Hi Simone, OpenJPA currently supports (judging from test cases) streaming LOB with MySQL, Oracle, PostgreSQL and SQL Server. However, even with these databases there are bugs to fix. OPENJPA-1248 [1] contains a few stack traces some of which are similar to yours. Thus the exception you are getting from a newer Derby might be an OpenJPA fault.
[1] https://issues.apache.org/jira/browse/OPENJPA-1248 Regards, Milosz > Hi all, > I've been experimenting with the streaming LOB on Apache Derby and Hsql. > I'm using OpenJPA 1.2.0. > > On Hsql, it is not supported because it does not support select for update. > > On Derby 10.1.2.1 (reported as supported in > http://openjpa.apache.org/builds/1.2.0/apache-openjpa-1.2.0/docs/manual/manual.html#supported_databases) > > and up to 10.2.2.0 it does not work. An exception [1] is thrown when > trying persisting. > > On Derby 10.4.1.3, 10.4.2.0, 10.3.2.1 it fails with an exception, but > not when writing, during read operation [2]. Looking at derby source, > seems like an IOException is thrown when stream value is null. > > The same application works perfectly on different versions of MySQL, > both on windows and linux. > > Has anyone managed to have streaming lob working on Derby? Am I missing > some configuration option? > > Simone > > > > [1] > Caused by: SQL Exception: Feature not implemented: no details. > at org.apache.derby.impl.jdbc.Util.newEmbedSQLException(Unknown > Source) > at org.apache.derby.impl.jdbc.Util.newEmbedSQLException(Unknown > Source) > at org.apache.derby.impl.jdbc.Util.notImplemented(Unknown Source) > at org.apache.derby.impl.jdbc.EmbedBlob.setBinaryStream(Unknown > Source) > at > org.apache.openjpa.jdbc.sql.DBDictionary.updateBlob(DBDictionary.java:4310) > at > org.apache.openjpa.jdbc.meta.strats.LobFieldStrategy.customInsert(LobFieldStrategy.java:112) > at > org.apache.openjpa.jdbc.meta.FieldMapping.customInsert(FieldMapping.java:701) > at > org.apache.openjpa.jdbc.kernel.AbstractUpdateManager$CustomMapping.execute(AbstractUpdateManager.java:352) > at > org.apache.openjpa.jdbc.kernel.AbstractUpdateManager.flush(AbstractUpdateManager.java:94) > > [2] > Caused by: java.io.IOException > at > org.apache.derby.iapi.services.io.NewByteArrayInputStream.read(Unknown > Source) > at java.io.InputStream.read(InputStream.java:85) > > > -- > Simone Gianni CEO Semeru s.r.l. Apache Committer > http://www.simonegianni.it/ > >
