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{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"Java fuzzer can't create any values for types with no public constructor (e.g. `LocalDateTime`)","articleBody":"**Description**\r\n\r\nWhen 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.\r\n\r\n**Real world (concrete) example**\r\n\r\nSame as in #2428 \r\n\r\n**To Reproduce**\r\n\r\nRun the following unit test.\r\n```kotlin\r\n@Test\r\nfun `fuzzer can create instances of classes without public constructors but with static factory method in their class`() {\r\n    var seenLocalDateTime = false\r\n    runBlockingWithContext {\r\n        runJavaFuzzing(\r\n            TestIdentityPreservingIdGenerator,\r\n            methodUnderTest = LocalDateTime::getMinute.javaMethod!!.executableId,\r\n            constants = emptyList(),\r\n            names = emptyList(),\r\n        ) { thisInstance, _, _ -\u003e\r\n            val control = runCatching {\r\n                ValueConstructor()\r\n                    .construct(listOfNotNull(thisInstance?.model))\r\n                    .singleOrNull()?.value\r\n            }.getOrNull()?.let { constructedThisInstance -\u003e\r\n                assertInstanceOf(LocalDateTime::class.java, constructedThisInstance)\r\n                seenLocalDateTime = true\r\n                Control.STOP\r\n            } ?: Control.CONTINUE\r\n            BaseFeedback(Trie.emptyNode(), control)\r\n        }\r\n    }\r\n    assertTrue(seenLocalDateTime) { \"No value was generated for type LocalDateTime\" }\r\n}\r\n```\r\n\r\n**Expected behavior**\r\n\r\nTest passes.\r\n\r\n**Actual behavior**\r\n\r\nTest fails.\r\n\r\n**Visual proofs (screenshots, logs, images)**\r\n\r\n~~~\r\nNo value was generated for type LocalDateTime ==\u003e expected: \u003ctrue\u003e but was: \u003cfalse\u003e\r\n~~~","author":{"url":"https://github.com/IlyaMuravjov","@type":"Person","name":"IlyaMuravjov"},"datePublished":"2023-07-24T08:17:13.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":1},"url":"https://github.com/2437/UTBotJava/issues/2437"}