由于缺少QClass，弹簧引导未编译

Question

嗨，我是spring-boot的新手，我一直试图将querDSL集成到我的项目中，但每次打包时都会出错。例如，它会说我的QClasses将不存在，即使它们已经通过maven正确导入。我尝试过不同版本的queryDSL，但都没有找到解决方案。我认为这是我的pom文件的问题，尽管我不确定，因为我已经遵循了Baeldung制作的教程。任何建议都会有帮助，谢谢。

我的确切错误

Error:(11, 8) java: cannot access com.querydsl.core.types.OrderSpecifier
class file for com.querydsl.core.types.OrderSpecifier not found
This is in the Repo class below

我的Pom.xml

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>2.3.1.RELEASE</version>
<relativePath/> <!-- lookup parent from repository -->
</parent>
<groupId>rc</groupId>
<artifactId>springboot-mongodb-demo</artifactId>
<version>0.0.1-SNAPSHOT</version>
<name>springboot-mongodb-demo</name>
<description>Demo project for Spring Boot with Mongo Db</description>
<properties>
<java.version>1.8</java.version>
<querydsl.version>4.1.3</querydsl.version>
</properties>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-data-mongodb</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
<exclusions>
<exclusion>
<groupId>org.junit.vintage</groupId>
<artifactId>junit-vintage-engine</artifactId>
</exclusion>
</exclusions>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>com.querydsl</groupId>
<artifactId>querydsl-jpa</artifactId>
<version>4.1.3</version>
</dependency>
<dependency>
<groupId>com.mysema.querydsl</groupId>
<artifactId>querydsl-mongodb</artifactId>
<version>3.6.6</version>
</dependency>
<dependency>
<groupId>com.mysema.querydsl</groupId>
<artifactId>querydsl-apt</artifactId>
<version>3.6.6</version>
</dependency>

</dependencies>
<build>
<plugins>
<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>
org.springframework.data.mongodb.repository.support.MongoAnnotationProcessor
</processor>
</configuration>
</execution>
</executions>
</plugin>
</plugins>
</build>

我的回购层代码

package rc.springbootmongodbdemo;
import org.springframework.data.mongodb.repository.MongoRepository;
import org.springframework.data.mongodb.repository.Query;
import org.springframework.data.querydsl.QuerydslPredicateExecutor;
import org.springframework.stereotype.Repository;
import java.util.*;
@Repository
public interface HotelRepository extends MongoRepository<Hotel, String>, QuerydslPredicateExecutor<Hotel> {
Hotel findByID(String id);
List<Hotel> findByPricePerNightLessThan(int maxPrice);
@Query(value = "{address.city:?0}")
List<Hotel> findByCity(String city);
}

Answer 1

检查之前回答的问题Spring Boot+JPA+QueryDSL=找不到OrderSpecifier

也要经历这个https://www.baeldung.com/intro-to-querydsl

Answer 2

解决方案：我有一个正在扩展MongoRepository的存储库类。我在下面的中通过

public interface HotelRepository extends MongoRepository<Hotel, String>, QuerydslPredicateExecutor<Hotel>{

移除后：QuerydslPredicateExecutor

我的错误消失了，我的程序又开始正常运行了。我觉得querydslpestiteexecutor可能是一种较旧的代码格式，它没有编译到我的新版本中。只是一个理论。