java.net.No Route To Host Exception: No route to host: connect

[Km Mahesh]

I am getting above exception when i tried to access a local file through my application. Here is the code:

String filename = "C:\\users\\mahesh\\jDOM\\test.xml"; //args[0];
try {
// Build the document with SAX and Xerces, no validation
SAXBuilder builder = new SAXBuilder();
// Create the document
Document doc = builder.build(new File(filename).toURL());
// Output the document, use standard formatter
XMLOutputter fmt = new XMLOutputter();
fmt.output(doc, System.out);

DocType docType = doc.getDocType();
System.out.println("Element: " + docType.getElementName());
System.out.println("Public ID: " + docType.getPublicID());
System.out.println("System ID: " + docType.getSystemID());

} catch (Exception e) {
e.printStackTrace();
}


And here is the stack of error:


java.net.NoRouteToHostException: No route to host: connect
at java.net.PlainSocketImpl.socketConnect(Native Method)
at java.net.PlainSocketImpl.doConnect(Unknown Source)
at java.net.PlainSocketImpl.connectToAddress(Unknown Source)
at java.net.PlainSocketImpl.connect(Unknown Source)
at java.net.Socket.connect(Unknown Source)
at java.net.Socket.connect(Unknown Source)
at sun.net.NetworkClient.doConnect(Unknown Source)
at sun.net.www.http.HttpClient.openServer(Unknown Source)
at sun.net.www.http.HttpClient.openServer(Unknown Source)
at sun.net.www.http.HttpClient.<init>(Unknown Source)
at sun.net.www.http.HttpClient.New(Unknown Source)
at sun.net.www.http.HttpClient.New(Unknown Source)
at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(Unknown Source)
at sun.net.www.protocol.http.HttpURLConnection.plainConnect(Unknown Source)
at sun.net.www.protocol.http.HttpURLConnection.connect(Unknown Source)
at sun.net.www.protocol.http.HttpURLConnection.getInputStream(Unknown Source)
at org.apache.xerces.impl.XMLEntityManager.setupCurrentEntity(Unknown Source)
at org.apache.xerces.impl.XMLEntityManager.startEntity(Unknown Source)
at org.apache.xerces.impl.XMLEntityManager.startDTDEntity(Unknown Source)
at org.apache.xerces.impl.XMLDTDScannerImpl.setInputSource(Unknown Source)
at org.apache.xerces.impl.XMLDocumentScannerImpl$DTDDispatcher.dispatch(Unknown Source)
at org.apache.xerces.impl.XMLDocumentFragmentScannerImpl.scanDocument(Unknown Source)
at org.apache.xerces.parsers.XML11Configuration.parse(Unknown Source)
at org.apache.xerces.parsers.XML11Configuration.parse(Unknown Source)
at org.apache.xerces.parsers.XMLParser.parse(Unknown Source)
at org.apache.xerces.parsers.AbstractSAXParser.parse(Unknown Source)
at org.jdom.input.SAXBuilder.build(SAXBuilder.java:453)
at org.jdom.input.SAXBuilder.build(SAXBuilder.java:810)
at xmleditor.XmlEdit.main(XmlEdit.java:27)


Any help appreciated.

[Joe Ess]

Welcome to the JavaRanch.
I don't have JDOM installed, but I see in the documentation that there's a SAXBuilder.build method that takes a File rather than a URL. Why don't you try that?

[Km Mahesh]

Okay....the problem is not with URL passed to a build() method. Actually the
build() method of SAXBuilder class can take a File object, a URL of a File object and as well as a String object containing the File path.

The problem was with the XML file (web.xml) i was trying to load, here is the code snippet:

<?xml version="1.0" encoding="ISO-8859-1"?>
<!DOCTYPE web-app
    PUBLIC "-//Sun Microsystems, Inc.//DTD Web Application 2.2//EN"
    "http://java.sun.com/j2ee/dtds/web-app_2.2.dtd">
<web-app>
    <servlet>
        <servlet-name>snoop</servlet-name>
        <servlet-class>SnoopServlet</servlet-class>
    </servlet>
    <servlet>
        <servlet-name>file</servlet-name>
        <servlet-class>ViewFile</servlet-class>
        <init-param>
            <param-name>initial</param-name>
            <param-value>1000</param-value>
            <description>
                The initial value for the counter  <!-- optional -->
            </description>
        </init-param>
    </servlet>
    <servlet-mapping>
        <servlet-name>mv</servlet-name>
        <url-pattern>*.wm</url-pattern>
    </servlet-mapping>
    <distributed/>
    <security-role>
      <role-name>manager</role-name>
      <role-name>director</role-name>
      <role-name>president</role-name>
    </security-role>
</web-app>

After I tried to load a new simple XML file, it works fine...code snippet :

<?xml version="1.0" encoding="UTF-8"?>
<info>
  <sector>
    <attribname>Agriculture</attribname>
    <attribvalue>60</attribvalue>
  </sector>
  <sector>
    <attribname>Automobile</attribname>
    <attribvalue>15</attribvalue>
  </sector>
  <sector>
    <attribname>Infotech</attribname>
    <attribvalue>10</attribvalue>
  </sector>
</info>

Since i am newbie to XML, wondering what's wrong with the web.xml file? Is there any other way to load a XML file in jDOM?

[Joe Ess]

JDOM is trying to load the DTD. Try turning validation off.

[Km Mahesh]

Thanks Joe, the problem gets solved after removing the reference to the declared DTD.