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QuerydslPredicate with spring-boot-starter-jpa

2017-02-13 180 views
0

我在自动生成com.querydsl中的Q classess时遇到问题。我知道com.query.dsl和spring-boot-jpa之间的兼容性可能存在错误，但是我尝试了很多版本而没有任何积极的结果。这是我的pom.xmlQuerydslPredicate with spring-boot-starter-jpa

<dependencies> 
    <dependency> 
     <groupId>org.springframework.boot</groupId> 
     <artifactId>spring-boot-starter-data-rest</artifactId> 
    </dependency> 
    <dependency> 
     <groupId>org.springframework.boot</groupId> 
     <artifactId>spring-boot-starter-web</artifactId> 
    </dependency> 
    <dependency> 
     <groupId>org.springframework.boot</groupId> 
     <artifactId>spring-boot-starter-test</artifactId> 
     <scope>test</scope> 
    </dependency> 
    <dependency> 
     <groupId>org.postgresql</groupId> 
     <artifactId>postgresql</artifactId> 
     <version>9.4.1212.jre7</version> 
    </dependency> 
    <dependency> 
     <groupId>org.springframework.boot</groupId> 
     <artifactId>spring-boot-starter-data-jpa</artifactId> 
    </dependency> 
    <dependency> 
     <groupId>org.apache.commons</groupId> 
     <artifactId>commons-dbcp2</artifactId> 
     <version>2.1.1</version> 
    </dependency> 
    <dependency> 
     <groupId>org.springframework.boot</groupId> 
     <artifactId>spring-boot-starter-tomcat</artifactId> 
    </dependency> 
    <dependency> 
     <groupId>org.apache.commons</groupId> 
     <artifactId>commons-lang3</artifactId> 
     <version>3.4</version> 
    </dependency> 
    <dependency> 
     <groupId>org.projectlombok</groupId> 
     <artifactId>lombok</artifactId> 
     <version>1.16.12</version> 
    </dependency> 
    <dependency> 
     <groupId>org.springframework.boot</groupId> 
     <artifactId>spring-boot-starter-aop</artifactId> 
     <version>1.4.3.RELEASE</version> 
    </dependency> 
    <dependency> 
     <groupId>com.google.guava</groupId> 
     <artifactId>guava</artifactId> 
     <version>21.0</version> 
    </dependency> 
    <dependency> 
     <groupId>commons-beanutils</groupId> 
     <artifactId>commons-beanutils</artifactId> 
     <version>1.9.3</version> 
    </dependency> 
    <dependency> 
     <groupId>io.springfox</groupId> 
     <artifactId>springfox-swagger2</artifactId> 
     <version>2.6.1</version> 
    </dependency> 
    <dependency> 
     <groupId>io.springfox</groupId> 
     <artifactId>springfox-swagger-ui</artifactId> 
     <version>2.6.1</version> 
    </dependency> 
    <dependency> 
     <groupId>com.querydsl</groupId> 
     <artifactId>querydsl-jpa</artifactId> 
     <version>4.0.7</version> 
    </dependency> 
</dependencies> 

<build> 
    <plugins> 
     <plugin> 
      <groupId>com.mysema.maven</groupId> 
      <artifactId>apt-maven-plugin</artifactId> 
      <version>1.1.3</version> 
      <executions> 
       <execution> 
        <id>process-common-model</id> 
        <goals> 
         <goal>process</goal> 
        </goals> 
        <configuration> 
         <outputDirectory>target/generated-sources/apt</outputDirectory> 
         <processors> 
          <processor>com.query.apt.jpa.JPAAnnotationProcessor</processor> 
         </processors> 
        </configuration> 
       </execution> 
      </executions> 
      <dependencies> 
       <dependency> 
        <groupId>com.querydsl</groupId> 
        <artifactId>querydsl-apt</artifactId> 
        <version>4.0.7</version> 
       </dependency> 
      </dependencies> 
     </plugin> 
     <plugin> 
      <groupId>org.springframework.boot</groupId> 
      <artifactId>spring-boot-maven-plugin</artifactId> 
     </plugin> 
    </plugins> 
</build>

