13 replies to this topic

[toto_7]

Ok, thats very very weird. Im calling a java method in JSP that just decrease a value once and update an XML file. Problem is that instead of decrease it once, decreace it twice! Putted some System.out in my method one after value decreased and one at the end of method. When i click submit in tomcat window i have

Item decreased

Item decreased

End of method

End of method

Method is called just once from one place, FOR SURE! I and my tutors couldn't find the reason. However at the very first time, where TOMCAT starts when i submit i have

Item decreased

End of method

but page crashed with EOFexception.
I don't know really what happening. Anyone, any idea?

[WingedPanther]

Without seeing the code, no clue.

[toto_7]

Ok here is:
Method in java class

public void newQuantity() throws Exception{

		Document doc = DocumentBuilderFactory.newInstance().newDocumentBuilder().parse(

		new InputSource("c://apache-tomcat-6.0.29/webapps/ROOT/Milestones/store.xml"));

		

		for(int i=0; i<purchase.size(); i++){

			Purchase dlPurchase = (Purchase) purchase.get(i);

         

			XPath xpath = XPathFactory.newInstance().newXPath();

			NodeList node = (NodeList) xpath.evaluate(("/madShop/category/goodsItem[name='"+dlPurchase.getItem()+"']/quantity"), doc,XPathConstants.NODESET);

			

			System.out.println(dlPurchase.getItem());

			

			int quantity = Integer.parseInt(node.item(0).getTextContent());

			node.item(0).setTextContent(Integer.toString(quantity -1));

		}

		Transformer xformer = TransformerFactory.newInstance().newTransformer();

		FileOutputStream outStream = new FileOutputStream(new File("c://apache-tomcat-6.0.29/webapps/ROOT/Milestones/store.xml"));

		xformer.transform(new DOMSource(doc), new StreamResult(outStream));

		

		outStream.flush();

		outStream.close();

		

		this.saveMe();

		System.out.println("END");

}

And my JSp page:

PurchaseManager purchaseManager = new PurchaseManager("H:\\MadshopUsers\\purchase.obj");


if(checkout!=null){

	purchaseManager.newQuantity();

	purchaseManager.clearAll();

}



<a href="purchare.jsp?checkout=all"><button class="alt" style="top:350px; right:200px;"><img src="purchareBt.jpg" border=0 width="100" height="40"/></button></a>

[wim DC]

toto_7 said:

However at the very first time, where TOMCAT starts when i submit i have

Item decreased

End of method

but page crashed with EOFexception.
I don't know really what happening. Anyone, any idea?

This would indicate that there's nothing wrong with the newQuantity method, as otherwise you wouldn't even see "END" there. Meaning it happens at clearAll(), or even lower in the code we don't see.

[toto_7]

Here is my clearAll():

public void clearAll() throws IOException{

	purchase.clear();

	this.saveMe();

}

[wim DC]

What does saveme() do?

[toto_7]

private void saveMe() throws IOException

	{

		FileOutputStream fileOut = new FileOutputStream(this.filename);

		ObjectOutputStream objectOut = new ObjectOutputStream(fileOut);

		objectOut.writeObject(this.purchase);

		objectOut.close();

	}

[wim DC]

I also find it pretty weird to have a <button> inside an <a> tag, can you see what it does without the <button>, just <img> inside <a>?
(Also try flush() before closing in saveMe())

[toto_7]

nothing changed, still the same problem

[wim DC]

Okay, nothing else to do with the code you provided :P

[toto_7]

My tutors had all of the code and didnt find it also :P

[toto_7]

OK!! First you are mastermind, second explain me why please.
I didnt notice what you said me about <button> in a <a>, removed now and is perfect.
Why that was happening??