What is the problem. There could be many reason why it is not working. Where is your servlet directory. Please exaplain the error and your directory structure and cut and paste your web.xml lines. Kettle
Most of the cases are handeled good with READ_COMMITED. It will allow Dirty and Phantom Read and most of the APP server WebSphere/Weblogic take care of tx management.
As SERIARLIZED will impose too much of constrain resulting into slow response. It depends how much control you want. Kettle
I will do both as looking at today's market it is good to have as many certification as possible. And you can avoid giving test with every job oppurtunity. Kettle
Decision is based on various aspects of the application and datbase you are going to use. As complex database access using CMP is very complicated and you have to manage many fine grained CMP's. So its not easy to say. Kettle
In addition to your understanding, JMS is used when you want to continue processing without worrying about the result of the last command/message you issued/sent. Yes, for option C JMS is good solution, and it satisfies the above condition. Kettle
It could be a IBM bug as we were getting security context error in 3.5.3. Also make sure you are not loosing connection to source of security authentication like edirectory or active directory.