equals cannot convert from String to boolean

Question

I want to compare input String from Database in tMap component in Talend Open Studio. If my String is equal to "{}", I want to put there "nodata" string. Otherwise I leave the original input as it is.

My code in expression/filter in tMap:

(row1.parameter).equals("{}")?"nodata":row1.parameter

Error I'm getting:

Detail Message: Type mismatch: cannot convert from String to boolean

Do you have any suggestions?

Answer 1

Try to assign the result to a String variable, like

String someVariable = row1.parameter.equals("{}") ? "nodata" : row1.parameter;

because your expression returns a String… Are you assigning it to a Boolean? If yes, that will cause / be a type mismatch.

Answer 2

Assuming you're keeping the "Parameter" field, it sounds like your Output field that you are assigning 'Parameter' to is not a 'String' field, and is set as 'Boolean':

So the first point of call would be to check/change the output to a type of 'String':