Thanks for all the help. Embedding the dataScroller and dataTable within another JSF component worked.
-----Original Message----- From: Mike Kienenberger [mailto:[EMAIL PROTECTED] Sent: Tuesday, December 06, 2005 10:24 AM To: MyFaces Discussion Subject: Re: naming conventions in faces-config.xml Oops. I hadn't realized that we'd moved off the mailing list to private email. Yes, the problem is that he has superclass methods for get/setDataSource. ---------- Forwarded message ---------- From: Mike Kienenberger <[EMAIL PROTECTED]> Date: Dec 5, 2005 10:12 PM Subject: Re: naming conventions in faces-config.xml To: "[EMAIL PROTECTED]" <[EMAIL PROTECTED]> Aha! You've changed the name of the method. Is there already a get/setDataSource(javax.sql.DataSource) method defined in the superclass? There must be because you're calling it from this method! So there's no way for JSF to know which one to use. I'm guessing it's using the one which has a defined getter. The problem might go away if you create a matching getter...then again, it might not. The safest solution is to not overload the getDataSource method and use getJDBCDataSource (or getDs) instead. On 12/5/05, [EMAIL PROTECTED] <[EMAIL PROTECTED]> wrote: > Mike, > > thank you for your patience and effort trying to resolve this issue. > I just changed the essential parts to reproduce the error. > Here's the setter in CasesJdbcDAO: > > public void setDataSource(JDBCDataSource dataSource) { > if (log.isDebugEnabled()) log.debug("setting dataSource in casesDAO"); > this.ds = dataSource; > //the dataSource has to be updated after the bean has been injected > this.setDataSource(this.ds.getDs()); > } > > and the correlating snipplet of the faces-config.xml configuration file: > <managed-bean> > <description>this one retrieves the cases</description> > <managed-bean-name>casesDAOBean</managed-bean-name> > > <managed-bean-class>com.edegger.dao.springJDBC.CasesJdbcDAO</managed-bea n-class> > <managed-bean-scope>session</managed-bean-scope> > <managed-property> > <property-name>dataSource</property-name> > <value>#{jdbcDataSourceBean}</value> > </managed-property> > </managed-bean> > > Since the field ds is only used within the class CasesJdbcDAO, I don't need an > getter for this property. > And finally the signature of the class is: > > public class CasesJdbcDAO extends JdbcDaoSupport implements CasesDAO { > > whereas CasesDAO is the interface defining a methode to get all the cases as a > list. > With this configuration, I'm getting the 'javax.servlet.jsp.el.ELException: > Attempt to coerce a value of type "com.edegger.dao.springJDBC.JDBCDataSource" > to type "javax.sql.DataSource"' exception. > > To get rid off this exception, I'll need to apply the following chances: > > public void setDs(JDBCDataSource dataSource) { > if (log.isDebugEnabled()) log.debug("setting dataSource in casesDAO"); > this.ds = dataSource; > //the dataSource has to be updated after the bean has been injected > this.setDataSource(this.ds.getDs()); > } > > and the correlating snipplet of the faces-config.xml configuration file: > <managed-bean> > <description>this one retrieves the cases</description> > <managed-bean-name>casesDAOBean</managed-bean-name> > > <managed-bean-class>com.edegger.dao.springJDBC.CasesJdbcDAO</managed-bea n-class> > <managed-bean-scope>session</managed-bean-scope> > <managed-property> > <property-name>ds</property-name> > <value>#{jdbcDataSourceBean}</value> > </managed-property> > </managed-bean> > > The signature stays the same. > > I know something's not adding up - but I can't explain it. > > Enjoy, > > Kurt > > > > > Quoting Mike Kienenberger <[EMAIL PROTECTED]>: > > > Kurt, what does both your setter and getter code and method signatures > > look like on CasesJdbcDAO when you're getting this error? > > > > 'javax.servlet.jsp.el.ELException: Attempt to coerce a value of type > > "JDBCDataSource" to type "javax.sql.DataSource"' indicates an attempt > > to inject a JDBCDataSource into a value binding expecting a > > javax.sql.DataSource. > > > > Something's not adding up here. > > > > On 12/5/05, Kurt Edegger <[EMAIL PROTECTED]> wrote: > > > Hi Mike, > > > > > > thank you for your help, but I don't think that your answer is correct. > > > We are talking