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I have a Maven project with Kotlin code hello.kt which calls Java code JavaFoo.java which calls Kotlin code KotlinFoo.kt. hello.kt also calls KotlinFoo.kt directly. I'm trying to build this with mvn clean install using exactly the Maven settings described in kotlinlang's Maven docs.

If hello.kt doesn't call JavaFoo (but I leave JavaFoo in the project) then this builds just fine.

The docs say that the Kotlin compiler should be invoked before the Java compiler, which suggests to me that all Kotlin code needs to compile before any Java code, i.e. with this setup you can call Kotlin from Java but not vice versa. However, the docs describe this setup as just "mixed code applications", not "calling Kotlin from Java".

In other words, this failure seems consistent with what the docs seem to imply but not with what they directly say -- or I'm just misunderstanding something.

I want to call each language from the other. Is there a Maven configuration that will do this, please?

(I looked at various StackExchange questions on mixed code settings and none of the solutions works for me.)

Adding the code as requested: pom.xml:

This is my first question on Stack Overflow, so apologies in advance if I'm asking in an improper way.

I'm trying to create a basic app in Kotlin, wherein I have a hamburger menu with some fragments in it. When the user clicks on the HomeFragment, I want to display a welcome message with his name (stored in a Shared Preferences object).

However, each time I click on the menu button to open the fragment, it crashes - even if I remove the whole username/shared prefs thing and just try to set some plain text.

Here is my HomeFragment.kt file:

1.I have a problem about creating a handler in a child thread

like

I'm trying to make a simple REST request with Retrofit in kotlin and i'm getting a lot of GC errors. I really don't know how to fix it. I tried to put more memory on emulator but the problem still happens.

My Code is: