java - Problems communicating Business Layer (JPA) with Presentation Layer (Netbeans 7.x) -

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i develop "database based" java desktop application in following way:

  • develop data access layer (dal) using jpa (pojos generated netbeans 7.4)
  • develop business layer (bl) (my own classes, controllers, etc.)
  • develop presentation layer (pl): graphical user interfaces (panels, frames, dialogs)
  • making (pl) communicate (bl)

i developed (dal + bl) in single netbeans project (projectdbl.jar).

i developed pl in separate netbeans project (projectgui)

i importing projectdbl.jar projectgui compiled library.

i didn't add eclipselink libraries projectgui since added in projectdbl.jar.

i didn't add database driver library projectgui same reasons.

i separate between dal+bl , pl. further database modification (mysql->sqlserver example) should not impact done in pl.

the problem facing kind of exception raising when want invoke method in projectdbl.jar:

exception in thread "main" java.lang.noclassdeffounderror: javax/persistence/entitynotfoundexception

it seems if persistence unit must not instantiated external jar...

a compiled library doesn't include libraries uses. otherwize, every jar file 50mbs large, , end commonly used libraries being present several times in classpath.

you neet add every library use, directly or indirectly, classpath.


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