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Plugin Design - XML-Dom and Java Heap - out of memory

little_luser - Apr 13, 2008 - 11:46 AM
Post subject: XML-Dom and Java Heap - out of memory

Hi there,
I'm trying to write a plugin that should do some XML handling.
The xml-file is loaded as an IFile to the local workspace. (so far so possible)

The next thing I want to do is to create a TreeViewer and fill it with the DOM of that XML file.

The code to create the TreeViewer reads like this:
(myStream is an IputStream from the IFile and Path is the filepath to the file on my local disc.)

Code:

public void createTreeView(InputStream myStream, String Path){
   System.out.println("CreateTreeView");
   treeView = new TreeViewer(window.getShell());
   Document dom = new XMLStuff(myStream).getParser(Path);
   treeView.add(dom, window.getWorkbench().getActiveWorkbenchWindow().getWorkbench());
}//public void CreateTreeView

I'm trying to created parser with the following lines of code:

Code:

public Document getParser (String myPath){
   DocumentBuilderFactory docFactory = DocumentBuilderFactory.newInstance();
   try{
      DocumentBuilder docBuilder = docFactory.newDocumentBuilder();
      Document myDoc = docBuilder.parse(myPath);
      return myDoc;
   }catch(ParserConfigurationException PCE){
      PCE.printStackTrace();
   }catch(IOException IOE){
      IOE.printStackTrace();
   }catch(SAXException SAXE){
      SAXE.printStackTrace();
   }//catch SAXException
   System.out.println("getParser returned null. sorry.");
   return null;
}//public Document getParser (String myPath)

The actuall dom I' trying to achive should be create like this:
(XMLUtil is a part of the TPTP Project.)

Code:

public Element loadXMLDom(){
if (myStream != null){
   System.gc();
//Hi there: The thing is that the following line causes a crash!
   Element dom = XMLUtil.loadDom(myStream, "MWEB");
   return dom;
}//if (myStream != null)
else
   System.err.println("Sorry, but the Stream is null - loadXMLDom()");
return null;
}//public GetXMLDom

But both - the parser and the loadDom-function - do just return a Java Memory out of heap error.

Can someone please be so kind and tell me the reason for that?
Thank you in advance.