验证方法公共抽象java.util.List的查询失败

Z时代
2024-01-10
分类：问答

我有一个基本的SpringBoot应用程序。使用Spring

Initializer，JPA，嵌入式Tomcat，Thymeleaf模板引擎并将其打包为可执行JAR文件。SpringBoot的版本是2.0.1.RELEASE。我已经使用此方法创建了一个从CrudRepository扩展的类存储库

@Query("select us.priceAlertsTapas.tapa from User us left join us.priceAlertsTapas  pat left join pat.tapa tapa where pat.priceAlert = ?1")
    List<Tapa> tapasByUserPriceAlert (PriceAlert pa);

但是当我初始化项目时，我得到了这个错误：

Validation failed for query for method public abstract java.util.List at org.springframework.data.jpa.repository.query.SimpleJpaQuery.validateQuery(SimpleJpaQuery.java:93) at org.springframework.data.jpa.repository.query.SimpleJpaQuery.<init>(SimpleJpaQuery.java:63) at org.springframework.data.jpa.repository.query.JpaQueryFactory.fromMethodWithQueryString(JpaQueryFactory.java:76) at org.springframework.data.jpa.repository.query.JpaQueryFactory.fromQueryAnnotation(JpaQueryFactory.java:56) at org.springframework.data.jpa.repository.query.JpaQueryLookupStrategy$DeclaredQueryLookupStrategy.resolveQuery(JpaQueryLookupStrategy.java:139) at org.springframework.data.jpa.repository.query.JpaQueryLookupStrategy$CreateIfNotFoundQueryLookupStrategy.resolveQuery(JpaQueryLookupStrategy.java:206) at org.springframework.data.jpa.repository.query.JpaQueryLookupStrategy$AbstractQueryLookupStrategy.resolveQuery(JpaQueryLookupStrategy.java:79) at org.springframework.data.repository.core.support.RepositoryFactorySupport$QueryExecutorMethodInterceptor.lookupQuery(RepositoryFactorySupport.java:553) at org.springframework.data.repository.core.support.RepositoryFactorySupport$QueryExecutorMethodInterceptor.lambda$mapMethodsToQuery$1(RepositoryFactorySupport.java:546) at java.util.stream.ReferencePipeline$3$1.accept(ReferencePipeline.java:193) at java.util.Iterator.forEachRemaining(Iterator.java:116) at java.util.Collections$UnmodifiableCollection$1.forEachRemaining(Collections.java:1049) at java.util.Spliterators$IteratorSpliterator.forEachRemaining(Spliterators.java:1801) at java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:481) at java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:471) at java.util.stream.ReduceOps$ReduceOp.evaluateSequential(ReduceOps.java:708) at java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234) at java.util.stream.ReferencePipeline.collect(ReferencePipeline.java:499) at org.springframework.data.repository.core.support.RepositoryFactorySupport$QueryExecutorMethodInterceptor.mapMethodsToQuery(RepositoryFactorySupport.java:548) at org.springframework.data.repository.core.support.RepositoryFactorySupport$QueryExecutorMethodInterceptor.lambda$new$0(RepositoryFactorySupport.java:538) at java.util.Optional.map(Optional.java:215) at org.springframework.data.repository.core.support.RepositoryFactorySupport$QueryExecutorMethodInterceptor.<init>(RepositoryFactorySupport.java:538) at org.springframework.data.repository.core.support.RepositoryFactorySupport.getRepository(RepositoryFactorySupport.java:317) at org.springframework.data.repository.core.support.RepositoryFactoryBeanSupport.lambda$afterPropertiesSet$3(RepositoryFactoryBeanSupport.java:287) at org.springframework.data.util.Lazy.getNullable(Lazy.java:141) at org.springframework.data.util.Lazy.get(Lazy.java:63) at org.springframework.data.repository.core.support.RepositoryFactoryBeanSupport.afterPropertiesSet(RepositoryFactoryBeanSupport.java:290) at org.springframework.data.jpa.repository.support.JpaRepositoryFactoryBean.afterPropertiesSet(JpaRepositoryFactoryBean.java:102) at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.invokeInitMethods(AbstractAutowireCapableBeanFactory.java:1761) at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1698) ... 47 common frames omitted Caused by: java.lang.NullPointerException: null at org.hibernate.hql.internal.ast.HqlSqlWalker.createFromJoinElement(HqlSqlWalker.java:424) at org.hibernate.hql.internal.antlr.HqlSqlBaseWalker.joinElement(HqlSqlBaseWalker.java:3931) at org.hibernate.hql.internal.antlr.HqlSqlBaseWalker.fromElement(HqlSqlBaseWalker.java:3717) at org.hibernate.hql.internal.antlr.HqlSqlBaseWalker.fromElementList(HqlSqlBaseWalker.java:3595) at org.hibernate.hql.internal.antlr.HqlSqlBaseWalker.fromClause(HqlSqlBaseWalker.java:720) at org.hibernate.hql.internal.antlr.HqlSqlBaseWalker.query(HqlSqlBaseWalker.java:576) at org.hibernate.hql.internal.antlr.HqlSqlBaseWalker.selectStatement(HqlSqlBaseWalker.java:313) at org.hibernate.hql.internal.antlr.HqlSqlBaseWalker.statement(HqlSqlBaseWalker.java:261) at org.hibernate.hql.internal.ast.QueryTranslatorImpl.analyze(QueryTranslatorImpl.java:266) at org.hibernate.hql.internal.ast.QueryTranslatorImpl.doCompile(QueryTranslatorImpl.java:189) at org.hibernate.hql.internal.ast.QueryTranslatorImpl.compile(QueryTranslatorImpl.java:141) at org.hibernate.engine.query.spi.HQLQueryPlan.<init>(HQLQueryPlan.java:115) at org.hibernate.engine.query.spi.HQLQueryPlan.<init>(HQLQueryPlan.java:77) at org.hibernate.engine.query.spi.QueryPlanCache.getHQLQueryPlan(QueryPlanCache.java:153) at org.hibernate.internal.AbstractSharedSessionContract.getQueryPlan(AbstractSharedSessionContract.java:553) at org.hibernate.internal.AbstractSharedSessionContract.createQuery(AbstractSharedSessionContract.java:662) at org.hibernate.internal.AbstractSessionImpl.createQuery(AbstractSessionImpl.java:23) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:498) at org.springframework.orm.jpa.ExtendedEntityManagerCreator$ExtendedEntityManagerInvocationHandler.invoke(ExtendedEntityManagerCreator.java:350) at com.sun.proxy.$Proxy105.createQuery(Unknown Source) at org.springframework.data.jpa.repository.query.SimpleJpaQuery.validateQuery(SimpleJpaQuery.java:87) ... 76 common frames omitted

