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https://issues.apache.org/jira/browse/JEXL-132?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13273205#comment-13273205
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freish commented on JEXL-132:
-----------------------------
Thank you for reply.This is a big help!
> divide zero error and others
> ----------------------------
>
> Key: JEXL-132
> URL: https://issues.apache.org/jira/browse/JEXL-132
> Project: Commons JEXL
> Issue Type: Bug
> Affects Versions: 2.1.1
> Environment: JEXL2.1.1 jdk1.5.0_22
> Reporter: freish
> Labels: jexl
>
> code snippet：
> String exp;
> Expression expression;
> JexlEngine engine = new JexlEngine();
>
> exp = "1/0";
> expression = engine.createExpression(exp);
> System.out.println(expression.evaluate(null));
> this will print 0.0,shoud it indicate an error by throwing exception or
> return value?
> ----------------------------------------------
> code snippet：
> exp = "1/0.0";
> expression = engine.createExpression(exp);
> System.out.println(expression.evaluate(null));
> this will print 0.0 too,but in fact it should return Infinity.
> ----------------------------------------------
> code snippet:
> exp = "Math.abs(-1)";
> expression = engine.createExpression(exp);
> System.out.println(expression.evaluate(null));
> I don't know whether this is a bug.JEXL cannot invoke java static method
> directly,it will throw an exception
> ----------------------------------------------
> code snippet:
> exp = "a.abs(-1)";
> class MyMath {
> public double abs(double d) {
> return Math.abs(d);
> }
> }
> Object obj = new MyMath();
> expression = engine.createExpression(exp);
> MapContext c = new MapContext();
> c.set("a", obj);
> System.out.println(expression.evaluate(c));
> er,this is very strange,if MyMath is not public(whether in a independent file
> or not),it will return null;but if MyMath is a public class,it will behave
> correctly
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