XML DTD problem

[frenk_castle]

I have an xml file I want to validate.

XML file is:

<?xml version="1.0"?>
 <!DOCTYPE gridbag SYSTEM "gridbag.dtd">
 <gridbag>
    <row>
       <cell anchor="EAST">
          <bean>
             <class>javax.swing.JLabel</class>
             <property>
                <name>text</name>
                <value><string>Face: </string></value>
             </property>
          </bean>
       </cell>
       <cell fill="HORIZONTAL" weightx="100">
          <bean id="face">
             <class>javax.swing.JComboBox</class>
          </bean>
       </cell>
       <cell gridheight="4" fill="BOTH" weightx="100" weighty="100">
          <bean id="sample">
             <class>javax.swing.JTextArea</class>
             <property>
                <name>text</name>
                <value><string>The quick brown fox jumps over the lazy dog</string></value>
             </property>
             <property>
                <name>editable</name>
                <value><boolean>false</boolean></value>
             </property>
             <property>
                <name>lineWrap</name>
                <value><boolean>true</boolean></value>
             </property>
             <property>
                <name>border</name>
                <value>
                   <bean>
                      <class>javax.swing.border.EtchedBorder</class>
                   </bean>
                </value>
             </property>
          </bean>
       </cell>
    </row>
    <row>
       <cell anchor="EAST">
          <bean>
             <class>javax.swing.JLabel</class>
             <property>
                <name>text</name>
                <value><string>Size: </string></value>
             </property>
          </bean>
       </cell>
       <cell fill="HORIZONTAL" weightx="100">
          <bean id="size">
             <class>javax.swing.JComboBox</class>
          </bean>
       </cell>
    </row>
    <row>
       <cell gridwidth="2" weighty="100">
          <bean id="bold">
             <class>javax.swing.JCheckBox</class>
             <property>
                <name>text</name>
                <value><string>Bold</string></value>
             </property>
          </bean>
       </cell>
    </row>
    <row>
       <cell gridwidth="2" weighty="100">
          <bean id="italic">
             <class>javax.swing.JCheckBox</class>
             <property>
                <name>text</name>
                <value><string>Italic</string></value>
             </property>
          </bean>
       </cell>
    </row>
 </gridbag>

DTD file I use is

<!ELEMENT gridbag (row)*>
<!ELEMENT row (cell)*>
<!ELEMENT cell (bean)>
<!ATTLIST cell gridx CDATA #IMPLIED>
<!ATTLIST cell gridy CDATA #IMPLIED>
<!ATTLIST cell gridwidth CDATA "1">
<!ATTLIST cell gridheight CDATA "1">
<!ATTLIST cell weightx CDATA "0">
<!ATTLIST cell weighty CDATA "0">
<!ATTLIST cell fill (NONE|BOTH|HORIZONTAL|VERTICAL) "NONE">
<!ATTLIST cell anchor
    (CENTER|NORTH|NORTHEAST|EAST|SOUTHEAST|SOUTH|SOUTHWEST|WEST|NORTHWEST) "CENTER">
<!ATTLIST cell ipadx CDATA "0">
<!ATTLIST cell ipady CDATA "0">

<!ELEMENT bean (class, property*)>
<!ATTLIST bean id ID #IMPLIED>

<!ELEMENT class (#PCDATA)>
<!ELEMENT property (name, value)>
<!ELEMENT name (#PCDATA)>
<!ELEMENT value (int|string|boolean|bean)>
<!ELEMENT int (#PCDATA)>
<!ELEMENT string (#PCDATA)>
<!ELEMENT boolean (#PCDATA)>

I am getting an exception in this method:

public GridBagPane(String filename)
    {
        setLayout(new GridBagLayout());
        constraints = new GridBagConstraints();
        
        try
        {
            DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
            factory.setValidating(true);
            factory.setIgnoringElementContentWhitespace(true);
            
            DocumentBuilder builder = factory.newDocumentBuilder();
            File file = new File(filename);
            
            //added for debugging start
            FileInputStream fis = null;
            BufferedInputStream bis = null;
            DataInputStream dis = null;
            
            fis = new FileInputStream(file);
            bis = new BufferedInputStream(fis);
            dis = new DataInputStream(bis);

            while (dis.available() != 0) System.out.println(dis.readLine());
            //added for debbuging end
            
            Document doc = builder.parse(file);
            
            parseGridBag(doc.getDocumentElement());
        }
        catch (Exception e)
        {
            e.printStackTrace();
        }
    }

The line of code Document doc = builder.parse(file) is throwing an exception. I added the part of code between debugging comments to see if application is managing to find the file and create a valid File object. xml file is getting printed ok. I believe problem is either in location DTD file or in the structure or xml or DTD file. Since I copied both files from the book I believe most likely problem is that application can not find the DTD file.

I am using Eclipse. I have put both the xml and DTD file in the project directory in Eclipse workspace directory. I run application from Eclipse. Where should I put the DTD file or how to modify the <!DOCTYPE gridbag SYSTEM "gridbag.dtd"> so that application can find the DTD file. I have googled I lot and I can not find this.

Please help.

Thanks in advance.

[frenk_castle]

I managed to solve the problem. I did copy paste of the xml file and had blank characters before <?xml version="1.0"?>. When I removed them everything worked. Sorry to trouble you.