Java fuzzer can't create any values for types with no public constructor (e.g. `LocalDateTime`)

[IlyaMuravjov]

Description

When creating instances of arbitrary classes Java fuzzer only considers their accessible constructors. However, some classes (e.g. LocalDateTime) only have private constructors while their instances are meant to be created using static methods.

Real world (concrete) example

Same as in #2428

To Reproduce

Run the following unit test.

@Test
fun `fuzzer can create instances of classes without public constructors but with static factory method in their class`() {
    var seenLocalDateTime = false
    runBlockingWithContext {
        runJavaFuzzing(
            TestIdentityPreservingIdGenerator,
            methodUnderTest = LocalDateTime::getMinute.javaMethod!!.executableId,
            constants = emptyList(),
            names = emptyList(),
        ) { thisInstance, _, _ ->
            val control = runCatching {
                ValueConstructor()
                    .construct(listOfNotNull(thisInstance?.model))
                    .singleOrNull()?.value
            }.getOrNull()?.let { constructedThisInstance ->
                assertInstanceOf(LocalDateTime::class.java, constructedThisInstance)
                seenLocalDateTime = true
                Control.STOP
            } ?: Control.CONTINUE
            BaseFeedback(Trie.emptyNode(), control)
        }
    }
    assertTrue(seenLocalDateTime) { "No value was generated for type LocalDateTime" }
}

Expected behavior

Test passes.

Actual behavior

Test fails.

Visual proofs (screenshots, logs, images)

No value was generated for type LocalDateTime ==> expected: <true> but was: <false>

[alisevych]

@IlyaMuravjov
Could you please explain expected and actual behavior more in detail?
Here it is expected to use LocalDateTime static methods to instantiate it.