JPA抛出-“错误：用户缺乏特权或找不到对象：Book”

Question

在我的项目中，我使用HSQLDB作为数据库。构建了数据库并添加了两个条目。现在我正在尝试用JPA获取这些条目。不幸的是，获得以下异常

错误：用户缺乏权限或找不到对象：BOOK javax.persistence.persistenceexception：org.hibernate.exception.sqlgrammarexception：无法在org.hibernate.jpa.spi.abstractentymanagerimpl.convert（abstractentymanagerimpl.java:1692)在org.hibernate.jpa.spi.abstractentymanagerimpl.convert（abstractentymanagerimpl.java:1602)在org.hibernate.jpa.internal.queryimpl.getresultlist（queryimpl.java:492)在com.top.shelf.lib.entitymanagers.bookmanager.main（lgrammarexception：无法在org.hibernate.exception.internal.sqlexceptionTypeDelegate.convert(SqlexceptionTypeDelegate.java:63)在org.hibernate.exception.internal.standardsqlexceptionConverter.convert(StandardsqlexceptionConverter.42)在org.hibernate.engine.jdbc.spi.sqlexceptionHelper.convert(SqlexceptionHelper.109)在org.hibernate.engine.jdbc.internal.statementPreparationImpl$statementPreparationTemplate.PreparedStatement(StatementPreparerImpl.java:182)在org.hibernate.engine.jdbc.internal.StatementPreparerImpl.java:148)在org.hibernate.loader.loader.preparerQueryStatement（StatementPreparerImpl.java:148)在org.hibernate.loader.loader.preparerQueryStatement（loader.java:1928)在org.hibernate.loader.loader.executeQueryStatement（loader.java:1897)在org.hibernate.loader.executeQueryStatement（loader.java：1875）

下面是我的persistance.xml文件。

    <class>com.top.shelf.lib.entityManager.Book</class>

    <properties>
        <property name="javax.persistence.jdbc.url" value="jdbc:hsqldb:MyDB" />
        <property name="javax.persistence.jdbc.user" value="sa" />
        <property name="javax.persistence.jdbc.password" value="" />
        <property name="javax.persistence.jdbc.driver" value="org.hsqldb.jdbcDriver" />
        <property name="hibernate.dialect" value="org.hibernate.dialect.HSQLDialect" />
    </properties>
</persistence-unit>

和我的实体类：

@Entity
@Table(name = "BOOK")
public class Book {

    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    @Column(name = "ID")
    private int id;

    @Column(name = "TITLE")
    private String title;

    @Column(name = "AUTHOR")
    private String author;

    @Column(name = "BRIEF_DESCRIPTION")
    private String description;

    @Column(name = "ISBN")
    private String isbn;

    @Column(name = "LOCATION")
    private String location;

    @Column(name = "USER_ID")
    private String user_id;

    public Book(String title, String author, String description, String isbn,
            String location) {
        this.title = title;
        this.author = author;
        this.description = description;
        this.isbn = isbn;
        this.location = location;
    }

    public int getId() {
        return id;
    }

    public String getTitle() {
        return title;
    }

    public String getAuthor() {
        return author;
    }

    public String getDescription() {
        return description;
    }

    public String getIsbn() {
        return isbn;
    }

    public String getLocation() {
        return location;
    }

    public String getUser_id() {
        return user_id;
    }

}

Answer 1

尝试：

<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_2_0.xsd" version="2.0">
      <persistence-unit name="manager" transaction-type="RESOURCE_LOCAL">
        <provider>org.hibernate.ejb.HibernatePersistence</provider>
       <class>com.top.shelf.lib.entityManager.Book</class>

        <properties>
          <property name="javax.persistence.jdbc.driver" value="org.hsqldb.jdbcDriver"/>
          <property name="javax.persistence.jdbc.url" value="jdbc:hsqldb:MyDB"/>
          <property name="javax.persistence.jdbc.user" value="sa"/>
          <property name="javax.persistence.jdbc.password" value=""/>
          <property name="hibernate.dialect" value="org.hibernate.dialect.HSQLDialect"/>
          <property name="hibernate.hbm2ddl.auto" value="update"/>
        </properties>
      </persistence-unit>
    </persistence>