about two different classes. The first one is > > > CasesJdbcDAO with the setter taking an JDBCDataSource Object and the > > > second on is the JDBCDataSource class having a getDs() method to return > > > the actual javax.sql.DataSource object. To clearify: The JDBCDataSource > > > object is injected to CasesJdbcDAO using the setter in CasesJdbcDAO > > > which takes the correct type of JDBCDataSource. > > > I don't think this is an issue of a misscasted type since it works if > > > the field in CasesJdbcDAO (marked as [1] in my former postings) isn't > > > named 'dataSource'. In that case the JSF implementation seems to > > > interpret the name as a type and causing the exception. In the case it > > > isn't named 'dataSource' (e.g. 'ds' in my example) the injection is done > > > without any problems. > > > > > > I'm appreciating your help and thoughts. > > > > > > Kurt > > > > > > > > > > > > on 12/5/2005 8:54 AM Mike Kienenberger stated: > > > > Your setter and getter return different types. > > > > > > > > public DataSource getDs() > > > > > > > > needs to be > > > > > > > > public JDBCDataSource getDs() { > > > > > > > > On 12/2/05, Kurt Edegger <[EMAIL PROTECTED]> wrote: > > > > > > > >>Hi Mike, > > > >> > > > >>thank you for your response. > > > >> > > > >>on 12/2/2005 7:30 AM Mike Kienenberger stated: > > > >> > Can you post the setter method for ds in CasesJdbcDAO? > > > >> > > > >>Here are the crucial parts of CasesJdbcDAO: > > > >>/* the field definition [1]*/ > > > >>private JDBCDataSource ds; > > > >> > > > >>/* the setter*/ > > > >>public void setDs(JDBCDataSource dataSource) { > > > >> this.ds = dataSource; > > > >> this.setDataSource(this.ds.getDs()); > > > >>} > > > >> > > > >> > Also can you post the class definition line for JDBCDataSource? > > > >>The JDBCDataSource class is very simple and just holds an > > > >>javax.sql.DataSource object. Here are the interesting parts: > > > >> > > > >>/*the class definition */ > > > >>public class JDBCDataSource{ > > > >> > > > >> /*the javax.sql.DataSource*/ > > > >> private DataSource ds; > > > >> private String jndiLookup; > > > >>... > > > >> > > > >> public DataSource getDs() { > > > >> doLookup(); > > > >> return ds; > > > >> } > > > >> > > > >>} > > > >> > > > >> > > > >>The issue again: If I change the name of the field in CasesJdbcDAO at > > > >>position [1] to dataSource, and adjust the injection in faces-config.xml > > > >>accordingly the application crashes with the stated exception. > > > >> > > > >>Any ideas? > > > >> > > > >> Kurt > > > >> > > > > > > > > > > > > > On 12/5/05, Simon Kitching <[EMAIL PROTECTED]> wrote: > [EMAIL PROTECTED] wrote: > > Mike, > > > > thank you for your patience and effort trying to resolve this issue. > > I just changed the essential parts to reproduce the error. > > Here's the setter in CasesJdbcDAO: > > > > public void setDataSource(JDBCDataSource dataSource) { > > if (log.isDebugEnabled()) log.debug("setting dataSource in casesDAO"); > > this.ds = dataSource; > > //the dataSource has to be updated after the bean has been injected > > this.setDataSource(this.ds.getDs()); > > } > > > > and the correlating snipplet of the faces-config.xml configuration file: > > <managed-bean> > > <description>this one retrieves the cases</description> > > <managed-bean-name>casesDAOBean</managed-bean-name> > > > > <managed-bean-class>com.edegger.dao.springJDBC.CasesJdbcDAO</managed-bea n-class> > > <managed-bean-scope>session</managed-bean-scope> > > <managed-property> > > <property-name>dataSource</property-name> > > <value>#{jdbcDataSourceBean}</value> > > </managed-property> > > </managed-bean> > > > > Since the field ds is only used within the class CasesJdbcDAO, I don't need an > > getter for this property. > > And finally the signature of the class is: > > > > public class CasesJdbcDAO extends JdbcDaoSupport implements CasesDAO { > > > > Just as a guess, you don't have any methods on the base classes that > have similar names or signatures do you? eg: > > class JdbcDaoSupport { > public void setDataSource(...); > } > > > Regards, > > Simon > NOTICE: This message, including all attachments transmitted with it, is for the use of the addressee only. 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