Re: "String Index Out Of Range" Error

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RE class is not optimized for multithreaded applications
use static instance of REProgram instead...

try this...

public class Myclass {

  private static REProgram my_program = null;

  static{
        RECompiler compiler = new RECompiler();
        my_program = 
compiler.compile("^(([^:/?#]+):)?(//([^/?#]*))?([^?#]*)(\\?([^#]*))?(#(.*))?");
  }

  public void myMethod() {
      ...
      RE re = new RE(my_program);//thread-safe
      ...
  }
}

have a good time
Celestino :)

Rob Beckett wrote:

> Hi!
>
> I've struggled over this one for quite a while, and I'm hitting rock 
> bottom, so I've joined the mailing list to appeal to you for help, and 
> perhaps in future offer some help of my own. :)
>
> The code I'm working with involves the indexing spiders for 
> blogshares.com, a virtual stock market utilizing weblogs as companies. 
> Jakarta Regexp has been in use for some time to verify the URLs of 
> blogs added to the system, and perform additional tasks on those blogs 
> as needed. Recently I added Regexp functions to the main link parser 
> class itself, in this case taking a Vector of links from a parsed HTML 
> page and running each one through a RE match for validity/checking 
> before performing database comparisons. However, in doing that, the 
> spiders' log (powered by Log4J!) began including some rather 
> perplexing errors, two examples are included here. It happens on 
> average every five minutes, and I'm rather stumped. :-/
>
> The expression used in each case is initialized by:
> ---snip---
> private static RE urlcheck = new 
> RE("^(([^:/?#]+):)?(//([^/?#]*))?([^?#]*)(\\?([^#]*))?(#(.*))?");
> ---snip---
>
> 1. Attempting the main RE match against the 'href' string, which does 
> not occur if the string is empty or does not meet other criteria in 
> advance.
> ---snip---
> java.lang.StringIndexOutOfBoundsException: String index out of range: 58
>        at java.lang.String.charAt(String.java:444)
>        at org.apache.regexp.StringCharacterIterator.charAt(Unknown 
> Source)
>        at org.apache.regexp.RE.matchNodes(Unknown Source)
>        at org.apache.regexp.RE.matchNodes(Unknown Source)
>        at org.apache.regexp.RE.matchNodes(Unknown Source)
>        at org.apache.regexp.RE.matchNodes(Unknown Source)
>        at org.apache.regexp.RE.matchNodes(Unknown Source)
>        at org.apache.regexp.RE.matchNodes(Unknown Source)
>        at org.apache.regexp.RE.matchNodes(Unknown Source)
>        at org.apache.regexp.RE.matchNodes(Unknown Source)
>        at org.apache.regexp.RE.matchNodes(Unknown Source)
>        at org.apache.regexp.RE.matchNodes(Unknown Source)
>        at org.apache.regexp.RE.matchNodes(Unknown Source)
>        at org.apache.regexp.RE.matchNodes(Unknown Source)
>        at org.apache.regexp.RE.matchNodes(Unknown Source)
>        at org.apache.regexp.RE.matchNodes(Unknown Source)
>        at org.apache.regexp.RE.matchNodes(Unknown Source)
>        at org.apache.regexp.RE.matchNodes(Unknown Source)
>        at org.apache.regexp.RE.matchNodes(Unknown Source)
>        at org.apache.regexp.RE.matchNodes(Unknown Source)
>        at org.apache.regexp.RE.matchNodes(Unknown Source)
>        at org.apache.regexp.RE.matchNodes(Unknown Source)
>        at org.apache.regexp.RE.matchNodes(Unknown Source)
>        at org.apache.regexp.RE.matchNodes(Unknown Source)
>        at org.apache.regexp.RE.matchNodes(Unknown Source)
>        at org.apache.regexp.RE.matchNodes(Unknown Source)
>        at org.apache.regexp.RE.matchNodes(Unknown Source)
>        at org.apache.regexp.RE.matchNodes(Unknown Source)
>        at org.apache.regexp.RE.matchNodes(Unknown Source)
>        at org.apache.regexp.RE.matchNodes(Unknown Source)
>        at org.apache.regexp.RE.matchNodes(Unknown Source)
>        at org.apache.regexp.RE.matchNodes(Unknown Source)
>        at org.apache.regexp.RE.matchNodes(Unknown Source)
>        at org.apache.regexp.RE.matchNodes(Unknown Source)
