Compiler error on overloaded AssertJ method

[johanwannheden]

The following valid Java code fails to compile in Xtend:

org.assertj.core.api.Assertions.<MyType>assertThat(myEntity).isNotNull();

Whereas MyType refers to a type generated by EMF.

With the following Xtend code:

org.assertj.core.api.Assertions::<MyType>assertThat(myEntity).isNotNull()

the Xtend editor shows this error:

Bounds mismatch: The type argument is not a valid substitute for the bounded type parameter <T extends Comparable<? super T>> of the method assertThat(T)

And this code:

assertThat(myEntity).isNotNull()

results in the following error:

Type mismatch: cannot convert from EObject to BigDecimal

Xtend version used is 2.19.0.

[cdietrich]

same issue as https://github.com/eclipse/xtext/issues/2298 ?

[johanwannheden]

Might be related, hard for me to tell. The message relating to the BigDecimal type is bogus, the assertThat(BigDecimal) method just happens to be the first method declared in the AssertJ Assertions class.

[cdietrich]

@szarnekow any idea what could cause this?

[szarnekow]

I assume it is caused by all type parameters on the overloads having the same name 🤕

[szarnekow]

In other words, some invalid shadowing kicking in when looking up JvmOperations on JvmDeclaredTypes

I've this on my list to investigate further.