Parse large XML file with java

Question

I'm trying to read a huge XML file(2GB). So, I started of to use STAX and I've to use steam input. Below is the code

filePath = "D:/Data/sample.xml"; //Correct path
String tagContent = null;
XMLInputFactory factory = XMLInputFactory.newInstance();
XMLStreamReader reader = null;
try{
    System.out.println("here");
    reader = factory.createXMLStreamReader(ClassLoader.getSystemResourceAsStream(filePath));
    System.out.println("Reader1:" + reader);
}
catch(Exception e)
{
    System.out.println("Error 4:" + e);
}
System.out.println("Reader2:" + reader);

Output returns error:

here
Error 4:javax.xml.stream.XMLStreamException: java.net.MalformedURLException
Reader2:null

How do I resolve this error?

I don't like your output. The second "Reader: null" doesn't come from the code you've pasted. — Benjamin
– Benjamin, Commented Mar 4, 2014 at 8:54

m-szalik · Accepted Answer · 2014-03-04 09:02:47Z

3

Method getSystemResourceAsStream opens for reading, a resource of the specified name from the search path used to load classes.

You are going to read a file so open a file stream:

        filePath = "D:/Data/sample.xml"; //Correct path
        String tagContent = null;
        XMLInputFactory factory = XMLInputFactory.newInstance();
        XMLStreamReader reader = null;
        try{
            System.out.println("here");
            reader = factory.createXMLStreamReader(new FileInputStream(new File(filePath)));
            System.out.println("Reader:" + reader);
        }
        catch(Exception e)
        {
            System.out.println("Error 4:" + e);
        }
        System.out.println("Reader:" + reader);

answered Mar 4, 2014 at 9:02

m-szalik

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Comments

Tech Agent · Accepted Answer · 2014-03-04 09:00:55Z

0

Following line appears to be throwing an exception

reader = factory.createXMLStreamReader(ClassLoader.getSystemResourceAsStream(filePath));

which causes reader to remain null. Most probably class loading is not successful.

answered Mar 4, 2014 at 9:00

Tech Agent

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Pablo Lozano · Accepted Answer · 2014-03-04 09:01:20Z

0

I think you filepath is not a valid URL: try with : file:///D:/Data/sample.xml

answered Mar 4, 2014 at 9:01

Pablo Lozano

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1 Comment

Pablo Lozano Over a year ago

Change System.out.println("Error 4:" + e); by System.out.println("Error 4:" + e.getMessage()); to check what is failing

Omer Obaid · Accepted Answer · 2014-03-04 09:44:52Z

0

ClassLoader.getSystemResourceAsStream(...) is using the system classloader. Just use this.getClass().getResoruceAsStream(...).

edited Mar 4, 2014 at 9:44

Omer Obaid

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answered Mar 4, 2014 at 9:02

Stefan

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