fixes #9577

gradle/libs.versions.toml

@@ -41,6 +41,7 @@ micronaut-validation = "4.0.0-M9"
 micronaut-rxjava2 = "2.0.0-M6"
 micronaut-rxjava3 = "3.0.0-M6"
 micronaut-reactor = "3.0.0-M7"
+micronaut-serde = "2.1.0"
 neo4j-java-driver = "1.4.5"
 selenium = "4.9.1"
 slf4j = "2.0.7"
@@ -83,6 +84,7 @@ test-boms-micronaut-validation = { module = "io.micronaut.validation:micronaut-v
 test-boms-micronaut-rxjava2 = { module = "io.micronaut.rxjava2:micronaut-rxjava2-bom", version.ref = "micronaut-rxjava2" }
 test-boms-micronaut-rxjava3 = { module = "io.micronaut.rxjava3:micronaut-rxjava3-bom", version.ref = "micronaut-rxjava3" }
 test-boms-micronaut-reactor = { module = "io.micronaut.reactor:micronaut-reactor-bom", version.ref = "micronaut-reactor" }
+test-boms-micronaut-serialisation = { module = "io.micronaut.serde:micronaut-serde-bom", version.ref = "micronaut-serde" }
 
 boms-groovy = { module = "org.apache.groovy:groovy-bom", version.ref = "managed-groovy" }
 boms-kotlin = { module = "org.jetbrains.kotlin:kotlin-bom", version.ref = "managed-kotlin" }

json-core/build.gradle

@@ -13,6 +13,8 @@ dependencies {
     testImplementation project(":inject-java")
     testImplementation project(":inject-java-test")
     testImplementation project(":inject-groovy")
+    testImplementation platform(libs.test.boms.micronaut.serialisation)
+    testImplementation("io.micronaut.serde:micronaut-serde-jackson")
     if (!JavaVersion.current().isJava9Compatible()) {
         testImplementation files(org.gradle.internal.jvm.Jvm.current().toolsJar)
     }

json-core/src/main/java/io/micronaut/json/convert/JsonConverterRegistrar.java

@@ -27,6 +27,7 @@
 import io.micronaut.core.convert.MutableConversionService;
 import io.micronaut.core.convert.TypeConverter;
 import io.micronaut.core.convert.TypeConverterRegistrar;
+import io.micronaut.core.convert.exceptions.ConversionErrorException;
 import io.micronaut.core.convert.value.ConvertibleValues;
 import io.micronaut.core.naming.NameUtils;
 import io.micronaut.core.type.Argument;
@@ -176,6 +177,9 @@ protected TypeConverter<Map, Object> mapToObjectConverter() {
             }
             ArgumentBinder binder = this.beanPropertyBinder.get();
             ArgumentBinder.BindingResult result = binder.bind(conversionContext, correctKeys(map));
+            conversionContext.getLastError().ifPresent(error -> {
+                throw new ConversionErrorException(conversionContext.getArgument(), error);
+            });
             return result.getValue();
         };
     }

json-core/src/test/groovy/io/micronaut/json/convert/JsonConverterRegistrarSpec.groovy

@@ -0,0 +1,56 @@
+/*
+ * Copyright 2017-2019 original authors
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package io.micronaut.json.convert
+
+import io.micronaut.context.ApplicationContext
+import io.micronaut.core.annotation.Introspected
+import io.micronaut.core.convert.exceptions.ConversionErrorException
+import spock.lang.Specification
+
+class JsonConverterRegistrarSpec extends Specification {
+
+    void "throw ConversionErrorException when there is problem with serialisation"() {
+
+        given:
+        ApplicationContext ctx = ApplicationContext.run([
+                'micronaut.codec.json.additional-types': ['text/javascript', 'text/json']
+        ])
+
+        when:
+        JsonConverterRegistrar registrar = ctx.getBean(JsonConverterRegistrar)
+        def converter = registrar.mapToObjectConverter()
+        Map<String, Object> jsonMap = Map.of("firstName", "test", "constraint", Map.of("type", "age", "value", "18"))
+        converter.convert(jsonMap, OuterClass.class)
+
+        then:
+        def conversionError = thrown(ConversionErrorException.class)
+        conversionError.getMessage().contains("Ensure the class is annotated with io.micronaut.core.annotation.Introspected")
+    }
+
+    @Introspected
+    static class OuterClass {
+        String firstName
+        Constraint constraint
+    }
+
+    static record Constraint(Type type, String value) {
+        enum Type {
+            AGE,
+            SEX
+        }
+    }
+
+}