java - Error:The import com.google.appengine.api.datastore cannot be resolved JPA GAE GWT -


error in development mode 

[error] [cbd] - line 15: import com.google.appengine.api.datastore cannot resolved

user.java

@entity public class user implements serializable {      private static final long serialversionuid = 1l;      @id     @column(name="id")     @generatedvalue(strategy = generationtype.identity)     private key id;      private string googleid;      private string firstname;      private string lastname;      private string password;      private string gender;      private string email;       @onetoone(cascade=cascadetype.all)     @joincolumn(name="key")     private authenticationtoken token= authenticationtoken();     ......}

authenticationtoken.java

public class authenticationtoken implements serializable {      /**      *       */     private static final long serialversionuid = 1l;      @id     @column(name="key")     @generatedvalue(strategy = generationtype.identity)     private key key;      private string email;      private string token;      private date obtained;      private date activity;     .....}

persistence.xml

<?xml version="1.0" encoding="utf-8" ?> <persistence xmlns="http://java.sun.com/xml/ns/persistence"     xmlns:xsi="http://www.w3.org/2001/xmlschema-instance"     xsi:schemalocation="http://java.sun.com/xml/ns/persistence         http://java.sun.com/xml/ns/persistence/persistence_1_0.xsd" version="1.0">      <persistence-unit name="transactions-optional">           <provider>org.datanucleus.api.jpa.persistenceproviderimpl</provider>          <class>com.cbd.shared.entities.user</class>      <class>com.cbd.shared.entities.authenticationtoken</class>      <exclude-unlisted-classes>true</exclude-unlisted-classes>          <properties>             <property name="datanucleus.nontransactionalread" value="true"/>             <property name="datanucleus.nontransactionalwrite" value="true"/>             <property name="datanucleus.connectionurl" value="appengine"/>         </properties>     </persistence-unit> </persistence>

i'm using gwt tried moving entities server side rather shared side package same error

found error .was not adding datanucleus plugin eclipse therefore of jpa libraries wasn't defined in project runtime


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