About map properties to java class in spring boot 2

I want to convert properties to map, see below

field2ZhNameMap.platform=平台

==>

private Map<String,String> field2ZhNameMap;

In Spring boot 1.5.6 start the app in tomcat it's OK, but use sprint boot 2.0.0.M7 start the app in tomcat I got below error

Caused by: org.springframework.boot.context.properties.bind.BindException: Failed to bind properties under '' to com.foo.bar.util.Field2ZhNameProperties
    at org.springframework.boot.context.properties.bind.Binder.handleBindError(Binder.java:227)


Caused by: java.lang.IllegalArgumentException: PropertyName must not be empty
    at org.springframework.util.Assert.hasLength(Assert.java:233)
    at org.springframework.boot.origin.PropertySourceOrigin.<init>(PropertySourceOrigin.java:41)

After debuging source code I found start the app in tomcat it has a JndiPropertySource which caused above problem. So I have to explicitly disable JndiPropertySource by specify spring.jndi.ignore=true in a spring.properties to solve this problem.

In addition I found these classes like Binder do not exist in 1.5.6, it seems it has a big change from 1.5.6 to 2.0.0. So I want to know if has some documents record these change and guide how to correctly map properties to java class in spring boot 2?