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Change #2: Change implementations of the Roller interface

When creating persistence strategy:

• If JDBC connection properties present, use them
  • Save errors in Servlet context attributes so we can show them later
• Else use JNDI data-source
  • Save errors in Servlet context attributes so we can show them later

Change #3: Change mail sending code

When creating mail-session

• If mail-host property is present, use it
• Else use JNDI mail-session

Change #4: Change RollerContext initialization

• Don't throw RuntimeException on DB connection error
• Instead, allow context to load so we can show error/upgrade pages to user
• Only run upgradeDatabaseIfNeeded if installation.auto option is false

Change #5: Add DatabaseStatusFilter that checks database configuration

• If DB connection fails
  • If installation.auto, show error page to explain what went wrong and how to fix it
  • Else, show simple error/maintenance page
• If DB does not have tables
  • If installation.auto, show table creation page/action
  • Else, show simple error/maintenance page
• If DB is older version
  • If installation.auto, show database upgrade page/action
  • Else, show simple error/maintenance page

Change #6: Table creation page/action

• Tell user that tables need to be created, offer to create them
• Create tables, show user output from running creation script
• Ask user to redeploy or restart server

Change #7: Table upgrade page/action

• Tell user that tables need to be updated, offer to upgrade them
• Upgrade tables, show user output from running upgrade script
• Ask user to redeploy or restart server

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