错误

产生的原因：org.springframework.beans.BeanInstantiationException：无法实例[org.springframework.data.jpa.repository.support.QueryDslJpaRepository] ：构造函数抛出异常;嵌套异常是java.lang.IllegalArgumentException：没有为域类com.coig.prek.webservice.modules.quiz.entiry.Quiz找到查询类com.coig.prek.webservice.modules.quiz.entiry.QQuiz！ at org.springframework.beans.BeanUtils.instantiateClass（BeanUtils.java:154）〜[spring-beans-4.3.6.RELEASE.jar：4.3.6.RELEASE] at org.springframework.data.repository.core。 support.RepositoryFactorySupport.getTargetRepositoryViaReflection（RepositoryFactorySupport.java:365）〜[spring-data-commons-1.13.0.RELEASE.jar：na] at org.springframework.data.jpa.repository.support.JpaRepositoryFactory.getTargetRepository（JpaRepositoryFactory。 java：101）〜[spring-data-jpa-1.11.0.RELEASE.jar：na] at org.springframework.data.jpa.repository.support.JpaRepositoryFactory.getTargetRepository（JpaRepositoryFactory.java:81）〜[spring- data-jpa-1.11.0.RELEASE.jar：na] at org.springframework.data.repository.core.support.RepositoryFactorySupport.getRepository（RepositoryFactorySupport.java:199）〜[spring-data-commons-1.13.0。 RELEASE.jar：na] at org.springframework.data。org.springframework.data.repository.core.support.RepositoryFactoryBeanSupport.initAndReturn（RepositoryFactoryBeanSupport.java:277）〜[spring-data-commons-1.13.0.RELEASE.jar：na] 。 repository.core.support.RepositoryFactoryBeanSupport.afterPropertiesSet（RepositoryFactoryBeanSupport.java:263）〜[spring-data-commons-1.13.0.RELEASE.jar：na] at org.springframework.data.jpa.repository.support.JpaRepositoryFactoryBean。 afterPropertiesSet（JpaRepositoryFactoryBean.java:101）〜[spring-data-jpa-1.11.0.RELEASE.jar：na] at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.invokeInitMethods（AbstractAutowireCapableBeanFactory.java:1687）〜[ spring-beans-4.3.6.RELEASE.jar：4.3.6.RELEASE] at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean（AbstractAutowireCapableBeanFactory.ja va：1624）〜[spring-beans-4.3.6.RELEASE.jar：4.3.6.RELEASE] ... 47常见帧遗漏 引起：java.lang.IllegalArgumentException：未找到查询类com。 coig.prek.webservice.modules.quiz.entiry.QQuiz for domain class com.coig.prek.webservice.modules.quiz.entiry.Quiz！ at org.springframework.data.jpa.repository处的org.springframework.data.querydsl.SimpleEntityPathResolver.createPath（SimpleEntityPathResolver.java:63）〜[spring-data-commons-1.13.0.RELEASE.jar：na] 。 support.QueryDslJpaRepository。（QueryDslJpaRepository.java:84）〜[spring-data-jpa-1.11.0.RELEASE.jar：na] at org.springframework.data.jpa.repository.support.QueryDslJpaRepository。（QueryDslJpaRepository.java： 68）〜[spring-data-jpa-1.11.0.RELEASE.jar：na] at sun.reflect.NativeConstructorAccessorImpl.newInstance0（Native Method）〜[na：1.8.0_111] at sun.reflect.NativeConstructorAccessorImpl.newInstance （NativeConstructorAccessorImpl.java:62）〜[na：1.8.0_111] at sun.reflect.DelegatingConstructorAccessorImpl.newInstance（DelegatingConstructorAccessorImpl.java:45）〜[na：1.8.0_111] at j ava.lang.reflect.Constructor.newInstance（Constructor.java:423）〜[na：1.8.0_111] at org.springframework.beans.BeanUtils.instantiateClass（BeanUtils.java:142）〜[spring-beans-4.3。 6.RELEASE.jar：4.3.6.RELEASE] ... 56常见帧遗漏 引起：java.lang.ClassNotFoundException：com.coig.prek.webservice.modules.quiz.entiry.QQuiz at java.net .URLClassLoader。findClass（URLClassLoader.java:381）〜[na：1.8.0_111] at java.lang.ClassLoader.loadClass（ClassLoader.java:424）〜[na：1.8.0_111] at sun.misc.Launcher $ AppClassLoader。 loadClass（Launcher.java:331）〜[na：1.8.0_111] at java.lang.ClassLoader.loadClass（ClassLoader.java:357）〜[na：1.8.0_111] at org.springframework.util.ClassUtils。 forName（ClassUtils.java:250）〜[spring-core-4.3.6.RELEASE.jar：4.3.6.RELEASE] at org.springframework.data.querydsl.SimpleEntityPathResolver.createPath（SimpleEntityPathResolver.java:53）〜[弹簧数据公地1.13.0.RELEASE.jar：NA] ... 63个共同帧省略

