ADF BC : "clear search" using executeEmptyRowSet()

Question

hi
Consider a search page, similar to what you can see in this screen cast by Steve Muench:
"Part 3: Search Form Using View Object with Named Bind Parameters"
On such a page I would like to have a button that clears the search criteria and the search result.
I have implemented such a search page and "clear search" button in this example application:
http://www.consideringred.com/files/oracle/ClearSearchStuff-v0.01.zip
To implement the button I also used the executeEmptyRowSet() method in my Application Module on the "EmpWithParamsVOVI" View Object instance.
The "clear search" button uses this code in the backing bean:
public class SearchOnViewObjectParameters
     public String clearSearchCButtonAction()
          executeEmptyRowSetOnEmpWithParamsVOVI();
          ELHelper.set("#{bindings.EmployeeName.inputValue}",
               "#{bindings.EmployeeName.attributeDef.defaultValue}");
          ELHelper.set("#{bindings.LowSal.inputValue}",
               "#{bindings.LowSal.attributeDef.defaultValue}");
          ELHelper.set("#{bindings.HighSal.inputValue}",
               "#{bindings.HighSal.attributeDef.defaultValue}");
          return null;
     public String executeEmptyRowSetOnEmpWithParamsVOVI()
          BindingContainer bindings = getBindings();
          OperationBinding operationBinding =
                     bindings.getOperationBinding("executeEmptyRowSetOnEmpWithParamsVOVI");
          Object result = operationBinding.execute();
          if (!operationBinding.getErrors().isEmpty())
               return null;
          return null;
}The ADF Model binding calls this Application Module method:
public class ScottServiceImpl
     extends ApplicationModuleImpl
     implements ScottService
     public void executeEmptyRowSetOnEmpWithParamsVOVI()
          EmpWithParamsVOImpl vEmpWithParamsVOVI = getEmpWithParamsVOVI();
          vEmpWithParamsVOVI.executeEmptyRowSet();
}But it seems that the executeEmptyRowSet() method has not been documented:
http://download.oracle.com/docs/cd/B25221_04/web.1013/b16005/oracle/jbo/server/ViewObjectImpl.html#executeEmptyRowSet__
questions :
(1) Should I use the executeEmptyRowSet() to implement part of this "clear search" feature, or how exactly does this method behave (some documentation would be nice)?
(2) If not, what alternative should I use?
(using JDeveloper 10.1.3.3.0)
many thanks
Jan Vervecken
edit 20090925 : updated link to ClearSearchStuff-v0.01.zip

Answer 1

Hi,
This is regarding the clear search issue, I am trying to clear the search criteria filed and view object's result by using your code.
==============
public String clearSearchCButtonAction() {
System.out.println ("Entered clearSearchCButtonAction 1");
executeEmptyRowSetOnCustomerViewObj();
System.out.println ("Entered clearSearchCButtonAction 2");
ELHelper.set("#{bindings.CustomerId.inputValue}",
"#{bindings.CustomerId.attributeDef.defaultValue}");
return null;
public String executeEmptyRowSetOnCustomerViewObj()
System.out.println("1");
BindingContainer bindings = getBindings();
System.out.println("2");
OperationBinding operationBinding = bindings.getOperationBinding("executeEmptyRowSetOnCustomerViewObj");
System.out.println("3");
Object result = operationBinding.execute();
System.out.println("4");
if (!operationBinding.getErrors().isEmpty())
System.out.println("5");
return null;
return null;
=============
When I click the Clear button I am getting the following error.
[Starting OC4J using the following ports: HTTP=9012, RMI=23954, JMS=9258.]
C:\Jdeveloper\jdevstudio10133\jdev\system\oracle.j2ee.10.1.3.41.57\embedded-oc4j\config>
C:\Jdeveloper\jdevstudio10133\jdk\bin\javaw.exe -client -classpath C:\Jdeveloper\jdevstudio10133\j2ee\home\oc4j.jar;C:\Jdeveloper\jdevstudio10133\jdev\lib\jdev-oc4j-embedded.jar -Xverify:none -XX:MaxPermSize=256m -DcheckForUpdates=adminClientOnly -Doracle.application.environment=development -Doracle.j2ee.dont.use.memory.archive=true -Doracle.j2ee.http.socket.timeout=500 -Doc4j.jms.usePersistenceLockFiles=false oracle.oc4j.loader.boot.BootStrap -config C:\Jdeveloper\jdevstudio10133\jdev\system\oracle.j2ee.10.1.3.41.57\embedded-oc4j\config\server.xml
[waiting for the server to complete its initialization...]
