sharding-jdbc 出现 java.sql.SQLFeatureNotSupportedException: getObject with type 异常处理

项目环境：

1. sharding-jdbc  4.1.1
2. mybatis-plus   3.4.2
3. mybatis           3.5.6

问题：
LocalDateTime.class属性的对象orm框架无法映射

Caused by: java.sql.SQLFeatureNotSupportedException: getObject with type
	at org.apache.shardingsphere.shardingjdbc.jdbc.unsupported.AbstractUnsupportedOperationResultSet.getObject(AbstractUnsupportedOperationResultSet.java:221)
	at sun.reflect.GeneratedMethodAccessor191.invoke(Unknown Source)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:498)
	at org.apache.ibatis.logging.jdbc.ResultSetLogger.invoke(ResultSetLogger.java:69)
	at com.sun.proxy.$Proxy667.getObject(Unknown Source)
	at org.apache.ibatis.type.LocalDateTimeTypeHandler.getNullableResult(LocalDateTimeTypeHandler.java:38)
	at org.apache.ibatis.type.LocalDateTimeTypeHandler.getNullableResult(LocalDateTimeTypeHandler.java:28)
	at org.apache.ibatis.type.BaseTypeHandler.getResult(BaseTypeHandler.java:85)
	at org.apache.ibatis.executor.resultset.DefaultResultSetHandler.applyAutomaticMappings(DefaultResultSetHandler.java:560)
	at org.apache.ibatis.executor.resultset.DefaultResultSetHandler.getRowValue(DefaultResultSetHandler.java:402)
	at org.apache.ibatis.executor.resultset.DefaultResultSetHandler.handleRowValuesForSimpleResultMap(DefaultResultSetHandler.java:354)
	at org.apache.ibatis.executor.resultset.DefaultResultSetHandler.handleRowValues(DefaultResultSetHandler.java:328)
	at org.apache.ibatis.executor.resultset.DefaultResultSetHandler.handleResultSet(DefaultResultSetHandler.java:301)
	at org.apache.ibatis.executor.resultset.DefaultResultSetHandler.handleResultSets(DefaultResultSetHandler.java:194)
	at org.apache.ibatis.executor.statement.PreparedStatementHandler.query(PreparedStatementHandler.java:65)
	at org.apache.ibatis.executor.statement.RoutingStatementHandler.query(RoutingStatementHandler.java:79)
	at sun.reflect.GeneratedMethodAccessor183.invoke(Unknown Source)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:498)
	at org.apache.ibatis.plugin.Plugin.invoke(Plugin.java:63)
	at com.sun.proxy.$Proxy664.query(Unknown Source)
	at sun.reflect.GeneratedMethodAccessor183.invoke(Unknown Source)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:498)
	at org.apache.ibatis.plugin.Plugin.invoke(Plugin.java:63)
	at com.sun.proxy.$Proxy664.query(Unknown Source)
	at com.baomidou.mybatisplus.core.executor.MybatisSimpleExecutor.doQuery(MybatisSimpleExecutor.java:69)
	at org.apache.ibatis.executor.BaseExecutor.queryFromDatabase(BaseExecutor.java:325)
	at org.apache.ibatis.executor.BaseExecutor.query(BaseExecutor.java:156)
	at com.baomidou.mybatisplus.core.executor.MybatisCachingExecutor.query(MybatisCachingExecutor.java:165)
	at com.baomidou.mybatisplus.extension.plugins.MybatisPlusInterceptor.intercept(MybatisPlusInterceptor.java:81)
	at org.apache.ibatis.plugin.Plugin.invoke(Plugin.java:61)
	at com.sun.proxy.$Proxy663.query(Unknown Source)
	at com.github.pagehelper.PageInterceptor.intercept(PageInterceptor.java:111)
	at org.apache.ibatis.plugin.Plugin.invoke(Plugin.java:61)
	at com.sun.proxy.$Proxy663.query(Unknown Source)
	at org.apache.ibatis.session.defaults.DefaultSqlSession.selectList(DefaultSqlSession.java:147)
	at org.apache.ibatis.session.defaults.DefaultSqlSession.selectList(DefaultSqlSession.java:140)
	at sun.reflect.GeneratedMethodAccessor207.invoke(Unknown Source)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:498)
	at org.mybatis.spring.SqlSessionTemplate$SqlSessionInterceptor.invoke(SqlSessionTemplate.java:426)
	... 179 common frames omitted

