Apache Cayenne > Index > Cayenne FAQ

Some frequently asked questions are answered on this page.

  1. Cayenne General FAQ
    1. How do I get help with Cayenne?
    2. Cayenne History
    3. How do I submit a patch?
  2. Cayenne Features FAQ
    1. Does Cayenne Work with JSP or Struts or Tapestry or ...
    2. How Does Cayenne Compare With WebObject's EOF, Hibernate, other ORM?
    3. Are Nested Data Contexts Supported?
    4. Is Inheritance Supported?
    5. What is Optimistic Locking?
  3. Cayenne Modeler FAQ
    1. Where can I find the Preferences File?
    2. How can I map DbAttribute to a database-specific data type?
  4. Cayenne Usage FAQ
    1. How do I Fetch an Object By its Primary Key?
    2. How do I make Cayenne generate getters and setters for my primary key?
    3. Where do I put 'cayenne.xml'?
    4. How do I initialize an object with default values?
    5. How do I delete an object from all to-many relationship lists that include it?
    6. How do I implement a Tapestry Squeezer for a DataObject
    7. How do I map aggregate queries?
    8. How do I set DB connection information via API?
    9. Are Unused Database Connections Closed?
    10. How do I select objects that do not have a certain other object in its to-many relationship?
    11. How do I use Cayenne with Maven2?
  5. Troubleshooting
    1. Why is my chained Expression not working?
    2. I am having problems with logging output. How do I trace them down?
    3. When my application is idle for a long period of time, I get 'connection was lost' or similar errors?
    4. MySQL Driver Throws com.mysql.jdbc.PacketTooBigException when saving large objects?
    5. HSQLDB has no data in the database after application exits