if (QueryResultSize > 0) {<br />
<br />
// recall query till all results( query result size) are not<br />
// loaded in links list<br />
try {<br />
while (counter < QueryResultSize) {<br />
<br />
EvaluationObject eval;<br />
String q = "";<br />
String query = this.getEvaluationQueryString(false, user,<br />
movie, board, hoster, from, until);<br />
if (counter < fetchsize) {<br />
<br />
q = query + " and fetchid > 0 order by fetchid;";<br />
<br />
} else {<br />
<br />
q = query + " and fetchid > "<br />
+ Long.toString(lastFetchId)<br />
+ " order by fetchid;";<br />
}<br />
// just for test preparedstatement execution is called here<br />
pstmt = conn.prepareStatement(q);<br />
pstmt.setMaxRows(fetchsize);<br />
ResultSet rs = pstmt.executeQuery();<br />
<br />
while (rs.next()) {<br />
<br />
ResultSet nextRs;<br />
String boardd = "";<br />
URI uri = null;<br />
try {<br />
lastFetchId = Long.parseLong(rs<br />
.getString("fetchid"));<br />
boardd = rs.getString("board");<br />
uri = URI.create(boardd);<br />
} else {<br />
<br />
shortBoard = "";<br />
}<br />
<br />
}<br />
query = "SELECT * FROM board WHERE board='http://"<br />
+ shortBoard + "' OR board='http://www."<br />
+ shortBoard + "';";<br />
if (statement.isClosed()) {<br />
statement = conn.createStatement();<br />
}<br />
nextRs = statement.executeQuery(query);<br />
if (nextRs.next()) {<br />
eval = new EvaluationObject()
links.add(eval);<br />
} else {<br />
eval = new EvaluationObject()
links.add(eval);<br />
}<br />
if (counter > fetchsize)<br />
if (isCounterChanged) {<br />
model.notifyLogListener(null, counter<br />
+ " Links has been copied", "",<br />
LogEvent.ERROREVENT);<br />
System.out.println(counter<br />
+ " Links has been copied");<br />
isCounterChanged = false;<br />
}<br />
}<br />
// because each time resultset loads 5000 results<br />
counter += fetchsize;<br />
isCounterChanged = true;<br />
<br />
}<br />
<br />
} catch (SQLException e) {<br />
e.printStackTrace();<br />
model.notifyLogListener(null, e.getMessage(), "",<br />
LogEvent.ERROREVENT);<br />
}<br />
<br />
<p>
<br />Regards,
Romi
PS: Thanks in advance
I am not quite sure whether it is right place to post the question. If it is not and you know the answer ....... please dont hesitate to reply.
</p>

Answer 1

With large number of Objects in ArrayList ( approx 70000),By itself that isn't that big. If each object was 1000 bytes then that would only be 70 meg.
Tried Solutions: I have tried to set Java heap size at Tomcat upto 3gb but it do not work. If you set it correctly and it did not change anything in how your application worked then it is a bug in your code.
You posted your code but however you did it is wrong and you need to use the forum correctly using code tags to post the code so it is readable.