getFileName = Rule-Utility-Function (Function rule)

LookupList = Library name for the RUF

pega_wb = Ruleset Name where RUF is present

To call an RUF we use the syntax = Rulesetname_LibraryName.RUFName(Parameters).

To fix your issue,

please clear temp directory and try again.

It is very clear... Thank you very much for information.

1. How can we access the constant values in StatusConstants interface where it is defined com.pega.pegarules.api.util package?

Code:

String MsgInfo = StatusConstants.ERROR_INFORMATION_EXCEPTIONS;

Error:

String MsgInfo = StatusConstants.ERROR_INFORMATION_EXCEPTIONS;

^^^^^^^^^^^^^^^

StatusConstants cannot be resolved

2. In pega where we can use engine API?

We can use activity step in java method, function,HTML,HTML Fragment, Control,Correspondence, Correspondence Fragment,Edit Input,Edit Validate.

Is above list is correct?

Thanks in advance.

String MsgInfo = StatusConstants.ERROR_INFORMATION_EXCEPTIONS;

^^^^^^^^^^^^^^^

StatusConstants cannot be resolved

Access StatusConstants using full qualified name as below.

String MsgInfo = com.pega.pegarules.api.util.StatusConstants.ERROR_INFORMATION_EXCEPTIONS;

2. In pega where we can use engine API?

We can use activity step in java method, function,HTML,HTML Fragment, Control,Correspondence, Correspondence Fragment,Edit Input,Edit Validate.

Is above list is correct?

Yep! You can also write java in non-auto generated section rules.