存储库：

@Repository 
public interface QuizRepository extends PagingAndSortingRepository<Quiz, Long>, QueryDslPredicateExecutor<Quiz> { 
}

而且实体：

@javax.persistence.Entity 
@Table(name = "QUIZ", uniqueConstraints = { 
     @UniqueConstraint(columnNames = "NAME") 
}) 
@ToString 
public class Quiz extends Entity{ 

    @Column(name = "NAME") 
    private @Setter @Getter String name; 
    @Column(name = "TYPE") 
    private @Setter @Getter Integer type; 
    @Column(name = "TIME") 
    private @Setter @Getter Long time; 
    @JsonProperty(value = "branch") 
    @Column(name = "BRANCH") 
    private @Setter @Getter Integer branch; 

    @OneToMany 
    private @Setter @Getter Set<Question> questions; 

    public Quiz() {} 

}

你能告诉我，如果我失去了一些东西，或者什么，我做错了什么？ 感谢您的帮助。

来源

2017-02-13 rdabrowski

+0

对于初学者停止混合春天启动的版本（1.5.1和1.4.3和？）。永远不要混合框架的版本（不管框架）。 –

+0

是的，我的错误，忘了在检查谷歌中找到的另一个解决方案后修复代码。 （这不是解决我的主要问题） – rdabrowski

回答

0

下面是有关如何使用QueryDSL一个例子：

包括以下依赖性在pom.xml文件：

<dependency> 
     <groupId>io.springlets</groupId> 
     <artifactId>springlets-boot-starter-data-jpa</artifactId> 
    </dependency> 
    <dependency> 
     <groupId>com.querydsl</groupId> 
     <artifactId>querydsl-jpa</artifactId> 
    </dependency>

此外，包括以下插件能够生成Q类：

  <plugin> 
       <groupId>com.mysema.maven</groupId> 
       <artifactId>apt-maven-plugin</artifactId> 
       <version>1.1.3</version> 
       <executions> 
        <execution> 
         <goals> 
          <goal>process</goal> 
         </goals> 
         <configuration> 
          <outputDirectory>target/generated-sources/java</outputDirectory> 
          <processor>com.querydsl.apt.jpa.JPAAnnotationProcessor</processor> 
         </configuration> 
        </execution> 
       </executions> 
       <dependencies> 
        <dependency> 
         <groupId>com.querydsl</groupId> 
         <artifactId>querydsl-apt</artifactId> 
         <version>${querydsl.version}</version> 
        </dependency> 
        <dependency> 
         <groupId>com.querydsl</groupId> 
         <artifactId>querydsl-jpa</artifactId> 
         <version>${querydsl.version}</version> 
        </dependency> 
       </dependencies> 
      </plugin>

现在，创建一个名为QuizRepositoryCustom的新存储库接口并定义我你想提供的方法。

public interface QuizRepositoryCustom { 

    // SAMPLE METHOD TO SEARCH QUIZ BY NAME 
    public Page<Quiz> findByNameLike(String name, Pageable pageable); 

}

创建QuizRepositoryCustom的实施。这个类应该扩展QueryDslRepositorySupport

public class QuizRepositoryImpl extends QueryDslRepositorySupport<Quiz> implements QuizRepositoryCustom { 

    QuizRepositoryImpl() { 
     super(Quiz.class); 
    } 

    public Page<Quiz> findByNameLike(String name, Pageable pageable) { 

     QQuiz quiz = QQuiz.quiz; 

     JPQLQuery<Quiz> query = from(quiz); 

     if (StringUtils.isNotEmpty(name)) { 
      BooleanBuilder searchCondition = new BooleanBuilder();       

      searchCondition.and(quiz.name.eq(name)); 

      if (searchCondition.hasValue()) { 
      query.where(searchCondition); 
      } 
     } 

     long totalFound = query.fetchCount(); 
     List<Quiz> results = query.select(quiz).fetch(); 
     return new PageImpl<M>(results, pageable, totalFound); 
    } 

}

现在，从JpaRepository<Quiz, Long>和QuizRepositoryCustom接口扩展QuizRepository接口。

public interface QuizRepository extends QuizRepositoryCustom, JpaRepository<Quiz, Long> { 

}

通过这些简单的步骤，您就可以使用QueryDSL。

另外，您可以检查以下项目，其中包含有关如何使用QueryDSL的更多示例。

https://github.com/jcagarcia/proofs/tree/master/spring-security-and-formatters/src/main/java/org/springframework/roo/petclinic/repository

希望它能帮助，

来源

2017-02-13 07:50:49 jcgarcia

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