foreign-key problems

[Stephan Wiesner]

Hi list, I have a problem with foreign-key elements. Below is my tiny 
database definition and I can generate the SQL, if I remove the 
foreign-key element. With it, I get a nullpointer exception, though.
Can anybody, please, enlighten me?

java.lang.NullPointerException
       at 
org.apache.torque.engine.database.model.Database.doFinalInitialization(Database.java:444)

<database
 name="immorate"
 defaultIdMethod="idbroker">
 <table name="customer" description="Customer of Bank">
   <column
     name="c_id"
     required="true"
     primaryKey="true"
     type="INTEGER"
     description="Customer Id"/>
   <column
     name="lastname"
     required="true"
     type="VARCHAR"
     size="100"
     description=""/>
 </table>

 <table name="account" description="Bank account">
   <column
     name="accountnumber"
     required="true"
     primaryKey="true"
     type="INTEGER"
     description="Account number"/>
   <foreign-key foreignTable="customer"
     >
     <reference
       local="c_id"
       foreign="c_id"/>
   </foreign-key>
 </table>  
</database>



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