Allow to scan TypeHandler that pass Class<?> to constructor

src/main/java/org/mybatis/spring/SqlSessionFactoryBean.java

@@ -186,7 +186,7 @@ public void setDatabaseIdProvider(DatabaseIdProvider databaseIdProvider) {
 
   /**
    * Gets the VFS.
-   * 
+   *
    * @return a specified VFS
    */
   public Class<? extends VFS> getVfs() {
@@ -195,7 +195,7 @@ public Class<? extends VFS> getVfs() {
 
   /**
    * Sets the VFS.
-   * 
+   *
    * @param vfs
    *          a VFS
    */
@@ -205,7 +205,7 @@ public void setVfs(Class<? extends VFS> vfs) {
 
   /**
    * Gets the Cache.
-   * 
+   *
    * @return a specified Cache
    */
   public Cache getCache() {
@@ -214,7 +214,7 @@ public Cache getCache() {
 
   /**
    * Sets the Cache.
-   * 
+   *
    * @param cache
    *          a Cache
    */
@@ -270,7 +270,7 @@ public void setTypeAliasesSuperType(Class<?> typeAliasesSuperType) {
    *
    * <p>
    * Since 2.0.1, allow to specify a wildcard such as {@code com.example.*.typehandler}.
-   * 
+   *
    * @since 1.0.1
    *
    * @param typeHandlersPackage
@@ -331,7 +331,7 @@ public void setConfigLocation(Resource configLocation) {
 
   /**
    * Set a customized MyBatis configuration.
-   * 
+   *
    * @param configuration
    *          MyBatis configuration
    * @since 1.3.0
@@ -535,7 +535,6 @@ protected SqlSessionFactory buildSqlSessionFactory() throws Exception {
     if (hasLength(this.typeHandlersPackage)) {
       scanClasses(this.typeHandlersPackage, TypeHandler.class).stream().filter(clazz -> !clazz.isAnonymousClass())
           .filter(clazz -> !clazz.isInterface()).filter(clazz -> !Modifier.isAbstract(clazz.getModifiers()))
-          .filter(clazz -> ClassUtils.getConstructorIfAvailable(clazz) != null)
           .forEach(targetConfiguration.getTypeHandlerRegistry()::register);
     }
 

src/test/java/org/mybatis/core/jdk/type/AtomicNumberTypeHandler.java

@@ -0,0 +1,54 @@
+/**
+ * Copyright 2010-2019 the original author or 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 org.mybatis.core.jdk.type;
+
+import java.sql.CallableStatement;
+import java.sql.PreparedStatement;
+import java.sql.ResultSet;
+import java.sql.SQLException;
+import java.util.concurrent.atomic.AtomicInteger;
+import java.util.concurrent.atomic.AtomicLong;
+
+import org.apache.ibatis.type.JdbcType;
+import org.apache.ibatis.type.MappedTypes;
+import org.apache.ibatis.type.TypeHandler;
+
+@MappedTypes({ AtomicInteger.class, AtomicLong.class })
+public class AtomicNumberTypeHandler implements TypeHandler<Number> {
+
+  public AtomicNumberTypeHandler(Class<?> type) {
+  }
+
+  @Override
+  public void setParameter(PreparedStatement ps, int i, Number parameter, JdbcType jdbcType) throws SQLException {
+  }
+
+  @Override
+  public Number getResult(ResultSet rs, String columnName) throws SQLException {
+    return null;
+  }
+
+  @Override
+  public Number getResult(CallableStatement cs, int columnIndex) throws SQLException {
+    return null;
+  }
+
+  @Override
+  public Number getResult(ResultSet rs, int columnIndex) throws SQLException {
+    return null;
+  }
+
+}

src/test/java/org/mybatis/spring/SqlSessionFactoryBeanTest.java

@@ -22,6 +22,8 @@
 import java.math.BigInteger;
 import java.util.Properties;
 import java.util.UUID;
+import java.util.concurrent.atomic.AtomicInteger;
+import java.util.concurrent.atomic.AtomicLong;
 
 import org.apache.ibatis.cache.impl.PerpetualCache;
 import org.apache.ibatis.io.JBoss6VFS;
@@ -43,6 +45,7 @@
 import org.apache.ibatis.type.TypeHandler;
 import org.apache.ibatis.type.TypeHandlerRegistry;
 import org.junit.jupiter.api.Test;
+import org.mybatis.core.jdk.type.AtomicNumberTypeHandler;
 import org.mybatis.spring.transaction.SpringManagedTransactionFactory;
 import org.mybatis.spring.type.DummyTypeAlias;
 import org.mybatis.spring.type.DummyTypeHandler;
@@ -400,12 +403,14 @@ void testSearchATypeAliasPackageWithSamePackage() throws Exception {
   @Test
   void testSearchATypeHandlerPackage() throws Exception {
     setupFactoryBean();
-    factoryBean.setTypeHandlersPackage("org.**.type");
+    factoryBean.setTypeHandlersPackage("org.mybatis.**.type");
 
     TypeHandlerRegistry typeHandlerRegistry = factoryBean.getObject().getConfiguration().getTypeHandlerRegistry();
     assertThat(typeHandlerRegistry.hasTypeHandler(BigInteger.class)).isTrue();
     assertThat(typeHandlerRegistry.hasTypeHandler(BigDecimal.class)).isTrue();
     assertThat(typeHandlerRegistry.getTypeHandler(UUID.class)).isInstanceOf(TypeHandlerFactory.InnerTypeHandler.class);
+    assertThat(typeHandlerRegistry.getTypeHandler(AtomicInteger.class)).isInstanceOf(AtomicNumberTypeHandler.class);
+    assertThat(typeHandlerRegistry.getTypeHandler(AtomicLong.class)).isInstanceOf(AtomicNumberTypeHandler.class);
   }
 
   @Test