Help Needed on Read/Modify Line Statement

Hi,
I am writing a report which is having a check box as first column, followed by sales data. I am giving F4 Key to user to Select ALL the check box. I have used Modify Line to do this, but it is not working for me.
Here is the pseudo code which i am using.
Report <report name>.
data cb1 value SPACE.
Write :/ cb1 as CHECKBOX, 'X'.
Write :/ cb1 as CHECKBOX, 'Y'.
Write :/ cb1 as CHECKBOX, 'Z'.
AT PF04.
   DO 3 times.
      MODIFY LINE sy-index field value cb1 from 'X'.
   ENDDO.
This is not working and giving weird results.
I tried the following things too.
Trial a:
cb1 = 'X'.
modify line sy-index field value cb1.
Trial b:
modify line sy-index of current page value cb1 from 'X'.
Trial c:
read line sy-index....
modify line sy-index..
But none of them were working.
Please let me know if my approach to select all check box is correct. Is there any alternate way to select all the checkbox in the list?..What is wrong with my modify line statement.
Regards
Mitesh

Hi Anand,
Thanks for throwing a light on the "Read Statement". This cleared up my concept of modify line too.
When I dont use Read Line, the output will be:
Checked X
Checked X
Checked X
Let me try to answer the question as "Why it is happening".Correct me if i am wrong as i am only 15 days Old for ABAP ;-((.
Here is how I will now defining modify line statement. Modify Line Statement modify the current line or line number n with the value of sy-lisel. With Field Addition in Modify line, you change the content of sy-lisel.
So in our case, the sy-lisel value is (Checked,'X').
So if we dont use read line, only first column will get updated , whereas second field will remain in the sy-lisel.
So to get the value of other lines, we use read line. This will fill up the sy-lisel with the the line content of sy-index and so modify will work.
So, if we are using AT LINE-SELECTION event to select line, in that case, there is no need to do a read line as sy-lisel is already in the buffer.
Please correct me if i am wrong.
Regards
Mitesh

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long pos = 1; //indexing starts from 1
     byte[] bytes = blob.getBytes(pos, len);
in.close();
     return bytes;
catch (Exception e) {
     System.out.println(e.getMessage());
     return null;
PL/SQL wrapper is as follows:
CREATE OR REPLACE FUNCTION convertBlobToBytes(p1 IN BLOB) RETURN LONG RAW AUTHID CURRENT_USER AS LANGUAGE JAVA NAME 'convertBlob.convertBlobToBytes(java.sql.Blob) return byte[]';
I loaded this java class and pl/sql wrapper into the database using JDEVELOPER.
But I am getting the length of the file, as twice the size.
For example, When I run the program which reads the file returns the length of the file as a byte array, the length is 819.
When I pass the same file as a blob from apex, to the java program that converts blob to bytes, the length of the file is 1638.
And hence I am getting wrong results, further in the process.
Can you please help me? Any help is appreciated.
rgds,
Suma.

Hi all,
Can any of you please help me out?
rgds,
Suma.

Help needed to read exception

Hello,
I am having problems reading an exception stack and help would be appreciated.
Following is the exception I get:
Apr 15, 2004 5:18:36 PM com.sun.faces.lifecycle.InvokeApplicationPhase execute
SEVERE: #{OPCAdvancedQueryManagedBean.beanAction}: javax.faces.el.EvaluationException: java.lang.NullPointerException
javax.faces.FacesException: #{OPCAdvancedQueryManagedBean.beanAction}: javax.faces.el.EvaluationException: java.lang.NullPointerException
at com.sun.faces.application.ActionListenerImpl.processAction(ActionListenerImpl.java:78)
at javax.faces.component.UICommand.broadcast(UICommand.java:312)
at javax.faces.component.UIViewRoot.broadcastEvents(UIViewRoot.java:266)
at javax.faces.component.UIViewRoot.processApplication(UIViewRoot.java:380)
at com.sun.faces.lifecycle.InvokeApplicationPhase.execute(InvokeApplicationPhase.java:75)
at com.sun.faces.lifecycle.LifecycleImpl.phase(LifecycleImpl.java:200)
at com.sun.faces.lifecycle.LifecycleImpl.execute(LifecycleImpl.java:90)
at javax.faces.webapp.FacesServlet.service(FacesServlet.java:197)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:284)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:204)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:257)
at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:151)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:567)
at org.apache.catalina.core.StandardContextValve.invokeInternal(StandardContextValve.java:245)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:199)
at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:151)
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:509)
at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:149)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:567)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:184)
at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:151)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:164)
at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:149)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:567)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:156)
at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:151)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:567)
at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:972)
at org.apache.coyote.tomcat5.CoyoteAdapter.service(CoyoteAdapter.java:206)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:833)
at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.processConnection(Http11Protocol.java:732)
at org.apache.tomcat.util.net.TcpWorkerThread.runIt(PoolTcpEndpoint.java:619)
at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:688)
at java.lang.Thread.run(Thread.java:536)
Caused by: javax.faces.el.EvaluationException: java.lang.NullPointerException
at com.sun.faces.el.MethodBindingImpl.invoke(MethodBindingImpl.java:130)
at com.sun.faces.application.ActionListenerImpl.processAction(ActionListenerImpl.java:72)
... 33 more
Caused by: java.lang.NullPointerException
at com.sun.faces.context.SessionMap.put(ExternalContextImpl.java:555)
at com.softwareag.estela.opc.util.OPCSessionUtil.putTResponseIntoSession(OPCSessionUtil.java:35)
at com.softwareag.estela.opc.engine.OPCSearch.execute(OPCSearch.java:47)
at com.softwareag.estela.opc.jsf.OPCAbstractQueryManagedBean.beanAction(OPCAbstractQueryManagedBean.java:71)
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:324)
at com.sun.faces.el.MethodBindingImpl.invoke(MethodBindingImpl.java:126)
... 34 more
Apr 15, 2004 5:19:25 PM org.apache.catalina.core.StandardContext reload
Julien.

Hello all,
I am definitely stuck with this annoying NullPointerException.
I know for a fact that my response object is not null as I can print it out and a !=null test returns true. However I still get this npe exception. Some member variable of the response object must be null.
What's more, from the exception stack, can't we say the problem comes from the managed bean?
Can anyone help?
Here is my code:
public boolean execute() {
OPCServiceLocator service_locator = OPCServiceLocator.getInstance();
//TODO: externalize those two strings
TXMLObjectAccessor xmlObjectAccessor = service_locator.getTXMLObjectAccessor("http://localhost/tamino/prueba_2", "ibermarcreferencec");
TXQuery xquery = TXQuery.newInstance(opcquery.getXQuery() + footer);
try {
TResponse response = xmlObjectAccessor.xquery(xquery);
List list = OPCConvertUtil.convertResponseIntoDisplayableList(response);
if (response.hasQueryContent() && response != null) {
System.out.println("<--within block B-->");
OPCSessionUtil.putTResponseIntoSession(response);//error occurs here
OPCSessionUtil.putSearchResultsIntoSession(list);
System.out.println("<--within block E-->");
return response.hasQueryContent();
} catch (TXQueryException e) {
e.printStackTrace();
return false;
}Julien.

Help Needed on Read/Modify Line Statement

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