java - The entity has no primary key attribute defined -


i'm new jpa , have been struggling error time now. eclipse "saying" entity not have primary key defined, read bunch of tutorials , way it.

example: https://en.wikibooks.org/wiki/java_persistence/identity_and_sequencing#example_embedded_id_xml

<?xml version="1.0" encoding="utf-8" ?> <entity-mappings version="1.0"         xmlns="http://java.sun.com/xml/ns/persistence/orm"         xmlns:xsi="http://www.w3.org/2001/xmlschema-instance"         xsi:schemalocation="http://java.sun.com/xml/ns/persistence/orm orm_1_0.xsd">          <entity name="befriendableuser" class="com.projects.socialconnections.befriendableuser.befriendableuser" access="field">             <embedded-id class="com.projects.socialconnections.befriendableuser.befriendableuserid"/>            </entity>          <embeddable name="befriendableuserid" class="com.projects.socialconnections.befriendableuser.befriendableuserid" access="field">                 <attributes>                     <basic name="numid">                         <column name="befriendable_user_id" />                     </basic>                 </attributes>         </embeddable>  </entity-mappings>

your xml wrong, link (now corrected - refer jpa spec facts not wikis prone error).

embedded-id should under attributes element, , attribute name in embedded-id name, not class. see xsd schema @ http://xmlns.jcp.org/xml/ns/persistence/orm_2_1.xsd


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