🤯 I'm having trouble with Kotlin + Spring magic (

@Transactional

) in following code:

class MyBoolean(var value: Boolean) {
    fun get(): Boolean = value
}

abstract class Foo {
    private val _hasError = MyBoolean(false)                                // <- line 16
    val hasError: Boolean get() = _hasError.get()
}

@Component
class MyFoo : Foo() {
    @Transactional
    fun doFoo() {
    }
}

class FooTest : SpringTest() {
    @Autowired
    lateinit var foo: MyFoo

    @Test
    fun `is null`() {
        assertThat(foo.hasError).isFalse                                    // <- line 33
        foo.doFoo()
    }
}

code/test above throws exception

java.lang.NullPointerException: Cannot invoke "com.bitsafe.behi.admin.projections.MyBoolean.get()" because "this._hasError" is null

at Foo.getHasError(FooTest.kt:16)
at <http://FooTest.is|FooTest.is> null(FooTest.kt:33)

which doesn't make sense as

_hasError

should never be

null

? If I remove

@Transactional

from

doFoo

method everything works as expected. What's going on? BTW problem also disappears if I put stuff from

abstract class Foo

directly into

class MyFoo

(which I don't want).

In the test

foo

is declared as lateinit - but not initialized.

Spring Boot 2.7.2 with Kotlin 1.7.10 and/or 1.6.21

this link indicates that making the property open may address this. Are you using the Gradle koting/spring plugin to set objects to open? (this requires @Component on the classes to take effect)

ok if I change

private val _hasError

to

open val _hasError

it works

cool. Adding @Component to the abstract class my also do it.

yes adding @Component also fixed it. thanks a lot!

you may also wanna consider the all-open/spring plugin