Exception in thread "main" java.lang.OutOfMemoryError: Java heap space

Question

i have a huge XML file of size 9 MB. I need to parse it and store it in a MYSQL database. When i execute the program, it throws me out of memory error and only 12668 rows have been inserted into the database. I use SAX parser to parse the XML. i have also given the stack trace of the error below. Kindly let me know how to resolve the issue.
I have also changed the JAVA_OPTS to -Xms128m -Xmx512m but this didnt solve the issue.
Exception in thread "main" java.lang.OutOfMemoryError: Java heap space
at java.util.jar.Manifest$FastInputStream.<init>(Unknown Source)
at java.util.jar.Manifest$FastInputStream.<init>(Unknown Source)
at java.util.jar.Manifest.read(Unknown Source)
at java.util.jar.Manifest.<init>(Unknown Source)
at java.util.jar.JarFile.getManifestFromReference(Unknown Source)
at java.util.jar.JarFile.getManifest(Unknown Source)
at sun.misc.URLClassPath$JarLoader$2.getManifest(Unknown Source)
at java.net.URLClassLoader.defineClass(Unknown Source)
at java.net.URLClassLoader.access$000(Unknown Source)
at java.net.URLClassLoader$1.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClassInternal(Unknown Source)
at com.mysql.jdbc.Util.handleNewInstance(Util.java:430)
at com.mysql.jdbc.PreparedStatement.getInstance(PreparedStatement.java:561)
at com.mysql.jdbc.ConnectionImpl.clientPrepareStatement(ConnectionImpl.java:1395)
at com.mysql.jdbc.ConnectionImpl.prepareStatement(ConnectionImpl.java:4178)
at com.mysql.jdbc.ConnectionImpl.prepareStatement(ConnectionImpl.java:4077)
at DBManager.insertSchedules(DBManager.java:30)
at EPGParser.startElement(EPGParser.java:71)
at com.sun.org.apache.xerces.internal.parsers.AbstractSAXParser.startElement(Unknown Source)
at com.sun.org.apache.xerces.internal.parsers.AbstractXMLDocumentParser.emptyElement(Unknown Source)
at com.sun.org.apache.xerces.internal.impl.XMLNSDocumentScannerImpl.scanStartElement(Unknown Source)
at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl$FragmentContentDriver.next(Unknown Source)
at com.sun.org.apache.xerces.internal.impl.XMLDocumentScannerImpl.next(Unknown Source)
at com.sun.org.apache.xerces.internal.impl.XMLNSDocumentScannerImpl.next(Unknown Source)
at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl.scanDocument(Unknown Source)
at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(Unknown Source)
at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(Unknown Source)

Answer 1

Check your code where u set the connection query; there's a procedure in my DBConnection class, looks like this:
     public void setQuery(String query) throws SQLException {          
          this.query = conn.prepareStatement(query);
Should look the same for u, at least similar.
I set the query this way: dbConn.setQuery("insert into groups (id, code, sectionID, languageID, year, no_students) values (?,?,?,?,?,?)");
I had to insert 24,827 records into a table, and it throws the heap space exception u mentioned when it reaches 12,667. So what i did was to put dbConn.setQuery(...) outside the loop, and inside the loop it remains to set the parameters and execute the query from connection. It works for me. Hope will help u save some memory space.