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The code below works, but the hibernate never gives hold of any object. Calling session.clear () to retrieve the next object also fails to free up memory before joining the difficulty in getting the class, and calling the session. The exception is caused by evict (currentObject) . Eventually I exhaust my pile space.
My heap dump is being checked, StatefulPersistenceContext is the root cause of garbage collector for pointing all references to my objects.
Public class CriteriaReportSource JRDataSource {Private Scrollable Respals sr; Private object current object; Personal criteria c; Personal Stable Ultimate Int scrollSize = 10; Private int offset = 1; Public Criteria Source (Criteria C) {this.c = c; AdvanceScroll (); } Private Zero Advancement () {// (Session) Chief. Mg. Delegate ()) clear (); This.sr = c.setFirstResult (offset) .setMaxResults (scrollSize) .scroll (ScrollMode.FORWARD_ONLY); Offset + = scroll size; } Public Boolean Next () {if (sr.next ()) {currentObject = sr.get (0); If (sr.isLast ()) {advanceScroll (); } Back true; } return false; } Public Object GetFieldValue (JRField jrf) throws JRException {Object Rated = empty; If (current object == zero) {return tap; } {RetVal = PropertyUtils.getProperty (try the current object, jrf.getName ()); } Hold (Exception Pre) {Logger.getLogger (CriteriaReportSource.class.getName ()) Login (Level.SEVERE, Null, Pre). } Return Rate Vals; }}
do not use a stateful session here , It's not just the right tool to run millions of rows and create a report instead.
If using MySQL connector / j is also not enough, you also have to defeat internal buffering by JDBC driver:
query query = Session.createQuery ( Query); Query.setReadOnly (true); // result for stream MIN_VALUE query.setFetchSize (Integer.MIN_VALUE) indicates JDBC driver; Scrollable result result = query.scroll (ScrollMode.FORWARD_ONLY); // Repeat on results (result.New ()) {object line = results.get (); // Process line then reference release / you may need to expel () as well} results.close (); 
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