Re: itext prototype

[Scott Klement <rpg400-l@xxxxxxxxxxxxxxxx>]

Hi Basilio,

The error you posted is "java.lang.NoSuchMethodError":  This error is 
not related to the classpath.  If this had been a classpath error, it 
would've complained that it couldn't find a class definition -- but 
that's not the case here, here it says it can't find a method.

Java searches the class (which it has already found) to find the method. 
In order for it to find it, two different criteria have to match, the 
method name ("add" in this situation) and the method's 
signature('(Lcom.lowagie.text.Paragraph;)V" in this situation.  Both 
have to match, or it will give you the NoSuchMethodError that you've 
posted to this mailing list.

Now, I'm not completely familiar with iText, so I ran a quick Google 
search for the Javadocs for the com.lowagie.text.Document class.  I 
found them at the following link, but I have no idea if that's the same 
version that you're using:
http://www.docjar.com/docs/api/com/lowagie/text/Document.html

Although those Javadocs do mention an "add" method, there's no add 
method that matches your signature.  The signature is derived from the 
parameter types and return values.  Your prototype is looking for a 
method that accepts an Paragraph object as a parameter, and returns 
nothing (void).  However, the Javadocs reference an Add method that 
accepts any object that implements the Element interface, and returns a 
boolean value.   So it makes perfect sense that you'd receive the error 
you're receiving.

Instead, try something like this:

D ITXTElement      S               O   CLASS(*JAVA                  
D                                     :'com.lowagie.text.Element')


D AddParagraphToDocument...                                      
D                 PR              1N  ExtProc(*JAVA:             
D                                     'com.lowagie.text.Document':
D                                     'add')                     
D   peParagraph                       like(ITXTElement)        


When you call the method, you can still pass a Paragraph to it (as you 
were already doing) since Paragraph's implement the Element interface.  
So they're compatible with Elements.  But the prototype must reference 
the Eleemnt, not the Paragraph, or the signature will be wrong.

Hope that helps.


Basilio Merlino wrote:
>  I'm having trouble creating a prototype for the following java code:
>  
>  document.add(new Paragraph("Hello World") );
>
>  Here's what I have so far:
>
>  D jFileOutputStream...
>  D                 S               O   CLASS(*JAVA
>  D                                     :'java.io.FileOutputStream')
>
>  D Document        S               O   CLASS(*JAVA
>  D                                     :'com.lowagie.text.Document')
>
>  D ITXTParagraph   S               O   CLASS(*JAVA                  
>  D                                     :'com.lowagie.text.Paragraph')
>
>  D AddParagraphToDocument...                                      
>  D                 PR                  ExtProc(*JAVA:             
>  D                                     'com.lowagie.text.Document':
>  D                                     'add')                     
>  D   peParagraph                       like(ITXTParagraph)        
>
>   
>
>  D PdfDocument      S                   LIKE(Document)
>  D writerFile       S                   LIKE(jFileOutputStream)
>  D ThisWriter       S                   LIKE(PdfWriter)
>
>  D paragraph        S                   LIKE(ITXTParagraph)
>   /free
>   
>    // Document is created without errors (PdfDocument)
>    // file output stream is created without errors (writerFile)
>
>   // Paraghraph is created without errors (paragraph)
>
>   AddParagraphToDocument(Document:Paragraph);
>
>   /End-free
>
>  The error I get is: Message . . . . :   Java exception received when calling Java method.   
>  Cause . . . . . :   ....Java exception "java.lang.NoSuchMethodError: add" when calling
>    method "add" with signature "(Lcom.lowagie.text.Paragraph;)V" in class
>    "com.lowagie.text.Document".                                          
>
>  I've  checked everything and the spelling and capitalization is
>  correct for the prototype.
>  The jar file resides at /QIBM/UserData/Java400/ext, so this shouldn't be
>  a classpath issue as far as I know.
>  Can anyone tell me if they see anything wrong?
>
>  Thanks
>
>   
>
>  Basilio
>