Getting nearly double the length when reading byte[] from postgres with jpa

Question

I have an Image class that has a byte[] to contain the actual image data. I\'m able to upload and insert the image just fine in my webapp. When I attempt to display the im

Answer 1

Supplementary answer for GlassFish 3.x users (principles may apply to other app servers)

You may be inadvertently using an old PostgreSQL JDBC driver. You can test this by injecting a DataSource somewhere (e.g. an EJB) and executing the following on it:

System.out.println(ds.getConnection().getMetaData().getDriverVersion());

In my case, it was 8.3 which was unexpected since I was deploying with 9.1 drivers.

To find out where this was coming from:

System.out.println(Class.forName("org.postgresql.Driver").getProtectionDomain().getCodeSource().getLocation());

As it turned out for me, it was in the lib directory of my GlassFish domain. I'm not sure how it got there - GlassFish certainly doesn't ship that way - so I just removed it and the problem went away.