Upgrading from 3.1.0 to a newer version

[Tomás Ortí]

Hello!

An application is running with MyBatis 3.1.0.

I need to investigate if it is possible to upgrade MyBatis to a newer version.

And how much effort and time would it take.

The application was conceived using mybatis generator.

So, it is composed by auto-generated XML and Java files. 

Although it also evolved using custom made Mapped statements.

So, it also has custom XML files and POJOs.

I would appreciate some feedback about which are the main points a migration like this could come across.

Checking Github repository showed that many things have changed since version 3.1.0.

So it would be good to know if a newer version is backward compatible and any other issues that could arise.

Thanks you very much!!    

[Guy Rouillier]

Give it a try.  Been several years since 3.1.0, so I truthfully don't remember any migration.  The 3.x series should be backwards compatible.  Post back with any specific issues you encounter.

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Guy Rouillier

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[Jeremy Landis]

3.5.x requires jdk 8.

3.4.x or somewhere around there was a bit more strict so if really bad code to the mappers that used to just work, it will not any longer.

For most it is rather drop in place.

[Tomás Ortí]

Ok, compilation with 3.5.6 reported no errors.
Though when starting the app, the first error to appear is this one:

### Error building SqlSession.

### The error may exist in com/ericsson/m2m/common/utils/persistence/impl/mybatis/custom/xml/CustomerOptimalMapper.xml

### The error occurred while processing mapper_resultMap[CustomerMatch]

### Cause: org.apache.ibatis.builder.BuilderException: Error parsing SQL Mapper Configuration. Cause: org.apache.ibatis.builder.BuilderException: Error parsing Mapper XML. The XML location is 'com/ericsson/m2m/common/utils/persistence/impl/mybatis/custom/xml/CustomerOptimalMapper.xml'. Cause: java.lang.IllegalStateException: Mapping is missing column attribute for property id

So it seems it is failing when XMLMapperBuilder is parsing the XML file.
Something is wrong (needs to be fixed) in <resultMap id="CustomerMatch" 

Some help would be appreciated.

Best Regards.

[Tomás Ortí]

It is complaining of id property on:

<resultMap id="CustomerMatch" type="com.ericsson.m2m.common.utils.persistence.impl.mybatis.custom.model.CustomerMatch">
<id property="id" jdbcType="VARCHAR" />
<result property="value0" jdbcType="VARCHAR" column="value0" />

Due to this code:

Adding column="id"

<id property="id" jdbcType="VARCHAR" column="id" />

seeems to solve the error.