Question

Search string ‘4914904’ exists at the tail of the stream.

Here’s the code

    Scanner sc = new Scanner(xmlInputStream, "UTF-8");
    if(sc.findWithinHorizon('4914904', 0) != null) { // <--- exception is thrown here
    }

Any suggestions would be highly appreciated.

Answer 1

If you read the API for Scanner, you will see that if you pass the argument 0 to findWithinHorizon that it will read the entire buffer at once.

Since you don’t do anything with the value from this I see a few options.

Try changing to useDelimiter(String pattern) and then call if(sc.hasNext()) which may help some with the memory footprint.

If you have XML, use an XML parser instead of a text scanner.

You could consider writing a custom method which parses the input stream one line at a time and perform the search. That way you don’t have to read in the full buffer.

Increase the memory you give the jvm when it starts -Xmx256m

On a side note: Don’t re-write the code when you post here. Just copy and paste.