cannot find type handler for enum when enum value has methods

[zhzhsx]

MyBatis version

3.5.0

Database vendor and version

Independent of databases and versions. For an exapmle, hsqldb in mybatis tests.

Test case or example project

https://github.com/zhzhsx/mybatis-3/tree/master/src/test/java/org/apache/ibatis/submitted/enum_with_method

Steps to reproduce

Run the test: EnumWithMethodTest#shouldInsertAUser.

Expected result

A user should be inserted into the database successfully.

Actual result

The test fails.

Notes on conditions to reproduce the issue

• The enum value (Currency enum in the test) has methods
• No 'parameterType' attribute is provided in corresponding insert mapper

[kazuki43zoo]

@zhzhsx

Thanks for your reporting! I think this is bug.
MyBatis will try to resolve automatically using actual object type at request time when parameterType attribute is omit on XML element. In this case(enum that implements any method), object type become an anonymous class (such as z.yz.Currency$1). Therefore MyBatis does not use the EnumTypeHandler because the anonymous class return false on Class#isEnum().

[kazuki43zoo]

Workaround is adding the parameterType attribute in XML element(insert/update/delete/select). or specify typehandler in bind parameter expression(e.g. #{currency,typeHandler=...EnumTypeHandler}).

[kazuki43zoo]

@zhzhsx

It should be fixed in the latest 3.5.1-SNAPSHOT.
Thanks you!