I'm experiencing an RMI Marshalling problem using Hibernate with EJB. The problem isn't so much to do with Hibernate as such - more of a side-effect of using it.
Basically, my POJO class (Country) has a java.util.Set variable because I have a one-to-many relationship in my database between COUNTRY and USER. When I try to return an instance of type Country from an EJB, I am getting an RMI Marshalling exception becuase java.util.Set does not implement Serializable.
This problem does not arise with classes where all the variables are of serializable types.
...
private java.lang.String ISOCode;
private java.lang.String Name;
private java.lang.String TwoCharacterCode;
private java.lang.String ThreeCharacterCode;
private java.lang.String OfficialName;
private java.lang.String InternationalDialCode;
private java.util.Set SetOfUser;
....
<?xml version="1.0"?>
<!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
"http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
<hibernate-mapping>
<!--
Auto-generated mapping file from
the hibernate.org cfg2hbm engine
-->
<class name="com.myApp.common.dto.Country" table="country">
<id name="ISOCode" type="java.lang.String">
<column name="ISO_CODE" length="3" not-null="true" sql-type="char" />
<generator class="assigned"/>
</id>
<property name="Name" type="java.lang.String">
<column name="NAME" length="100" not-null="true" sql-type="varchar" />
</property>
<property name="TwoCharacterCode" type="java.lang.String">
<column name="TWO_CHARACTER_CODE" length="2" not-null="true" sql-type="varchar" />
</property>
<property name="ThreeCharacterCode" type="java.lang.String">
<column name="THREE_CHARACTER_CODE" length="3" not-null="true" sql-type="varchar" />
</property>
<property name="OfficialName" type="java.lang.String">
<column name="OFFICIAL_NAME" length="100" not-null="true" sql-type="varchar" />
</property>
<property name="InternationalDialCode" type="java.lang.String">
<column name="INT_DIAL_CODE" length="5" not-null="true" sql-type="varchar" />
</property>
<set name="SetOfUser">
<key>
<column name="COUNTRY_ISO_CODE" length="3" not-null="false" unique="true" />
</key>
<one-to-many class="com.myApp.common.dto.User" />
</set>
</class>
</hibernate-mapping>
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