Remove old StrictNullChecks

pom.xml

@@ -254,6 +254,12 @@
                             <!-- removed -->
                             <exclude>com.fasterxml.jackson.module.kotlin.MissingKotlinParameterException</exclude>
                             <!-- internal -->
+                            <exclude>
+                                com.fasterxml.jackson.module.kotlin.KotlinInstantiators#KotlinInstantiators(com.fasterxml.jackson.module.kotlin.ReflectionCache,boolean,boolean,boolean,boolean)
+                            </exclude>
+                            <exclude>
+                                com.fasterxml.jackson.module.kotlin.KotlinValueInstantiator#KotlinValueInstantiator(com.fasterxml.jackson.databind.deser.std.StdValueInstantiator,com.fasterxml.jackson.module.kotlin.ReflectionCache,boolean,boolean,boolean,boolean)
+                            </exclude>
                         </excludes>
                     </parameter>
                 </configuration>

release-notes/CREDITS-2.x

@@ -18,6 +18,7 @@ Contributors:
 # 2.21.0 (not yet released)
 
 WrongWrong (@k163377)
+* #1042: Remove old StrictNullChecks
 * #1041: Remove MissingKotlinParameterException
 * #1039: Update settings for 2.20
 

release-notes/VERSION-2.x

@@ -18,6 +18,8 @@ Co-maintainers:
 
 2.21.0 (not yet released)
 
+#1042: The old StrictNullChecks backend has been removed.
+  This improves the throughput of deserialization slightly.
 #1041: The deprecated MissingKotlinParameterException has been removed.
 #1039: Kotlin has been upgraded to 2.1.x.
 

src/main/kotlin/com/fasterxml/jackson/module/kotlin/KotlinFeature.kt

@@ -40,13 +40,12 @@ enum class KotlinFeature(internal val enabledByDefault: Boolean) {
      *
      * With this disabled, the default, collections which are typed to disallow null members (e.g. `List<String>`)
      * may contain null values after deserialization.
-     * Enabling it protects against this but has significant performance impact.
+     * Enabling this will cause an [InvalidNullException] to be thrown if null is entered.
+     *
+     * Internally, it will be the same as if [JsonSetter] (contentNulls = FAIL) had been granted.
+     *
+     * Benchmarks show that it can check for illegal nulls with throughput nearly identical to the default (see [jackson-module-kotlin#719]).
      */
-    @Deprecated(
-        level = DeprecationLevel.ERROR,
-        message = "This option will be migrated to the new backend in 2.21.",
-        replaceWith = ReplaceWith("NewStrictNullChecks")
-    )
     StrictNullChecks(enabledByDefault = false),
 
     /**
@@ -80,15 +79,15 @@ enum class KotlinFeature(internal val enabledByDefault: Boolean) {
      * Internally, it will be the same as if [JsonSetter] (contentNulls = FAIL) had been granted.
      * Benchmarks show that it can check for illegal nulls with throughput nearly identical to the default (see [jackson-module-kotlin#719]).
      *
-     * Note that in the new backend, the exception thrown has changed from [MissingKotlinParameterException] to [InvalidNullException].
-     * The message will be changed accordingly.
-     * Since 2.19, the base class of [MissingKotlinParameterException] has also been changed to [InvalidNullException],
-     * so be careful when catching it.
-     *
      * This is a temporary option for a phased backend migration,
      * which will eventually be merged into [StrictNullChecks].
      * Also, specifying both this and [StrictNullChecks] is not permitted.
      */
+    @Deprecated(
+        level = DeprecationLevel.WARNING,
+        message = "This option will be merged into StrictNullChecks in 2.23.",
+        replaceWith = ReplaceWith("StrictNullChecks")
+    )
     NewStrictNullChecks(enabledByDefault = false);
 
     internal val bitSet: BitSet = (1 shl ordinal).toBitSet()

