'facing issue while annotating below are both classes and Hbm.xml mentioned have tried different method but receiving exception

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Below are both the class Conversion below Hbm.xml file with annotation facing issue while annotating have tried different method but receiving exception

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 public class Parent {
        
        private Set<Childaction>childactions=new HashSet<>();
        
        }
        
        public class Childaction extends parent {
            
            private Parent main;
            
            }
    
      
    
      <hibernate-mapping>
        <set name="childactions" table = "child table" cascade="save-update">
        <key column="ID1"foreign-key="Foreignkey1"/>
        <many-to-many column="Execute_id" unique="true" class="Childaction"/>
        </set>
        
        <subclass name="Childaction" extends="Parent" discriminator-value="not null">
        <join table="childtable" inverse="true" optional="true">
        <key column="Execute_id" foreign-key="foreignkey2"/>
        <many-to-one name="main" column="ID1"not-null="true"/>
        </join>
        </subclass>
        <filter name="main"/>
        </class>
        </hibernate-mapping>
hibernate-mapping


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