May 19, 2008 1:33:39 AM com.evermind.server.jms.JMSMessages log
INFO: JMSServer[]: OC4J JMS server recovering transactions (commit 0) (rollback 0) (prepared 0).
May 19, 2008 1:33:39 AM com.evermind.server.jms.JMSMessages log
INFO: JMSServer[]: OC4J JMS server recovering local transactions Queue[jms/Oc4jJmsExceptionQueue].
Ready message received from Oc4jNotifier.
Embedded OC4J startup time: 12156 ms.
Target URL -- http://192.168.2.3:9012/Testing%20Clear-ViewController-context-root/faces/Clear.jspx
08/05/19 01:33:47 Oracle Containers for J2EE 10g (10.1.3.3.0) initialized
May 19, 2008 1:33:49 AM oracle.wireless.its.ra.TelnetResourceAdapter run
INFO: Industrial Telnet Server version: Version 10.1.3.0.0 started-up successfully.
May 19, 2008 1:33:53 AM com.sun.faces.config.rules.ConverterRule end
WARNING: [ConverterRule]{faces-config/converter} Merge(javax.faces.Short,null)
May 19, 2008 1:33:53 AM com.sun.faces.config.rules.ConverterRule end
WARNING: [ConverterRule]{faces-config/converter} Merge(null,java.lang.Short)
May 19, 2008 1:33:53 AM com.sun.faces.config.rules.ConverterRule end
WARNING: [ConverterRule]{faces-config/converter} Merge(javax.faces.Byte,null)
May 19, 2008 1:33:53 AM com.sun.faces.config.rules.ConverterRule end
WARNING: [ConverterRule]{faces-config/converter} Merge(null,java.lang.Byte)
May 19, 2008 1:33:53 AM com.sun.faces.config.rules.ConverterRule end
WARNING: [ConverterRule]{faces-config/converter} Merge(javax.faces.Integer,null)
May 19, 2008 1:33:53 AM com.sun.faces.config.rules.ConverterRule end
WARNING: [ConverterRule]{faces-config/converter} Merge(null,java.lang.Integer)
May 19, 2008 1:33:53 AM com.sun.faces.config.rules.ConverterRule end
WARNING: [ConverterRule]{faces-config/converter} Merge(javax.faces.Long,null)
May 19, 2008 1:33:53 AM com.sun.faces.config.rules.ConverterRule end
WARNING: [ConverterRule]{faces-config/converter} Merge(null,java.lang.Long)
May 19, 2008 1:33:53 AM com.sun.faces.config.rules.ConverterRule end
WARNING: [ConverterRule]{faces-config/converter} Merge(javax.faces.Float,null)
May 19, 2008 1:33:53 AM com.sun.faces.config.rules.ConverterRule end
WARNING: [ConverterRule]{faces-config/converter} Merge(null,java.lang.Float)
May 19, 2008 1:33:53 AM com.sun.faces.config.rules.ConverterRule end
WARNING: [ConverterRule]{faces-config/converter} Merge(javax.faces.Double,null)
May 19, 2008 1:33:53 AM com.sun.faces.config.rules.ConverterRule end
WARNING: [ConverterRule]{faces-config/converter} Merge(null,java.lang.Double)
May 19, 2008 1:33:53 AM com.sun.faces.config.rules.ValidatorRule end
WARNING: [ValidatorRule]{faces-config/validator} Merge(javax.faces.LongRange)
May 19, 2008 1:33:53 AM com.sun.faces.config.rules.ConverterRule end
WARNING: [ConverterRule]{faces-config/converter} Merge(javax.faces.DateTime,null)
May 19, 2008 1:33:53 AM com.sun.faces.config.rules.ConverterRule end
WARNING: [ConverterRule]{faces-config/converter} Merge(javax.faces.Number,null)
May 19, 2008 1:33:54 AM oracle.adf.share.config.ADFConfigFactory findOrCreateADFConfig
INFO: oracle.adf.share.config.ADFConfigFactory No META-INF/adf-config.xml found
May 19, 2008 1:33:57 AM oracle.adfinternal.view.faces.application.ViewHandlerImpl _checkTimestamp
INFO: ADF Faces is running with time-stamp checking enabled. This should not be used in a production environment. See the oracle.adf.view.faces.CHECK_FILE_MODIFICATION property in WEB-INF/web.xml
08/05/19 01:34:06 Entered clearSearchCButtonAction 1
08/05/19 01:34:06 1
08/05/19 01:34:06 2
