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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