What causes the exception "Comparison operation requires compatible types. Found class java.lang.Character and class java.lang.String" ?

Solution Unverified - Updated -

Issue

  • While validating rules it throws exception whose root cause seem to be the following one.
Unable to Analyse Expression $bookProprerty.initials == 'T' && !isLoanable($bookProprerty.loanerID, $bookProprerty.authorInitials):
[Error: Comparison operation requires compatible types. Found class java.lang.Character and class java.lang.String]
[Near : {... !isLoanable ....}]
              ^
[Line: 39, Column: 8]

How to fix these sorts of issues in rules?

Environment

  • Red Hat JBoss BRMS (BRMS)
    • 5.x

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