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From Clay Bruce <>
Subject [jexl] Unified jexl throws exception when processing white space in file
Date Sun, 22 Apr 2012 19:58:26 GMT
First off Thank you for the excellent library, it has been very useful
in my current project. 

However there are a couple of issues I have found.


Using UnifiedJexl with the following script will fail at line 2 and line
4 and line 5. 

Note: line numbers are only for reference, they are not in script 




3:$$ var x = 2;


5:     $$ var y = 9;                                        



The offending code is the method startsWith which can be found at line
1345  in


    protected int startsWith(CharSequence sequence, CharSequence
pattern) {

        int s = 0;

        while (Character.isSpaceChar(sequence.charAt(s))) {

            s += 1;


        sequence = sequence.subSequence(s, sequence.length());

        if (pattern.length() <= sequence.length()

                && sequence.subSequence(0,
pattern.length()).equals(pattern)) {

            return s + pattern.length();

        } else {

            return -1;




Problem is that sequence is not tested to see if the index is available
before trying to access it.



Using this non optimized code fixes the issue:


    protected int startsWith(CharSequence sequence, CharSequence
pattern) {


                String tempString = sequence.toString();

                int patternFoundAt =

                if(patternFoundAt != -1 ){

                                int result = patternFoundAt +

                                if( result >= sequence.length() )

                                                return  -1;


                                                return result;


                return patternFoundAt;



Code used to load the report is: 

                String templatePath                      =

                JexlEngine           engine                  = new

                UnifiedJEXL processor   = new UnifiedJEXL(engine);

                Reader scriptReader                       = new


                UnifiedJEXL.Template template =


                JexlContext context = new MapContext();


                StringWriter preprocessed = new StringWriter();

                template.evaluate(context, preprocessed );



This seems like a bug unless I am not using the library correctly?

Thank you once again for great library.








Clay Bruce

Web Developer

Quiktrak, Inc.


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