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@QuerydslPredicate引发异常

querydsl spring-data-jpa spring-boot spring java

D-Dá´um · 技术社区 · 7 年前

@QuerydslPredicate 但我的测试API在调用时失败:

Servlet.service() for servlet [dispatcherServlet] in context with path [] threw exception [Request processing failed; nested exception is java.lang.IllegalStateException: No primary or default constructor found for interface com.querydsl.core.types.Predicate] with root cause

java.lang.NoSuchMethodException: com.querydsl.core.types.Predicate.< init >()

这是我的控制器类中的方法:

@ResponseBody
@RequestMapping(value = "/user/query", method = RequestMethod.GET)
public Iterable<User> getByCriteria(@QuerydslPredicate(root = User.class) Predicate predicate)
{
    return this.userDao.getByCriteria(predicate);
}

this 春季博客文章和 this example 尝试实现我的API,但我不明白我做错了什么。

pom.xml:

<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 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>

    <groupId>com.example</groupId>
    <artifactId>email-encrypt</artifactId>
    <version>1.0.0-SNAPSHOT</version>
    <packaging>jar</packaging>

    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.0.2.RELEASE</version>
    </parent>
    <name>email-encrypt</name>
    <url>http://maven.apache.org</url>

    <properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <querydsl.version>4.1.4</querydsl.version>
        <springfox.version>2.6.1</springfox.version>
    </properties>

    <dependencies>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-mail</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-thymeleaf</artifactId>
        </dependency>

        <dependency>
            <groupId>org.bouncycastle</groupId>
            <artifactId>bcprov-jdk15on</artifactId>
            <version>1.59</version>
        </dependency>

        <dependency>
            <groupId>org.bouncycastle</groupId>
            <artifactId>bcpkix-jdk15on</artifactId>
            <version>1.59</version>
        </dependency>

        <dependency>
            <groupId>org.bouncycastle</groupId>
            <artifactId>bcmail-jdk15on</artifactId>
            <version>1.59</version>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-data-jpa</artifactId>
        </dependency>

        <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>

        <dependency>
            <groupId>org.apache.derby</groupId>
            <artifactId>derby</artifactId>
            <version>10.14.1.0</version>
            <scope>runtime</scope>
        </dependency>


        <dependency>
            <groupId>io.springfox</groupId>
            <artifactId>springfox-swagger2</artifactId>
            <version>${springfox.version}</version>
            <scope>compile</scope>
        </dependency>
        <dependency>
            <groupId>io.springfox</groupId>
            <artifactId>springfox-swagger-ui</artifactId>
            <version>${springfox.version}</version>
            <scope>compile</scope>
        </dependency>
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <version>1.16.20</version>
        </dependency>
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <version>1.16.20</version>
        </dependency>
    </dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
            <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>${build.directory}/generated-sources/java</outputDirectory>
                            <processor>com.querydsl.apt.jpa.JPAAnnotationProcessor</processor>
                        </configuration>
                    </execution>
                </executions>
            </plugin>
        </plugins>
    </build>
</project>

编辑#2

here

2 回复 | 直到 7 年前

cristobalrosa 7 年前

如果您注释掉swagger配置类上的@Configuration,那么它就可以工作了。我仍然在试图理解为什么,我猜在这个注释中,spring加载配置的方式是不同的,这是导致问题的原因。

//@Configuration
@EnableSwagger2
public class SwaggerConfiguration extends WebMvcConfigurationSupport

Stefan Repcek 7 年前

我认为你的问题在于pom.xml文件. 请确保您使用的是兼容版本的查询dsl。例如,如果您使用 spring-data-jpa 2.0.8,您应该使用 querydsl-*

<dependency>
    <groupId>org.springframework.data</groupId>
    <artifactId>spring-data-jpa</artifactId>
    <version>2.0.8.RELEASE</version>
</dependency>

<dependency>
    <groupId>com.querydsl</groupId>
    <artifactId>querydsl-*</artifactId>
    <version>4.1.4</version>
</dependency>

你可以登记入住 maven repository

编辑1 尝试将querydsl核心添加到maven中:

 <dependency>
        <groupId>com.querydsl</groupId>
        <artifactId>querydsl-core</artifactId>
        <version>4.1.4</version>
 </dependency>

aksh1618 5 年前

延伸 @cristobalrosa's answer ,这可能是由于springboot没有配置web应用程序。例如,我的项目也有 SwaggerConfig 延伸 WebMvcConfigurationSupport

@Configuration
@EnableSwagger2
public class SwaggerConfig extends WebMvcConfigurationSupport {
    // Docket bean
    
    @Override
    protected void addResourceHandlers(ResourceHandlerRegistry registry) {
        registry.addResourceHandler("swagger-ui.html").addResourceLocations("classpath:/META-INF/resources/");
    }
}

注:除此之外 WebMVCConfiguration支持 ,比如 @EnableWebMvc &安培; WebMvcConfigurer 也可能导致没有使用springboot的web自动配置。

Swagger Issue comment

hynuah_iia 4 年前

我只想和大家分享一下情况,可以给大家一些提示。所以看看我的配置和依赖关系,阅读我链接的文章。尝试 @EnableWebMvc 而不是“WebMvcConfigurationSupport”

java.lang.IllegalStateException: No primary or default constructor found for interface com.querydsl.core.types.Predicate
Caused by: java.lang.NoSuchMethodException: com.querydsl.core.types.Predicate.<init>()
    at java.base/java.lang.Class.getConstructor0(Class.java:3427)
    at java.base/java.lang.Class.getDeclaredConstructor(Class.java:2631)
    at org.springframework.web.method.annotation.ModelAttributeMethodProcessor.createAttribute(ModelAttributeMethodProcessor.java:216)

依赖关系

    dependencies {
        implementation 'org.springframework.boot:spring-boot-starter-web'
        implementation "org.springframework.data:spring-data-commons"
        implementation "com.querydsl:querydsl-apt:4.3.1"
        implementation "com.querydsl:querydsl-jpa:4.3.1"
    }

QueryDSLWeb支持从1.11开始就在SpringDataCommons中提供从 https://www.baeldung.com/rest-api-search-querydsl-web-in-spring-data-jpa

在我的情况下,我必须实施 WebMvcConfigurer 再加上 WebMvcConfigurationSupport @启用WebMVC WebMvcConfigurationSupport with @Configuration . 我只是猜测WebMvcConfigurationSupport没有实现 init() of Predicate

@Configuration
//@EnableSpringDataWebSupport // <-- doesn't necessary for me
@EnableSwagger2
@EnableWebMvc // <-- add
public class SwaggerConfig implements WebMvcConfigurer { //<-- instead of 'WebMvcConfigurationSupport'
   ...
}

来自Spring文档的QueryDSL web支持

当在类路径上找到Querydsl时,该特性将随@EnableSpringDataWebSupport自动启用。 https://docs.spring.io/spring-data/jpa/docs/1.9.0.RELEASE/reference/html/#core.web.type-safe

控制器

    @GetMapping
    public List<InputMethodDto.Response> getInputMethodTypeList(
            @QuerydslPredicate(root = InputMethod.class) Predicate predicate) {
        return service.getInputMethodList(predicate);
    }

存储库

public interface InputMethodRepository extends JpaRepository<yourEntity, Long>, QuerydslPredicateExecutor<yourEntity>, QuerydslBinderCustomizer<QyourEntity> {
    @Override
    default void customize(final QuerydslBindings bindings, final QyourEntity root) {
        bindings.bind(String.class).first((StringPath path, String value)-> path.eq(value));
    }
}