原因：

异常由org.apache.shardingsphere.shardingjdbc.jdbc.unsupported.AbstractUnsupportedOperationResultSet抛出，往异常链查找
根源为org.apache.ibatis.type.LocalDateTimeTypeHandler.getNullableResult(LocalDateTimeTypeHandler.java:38)

处理方案：

• 参考百度搜索，mybatis配置自定义类型转换 type-handlers-package: com.xxx.包，无法解决问题，不希望降级版本.

• 处理方案一：个人根据java寻类的原理，在自己项目下创建mybatis相同包路径org.apache.ibatis.type的LocalDateTimeTypeHandler类.

• 

   

package org.apache.ibatis.type;

import com.github.pagehelper.util.StringUtil;

import java.sql.CallableStatement;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.time.LocalDateTime;
import java.time.format.DateTimeFormatter;


public class LocalDateTimeTypeHandler extends BaseTypeHandler {

    private final DateTimeFormatter dateTimeFormatter = DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss");

    @Override
    public void setNonNullParameter(PreparedStatement ps, int i, LocalDateTime parameter, JdbcType jdbcType)
            throws SQLException {
        if (parameter != null) {
            ps.setString(i, dateTimeFormatter.format(parameter));
        }
    }

    @Override
    public LocalDateTime getNullableResult(ResultSet rs, String columnName) throws SQLException {
        String target = rs.getString(columnName);
        if (StringUtil.isEmpty(target)) {
            return null;
        }
        return LocalDateTime.parse(target, dateTimeFormatter);
    }

    @Override
    public LocalDateTime getNullableResult(ResultSet rs, int columnIndex) throws SQLException {
        String target = rs.getString(columnIndex);
        if (StringUtil.isEmpty(target)) {
            return null;
        }
        return LocalDateTime.parse(target, dateTimeFormatter);
    }

    @Override
    public LocalDateTime getNullableResult(CallableStatement cs, int columnIndex) throws SQLException {
        String target = cs.getString(columnIndex);
        if (StringUtil.isEmpty(target)) {
            return null;
        }
        return LocalDateTime.parse(target, dateTimeFormatter);
    }
}

• 处理方案二：mybatis中的TypeHandlerRegistry注册自定义的LocalDateTimeHandler.

  import com.baomidou.mybatisplus.autoconfigure.MybatisPlusProperties;
  import com.baomidou.mybatisplus.core.MybatisConfiguration;
  import com.baomidou.mybatisplus.core.config.GlobalConfig;
  import com.baomidou.mybatisplus.core.toolkit.GlobalConfigUtils;
  import lombok.extern.slf4j.Slf4j;
  import org.mybatis.spring.annotation.MapperScan;
  import org.springframework.boot.autoconfigure.condition.ConditionalOnBean;
  import org.springframework.context.annotation.Configuration;
  
  import javax.sql.DataSource;
  import java.time.LocalDate;
  import java.time.LocalDateTime;
  import java.time.LocalTime;
  
  @Slf4j
  @Configuration
  @ConditionalOnBean(DataSource.class)
  @MapperScan("com.**.mapper")
  public class MybatisPlusConfiguration {
  
      public MybatisPlusConfiguration(MybatisPlusProperties mybatisPlusProperties) {
          MybatisConfiguration configuration = mybatisPlusProperties.getConfiguration();
          GlobalConfig globalConfig = mybatisPlusProperties.getGlobalConfig();
          GlobalConfigUtils.setGlobalConfig(configuration, globalConfig);
          configuration.getTypeHandlerRegistry().register(LocalDateTime.class, new LocalDateTimeTypeHandler());
          configuration.getTypeHandlerRegistry().register(LocalDate.class, new LocalDateTypeHandler());
          configuration.getTypeHandlerRegistry().register(LocalTime.class, new LocalTimeTypeHandler());
          GlobalConfigUtils.setGlobalConfig(configuration, globalConfig);
      }
  
  }
  

  补充 demo：
  https://github.com/ZTLiao/demo.git