java – 错误:导入com.google.appengine.api.datastore无法解析
发布时间:2020-12-14 19:36:14 所属栏目:Java 来源:网络整理
导读:开发模式出错 [ERROR] [cbd] - Line 15: The import com.google.appengine.api.datastore cannot be resolved User.java @Entitypublic class User implements Serializable { private static final long serialVersionUID = 1L; @Id @Column(name="id") @Ge
开发模式出错
[ERROR] [cbd] - Line 15: The import com.google.appengine.api.datastore cannot be 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中 <?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> 我正在使用GWT尝试将实体移动到服务器端而不是共享端包但是同样的错误 解决方法
发现错误.没有将DataNucleus插件添加到eclipse中,因此在Project Runtime中没有明确定义一些JPA库
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