java - 找不到类型 Material 的属性 getMaterials!和创建名称为 'materialRepository' : 的 bean 时出错

Question

我遇到了很多错误，老实说我不明白。首先，我使用 JHipster 创建了这个应用程序。非常有用的开源技术，但它做了一些我不熟悉的事情。

我只是想通过 JPA 将值插入数据库。

/**
 * Spring Data JPA repository for the Material entity.
 */
public interface MaterialRepository extends JpaRepository<Material,Long> {

     public void uploadMaterialData(String material_number, BigDecimal material_thickness,String material_size,BigDecimal lb_per_sheet,BigDecimal dollar_per_lb);

     List<Material> getMaterials(BigDecimal material_number);

}

一小块 MaterialResource.java 但是它有 .save

if (cit.hasNext()) {
                cell = cit.next();
                cell.setCellType(Cell.CELL_TYPE_STRING);
                String dollar_per_lb = cell.getStringCellValue();
                Double perLb_as_double = Double.parseDouble(dollar_per_lb);
                //now the conversion into big decimal happens
                BigDecimal dollar_per_lb_as_BigDecimal = new  
                BigDecimal(perLb_as_double,MathContext.DECIMAL64);
                this.dollar_per_lb = dollar_per_lb_as_BigDecimal;
                material.setDollar_per_lb(dollar_per_lb_as_BigDecimal);
            }

            Long materialValue =  
            Long.parseLong(material.getMaterial_number());

            //puts materials into map and the key is the material number
            materialMap.put(materialValue, material);

            materialRepository.save(material);
        }

        workbook.close();

Material .java

public class Material implements Serializable {

/**
 * 
 */
private static final long serialVersionUID = 1L;

@Id
@GeneratedValue(strategy = GenerationType.AUTO)

private Long id;

@Column(name = "material_number")
private String material_number;

@Column(name = "material_thickness", precision=10, scale=2)
private BigDecimal material_thickness;

@Column(name = "material_size")
private String material_size;

@Column(name = "lb_per_sheet", precision=10, scale=2)
private BigDecimal lb_per_sheet;

@Column(name = "dollar_per_lb", precision=10, scale=2)
private BigDecimal dollar_per_lb;

@Column(name = "inventory_count")
private Integer inventory_count;

....getter and setter methods below

应用WebXml.java

/**
 * This is a helper Java class that provides an alternative to creating a   
web.xml.
*/
public class ApplicationWebXml extends SpringBootServletInitializer {

private final Logger log = LoggerFactory.getLogger(ApplicationWebXml.class);

@Override
protected SpringApplicationBuilder configure(SpringApplicationBuilder application) {
    return application.profiles(addDefaultProfile())
            .showBanner(false)
            .sources(Application.class);
}

/**
 * Set a default profile if it has not been set.
 * <p/>
 * <p>
 * Please use -Dspring.profiles.active=dev
 * </p>
 */
private String addDefaultProfile() {
    String profile = System.getProperty("spring.profiles.active");
    if (profile != null) {
        log.info("Running with Spring profile(s) : {}", profile);
        return profile;
    }

    log.warn("No Spring profile configured, running with default    
configuration");
    return Constants.SPRING_PROFILE_DEVELOPMENT;
}
}

应用程序.java

@ComponentScan@EnableAutoConfiguration(排除 = {MetricFilterAutoConfiguration.class，MetricRepositoryAutoConfiguration.class})公开课申请{

private static final Logger log = LoggerFactory.getLogger(Application.class);

@Inject
private Environment env;

/**
 * Initializes hillcrestToolDie.
 * <p/>
 * Spring profiles can be configured with a program arguments --spring.profiles.active=your-active-profile
 * <p/>
 */
@PostConstruct
public void initApplication() throws IOException {
    if (env.getActiveProfiles().length == 0) {
        log.warn("No Spring profile configured, running with default configuration");
    } else {
        log.info("Running with Spring profile(s) : {}", Arrays.toString(env.getActiveProfiles()));
    }
}

    /**
     * Main method, used to run the application.
     */
    public static void main(String[] args) throws UnknownHostException {
        SpringApplication app = new SpringApplication(Application.class);
        app.setShowBanner(false);

        SimpleCommandLinePropertySource source = new SimpleCommandLinePropertySource(args);

        // Check if the selected profile has been set as argument.
        // if not the development profile will be added
        addDefaultProfile(app, source);
        addLiquibaseScanPackages();
        Environment env = app.run(args).getEnvironment();
        log.info("Access URLs:\n----------------------------------------------------------\n\t" +
            "Local: \t\thttp://127.0.0.1:{}\n\t" +
            "External: \thttp://{}:{}\n----------------------------------------------------------",
            env.getProperty("server.port"),
            InetAddress.getLocalHost().getHostAddress(),
            env.getProperty("server.port"));

    }

    /**
     * Set a default profile if it has not been set
     */
    private static void addDefaultProfile(SpringApplication app, SimpleCommandLinePropertySource source) {
        if (!source.containsProperty("spring.profiles.active")) {
            app.setAdditionalProfiles(Constants.SPRING_PROFILE_DEVELOPMENT);
        }
    }

    /**
     * Set the liquibases.scan.packages to avoid an exception from ServiceLocator.
     */
    private static void addLiquibaseScanPackages() {
        System.setProperty("liquibase.scan.packages", Joiner.on(",").join(
            "liquibase.change", "liquibase.database", "liquibase.parser",
            "liquibase.precondition", "liquibase.datatype",
            "liquibase.serializer", "liquibase.sqlgenerator", "liquibase.executor",
            "liquibase.snapshot", "liquibase.logging", "liquibase.diff",
            "liquibase.structure", "liquibase.structurecompare", "liquibase.lockservice",
            "liquibase.ext", "liquibase.changelog"));
    }
}