通过提出的解决方案，我遇到了相同的错误

与此查询，我也有相同的错误（？！？）

 @Query("select us.priceAlertsTapas.tapa from User us ")

这里的User对象：

@Entity
@Table(name="t_user")
public class User implements Serializable, UserDetails {
...
@ManyToMany
    @JoinTable(
        name="t_user_price_alert_tapa",
        joinColumns=@JoinColumn(name="user_id", referencedColumnName="id"),
        inverseJoinColumns=@JoinColumn(name="price_alert_tapa_id", referencedColumnName="id"))
    private Set<PriceAlertTapa> priceAlertsTapas = new HashSet<>();
}

和

@Entity
@Table(name="t_price_alert")
public class PriceAlert implements Serializable {
    /**
     * 
     */
    private static final long serialVersionUID = 1L;
    public PriceAlert(int id) {
        super();
        this.id = id;
    }
    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private Integer id;
    private String name;
...
    }

和

@Entity
@Table(name="t_price_alert_tapa")
public class PriceAlertTapa  implements Serializable {
    /**
     * 
     */
    private static final long serialVersionUID = 1L;
    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private long id;
    public PriceAlertTapa(PriceAlert priceAlert, Tapa tapa) {
        super();
        this.tapa = tapa;
        this.priceAlert = priceAlert;
    }
    private Tapa tapa;
    private PriceAlert priceAlert;
..
}

回答：

由于priceAlertsTapas已设置，因此您不能使用点路径。

@Query("select us.priceAlertsTapas.tapa from User us")

首先你需要加入

@Query("select pat.tapa from User us join us.priceAlertsTapas pat")

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验证方法公共抽象java.util.List的查询失败

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