Code review. Fixes #2625

Author: bnasslahsen

springdoc-openapi-tests/springdoc-openapi-hateoas-tests/src/test/java/test/org/springdoc/api/app10/SpringDocApp10NotSpecifiedTest.java

@@ -22,8 +22,23 @@
 
 package test.org.springdoc.api.app10;
 
+import java.lang.reflect.Field;
+import java.util.HashMap;
+import java.util.Iterator;
+import java.util.Map;
+import java.util.Map.Entry;
+
+import com.fasterxml.jackson.databind.ObjectMapper;
+import com.fasterxml.jackson.databind.introspect.SimpleMixInResolver;
+import com.fasterxml.jackson.databind.type.ClassKey;
+import org.apache.commons.lang3.reflect.FieldUtils;
+import org.junit.jupiter.api.AfterEach;
+import org.junit.jupiter.api.BeforeEach;
 import org.junit.jupiter.api.Test;
+import org.springdoc.core.providers.ObjectMapperProvider;
 import org.springdoc.core.utils.Constants;
+
+import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.boot.SpringBootConfiguration;
 import org.springframework.boot.autoconfigure.SpringBootApplication;
 import org.springframework.data.web.config.EnableSpringDataWebSupport;
@@ -35,6 +50,11 @@
 
 public class SpringDocApp10NotSpecifiedTest extends AbstractSpringDocTest {
 
+	private final Map<ClassKey, Class<?>> springMixins = new HashMap<>();
+
+	@Autowired
+	ObjectMapperProvider objectMapperProvider;
+	
 	@Override
 	@Test
 	public void testApp() throws Exception {
@@ -49,4 +69,29 @@ public static class SpringDocTestApp {
 
 	}
 
+	@BeforeEach
+	void init() throws IllegalAccessException {
+		Field convertersField2 = FieldUtils.getDeclaredField(ObjectMapper.class, "_mixIns", true);
+		SimpleMixInResolver _mixIns = (SimpleMixInResolver) convertersField2.get(objectMapperProvider.jsonMapper());
+		Field convertersField3 = FieldUtils.getDeclaredField(SimpleMixInResolver.class, "_localMixIns", true);
+		Map<ClassKey, Class<?>> _localMixIns = (Map<ClassKey, Class<?>>) convertersField3.get(_mixIns);
+		Iterator<Entry<ClassKey, Class<?>>> it = _localMixIns.entrySet().iterator();
+		while (it.hasNext()) {
+			Entry<ClassKey, Class<?>> entry = it.next();
+			if (entry.getKey().toString().startsWith("org.springframework")) {
+				springMixins.put(entry.getKey(), entry.getValue());
+				it.remove();
+			}
+		}
+
+	}
+
+	@AfterEach
+	void clean() throws IllegalAccessException {
+		Field convertersField2 = FieldUtils.getDeclaredField(ObjectMapper.class, "_mixIns", true);
+		SimpleMixInResolver _mixIns = (SimpleMixInResolver) convertersField2.get(objectMapperProvider.jsonMapper());
+		Field convertersField3 = FieldUtils.getDeclaredField(SimpleMixInResolver.class, "_localMixIns", true);
+		Map<ClassKey, Class<?>> _localMixIns = (Map<ClassKey, Class<?>>) convertersField3.get(_mixIns);
+		_localMixIns.putAll(springMixins);
+	}
 }