May 19, 2008 1:34:06 AM com.sun.faces.lifecycle.InvokeApplicationPhase execute
SEVERE: #{backing_Clear.clearSearchCButtonAction}: javax.faces.el.EvaluationException: java.lang.NullPointerException
javax.faces.FacesException: #{backing_Clear.clearSearchCButtonAction}: javax.faces.el.EvaluationException: java.lang.NullPointerException
     at com.sun.faces.application.ActionListenerImpl.processAction(ActionListenerImpl.java:98)
     at oracle.adf.view.faces.component.UIXCommand.broadcast(UIXCommand.java:211)
     at javax.faces.component.UIViewRoot.broadcastEvents(UIViewRoot.java:287)
     at javax.faces.component.UIViewRoot.processApplication(UIViewRoot.java:401)
     at com.sun.faces.lifecycle.InvokeApplicationPhase.execute(InvokeApplicationPhase.java:95)
     at com.sun.faces.lifecycle.LifecycleImpl.phase(LifecycleImpl.java:245)
     at com.sun.faces.lifecycle.LifecycleImpl.execute(LifecycleImpl.java:110)
     at javax.faces.webapp.FacesServlet.service(FacesServlet.java:213)
     at com.evermind.server.http.ResourceFilterChain.doFilter(ResourceFilterChain.java:65)
     at oracle.adfinternal.view.faces.webapp.AdfFacesFilterImpl._invokeDoFilter(AdfFacesFilterImpl.java:228)
     at oracle.adfinternal.view.faces.webapp.AdfFacesFilterImpl._doFilterImpl(AdfFacesFilterImpl.java:197)
     at oracle.adfinternal.view.faces.webapp.AdfFacesFilterImpl.doFilter(AdfFacesFilterImpl.java:123)
     at oracle.adf.view.faces.webapp.AdfFacesFilter.doFilter(AdfFacesFilter.java:103)
     at com.evermind.server.http.EvermindFilterChain.doFilter(EvermindFilterChain.java:15)
     at oracle.adf.model.servlet.ADFBindingFilter.doFilter(ADFBindingFilter.java:162)
     at com.evermind.server.http.ServletRequestDispatcher.invoke(ServletRequestDispatcher.java:621)
     at com.evermind.server.http.ServletRequestDispatcher.forwardInternal(ServletRequestDispatcher.java:370)
     at com.evermind.server.http.HttpRequestHandler.doProcessRequest(HttpRequestHandler.java:871)
     at com.evermind.server.http.HttpRequestHandler.processRequest(HttpRequestHandler.java:453)
     at com.evermind.server.http.HttpRequestHandler.serveOneRequest(HttpRequestHandler.java:221)
     at com.evermind.server.http.HttpRequestHandler.run(HttpRequestHandler.java:122)
     at com.evermind.server.http.HttpRequestHandler.run(HttpRequestHandler.java:111)
     at oracle.oc4j.network.ServerSocketReadHandler$SafeRunnable.run(ServerSocketReadHandler.java:260)
     at com.evermind.util.ReleasableResourcePooledExecutor$MyWorker.run(ReleasableResourcePooledExecutor.java:303)
     at java.lang.Thread.run(Thread.java:595)
Caused by: javax.faces.el.EvaluationException: java.lang.NullPointerException
     at com.sun.faces.el.MethodBindingImpl.invoke(MethodBindingImpl.java:150)
     at com.sun.faces.application.ActionListenerImpl.processAction(ActionListenerImpl.java:92)
     ... 24 more
Caused by: java.lang.NullPointerException
     at tc.view.backing.ClearSearch.executeEmptyRowSetOnCustomerViewObj(ClearSearch.java:57)
     at tc.view.backing.ClearSearch.clearSearchCButtonAction(ClearSearch.java:46)
     at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
     at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
     at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
     at java.lang.reflect.Method.invoke(Method.java:585)
     at com.sun.faces.el.MethodBindingImpl.invoke(MethodBindingImpl.java:146)
     ... 25 more
===========================================
Would you please help me on this.