[jira] Created: (JXPATH-139) Wrong xpath expression passed to extension function does not throw JXPathNotFoundException

[Petras (JIRA)]

Wrong xpath expression passed to extension function does not throw 
JXPathNotFoundException
------------------------------------------------------------------------------------------

                 Key: JXPATH-139
                 URL: https://issues.apache.org/jira/browse/JXPATH-139
             Project: Commons JXPath
          Issue Type: Bug
    Affects Versions: 1.3
            Reporter: Petras


If xpath expression, which do not map to bean properties, is passed to 
extension function, JXPathNotFoundException is not thrown. It seems 
inconsistent behaviour and it is difficult to test these expressions if they do 
not fail for example after code refactoring.

Here is a test case:


{code}
// Extension function
public static class StringFunctions {
        public static String left(String param, int len) {
                System.out.println("Received: '" + param + "'");
                if(param == null) return null;
                return param.substring(0, Math.min(len, param.length()));
        }
}
{code}

{code}
// Value object to use
public class VO {
        String value = null;
        public String getValue() { return value; }
        public void setValue(String value) { this.value = value; }
}

{code}
{code}
@Test
public void testLeftFunctionWrongPath() {
        VO vo = new VO();
        vo.setValue("1234567890");

        JXPathContext ctx = JXPathContext.newContext(vo);

        ctx.setFunctions(new ClassFunctions(StringFunctions.class, "util"));
        
        // OK, StringFunctions.left() receives "1234567890"
        path = "util:left(value, 5)";
        ctx.getValue(path);
        
        // JXPathNotFoundException is not thrown, StringFunctions.left() 
receives an empty string
        String wrongPath = "util:left(valueXXX, 5)";
        ctx.getValue(wrongPath);
}
{code}

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