How can I open a PDF File and integrate it on my view?

Question

Hi everybody,
I try to solve the problem like this:
- Creating a context attribute "pdf" type byte
- Creating a view UI Element "MyPdf" type interactive form binding on the context attribute "pdf"
- Inserting the following code in the wddoinit:
IPrivateView.IcontextElement contextEle = wdContext.currentContextElement();
byte bytes = contextEle.getPdf();
try
  File file = new File("C:/text.pdf");
  FileOutputStrem os = new FileOutputStream(file);
  os.write(bytes);
  os.close();
  contextEle.setPdf(bytes);
catch (IOException e)
  e.printStackTrace();
I'm running it on a local machine with Netweaver 7.1 and get the following error message:
java.lang.ClassCastException: class java.lang.Byte:null incompatible with interface com.sap.......
If I delete the view UI Element there is no error message. What am I doing wrong???

Answer 1

Hi,
I'm sorry but it doesn't solve the problem. The error message is the same and it only appears if I have included the interactive form in the view.
If I delete the interactive form, there is no error and it seems that the coding in the wddoinit() Method works.
I've found a simple tutorial that describes my intention. But it works on webDynpro for Abap and uses Function Modules.
http://wiki.sdn.sap.com/wiki/display/WDABAP/ASimpleWebDynproApplicationtodisplayapdffileinthebrowser+window
Anybody know a similar tutorial but for WebDynpro for Java?