Name: akC57697 Date: 05/17/99



This bug was found by St.Petersburg Java SQE team (by Sergey Scherbakov).
 In JDK 1.2.2 method TableView.TableRow.replace(int, int, View[]) throws
NullPointerException (does not check params).
The example:
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import javax.swing.text.TableView;

import java.io.*;
import javax.swing.text.Element;
import javax.swing.text.LabelView;
import javax.swing.text.View;
import javax.swing.text.AttributeSet;
import javax.swing.text.SimpleAttributeSet;
import javax.swing.text.Document;
import javax.swing.text.DefaultStyledDocument;
import javax.swing.text.StyleConstants;
import javax.swing.ImageIcon;
import javax.swing.text.BadLocationException;

public class Test {

    public static void main(String argv[]) {

        TableView.TableRow c2 =
                new StubTableView(new StubElement("text")).
                new TableRow(new StubElement("text"));

        View[] views = { new LabelView(new StubElement("text 1")),
            new LabelView(new StubElement("text 2")),
            new LabelView(new StubElement("text 3")),
            new LabelView(new StubElement("text 4"))
        };

        View[] rviews = { new LabelView(new StubElement("text 5")),
            new LabelView(new StubElement("text 6")),
            new LabelView(new StubElement("text 7")),
            new LabelView(new StubElement("text 8"))
        };

        for (int i = 0; i < views.length; i++) {
            c2.append(views[i]);
        }

        c2.replace(c2.getViewCount()-2, rviews.length, rviews);
    }
}

class StubElement implements Element {
    Document document = new DefaultStyledDocument();
    SimpleAttributeSet attr;
    String context;

    public StubElement(String context) {
        this.context = context;
        attr = new SimpleAttributeSet();
        StyleConstants.setIcon( attr, new ImageIcon());
        document = new DefaultStyledDocument();
        try {
          document.insertString(0, context, new SimpleAttributeSet() );
        } catch(BadLocationException e) {}
    }

    public Document getDocument() {
        return document;
    }
    public Element getParentElement() { return null; }
    public String getName() { return "StubElement"; }
    public AttributeSet getAttributes() {
        return attr;
    }
    public int getStartOffset() { return 0; }
    public int getEndOffset() {
        return document.getLength();
    }
    public int getElementIndex(int offset) {
        return 0;
    }
    public int getElementCount() { return 1; }
    public Element getElement(int index) { return this; }
    public boolean isLeaf() { return true; }
}

class StubTableView extends TableView {
    public StubTableView(Element elem) {
        super( elem);
    }
}
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Output :
Exception in thread "main" java.lang.NullPointerException

        at javax.swing.text.CompositeView.replace(CompositeView.java, Compiled
Code)
        at javax.swing.text.BoxView.replace(BoxView.java, Compiled Code)
        at javax.swing.text.TableView$TableRow.replace(TableView.java, Compiled
Code)
        at Test.main(Test.java, Compiled Code)
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