错误:

Exception in thread "main" org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'materialResource': Injection of autowired dependencies failed; nested exception is org.springframework.beans.factory.BeanCreationException: Could not autowire field: private com.htd.repository.MaterialRepository com.htd.web.rest.MaterialResource.materialRepository; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'materialRepository': Invocation of init method failed; nested exception is org.springframework.data.mapping.PropertyReferenceException: No property getMaterials found for type Material!
    at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessPropertyValues(AutowiredAnnotationBeanPostProcessor.java:334)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1210)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:537)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:476)
    at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:303)
    at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:230)
    at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:299)
    at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:194)
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:755)
    at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:757)
    at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:480)
    at org.springframework.boot.context.embedded.EmbeddedWebApplicationContext.refresh(EmbeddedWebApplicationContext.java:118)
    at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:686)
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:320)
    at com.htd.Application.main(Application.java:59)
Caused by: org.springframework.beans.factory.BeanCreationException: Could not autowire field: private com.htd.repository.MaterialRepository com.htd.web.rest.MaterialResource.materialRepository; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'materialRepository': Invocation of init method failed; nested exception is org.springframework.data.mapping.PropertyReferenceException: No property getMaterials found for type Material!
    at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:561)
    at org.springframework.beans.factory.annotation.InjectionMetadata.inject(InjectionMetadata.java:88)
    at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessPropertyValues(AutowiredAnnotationBeanPostProcessor.java:331)
    ... 14 more
Caused by: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'materialRepository': Invocation of init method failed; nested exception is org.springframework.data.mapping.PropertyReferenceException: No property getMaterials found for type Material!
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1574)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:539)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:476)
    at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:303)
    at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:230)
    at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:299)
    at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:194)
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.findAutowireCandidates(DefaultListableBeanFactory.java:1120)
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.doResolveDependency(DefaultListableBeanFactory.java:1044)
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveDependency(DefaultListableBeanFactory.java:942)
    at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:533)
    ... 16 more
Caused by: org.springframework.data.mapping.PropertyReferenceException: No property getMaterials found for type Material!
    at org.springframework.data.mapping.PropertyPath.<init>(PropertyPath.java:75)
    at org.springframework.data.mapping.PropertyPath.create(PropertyPath.java:327)
    at org.springframework.data.mapping.PropertyPath.create(PropertyPath.java:307)
    at org.springframework.data.mapping.PropertyPath.from(PropertyPath.java:270)
    at org.springframework.data.mapping.PropertyPath.from(PropertyPath.java:241)
    at org.springframework.data.repository.query.parser.Part.<init>(Part.java:76)
    at org.springframework.data.repository.query.parser.PartTree$OrPart.<init>(PartTree.java:235)
    at org.springframework.data.repository.query.parser.PartTree$Predicate.buildTree(PartTree.java:373)
    at org.springframework.data.repository.query.parser.PartTree$Predicate.<init>(PartTree.java:353)
    at org.springframework.data.repository.query.parser.PartTree.<init>(PartTree.java:84)
    at org.springframework.data.jpa.repository.query.PartTreeJpaQuery.<init>(PartTreeJpaQuery.java:61)
    at org.springframework.data.jpa.repository.query.JpaQueryLookupStrategy$CreateQueryLookupStrategy.resolveQuery(JpaQueryLookupStrategy.java:94)
    at org.springframework.data.jpa.repository.query.JpaQueryLookupStrategy$CreateIfNotFoundQueryLookupStrategy.resolveQuery(JpaQueryLookupStrategy.java:205)
    at org.springframework.data.jpa.repository.query.JpaQueryLookupStrategy$AbstractQueryLookupStrategy.resolveQuery(JpaQueryLookupStrategy.java:72)
    at org.springframework.data.repository.core.support.RepositoryFactorySupport$QueryExecutorMethodInterceptor.<init>(RepositoryFactorySupport.java:349)
    at org.springframework.data.repository.core.support.RepositoryFactorySupport.getRepository(RepositoryFactorySupport.java:187)
    at org.springframework.data.repository.core.support.RepositoryFactoryBeanSupport.initAndReturn(RepositoryFactoryBeanSupport.java:239)
    at org.springframework.data.repository.core.support.RepositoryFactoryBeanSupport.afterPropertiesSet(RepositoryFactoryBeanSupport.java:225)
    at org.springframework.data.jpa.repository.support.JpaRepositoryFactoryBean.afterPropertiesSet(JpaRepositoryFactoryBean.java:92)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.invokeInitMethods(AbstractAutowireCapableBeanFactory.java:1633)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1570)
    ... 26 more

Answer 1

Spring 数据拥有一种基于方法名称解析查询的机制，来自 docs

The query builder mechanism built into Spring Data repositoryinfrastructure is useful for building constraining queries overentities of the repository. The mechanism strips the prefixes find…By,read…By, query…By, count…By, and get…

所以当get从你的 List<Material> getMaterials(BigDecimal material_number); 中删除它尝试搜索名为 materials 的属性针对 Material实体。

看起来，您不想自动解析该特定方法的查询，因此您可以简单地更改名称，这样查询派生机制就不会启动，例如List<Material> retrieveMaterials(BigDecimal material_number);