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# System prepended metadata

title: Thessaloniki Not Only Java meetup

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# Thessaloniki Not Only Java meetup 

September 29th / **Kotlin for Java Developers** by *[Antonis Lilis](https://www.linkedin.com/in/alilis/)*


**Questions / comments for the presentation** (to be discussed when the talk ends or during the talk)

* Giorgos Gaganis: You showed Int as the numeric type are there primitive and object numeric types?(answered)
* Dimitris Kontokostas: How does Kotlin work with different java versions?(answered)
* Dimitris Kontokostas: does the variable setter work only with setZip("xyz") or also with zip = "xyz"(answered)
* Lefteris Chrysochoidis: Is there any conflict/issue with frameworks like Spring?
```
class X {
        var zip: String = ""
        private set
    }
    
    val x = X()
    x.zip = "sss"
    
```

το data class είναι σαν τα Java Beans;(answered)

Giorgos Gaganis: o !! operator θα σκασει NullPointerException όταν έχουμε null value, σωστα?(answered)

* Spyros A. : γτ override στο interface?(answered)
* Spyros A. : debug σε JS ή native?(answered)
* Spyros A. : βιβλιο ή course για Java Devs
> 




**General questions / comments**