src/main/kotlin/com/fasterxml/jackson/module/kotlin/KotlinModule.kt

@@ -43,11 +43,10 @@ class KotlinModule private constructor(
     val nullToEmptyMap: Boolean = NullToEmptyMap.enabledByDefault,
     val nullIsSameAsDefault: Boolean = NullIsSameAsDefault.enabledByDefault,
     val singletonSupport: Boolean = SingletonSupport.enabledByDefault,
-    @Suppress("DEPRECATION_ERROR")
     strictNullChecks: Boolean = StrictNullChecks.enabledByDefault,
     val kotlinPropertyNameAsImplicitName: Boolean = KotlinPropertyNameAsImplicitName.enabledByDefault,
     val useJavaDurationConversion: Boolean = UseJavaDurationConversion.enabledByDefault,
-    private val newStrictNullChecks: Boolean = NewStrictNullChecks.enabledByDefault,
+    newStrictNullChecks: Boolean = NewStrictNullChecks.enabledByDefault,
 ) : SimpleModule(KotlinModule::class.java.name, PackageVersion.VERSION) {
     /*
      * Prior to 2.18, an older Enum called SingletonSupport was used to manage feature.
@@ -67,8 +66,6 @@ class KotlinModule private constructor(
     )
     val enabledSingletonSupport: Boolean get() = singletonSupport
 
-    private val oldStrictNullChecks: Boolean = strictNullChecks
-
     // To reduce the amount of destructive changes, no properties will be added to the public.
     val strictNullChecks: Boolean = if (strictNullChecks) {
         if (newStrictNullChecks) {
@@ -113,7 +110,7 @@ class KotlinModule private constructor(
 
         val cache = ReflectionCache(reflectionCacheSize)
 
-        context.addValueInstantiators(KotlinInstantiators(cache, nullToEmptyCollection, nullToEmptyMap, nullIsSameAsDefault, oldStrictNullChecks))
+        context.addValueInstantiators(KotlinInstantiators(cache, nullToEmptyCollection, nullToEmptyMap, nullIsSameAsDefault))
 
         if (singletonSupport) {
             context.addBeanDeserializerModifier(KotlinBeanDeserializerModifier)
@@ -128,7 +125,7 @@ class KotlinModule private constructor(
             useJavaDurationConversion
         ))
         context.appendAnnotationIntrospector(
-            KotlinNamesAnnotationIntrospector(cache, newStrictNullChecks, kotlinPropertyNameAsImplicitName)
+            KotlinNamesAnnotationIntrospector(cache, strictNullChecks, kotlinPropertyNameAsImplicitName)
         )
 
         context.addDeserializers(KotlinDeserializers(cache, useJavaDurationConversion))

src/main/kotlin/com/fasterxml/jackson/module/kotlin/KotlinValueInstantiator.kt

@@ -22,16 +22,13 @@ internal class KotlinValueInstantiator(
     private val cache: ReflectionCache,
     private val nullToEmptyCollection: Boolean,
     private val nullToEmptyMap: Boolean,
-    private val nullIsSameAsDefault: Boolean,
-    private val strictNullChecks: Boolean
+    private val nullIsSameAsDefault: Boolean
 ) : StdValueInstantiator(src) {
     private fun JavaType.requireEmptyValue() =
         (nullToEmptyCollection && this.isCollectionLikeType) || (nullToEmptyMap && this.isMapLikeType)
 
     private fun KType.isGenericTypeVar() = javaType is TypeVariable<*>
 
-    private fun List<KTypeProjection>.markedNonNullAt(index: Int) = getOrNull(index)?.type?.isMarkedNullable == false
-
     // If the argument is a value class that wraps nullable and non-null,
     // and the input is explicit null, the value class is instantiated with null as input.
     private fun requireValueClassSpecialNullValue(
@@ -104,35 +101,6 @@ internal class KotlinValueInstantiator(
                         ).wrapWithPath(this.valueClass, pname)
                     }
                 }
-            } else if (strictNullChecks) {
-                val arguments = paramType.arguments
-
-                // To make the behavior the same as deserialization of each element using NullsFailProvider,
-                // first wrapWithPath with paramVal and key.
-                val ex = when {
-                    propType.isCollectionLikeType && arguments.markedNonNullAt(0) -> {
-                        (paramVal as Collection<*>).indexOf(null).takeIf { it >= 0 }?.let {
-                            InvalidNullException.from(ctxt, jsonProp.fullName, jsonProp.type)
-                                .wrapWithPath(paramVal, it)
-                        }
-                    }
-                    propType.isMapLikeType && arguments.markedNonNullAt(1) -> {
-                        (paramVal as Map<*, *>).entries.find { (_, v) -> v == null }?.let { (k, _) ->
-                            InvalidNullException.from(ctxt, jsonProp.fullName, jsonProp.type)
-                                .wrapWithPath(paramVal, k.toString())
-                        }
-                    }
-                    propType.isArrayType && arguments.markedNonNullAt(0) -> {
-                        (paramVal as Array<*>).indexOf(null).takeIf { it >= 0 }?.let {
-                            InvalidNullException.from(ctxt, jsonProp.fullName, jsonProp.type)
-                                .wrapWithPath(paramVal, it)
-                        }
-                    }
-                    else -> null
-                }
-
-                // Then, wrapWithPath with this property.
-                ex?.let { throw it.wrapWithPath(this.valueClass, jsonProp.name) }
             }
 
