Re: PK Generation and FrontBase

Hello,

I switched my model from FrontBase to PostgreSQL and it works great.

Does someone use Cayenne 4.1 with FrontbaseSQL successfully ?

Is there something specific to know ?

Thank’s for any tip,

Jérémy

> Le 14 avr. 2021 à 23:05, Jérémy DE ROYER <[email protected]> a écrit :
> 
> Hi all,
> 
> I’m trying to find a solution for the (temporary ?) lack of horizontal inheritance so I did model vertical inheritance following :
> 
> https://cayenne.apache.org/docs/3.0/modeling-vertical-inheritance.html
> 
> using a Frontbase database.
> 
> I did :
> - create the model,
> - generate the database,
> - fix lack of jars and other things like username, password, jdbc driver
> 
> The demo code below starts well and connects to database...
> 
> try {
> ServerRuntime cayenneRuntime = ServerRuntime.builder()
> .addConfig("cayenne-CayenneTest.xml")
> .build();
> 
> ObjectContext context = cayenneRuntime.newContext();
> 
> Book _newBook = context.newObject(Book.class);
> _newBook.setTitle("Nouveau Book");
> _newBook.setCreated(new Date());
> 
> context.commitChanges();
> 
> EBook _newEBook = context.newObject(EBook.class);
> _newEBook.setTitle("Nouveau EBook");
> _newEBook.setCreated(new Date());
> _newEBook.setDownloadUrl("https://www.google.fr/");
> 
> context.commitChanges();
> 
> PaperBook _newPaperBook = context.newObject(PaperBook.class);
> _newPaperBook.setTitle("Nouveau PaperBook");
> _newPaperBook.setCreated(new Date());
> _newPaperBook.setShippingWeight(1000);
> 
> context.commitChanges();
> 
> List<Book> _books = ObjectSelect.query(Book.class).select(context);
> 
> System.out.println("** ALL **");
> 
> for (Book currentBook : _books)
> {
> System.out.println(currentBook.getTitle() + " created on " + currentBook.getCreated());
> }
> }
> catch (Exception e) {
> System.out.println("An error occured : " + e.getMessage());
> e.printStackTrace();
> }
> 
> …but throws this exception
> 
> An error occured : [v.4.1 Jul 14 2020 10:40:45] Commit Exception
> org.apache.cayenne.CayenneRuntimeException: [v.4.1 Jul 14 2020 10:40:45] Commit Exception
> at org.apache.cayenne.access.DataContext.flushToParent(DataContext.java:774)
> at org.apache.cayenne.access.DataContext.commitChanges(DataContext.java:691)
> at your.app.Application.<init>(Application.java:50)
> at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
> at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)
> at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
> at java.lang.reflect.Constructor.newInstance(Constructor.java:423)
> at java.lang.Class.newInstance(Class.java:442)
> at com.webobjects.appserver.WOApplication.main(WOApplication.java:547)
> at your.app.Application.main(Application.java:25)
> Caused by: java.lang.NullPointerException
> at org.apache.cayenne.access.jdbc.SQLTemplateAction.execute(SQLTemplateAction.java:242)
> at org.apache.cayenne.access.jdbc.SQLTemplateAction.runWithNamedParametersBatch(SQLTemplateAction.java:179)
> at org.apache.cayenne.access.jdbc.SQLTemplateAction.performAction(SQLTemplateAction.java:111)
> at org.apache.cayenne.access.DataNodeQueryAction.runQuery(DataNodeQueryAction.java:97)
> at org.apache.cayenne.access.DataNode.performQueries(DataNode.java:273)
> at org.apache.cayenne.dba.frontbase.FrontBasePkGenerator.longPkFromDatabase(FrontBasePkGenerator.java:143)
> at org.apache.cayenne.dba.JdbcPkGenerator.generatePk(JdbcPkGenerator.java:220)
> at org.apache.cayenne.access.DataDomainInsertBucket.createPermIds(DataDomainInsertBucket.java:168)
> at org.apache.cayenne.access.DataDomainInsertBucket.appendQueriesInternal(DataDomainInsertBucket.java:76)
> at org.apache.cayenne.access.DataDomainSyncBucket.appendQueries(DataDomainSyncBucket.java:78)
> at org.apache.cayenne.access.DataDomainFlushAction.preprocess(DataDomainFlushAction.java:185)
> at org.apache.cayenne.access.DataDomainFlushAction.flush(DataDomainFlushAction.java:143)
> at org.apache.cayenne.access.DataDomain.onSyncFlush(DataDomain.java:624)
> at org.apache.cayenne.access.DataDomain.onSyncNoFilters(DataDomain.java:594)
> at org.apache.cayenne.access.DataDomain$DataDomainSyncFilterChain.onSync(DataDomain.java:822)
> at org.apache.cayenne.tx.TransactionFilter.lambda$onSync$0(TransactionFilter.java:61)
> at org.apache.cayenne.tx.DefaultTransactionManager$BaseTransactionHandler.performInTransaction(DefaultTransactionManager.java:183)
> at org.apache.cayenne.tx.DefaultTransactionManager$BaseTransactionHandler.performInNewTransaction(DefaultTransactionManager.java:155)
> at org.apache.cayenne.tx.DefaultTransactionManager$NestedTransactionHandler.handle(DefaultTransactionManager.java:98)
> at org.apache.cayenne.tx.DefaultTransactionManager.performInTransaction(DefaultTransactionManager.java:65)
> at org.apache.cayenne.tx.DefaultTransactionManager.performInTransaction(DefaultTransactionManager.java:43)
> at org.apache.cayenne.tx.TransactionFilter.onSync(TransactionFilter.java:61)
> at org.apache.cayenne.access.DataDomain$DataDomainSyncFilterChain.onSync(DataDomain.java:821)
> at org.apache.cayenne.access.DataDomain.onSync(DataDomain.java:581)
> at org.apache.cayenne.access.DataContext.flushToParent(DataContext.java:742)
> ... 9 more
> 
> It seem’s to be related to pk generation so I try a select unqiue from Book in FrontBase and it worked lije a charm.
> 
> Any idea ?
> 
> Many thank’s,
> 
> Jérémy