With the idea of building RML support into VS Code and documenting it, I started testing the various [default functions](https://rml.io/docs/rmlmapper/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](https://github.com/user-attachments/files/19922059/cars.csv), [rml.ttl.txt](https://github.com/user-attachments/files/19922062/rml.ttl.txt), [functionTest problems.yarrrml.txt](https://github.com/user-attachments/files/19922063/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')