Trying to invoke an expression rule with input parameter from my java plugin.

Hi girikumar, i don't think it's possible to call Appian Expression rules, Appian functions from Java code.

I think evaluateExpression should work. How are you constructing the NamedTypedValue? You should use the below constructor. Be sure to pass the parameter name and type. To determine type for an associated parameter, use the constants from AppianTypeLong.* (e.g. AppianTypeLong.STRING).

NamedTypedValue(java.lang.String name, java.lang.Long instanceType)

Example using Appian's enumerate() function -

NamedTypedValue var = new NamedTypedValue();
var.setName("input");
var.setInstanceType(AppianTypeLong.INTEGER);
var.setValue(3);

List<NamedTypedValue> list = new ArrayList<NamedTypedValue>();
list.add(var);

NamedTypedValue[] inputs = new NamedTypedValue[list.size()];
list.toArray(inputs);

TypedValue result = new TypedValue();
try {
result = pds.evaluateExpression("=enumerate(!input)",inputs);
} catch (ExpressionEvaluationException e) {
e.printStackTrace();
}
System.out.println(result);

@Abhi,
Above code is not working for me.
my expression rule "executeRule()" has one parameter of type integer. Tried the below piece of code but input is not getting passed.

LOG: Rule 'executerule' has 1 parameters, but instead passed 0 parameters.

Code:

NamedTypedValue var = new NamedTypedValue();
var.setName("pid");
var.setInstanceType(AppianTypeLong.INTEGER);
var.setValue(686);

List list = new ArrayList();
list.add(var);

NamedTypedValue[] inputs = new NamedTypedValue[list.size()];
list.toArray(inputs);

TypedValue result = new TypedValue();
try {
\tresult = pds.evaluateExpression("=executeRule()",inputs);
\t
} catch (Exception e) {
e.printStackTrace();
}

You should pass the input into the function -
result = pds.evaluateExpression("=executeRule(!pid)",inputs);

Thanks Abhi.... It worked by passing the input

@Abhi, Hi, I am doing the same syntax as above, but I am getting this error when I try to use evaluateExpression:
17:20:02,296 INFO [stdout] (http-/0.0.0.0:8080-33) 2016-03-30 17:20:02,294 [http-/0.0.0.0:8080-33] ERROR com.appiancorp.suiteapi.common.TypedValueParameterConverter - Cannot convert TypedValue
17:20:02,323 INFO [stdout] (http-/0.0.0.0:8080-33) java.lang.IllegalArgumentException: Argument is not an array

Do you know what could be the problem?

Thanks

Also, the rule input is a text array.

It could be that the second argument of your evaluateExpression ("inputs" in the example) is not an array. Is it possible to paste your code (or the relevant bits) here?

i think it was because I was using a load and local variables in the rule that I passed to the plugin function I made. I modified the code and it works fine now!