java - Giving exception while mapping the simple value type of collection in hibernatre -

i have entity called person has name property string , person petnames has collection. when mapping hibernate getting exception. how can resolve problem?

    /*  * change template, choose tools | templates  * , open template in editor.  */ package com.myapp.struts;  import java.io.serializable;  import java.util.set; import javax.persistence.collectiontable; import javax.persistence.elementcollection; import javax.persistence.entity; import javax.persistence.generatedvalue; import javax.persistence.generationtype; import javax.persistence.id; import javax.persistence.joincolumn;  /**  *  * @author hyva  */ @entity public class person implements serializable {      private static final long serialversionuid = 1l;         private long id;      @id     @generatedvalue(strategy = generationtype.auto)     public long getid() {         return id;     }      public string getname() {         return name;     }      public void setname(string name) {         this.name = name;     }      public void setpetname(set<string> petname) {         this.petname = petname;     }      public void setid(long id) {         this.id = id;     }     private string name;     private set<string> petname;      @elementcollection     @collectiontable(name = "petname", joincolumns =             @joincolumn(name = "person_id"))     public set<string> getpetname() {         return petname;     } } 

*exception:*

initial sessionfactory creation failed.org.hibernate.mappingexception: not determine type for: java.util.set, columns: [org.hibernate.mapping.column(petname)] exception in thread "main" java.lang.exceptionininitializererror     @ com.myapp.struts.hibernateutil.<clinit>(hibernateutil.java:28)     @ com.myapp.struts.hibernatecomplexvalue.main(hibernatecomplexvalue.java:19) caused by: org.hibernate.mappingexception: not determine type for: java.util.set, columns: [org.hibernate.mapping.column(petname)]     @ org.hibernate.mapping.simplevalue.gettype(simplevalue.java:266)     ajava result: 1 

move @collectiontable on annotation on getpetname shown below:

private set<string> petname;  @elementcollection @collectiontable(name = "pets", joincolumns =@joincolumn(name = "person_id")) public set<string> getpetname(){       return petname; }