I've got an error message that I don't understand: ``` val sqlServerDataSource = SQLServerDat...

# getting-started

[Klitos Kyriacou]

I've got an error message that I don't understand:

val sqlServerDataSource = SQLServerDataSource()
        sqlServerDataSource.url = myUrl
        sqlServerDataSource.user = myUser
        sqlServerDataSource.password = myPassword

The error is:

Cannot access 'password': it is public/*package*/ for synthetic extension in '<library Maven: com.microsoft.sqlserver:mssql-jdbc:10.2.0.jre17>'

There is no error on url or user; only on password. If I replace it with sqlServerDataSource.setPassword(myPassword) it works. But why can't I use the property syntax, and what exactly does the error message mean, and why only password has this error?

[Klitos Kyriacou]

It turns out that this seems to be caused by the Java class SQLServerDataSource having public void setPassword(String password) but only a package-private String getPassword() . This prevents Kotlin from synthesizing a password property.

Is this intentional, or is it a bug?

[Michael de Kaste]

It's definitely a weird visibility way sqlServerDataSource uses since it's literally impossible to recreate the same scenario in kotlin; this the field cannot be mapped properly to kotlin accessibility

[Michael de Kaste]

image.png

[Michael de Kaste]

so it seems that setPassword and getPassword should be actual functions you should access in kotlin as well. The fact you can directly access a "password" field is a bug I would say

[Vampire]

https://kotlinlang.org/docs/java-interop.html#getters-and-setters

Note that, if the Java class only has a setter, it isn't visible as a property in Kotlin because Kotlin doesn't support set-only properties.

[ephemient]

the Java functions are always accessible (up to visibility) even when Kotlin synthesizes a property