Default - GREL-functions not found or working

[achiminator]

With the idea of building RML support into VS Code and documenting it, I started testing the various default functions with the rmlmapper-7.3.1-r374-all.jar on windows with openjdk 23.0.2 2025-01-21. Unfortunately, I figured that some functions do not work correctly:

• I cannot call any of the math functions, all of them (that I have tested) result in an error similar to: be.ugent.idlab.knows.functions.agent. functionInstantiation.exception.MethodNotFoundException: No suitable method 'abs' with matching parameter types found in class 'io.fno.grel.MathFunctions'.
• Some functions not part of the math section have either similar not found errors or other problems, listed in the table below.

I cannot yet make sense of this behavior, as the rest of the functions (mainly string, array, some date functions and all boolean except of xor) work fine. Is it due to some missing dependencies that I should have installed our is it a bug?

I shared the mapping (rml and yarrrml source) and csv file for reproducing. I added a .txt so github would let me upload it to the issue here, please remove the .txt after download.

cars.csv, rml.ttl.txt, functionTest problems.yarrrml.txt

name	part	uri	Problem
coalesce	other	http://users.ugent.be/~bjdmeest/function/grel.ttl#other_coalesce	13:27:42.037 [main] DEBUG b.u.i.k.functions.agent.AgentImpl   .getParameterValues(98) - finding value for parameter http://users.ugent.be/~bjdmeest/function/grel.ttl#p_any_rep_e 13:27:42.037 [main] WARN  b.u.i.k.f.a.d.DefaultDataTypeConverter.convert(21) - No DataTypeConverter found for class 'java.lang.String'; passing the object through 13:27:42.038 [main] ERROR be.ugent.rml.cli.Main               .run(442) - argument type mismatch
datePart	date	http://users.ugent.be/~bjdmeest/function/grel.ttl#date_datePart	java.lang.IllegalArgumentException: argument type mismatch
diff	date	http://users.ugent.be/~bjdmeest/function/grel.ttl#date_diff	be.ugent.idlab.knows.functions.agent.functionIntantiation.exception.MethodNotFoundException: No suitable method 'diff' with matching parameter types found in class 'io.fno.grel.DateFunctions'.
inc	date	http://users.ugent.be/~bjdmeest/function/grel.ttl#date_inc	be.ugent.idlab.knows.functions.agent.functionIntantiation.exception.MethodNotFoundException: No suitable method 'inc' with matching parameter types found in class 'io.fno.grel.DateFunctions'.
reinterpret	string	http://users.ugent.be/~bjdmeest/function/grel.ttl#string_reinterpret	Default functions input matches not with grel.ttl. Also: be.ugent.idlab.knows.functions.agent.functionIntantiation.exception.MethodNotFoundException: No suitable method 'reinterpret' with matching parameter types found in class 'io.fno.grel.StringFunctions'.
slice	array	http://users.ugent.be/~bjdmeest/function/grel.ttl#array_slice	be.ugent.idlab.knows.functions.agent.functionIntantiation.exception.MethodNotFoundException: No suitable method 'slice' with matching parameter types found in class 'io.fno.grel.ArrayFunctions'.
splitByLengths	string	http://users.ugent.be/~bjdmeest/function/grel.ttl#string_splitByLengths	be.ugent.idlab.knows.functions.agent.functionIntantiation.exception.MethodNotFoundException: No suitable method 'splitByLengths' with matching parameter types found in class 'io.fno.grel.StringFunctions'.
toNumber	string	http://users.ugent.be/~bjdmeest/function/grel.ttl#string_toNumber	be.ugent.idlab.knows.functions.agent.functionIntantiation.exception.MethodNotFoundException: No suitable method 'toNumber' with matching parameter types found in class 'io.fno.grel.StringFunctions'.
toString	string	http://users.ugent.be/~bjdmeest/function/grel.ttl#string_toString	Does not work as described in grel, has effect
xor	boolean	http://users.ugent.be/~bjdmeest/function/grel.ttl#boolean_xor	ERROR b.u.r.f.DynamicMultipleRecordsFunctionExecutor.execute(87) - Function 'http://users.ugent.be/~bjdmeest/function/grel.ttl#boolean_xor' failed to execute with class java.lang.String cannot be cast to class java.lang.Boolean (java.lang.String and java.lang.Boolean are in module java.base of loader 'bootstrap')