error appear while running application

Receive this error and it recommend me to report to author :
After this message pop up, the program become very lagging and hang until i force close its process from task manager


Error


Message:
com.objectdb.o._RollbackException: Failed to commit transaction: Java heap space
Level:
SEVERE
Stack Trace:
Failed to commit transaction: Java heap space
com.objectdb.o.JPE.g(JPE.java:89)
com.objectdb.o.ERR.f(ERR.java:60)
com.objectdb.o.OBC.onObjectDBError(OBC.java:1484)
com.objectdb.jpa.EMImpl.commit(EMImpl.java:290)
cz.vity.freerapid.gui.managers.DatabaseManager.saveCollection(DatabaseManager.java:60)
cz.vity.freerapid.gui.managers.FileListMaintainer.saveToDatabase(FileListMaintainer.java:183)
cz.vity.freerapid.gui.managers.FileListMaintainer$3.run(FileListMaintainer.java:200)
cz.vity.freerapid.gui.managers.DatabaseManager$2.doInBackground(DatabaseManager.java:157)
javax.swing.SwingWorker$1.call(Unknown Source)
java.util.concurrent.FutureTask$Sync.innerRun(Unknown Source)
java.util.concurrent.FutureTask.run(Unknown Source)
javax.swing.SwingWorker.run(Unknown Source)
java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
java.lang.Thread.run(Unknown Source)
Java heap space
com.objectdb.o.FIR.(FIR.java:44)
com.objectdb.o.VLV$t.(VLV.java:422)
com.objectdb.o.VLV.r(VLV.java:343)
com.objectdb.o.VLV.q(VLV.java:319)
com.objectdb.o.VLV.p(VLV.java:287)
com.objectdb.o.EVC.n(EVC.java:158)
com.objectdb.o.OBM.bL(OBM.java:816)
com.objectdb.o.OBM.bJ(OBM.java:729)
com.objectdb.jpa.EMImpl.commit(EMImpl.java:287)
cz.vity.freerapid.gui.managers.DatabaseManager.saveCollection(DatabaseManager.java:60)
cz.vity.freerapid.gui.managers.FileListMaintainer.saveToDatabase(FileListMaintainer.java:183)
cz.vity.freerapid.gui.managers.FileListMaintainer$3.run(FileListMaintainer.java:200)
cz.vity.freerapid.gui.managers.DatabaseManager$2.doInBackground(DatabaseManager.java:157)
javax.swing.SwingWorker$1.call(Unknown Source)
java.util.concurrent.FutureTask$Sync.innerRun(Unknown Source)
java.util.concurrent.FutureTask.run(Unknown Source)
javax.swing.SwingWorker.run(Unknown Source)
java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
java.lang.Thread.run(Unknown Source)

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I have attached the app.log for the error that i have encounter, hope that it could help to check what error it was.

That's probably because you have a very long list.

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