chore: Bump kotlinx-schema to 0.4.3 and update changelog + test (#266)

- Bump kotlinx-schema to 0.4.3 and update changelog
- test: Add test for JSON schema generation from nullable defaults
(#263)

### Pre-Submission Checklist

- [x] **Self-reviewed** my own code
- [x] **Tests added/updated** and passing locally
- [x] **Documentation updated** (if needed: README, code comments, etc.)
- [ ] **Focused PR**: Single concern, no unrelated changes or "drive-by"
fixes
- [ ] **Breaking changes documented** (if applicable)
- [x] **No debug code**: Removed commented-out code and debug statements

Author: kpavlov

CHANGELOG.md

@@ -1,3 +1,19 @@
+## 0.4.3
+> Published 2026-03-17
+
+### Fixed
+- **Java record class support**: reflection schema generator now correctly introspects Java `record` types (#263)
+- **Nullable required constructor parameters**: default value extraction no longer silently skips nullable required
+  parameters when building mock constructor arguments, restoring correct defaults detection for classes with
+  patterns such as `data class Foo(val tag: String? = "abc", val count: Int? = 5)` (#263)
+- **Private constructor filtering**: fallback constructor lookup now skips `private` constructors, preventing
+  accidental invocation of synthetic or internal-only constructors (#263)
+
+### Dependencies
+- Bump `kotest` from 6.1.6 to 6.1.7
+
+---
+
 ## 0.4.2
 > Published 2026-03-13
 

examples/gradle-google-ksp/gradle.properties

@@ -12,4 +12,4 @@ name = gradle-google-ksp-example
 group=org.jetbrains.kotlinx.examples
 version=1.0-SNAPSHOT
 
-kotlinxSchemaVersion=0.4.1
+kotlinxSchemaVersion=0.4.3

examples/maven-ksp/pom.xml

@@ -16,7 +16,7 @@
         <kotlin.version>2.3.10</kotlin.version>
         <maven.compiler.release>25</maven.compiler.release>
         <ksp.plugin.version>0.4.0</ksp.plugin.version>
-        <kotlinx-schema.version>0.4.2</kotlinx-schema.version>
+        <kotlinx-schema.version>0.4.3</kotlinx-schema.version>
         <kotest.version>6.1.7</kotest.version>
         <kotlinx-serialization.version>1.10.0</kotlinx-serialization.version>
         <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>

gradle.properties

@@ -20,7 +20,7 @@ ksp.useKSP2=true
 detekt.use.worker.api = true
 
 group=org.jetbrains.kotlinx
-version=0.4.3-SNAPSHOT
+version=0.4.4-SNAPSHOT
 
 versionSuffix=SNAPSHOT
 

kotlinx-schema-generator-json/src/jvmTest/kotlin/kotlinx/schema/generator/json/JavaClassJsonSchemaGeneratorTest.kt

@@ -149,4 +149,39 @@ class JavaClassJsonSchemaGeneratorTest {
 
         actualSchema shouldEqualJson expectedSchema
     }
+
+    @Test
+    fun `Should generate JsonSchema from nullable defaults`() {
+        data class Foo(
+            val tag: String? = "abc",
+            val count: Int? = 5,
+        )
+        // External Java class
+        val actualSchema = generator.generateSchemaString(Foo::class)
+        actualSchema shouldEqualJson
+            $$"""
+            {
+             "$schema": "https://json-schema.org/draft/2020-12/schema",
+              "$id": "Foo",
+              "type": "object",
+              "properties": {
+                "tag": {
+                  "type": [
+                    "string",
+                    "null"
+                  ],
+                  "default": "abc"
+                },
+                "count": {
+                  "type": [
+                    "integer",
+                    "null"
+                  ],
+                  "default": 5
+                }
+              },
+              "additionalProperties": false
+            }
+            """.trimIndent()
+    }
 }