>        at org.apache.regexp.RE.matchNodes(Unknown Source)
>        at org.apache.regexp.RE.matchNodes(Unknown Source)
>        at org.apache.regexp.RE.matchNodes(Unknown Source)
>        at org.apache.regexp.RE.matchNodes(Unknown Source)
>        at org.apache.regexp.RE.matchNodes(Unknown Source)
>        at org.apache.regexp.RE.matchNodes(Unknown Source)
>        at org.apache.regexp.RE.matchNodes(Unknown Source)
>        at org.apache.regexp.RE.matchNodes(Unknown Source)
>        at org.apache.regexp.RE.matchNodes(Unknown Source)
>        at org.apache.regexp.RE.matchNodes(Unknown Source)
>        at org.apache.regexp.RE.matchNodes(Unknown Source)
>        at org.apache.regexp.RE.matchNodes(Unknown Source)
>        at org.apache.regexp.RE.matchNodes(Unknown Source)
>        at org.apache.regexp.RE.matchNodes(Unknown Source)
>        at org.apache.regexp.RE.matchNodes(Unknown Source)
>        at org.apache.regexp.RE.matchNodes(Unknown Source)
>        at org.apache.regexp.RE.matchNodes(Unknown Source)
>        at org.apache.regexp.RE.matchNodes(Unknown Source)
>        at org.apache.regexp.RE.matchNodes(Unknown Source)
>        at org.apache.regexp.RE.matchNodes(Unknown Source)
>        at org.apache.regexp.RE.matchNodes(Unknown Source)
>        at org.apache.regexp.RE.matchNodes(Unknown Source)
>        at org.apache.regexp.RE.matchNodes(Unknown Source)
>        at org.apache.regexp.RE.matchNodes(Unknown Source)
>        at org.apache.regexp.RE.matchNodes(Unknown Source)
>        at org.apache.regexp.RE.matchNodes(Unknown Source)
>        at org.apache.regexp.RE.matchNodes(Unknown Source)
>        at org.apache.regexp.RE.matchNodes(Unknown Source)
>        at org.apache.regexp.RE.matchNodes(Unknown Source)
>        at org.apache.regexp.RE.matchNodes(Unknown Source)
>        at org.apache.regexp.RE.matchNodes(Unknown Source)
>        at org.apache.regexp.RE.matchNodes(Unknown Source)
>        at org.apache.regexp.RE.matchNodes(Unknown Source)
>        at org.apache.regexp.RE.matchNodes(Unknown Source)
>        at org.apache.regexp.RE.matchNodes(Unknown Source)
>        at org.apache.regexp.RE.matchNodes(Unknown Source)
>        at org.apache.regexp.RE.matchNodes(Unknown Source)
>        at org.apache.regexp.RE.matchAt(Unknown Source)
>        at org.apache.regexp.RE.match(Unknown Source)
>        at org.apache.regexp.RE.match(Unknown Source)
>        at org.apache.regexp.RE.match(Unknown Source)
>        at com.blogshares.bot.LinkParser.parse(LinkParser.java:667)
>        at 
> com.blogshares.bot.LinkParser.workerThread(LinkParser.java:1007)
>        at com.blogshares.bot.LinkParser.run(LinkParser.java:1193)
>        at java.lang.Thread.run(Thread.java:534)
> ---snip---
>
> The input string:
> ---snip---
> http://doorknot.blogspot.com/2005/01/shady-in-de-alpen.html#comments
> ---snip---
>
> LinkParser.java:667:
> ---snip---
> boolean validURL = urlcheck.match(href);
> ---snip---
>
> 2. Attempting to retrieve the fifth parenthesized group from the 
> matched URL.
>
> Error Log:
> ---snip---
> java.lang.StringIndexOutOfBoundsException: String index out of range: -14
>        at java.lang.String.substring(String.java:1444)
>        at org.apache.regexp.StringCharacterIterator.substring(Unknown 
> Source)
>        at org.apache.regexp.RE.getParen(Unknown Source)
>        at com.blogshares.bot.LinkParser.parse(LinkParser.java:679)
>        at 
> com.blogshares.bot.LinkParser.workerThread(LinkParser.java:1007)
>        at com.blogshares.bot.LinkParser.run(LinkParser.java:1193)
>        at java.lang.Thread.run(Thread.java:534)
> ---snip---
>
> The input string:
> ---snip---
> http://roseqoloredlenses.blogspot.com/atom.xml
> ---snip---
>
> LinkParser.java:679:
> ---snip---
> String hrefPath  = urlcheck.getParen(5);
> ---snip---
>
> This is a multi-threaded application, running on the J2SDK V1.4.2 & 
> Jakarta Regexp V1.3, tested on more than one box with the same 
> results. Any ideas?
>
> Thanks & your time is appreciated,
>
> Rob Beckett
> http://www.blogshares.com/
>
>
>

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