java - NucleusUserException: Cannot access field on entity extending mapped superclass -


i running nucleususerexception while querying google datastore instance. querying field exists on mappedsuperclass on class extends it. here abstract class contains field interested in:

@entity @mappedsuperclass @jsonignoreproperties({ "password" }) public abstract class abstractuser implements user {   @persistent   protected string emailaddress;    public void setemailaddress(string email) {      this.emailaddress = email;   }    public string getemailaddress() {     return this.emailaddress;   }    @id   @generatedvalue(strategy = generationtype.identity)   private long key;    //other stuff. }

the concrete instance looks this:

@entity public class client extends abstractuser { //things clients have. }

my query failing looks this:

list existinguserswithemail = manager                               .createquery(                              "select c client c c.emailaddress = :mail")                              .setparameter("mail", request.getemailaddress())                              .getresultlist();

the exception this:

cannot access field emailaddress on type org.workouthound.user.client org.datanucleus.exceptions.nucleususerexception: cannot access field emailaddress on type org.workouthound.user.client @ org.datanucleus.query.compiler.javaquerycompiler.gettype(javaquerycompiler.java:552) @ org.datanucleus.query.compiler.javaquerycompiler.gettype(javaquerycompiler.java:529) @ org.datanucleus.query.symbol.symboltable.gettype(symboltable.java:118) @ org.datanucleus.query.expression.primaryexpression.bind(primaryexpression.java:118) @ org.datanucleus.query.expression.dyadicexpression.bind(dyadicexpression.java:85) @ org.datanucleus.query.compiler.javaquerycompiler.compilefilter(javaquerycompiler.java:299) @ org.datanucleus.query.compiler.jpqlcompiler.compile(jpqlcompiler.java:75) @ org.datanucleus.store.query.abstractjpqlquery.compileinternal(abstractjpqlquery.java:246) @ org.datanucleus.store.query.query.setimplicitparameter(query.java:690) @ org.datanucleus.jpa.jpaquery.setparameter(jpaquery.java:428) @ org.workouthound.rest.client.userresources.emailisregistered(userresources.java:55) @ org.workouthound.rest.client.userresources.createclient(userresources.java:33)

i new datanucleus , google data store. attempted follow tutorial outlined here have missed something. please let me know additional information necessary.

update:
if change field name email getters, setters , query, works...why?


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