Error when trying to fetch changes for class extending HashMap - javers

Question

I'm trying a simple test where I try to commit an object of a Class that extends HashMap. I'm left with a MANAGED_CLASS_MAPPING_ERROR: given javaClass 'class com.vehco.Configuration' is mapped to MapType, expected ManagedType. Do Javers not support is-a but only has-a?
Been reading the documentation forwards and backwards but unable to find anything. Google was neither my friend this time around.
Please find the test code below:
Tester.java:
public class Tester {
Javers javers = JaversBuilder.javers().build();
public static void main(String[] args) {
Tester t = new Tester();
t.start();
}
private void start() {
Configuration data = new Configuration("global");
for (Integer i = 0; i < 10; i++) {
data.getProp().put(i.toString(), UUID.randomUUID().toString());
}
javers.commit("svenie",data);
for (Integer i = 0; i < 10; i++) {
if (i % 2 == 0)
data.getProp().put(i.toString(), UUID.randomUUID().toString());
}
javers.commit("svenie",data);
List<Shadow<Configuration>> changes = javers.findShadows(QueryBuilder.byClass(Configuration.class).build());
for (Shadow<Configuration> change : changes) {
System.out.println(change.getCommitMetadata());
}
}
}
Configuration.java:
public class Configuration extends HashMap<String,String> {
#Id
private String name;
private Properties prop = new Properties();
public Configuration(String name) {
this.name = name;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public Properties getProp() {
return prop;
}
}

Answer 1

Looks like the Javers type inferring is ambiguous here. On the one hand your class extends Map so JaVers can infer it as MapType, on the other hand it has #Id property, so JaVers can infer it as Entity. I think you have to decide which Javers type is better for your class and register this class explicitly using JaversBuilder.register*()?
A class can't be mapped to more than one Javers type.