Re: How to set result lists permanently to be non read-only

[Miroslav Nachev]

Hi, I am not so familiar with JPA specification but this code is generated automatically from NetBeans 6 (Sun Reference Implementation for Java BluePrints and future IDEs) using TopLink (Sun/Oracle Reference Implementation for JPA) and with TopLink it is working fine. For the current case I can answer you why clear() is called but I think that this is not a problem. Jan Stola from Sun is more involved in BeansBinding technology and maybe he can explain in more details why JPA specification have to support clear() in this situation. Miro. Patrick Linskey wrote: Hi, Why is the clear() being called? The thing is, query return results are read-only; mutating the results doesn't really make sense. What would you expect the result of calling clear() to be? -Patrick On Nov 11, 2007 12:50 AM, Miroslav Nachev <[EMAIL PROTECTED]> wrote: The application is very simple. It is created automatically using NetBeans "New Project" and then "Database Desktop Application". By default it use TopLink and everything is working fine. When I change the EntityManager to OpenJPA in "persistence.xml" it is working in different way (not working properly) and this exception is thrown on refresh and when I try to create new record in detailTable. I forgot to inform you that I am created 2 tables which are related: MainTable and DetailTable. In current case MainTable are Persons and DetailTable are Person Address Details. I can send you the project in WinRAR format or ZIP but you can create it your self also getting the last NetBeans from NetBeans 6 Development Downloads <http://www.netbeans.info/downloads/dev.php>. 47 address_bookPU INFO [AWT-EventQueue-0] openjpa.Runtime - Starting OpenJPA 1.1.0-SNAPSHOT 188 address_bookPU INFO [AWT-EventQueue-0] openjpa.jdbc.JDBC - Using dictionary class "org.apache.openjpa.jdbc.sql.MySQLDictionary". 516 address_bookPU INFO [AWT-EventQueue-0] openjpa.Enhance - Creating subclass for "[class test.Persons, class test.AddressDetails]". This means that your application will be less efficient and will consume more memory than it would if you ran the OpenJPA enhancer. Additionally, lazy loading will not be available for one-to-one and many-to-one persistent attributes in types using field access; they will be loaded eagerly instead. data: [EMAIL PROTECTED] 2007-11-11 10:41:23 org.jdesktop.application.Task failed SEVERE: [EMAIL PROTECTED] failed: java.lang.UnsupportedOperationException: Result lists are read-only. java.lang.UnsupportedOperationException: Result lists are read-only. at org.apache.openjpa.lib.rop.AbstractResultList.readOnly( AbstractResultList.java:43) at org.apache.openjpa.lib.rop.AbstractResultList.clear( AbstractResultList.java:80) at org.apache.openjpa.kernel.DelegatingResultList.clear( DelegatingResultList.java:236) at org.jdesktop.observablecollections.ObservableCollections$ObservableListImpl.clear (ObservableCollections.java:324) at test.DesktopApplication1View$RefreshTask.doInBackground( DesktopApplication1View.java:272) at test.DesktopApplication1View$RefreshTask.doInBackground( DesktopApplication1View.java:247) at org.jdesktop.swingworker.SwingWorker$1.call(Unknown Source) at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java :303) at java.util.concurrent.FutureTask.run(FutureTask.java:138) at org.jdesktop.swingworker.SwingWorker.run(Unknown Source) at java.util.concurrent.ThreadPoolExecutor$Worker.runTask( ThreadPoolExecutor.java:885) at java.util.concurrent.ThreadPoolExecutor$Worker.run( ThreadPoolExecutor.java:907) at java.lang.Thread.run(Thread.java:619) Miro. On 11/10/07, Patrick Linskey <[EMAIL PROTECTED]> wrote: Can you post the full stack trace? -Patrick On Nov 10, 2007 12:38 PM, Miroslav Nachev <[EMAIL PROTECTED]> wrote: Hi, I try to use OpenJPA together with NetBeans 6 and I have the following exception: "java.lang.UnsupportedOperationException: Result lists are read-only." This exception is not thrown when I am using TopLink. Can you suggest me how to set permanently all result lists to be writable by default? Miro. -- Patrick Linskey 202 669 5907