Hi, i am trying to switch to James3 in Eclipse, and there are errors reported by eclipse inside the JPA mailbox project.
"The Java class for mapped type "MailboxMessage" must define a non-private zero-argument constructor" "The Java class for mapped type "org.apache.james.mailbox.jpa.mail.model.openjpa.AbstractJPAMailboxMessage" must define a non-private zero-argument constructor" The JPA JSR states: The entity class must have a no-arg constructor. The entity class may have other constructors as well. The no-arg constructor must be public or protected. http://download.oracle.com/otndocs/jcp/persistence-2_1-fr-spec/index.html JSR -338 Final, Release 2.1, Page 23. So the JPA standard is very strict on this. This no-arg constructor may not be used directly by your implementation, but may be used by e.g. copying objects between remote processes, as I understand. This may not be true for "openjpa", I don't know. See also: http://stackoverflow.com/questions/2808747/why-does-jpa-require-a-no-arg-constructor-for-domain-objects Is the maintainer of the project able to define "no-arg" constructors? Project: apache-james-mailbox-jpa Package: org.apache.james.mailbox.jpa.mail.model.openjpa Greetings Bernd.
