David R. Heffelfinger

1. How can I have a composite primary key in JPA?
   
   There are several ways to do it, this page explains them.
   
   
2. How can I prevent users from overwriting each other's changes to the database?
   
   Use the @Version annotation.
   
   
3. Is there a way to do bulk updates and/or deletes with the Java Persistence Query Language (JPQL)?
   
   Yes.
   
   

Since I just upgraded JavaDB, I figured this was a good time to upgrade to the latest version of roller as well. I was using roller 4.0, which is fairly up to date, but I figured it wouldn't hurt to upgrade to the latest, 4.0.1.

I simply downloaded roller 4.0.1, created a war file from the roller directory and deployed it to GlassFish, but for some reason the upgrade didn't go smoothly, I kept getting a "Roller Weblogger has not been bootstrapped yet" error.

I tried various ways of deploying, using asadmin, copying the war file to the autodeploy folder, etc, but I kept getting the same error. I restarted GlassFish several times, I restarted the database (JavaDB/Derby) several times, nothing seemed to solve the problem.

I then decided to reinstall roller 4.0 (thank goodness I made a backup), and it came back up successfully. After doing this, I then redeployed roller 4.0.1 using a different temporary context root, and this time, it installed successfully, asking me to upgrade the database. I did upgrade the database (the only thing that needs to be done when going from roller 4.0 to roller 4.0.1 is change the version number), and I had both roller 4.0 and 4.01 running in parallel with different context roots.

I then undeployed roller 4.0, and changed the context root of 4.0.1 to match the one I had in 4.0 (/roller), I am now in business.

Why wouldn't roller 4.0.1 just install over 4.0 is anyone's guess, however I was glad I was able to work around the issue.