Revised default type handler registration

If a handler is registered against null JDBC type, it is the default handler for the Java type.
Users can override the default handler (e.g. `register(boolean.class, null, new YNBooleanTypeHandler())` or register a custom handler for a specific Java-JDBC type combination (e.g. `register(boolean.class, JdbcType.CHAR, new YNBooleanTypeHandler())`).

Type handlers in the `jdbcTypeHandlerMap` are used when Java type is unknown or as a last resort when no matching handler is found for the target Java type.

Author: harawata

src/main/java/org/apache/ibatis/type/BigDecimalTypeHandler.java

@@ -1,5 +1,5 @@
 /*
- *    Copyright 2009-2023 the original author or authors.
+ *    Copyright 2009-2025 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.
@@ -25,6 +25,7 @@
  * @author Clinton Begin
  */
 public class BigDecimalTypeHandler extends BaseTypeHandler<BigDecimal> {
+  public static final BigDecimalTypeHandler INSTANCE = new BigDecimalTypeHandler();
 
   @Override
   public void setNonNullParameter(PreparedStatement ps, int i, BigDecimal parameter, JdbcType jdbcType)

src/main/java/org/apache/ibatis/type/BlobTypeHandler.java

@@ -1,5 +1,5 @@
 /*
- *    Copyright 2009-2024 the original author or authors.
+ *    Copyright 2009-2025 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.
@@ -26,6 +26,7 @@
  * @author Clinton Begin
  */
 public class BlobTypeHandler extends BaseTypeHandler<byte[]> {
+  public static final BlobTypeHandler INSTANCE = new BlobTypeHandler();
 
   @Override
   public void setNonNullParameter(PreparedStatement ps, int i, byte[] parameter, JdbcType jdbcType)

src/main/java/org/apache/ibatis/type/BooleanTypeHandler.java

@@ -1,5 +1,5 @@
 /*
- *    Copyright 2009-2023 the original author or authors.
+ *    Copyright 2009-2025 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.
@@ -24,6 +24,7 @@
  * @author Clinton Begin
  */
 public class BooleanTypeHandler extends BaseTypeHandler<Boolean> {
+  public static final BooleanTypeHandler INSTANCE = new BooleanTypeHandler();
 
   @Override
   public void setNonNullParameter(PreparedStatement ps, int i, Boolean parameter, JdbcType jdbcType)

src/main/java/org/apache/ibatis/type/ByteArrayTypeHandler.java

@@ -1,5 +1,5 @@
 /*
- *    Copyright 2009-2023 the original author or authors.
+ *    Copyright 2009-2025 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.
@@ -24,6 +24,7 @@
  * @author Clinton Begin
  */
 public class ByteArrayTypeHandler extends BaseTypeHandler<byte[]> {
+  public static final ByteArrayTypeHandler INSTANCE = new ByteArrayTypeHandler();
 
   @Override
   public void setNonNullParameter(PreparedStatement ps, int i, byte[] parameter, JdbcType jdbcType)

src/main/java/org/apache/ibatis/type/ByteTypeHandler.java

@@ -1,5 +1,5 @@
 /*
- *    Copyright 2009-2023 the original author or authors.
+ *    Copyright 2009-2025 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.
@@ -24,6 +24,7 @@
  * @author Clinton Begin
  */
 public class ByteTypeHandler extends BaseTypeHandler<Byte> {
+  public static final ByteTypeHandler INSTANCE = new ByteTypeHandler();
 
   @Override
   public void setNonNullParameter(PreparedStatement ps, int i, Byte parameter, JdbcType jdbcType) throws SQLException {

src/main/java/org/apache/ibatis/type/ClobTypeHandler.java

@@ -1,5 +1,5 @@
 /*
- *    Copyright 2009-2023 the original author or authors.
+ *    Copyright 2009-2025 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.
@@ -26,6 +26,7 @@
  * @author Clinton Begin
  */
 public class ClobTypeHandler extends BaseTypeHandler<String> {
+  public static final ClobTypeHandler INSTANCE = new ClobTypeHandler();
 
   @Override
   public void setNonNullParameter(PreparedStatement ps, int i, String parameter, JdbcType jdbcType)

src/main/java/org/apache/ibatis/type/DateOnlyTypeHandler.java

@@ -1,5 +1,5 @@
 /*
- *    Copyright 2009-2024 the original author or authors.
+ *    Copyright 2009-2025 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.
@@ -25,6 +25,7 @@
  * @author Clinton Begin
  */
 public class DateOnlyTypeHandler extends BaseTypeHandler<Date> {
+  public static final DateOnlyTypeHandler INSTANCE = new DateOnlyTypeHandler();
 
   @Override
   public void setNonNullParameter(PreparedStatement ps, int i, Date parameter, JdbcType jdbcType) throws SQLException {

src/main/java/org/apache/ibatis/type/DateTypeHandler.java

@@ -1,5 +1,5 @@
 /*
- *    Copyright 2009-2024 the original author or authors.
+ *    Copyright 2009-2025 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.
@@ -26,6 +26,7 @@
  * @author Clinton Begin
  */
 public class DateTypeHandler extends BaseTypeHandler<Date> {
+  public static final DateTypeHandler INSTANCE = new DateTypeHandler();
 
   @Override
   public void setNonNullParameter(PreparedStatement ps, int i, Date parameter, JdbcType jdbcType) throws SQLException {

src/main/java/org/apache/ibatis/type/DoubleTypeHandler.java

@@ -1,5 +1,5 @@
 /*
- *    Copyright 2009-2023 the original author or authors.
+ *    Copyright 2009-2025 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.
@@ -24,6 +24,7 @@
  * @author Clinton Begin
  */
 public class DoubleTypeHandler extends BaseTypeHandler<Double> {
+  public static final DoubleTypeHandler INSTANCE = new DoubleTypeHandler();
 
   @Override
   public void setNonNullParameter(PreparedStatement ps, int i, Double parameter, JdbcType jdbcType)

src/main/java/org/apache/ibatis/type/FloatTypeHandler.java

@@ -1,5 +1,5 @@
 /*
- *    Copyright 2009-2023 the original author or authors.
+ *    Copyright 2009-2025 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.
@@ -24,6 +24,7 @@
  * @author Clinton Begin
  */
 public class FloatTypeHandler extends BaseTypeHandler<Float> {
+  public static final FloatTypeHandler INSTANCE = new FloatTypeHandler();
 
   @Override
   public void setNonNullParameter(PreparedStatement ps, int i, Float parameter, JdbcType jdbcType) throws SQLException {