Hector object mapper issue

[VB]

I am using hector API (with JPA annotations) and I keep getting message : me.prettyprint.hom.cache.HectorObjectMapperException: Property, User.UserId, does not have proper setter/getter. There is not users column family. I have also added @AnonymousPropertyAddHandler and @AnonymousPropertyCollectionGetter annotated functions to handle unknow property, I still get this exception.    

Code snippet 

    @Id

    @Column(name="UserId")

    public String UserId;

    public String getUserId() {

        return this.UserId;

    }

    public void setUserId(String userId) {

        this.UserId = userId;

    }

Cassandra type for UserId

    "UserId" text PRIMARY KEY

Exception in thread "main" me.prettyprint.hom.cache.HectorObjectMapperException: Property, User.UserId, does not have proper setter/getter

at me.prettyprint.hom.ClassCacheMgr.initializePropertiesMapDef(ClassCacheMgr.java:196)

at me.prettyprint.hom.ClassCacheMgr.initializeCacheForClass(ClassCacheMgr.java:123)

at me.prettyprint.hom.EntityManagerImpl.initializeClasspath(EntityManagerImpl.java:93)

at me.prettyprint.hom.EntityManagerImpl.initialize(EntityManagerImpl.java:79)

at me.prettyprint.hom.EntityManagerImpl.<init>(EntityManagerImpl.java:64)

at me.prettyprint.hom.EntityManagerImpl.<init>(EntityManagerImpl.java:41)

at com.coupons.nextgen.dao.OffersDaoImpl.main(OffersDaoImpl.java:18)

at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)

at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)

at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)

at java.lang.reflect.Method.invoke(Method.java:597)

at com.intellij.rt.execution.application.AppMain.main(AppMain.java:120)

Any clue what is wrong?