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    <p>Basically, I think you are barking up the wrong tree:</p> <ul> <li><p>The JVM / GC <em>will</em> manage to deallocate unreachable objects, no matter how fast you allocate them. If you are running the classic non-concurrent GC, then JVM will simply stop doing other things until the GC has deallocated memory. If you configured your JVM to use a concurrent GC, it will try to run the GC and normal worker threads at the same time ... and revert to "stop everything and collect" behaviour if it cannot keep up.</p></li> <li><p>If you are running out of memory, it is because something in your application (or the libraries / drivers it is using) is leaking memory. In other words, something is causing objects to remain reachable, even though your application doesn't need them any more.</p></li> </ul> <p>As comments have pointed out, you need to address this problem methodically using a memory profiler / heap dump. Randomly changing things or blaming it on the GC is highly unlikely to fix the problem.</p> <p>(When you say <em>"... I did use stmt.close() all the time"</em>, I assume that this means that your code looks something like this:</p> <pre><code> PreparedStatement stmt = ... try { stmt.execute(); // ... } finally { stmt.close(); } </code></pre> <p>If you don't put the <code>close</code> call in a <code>finally</code> then it is possible that you are NOT calling <code>close</code> every time. In particular, if some exception gets thrown during the <code>execute</code> call or between it and the <code>close</code> call, then it is possible that <code>close</code> will not get called ... and that will result in a leak.)</p>
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    1. COI meant that it gets closed in each iteration of the while loop; this way I give away memory allocated to a stmt after every iteration and dont wait for billion allocations to happen before I close in finally. However bec of having prep stmt in the loop I am compiling the stmt each iteration as well which I think is inefficient and I will change that. However I dont see any other exception being thrown. I see your point though and have added a finally block as well.
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    2. CO@p1 - IMO, it is "best practice" to release resource handles in a `finally` block, even if you cannot imagine any way that an exception might be thrown. (And, of course, there is a good chance that your memory leak or leaks are somewhere else ...)
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