             bucket[paramDef] = paramVal
@@ -151,7 +119,6 @@ internal class KotlinInstantiators(
     private val nullToEmptyCollection: Boolean,
     private val nullToEmptyMap: Boolean,
     private val nullIsSameAsDefault: Boolean,
-    private val strictNullChecks: Boolean
 ) : ValueInstantiators {
     override fun findValueInstantiator(
         deserConfig: DeserializationConfig,
@@ -165,8 +132,7 @@ internal class KotlinInstantiators(
                     cache,
                     nullToEmptyCollection,
                     nullToEmptyMap,
-                    nullIsSameAsDefault,
-                    strictNullChecks
+                    nullIsSameAsDefault
                 )
             } else {
                 // TODO: return defaultInstantiator and let default method parameters and nullability go unused?  or die with exception:

src/test/kotlin/com/fasterxml/jackson/module/kotlin/KotlinInstantiatorsTest.kt

@@ -11,8 +11,7 @@ class KotlinInstantiatorsTest {
         ReflectionCache(10),
         nullToEmptyCollection = false,
         nullToEmptyMap = false,
-        nullIsSameAsDefault = false,
-        strictNullChecks = false
+        nullIsSameAsDefault = false
     )
 
     @Test

src/test/kotlin/com/fasterxml/jackson/module/kotlin/kogeraIntegration/deser/StrictNullChecksTest.kt

@@ -16,7 +16,7 @@ class StrictNullChecksTest {
     val mapper: ObjectMapper = ObjectMapper()
         .registerModule(
             KotlinModule.Builder()
-                .enable(KotlinFeature.NewStrictNullChecks)
+                .enable(KotlinFeature.StrictNullChecks)
                 .build()
         )
 

src/test/kotlin/com/fasterxml/jackson/module/kotlin/test/StrictNullChecksTest.kt

@@ -2,7 +2,7 @@ package com.fasterxml.jackson.module.kotlin.test
 
 import com.fasterxml.jackson.databind.ObjectMapper
 import com.fasterxml.jackson.databind.exc.InvalidNullException
-import com.fasterxml.jackson.module.kotlin.KotlinFeature.NewStrictNullChecks
+import com.fasterxml.jackson.module.kotlin.KotlinFeature
 import com.fasterxml.jackson.module.kotlin.kotlinModule
 import com.fasterxml.jackson.module.kotlin.readValue
 import org.junit.jupiter.api.Assertions.assertArrayEquals
@@ -13,7 +13,7 @@ import org.junit.jupiter.api.assertThrows
 import kotlin.test.assertNull
 
 class StrictNullChecksTest {
-    private val mapper = ObjectMapper().registerModule(kotlinModule { enable(NewStrictNullChecks) })
+    private val mapper = ObjectMapper().registerModule(kotlinModule { enable(KotlinFeature.StrictNullChecks) })
 
     /** collection tests */
 

src/test/kotlin/com/fasterxml/jackson/module/kotlin/test/github/GitHub757.kt

@@ -11,7 +11,7 @@ class GitHub757 {
     @Test
     fun test() {
         val kotlinModule = KotlinModule.Builder()
-            .enable(KotlinFeature.NewStrictNullChecks)
+            .enable(KotlinFeature.StrictNullChecks)
             .build()
         val mapper = JsonMapper.builder()
             .addModule(kotlinModule)