Hibernate元模型生成器如何工作? [英] How does Hibernate Metamodel Generator work?

问题描述

最近刚刚从Hibernate Session api迁移到JPA2.我假设这应该是一些设置问题.但是基本上我的日食无法识别元模型属性.

Recently just making a move from Hibernate Session api to JPA2. I am assuming it should be some setup problem. But basically my eclipse does not recognize Metamodel attribute.

例如:builder.like( root.get(Book_.name) , search) Book_无法解析为变量.

For example: builder.like( root.get(Book_.name) , search) Book_ can not be resolved as variable.

现在，我已遵循此 http://hibernate.org/orm/tooling/并添加

Now I have followed this http://hibernate.org/orm/tooling/ and added

<dependency>
  <groupId>org.hibernate</groupId>
  <artifactId>hibernate-jpamodelgen</artifactId>
  <version>5.2.6.Final</version>
</dependency>

如此处所述 https://docs .jboss.org/hibernate/orm/5.0/topical/html/metamodelgen/MetamodelGenerator.html

在大多数情况下，只要将处理器jar添加到构建类路径中，注释处理器就会自动运行

In most cases the annotation processor will automatically run provided the processor jar is added to the build classpath

我已经检查了我的构建路径，其中包括所有maven依赖关系，包括jpamodelgen，但是我的日食仍然说Book_无法解决.

I have checked my build path it included all maven dependency including jpamodelgen, but my eclipse still say Book_ can not be resolved.

我在做什么错了?

这是我的道...

CriteriaBuilder builder = entityManager.getCriteriaBuilder();

    CriteriaQuery<Book> criteria = builder.createQuery(Book.class);

    Root<Book> root = criteria.from(Book.class);

    criteria.select(root);

    if( search != null && !search.isEmpty() ){

        criteria.where(builder.add(
                builder.like( root.get(Book_.name) , search),  // Book_ cannot be resolved a variable
                builder.like(root.get(Book_.ispn), search)    //  ""
                )
        );

    }

    List<Book> books = entityManager.createQuery(criteria).getResultList();

    return books;

我的依赖

   <properties>
    <spring-version>4.3.5.RELEASE</spring-version>
    <hibernate-version>5.2.6.Final</hibernate-version> 
   </properties>  
   <dependencies>
    <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-core</artifactId>
        <version>${spring-version}</version>
    </dependency>
    <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-beans</artifactId>
        <version>${spring-version}</version>
    </dependency>
    <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-context</artifactId>
        <version>${spring-version}</version>
    </dependency>
    <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-orm</artifactId>
        <version>${spring-version}</version>
    </dependency>
    <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-web</artifactId>
        <version>${spring-version}</version>
    </dependency>
    <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-webmvc</artifactId>
        <version>${spring-version}</version>
    </dependency>
    <dependency>
        <groupId>com.zaxxer</groupId>
        <artifactId>HikariCP</artifactId>
        <version>2.5.1</version>
    </dependency>
    <dependency>
        <groupId>org.hibernate</groupId>
        <artifactId>hibernate-core</artifactId>
        <version>${hibernate-version}</version>
    </dependency>
    <dependency>
        <groupId>org.hibernate</groupId>
        <artifactId>hibernate-orm-modules</artifactId>
        <version>${hibernate-version}</version>
        <type>pom</type>
    </dependency>
    <dependency>
      <groupId>org.hibernate</groupId>
      <artifactId>hibernate-jpamodelgen</artifactId>
      <version>${hibernate-version}</version>
    </dependency>
    <dependency>
        <groupId>org.hibernate</groupId>
        <artifactId>hibernate-validator</artifactId>
        <version>5.3.4.Final</version>
    </dependency>
    <dependency>
        <groupId>javax.servlet</groupId>
        <artifactId>jstl</artifactId>
        <version>1.2</version>
    </dependency>

    <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-jdbc</artifactId>
        <version>${spring-version}</version>
    </dependency>
    <dependency>
        <groupId>mysql</groupId>
        <artifactId>mysql-connector-java</artifactId>
        <version>5.1.40</version>
    </dependency>
    <dependency>
        <groupId>com.fasterxml.jackson.core</groupId>
        <artifactId>jackson-databind</artifactId>
        <version>2.8.6</version>
    </dependency>
    <dependency>
        <groupId>com.fasterxml.jackson.core</groupId>
        <artifactId>jackson-core</artifactId>
        <version>2.8.6</version>
    </dependency>
    <dependency>
        <groupId>com.fasterxml.jackson.core</groupId>
        <artifactId>jackson-annotations</artifactId>
        <version>2.8.6</version>
    </dependency>
    <dependency>
        <groupId>javax.transaction</groupId>
        <artifactId>jta</artifactId>
        <version>1.1</version>
    </dependency>

谢谢

推荐答案

如果您的目标不包含生成的类，则需要配置maven处理器，就像您

if your target doesn't contains the generated classed you need to configure maven processor like in the documentation that you provided.

如果您的目标包含生成的类，那么您要做的就是将它们添加到您的类路径中: 如果您使用的是eclipse:

If your target contains the generated classes, then all you have to to do is to add them your classpath : if you are using eclipse:

1. 右键单击您的项目
2. 属性
3. Java构建路径
4. 添加文件夹
5. 在target/generated-sources下选择包含已生成的MetaModel的文件夹

1. Right click on your project
2. Properties
3. Java build path
4. Add folder
5. choose the folder under target/generated-sources that contains the generated MetaModel

这篇关于Hibernate元模型生成器如何工作?的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！