Do we need better documentation on the site?
Gary
On Mon, Aug 7, 2023, 5:45 AM Henri Biestro <hen...@apache.org> wrote:
> Hi;
> JEXL 3.3. has increased default security by restricting permissions to a
> very narrow set of allowed classes. In your case, you need to allow JEXL to
> introspect your package by configuring your permissions. Have a look at
> JexlPermissions javadoc for more explanations.
> On JEXL 3.3, with Java 17, If your test class resides in the 'org.example'
> package, the following code does run without errors.
> ...
> Map<String, Object> funcs = new HashMap<String, Object>();
> funcs.put("math", new MyMath());
> JexlPermissions permissions = JexlPermissions.parse("org.example.*");
> JexlEngine jexl = new
> JexlBuilder().permissions(permissions).namespaces(funcs).create();
> JexlContext jc = new MapContext();
> jc.set("pi", Math.PI);
> JexlExpression e = jexl.createExpression("math:cos(pi)");
> Object result = e.evaluate(jc);
> System.out.println("Result: " + result);
> ...
>
> Cheers
>
> On 2023/08/06 06:54:05 Aditya Kumar1 wrote:
> > Hi,
> >
> > I was trying to expose my own functions using JEXL library. I am trying
> the below example.
> >
> >
> > public static class MyMath {
> > public double cos(final double x) {
> > return Math.cos(x);
> > }
> > }
> >
> > public static void testCustomFunction2() {
> >
> > try {
> > Map<String, Object> funcs = new HashMap<String, Object>();
> > funcs.put("math", new MyMath());
> > JexlEngine jexl = new
> JexlBuilder().namespaces(funcs).create();
> > JexlContext jc = new MapContext();
> > jc.set("pi", Math.PI);
> > JexlExpression e = jexl.createExpression("math:cos(pi)");
> > Object result = e.evaluate(jc);
> > System.out.println("Result: " + result);
> > }
> > catch (JexlException e) {
> > Throwable original = e.getCause();
> > System.out.println(e.getMessage());
> > original.printStackTrace();
> > //do something with the original
> > }
> > }
> >
> > which is given at below link:
> >
> https://commons.apache.org/proper/commons-jexl/apidocs/org/apache/commons/jexl3/package-summary.html#usage
> >
> > When I run the above code, I get below exception.
> >
> > org.example.Main.testCustomFunction2:93@1:9 unsolvable function/method
> 'cos(Float)'
> > Exception in thread "main" java.lang.NullPointerException
> > at org.example.Main.testCustomFunction2(Main.java:100)
> > at org.example.Main.main(Main.java:33)
> >
> > Can someone, please help me with this? I think, this is a supported way
> to use custom functions or exposing my own/wrapper functions. I am using
> Java 11 to run the above example.
> >
> > Thanks,
> > Aditya
> >
> >
> >
> > —
> > Aditya Kumar1
> > Technology Architect
> > Precisely.com
> >
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