NullPointException in ResultSetHandler when java type className is null. #699
Description
MyBatis version
3.1.1
Database vendor and version
Kylin jdbc 1.5.1
Test case or example project
@SELECT("select a,b from table limit 1")
Map<String, Object> selectOne();Steps to reproduce
Expected result
selectOne will return a map contain result select
Actual result
Error:
NullPointException when handling resultSet, root cause is Class.forName(null)
in FastResultSetHandler.java (DefaultResultSetHandler named in later verison)
the getTypeHandler method will throw NPE when classNames.get() return null.However, mybatis will handler the situation when can not load class(from classNames.get()).So it is ok when classNames.get() return null or can not load the class, we can ignore null.And we I ignore null,mybatis work well and return the result what I expected.
(I can not upload the image, so I paste the code)
In mybatis 3.1.1 which will throw NPE
final Class javaType = resolveClass((String)classNames.get(index)); //classNames.get() will return null in kylin-jdbc 1.5.1
if(javaType != null && jdbcType != null) {`
handler = typeHandlerRegistry.getTypeHandler(javaType, jdbcType);
} else if(javaType != null) {
handler = typeHandlerRegistry.getTypeHandler(javaType);
} else if(jdbcType != null) { //notice:mybatis will get type handler by jdbcType if javaType is null
handler = typeHandlerRegistry.getTypeHandler(jdbcType);
}so if catch the NPE,maybe it will ok,and result is what I expected, following is code
final Class javaType = classNames.get(index) == null ? null : resolveClass((String)classNames.get(index));