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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