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java.lang.OutOfMemoryError: Java heap space in session.save()

Vijay Kumar Raman
Posts: 12
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I have developed a web application that runs on Tomcat6 (run from console \bin and not as windows service) and uses hibernate 3 for OR mapping and MYSQL as database. my requirement is I have to upload files of size upto maximum 100MB and persist them in a table column in the database using hibernate.

I read the FileInputStream directly into Hibernate Blob object using Hibernate.createBlob(FileInputStream obj) method. In hibernate Pojo class and hbm.xml file the corressponding column name type is declared as blob. when I execute this application I am able to upload files of size upto 25MB successfully. but when i try to upload file of size greater than 25MB it is throwing OutOfMemoryError: Java heap space

java.lang.OutOfMemoryError: Java heap space
at com.mysql.jdbc.Buffer.<init>(Buffer.java:59)
at com.mysql.jdbc.MysqlIO.sendSplitPackets(MysqlIO.java:3765)
at com.mysql.jdbc.MysqlIO.send(MysqlIO.java:3296)
at com.mysql.jdbc.MysqlIO.sendCommand(MysqlIO.java:1983)
at com.mysql.jdbc.MysqlIO.sqlQueryDirect(MysqlIO.java:2163)
at com.mysql.jdbc.ConnectionImpl.execSQL(ConnectionImpl.java:2624)
at com.mysql.jdbc.PreparedStatement.executeInternal(PreparedStatement.java:2127)
at com.mysql.jdbc.PreparedStatement.executeUpdate(PreparedStatement.java:2427)
at com.mysql.jdbc.PreparedStatement.executeBatchSerially(PreparedStatement.java:1980)
at com.mysql.jdbc.PreparedStatement.executeBatch(PreparedStatement.java:1451)
at org.hibernate.jdbc.BatchingBatcher.doExecuteBatch(BatchingBatcher.java:48)
at org.hibernate.jdbc.AbstractBatcher.executeBatch(AbstractBatcher.java:246)
at org.hibernate.engine.ActionQueue.executeActions(ActionQueue.java:237)
at org.hibernate.engine.ActionQueue.executeActions(ActionQueue.java:141)
at org.hibernate.event.def.AbstractFlushingEventListener.performExecutions(AbstractFlushingEventListener.java:298)
at org.hibernate.event.def.DefaultFlushEventListener.onFlush(DefaultFlushEventListener.java:27)
at org.hibernate.impl.SessionImpl.flush(SessionImpl.java:1000)
at org.hibernate.impl.SessionImpl.managedFlush(SessionImpl.java:338)
at org.hibernate.transaction.JDBCTransaction.commit(JDBCTransaction.java:106)

I tried commenting the hibernate session.save(objref); call and I am not getting the OutOfMemoryError.

Note: I am not supposed to use byte array to read the inputstream data into and then store it in database using hibernate since memory is a constraint for me. In mysql the max_allowed_packet size is 1024MB. kindly help.
Manuel Petermann
Ranch Hand
Posts: 177
Hibernate Linux Python
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In the thread upload-file-mysql-database-struts I already explained why i am against saving binary data, especially large ones in the database.
Save the path to the file in the database and save it to the filesystem.
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