Databases
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    <p>I'd first attach a profile tool to tell you what these "Objects" are that are taking up all the memory.</p> <p>Eclipse has TPTP, or there is JProfiler or JProbe.</p> <p>Any of these should show the object heap creaping up and allow you to inspect it to see what is on the heap.</p> <p>Then search the code base to find who is creating these.</p> <p>Maybe you have a cache or tree/map object with elements in and you have only implemented the "equals()" method on these objects, and you need to implement "hashcode()". This would then result in the map/cache/tree getting bigger and bigger till it falls over. This is only a guess though.</p> <p>JProfiler would be my first call</p> <p>Javaworld has example screen shot of what is in memory...</p> <p><a href="http://www.javaworld.com/javaworld/jw-08-2003/images/jw-0822-profiler16.gif" rel="noreferrer">alt text http://www.javaworld.com/javaworld/jw-08-2003/images/jw-0822-profiler16.gif</a></p> <p>And a screen shot of object heap building up and being cleaned up (hence the saw edge)</p> <p><a href="http://www.javaworld.com/javaworld/jw-08-2003/images/jw-0822-profiler19.gif" rel="noreferrer">alt text http://www.javaworld.com/javaworld/jw-08-2003/images/jw-0822-profiler19.gif</a></p> <p>UPDATE *************************************************</p> <p>Ok, I'd look at...</p> <p><a href="http://www-01.ibm.com/support/docview.wss?uid=swg1PK38940" rel="noreferrer">http://www-01.ibm.com/support/docview.wss?uid=swg1PK38940</a></p> <p>Heap usage increases over time which leads to an OutOfMemory condition. Analysis of a heapdump shows that the following objects are taking up an increasing amount of space:</p> <p>40,543,128 [304] 47 class</p> <p>com/ibm/wsspi/rasdiag/DiagnosticConfigHome 40,539,056 [56] 2 java/util/Hashtable 0xa8089170 40,539,000 [2,064] 511 array of java/util/Hashtable$Entry 6,300,888 [40] 3 java/util/Hashtable$HashtableCacheHashEntry</p>
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    1. POHow to free up memory?
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    1. COI have analysed the heapdumps, coredumps and the nativestderr log and have the list of objects. The problem however is how to go about fixing the problem...
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    2. COimages attached to the original qn...
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    3. COwow nice heap size! :-) Ok, I'd search the JSP for any map's/hashmap/treemaps etc. I'm going to guess that somewhere someone is putting objects into a hashmap with a String key, and that key is not unquie enough. Or the object that is the key doesn't have the equals and hashcode methods implemented.
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