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POOutOfMemoryError: Java heap space
 

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  1. POOutOfMemoryError: Java heap space
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    <p>I'm having a problem with a java OutOfMemoryError. The program basically looks at mysql tables that are running on mysql workbench, and queries them to get out certain information, and then puts them in CSV files. </p> <p>The program works just fine with a smaller data set, but once I use a larger data set (hours of logging information as opposed to perhaps 40 minutes) I get this error, which to me says that the problem comes from having a huge data set and the information not being handled too well by the program. Or it not being possible to handle this amount of data in the way that I have.</p> <p>Setting Java VM arguments to -xmx1024m worked for a slightly larger data set but i need it to handle even bigger ones but it gives the error.</p> <p>Here is the method which I am quite sure is the cause of the program somewhere:</p> <pre><code>// CSV is csvwriter (external lib), sment are Statements, rs is a ResultSet public void pidsforlog() throws IOException { String[] procs; int count = 0; String temp = ""; System.out.println("Commence getting PID's out of Log"); try { sment = con.createStatement(); sment2 = con.createStatement(); String query1a = "SELECT * FROM log, cpuinfo, memoryinfo"; rs = sment.executeQuery(query1a); procs = new String[countThrough(rs)]; // SIMPLY GETS UNIQUE PROCESSES OUT OF TABLES AND STORES IN ARRAY while (rs.next()) { temp = rs.getString("Process"); if(Arrays.asList(procs).contains(temp)) { } else { procs[count] = temp; count++; } } // BELIEVE THE PROBLEM LIES BELOW HERE. SIZE OF THE RESULTSET TOO BIG? for(int i = 0; i &lt; procs.length; i++) { if(procs[i] == null) { } else { String query = "SELECT DISTINCT * FROM log, cpuinfo, memoryinfo WHERE log.Process = " + "'" + procs[i] + "'" + " AND cpuinfo.Process = " + "'" + procs[i] + "'" + " AND memoryinfo.Process = " + "'" + procs[i] + "' AND log.Timestamp = cpuinfo.Timestamp = memoryinfo.Timestamp"; System.out.println(query); rs = sment.executeQuery(query); writer = new CSVWriter(new FileWriter(procs[i] + ".csv"), ','); writer.writeAll(rs, true); writer.flush(); } } writer.close(); } catch (SQLException e) { notify("Error pidslog", e); } }; // end of method </code></pre> <p>Please feel free to ask if you want source code or more information as I'm desperate to get this fixed!</p> <p>Thanks.</p>
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    1. COHave you tried to use a [profiler](http://profiler.netbeans.org/)?
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      1. POOutOfMemoryError: Java heap space
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    2. COCan't you stream the results from the database into the file without having everything at once in memory?
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      1. POOutOfMemoryError: Java heap space
      1. USkutschkem
    3. CO`writer.close()` i.o. flush (inside the loop). Many opportunities to improve in the code; hire a programmer.
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      1. POOutOfMemoryError: Java heap space
      1. USJoop Eggen
 

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