Spring Boot JPA java.lang.IndexOutOfBoundsException：索引：1，大小：1 在 java.util.ArrayList.rangeCheck

Question

JPA 存储库具有以下方法，该方法以前运行良好，但现在抛出一个奇怪的错误。 jpa 定义为：

@Repository
public interface UserGroupRepository extends JpaRepository<UserGroup, Long> {
...

方法如下：

    String USER_GROUP_SUMMARY = "SELECT b.name, b.id, count(u.user_id) as total_user,\n" +
            "           sum(case u.is_active when true then 1 else 0 end) as active_user\n" +
            "           FROM user_group b\n" +
            "                      LEFT JOIN user u\n" +
            "                         ON u.group_id = b.id\n" +
            "                      GROUP BY b.name, b.id\n" +
            "                      order by b.name ASC;";
    @Query(value = USER_GROUP_SUMMARY, nativeQuery = true)
    List<Map<String,Object>> getAllGroupSummary();

然而，查询返回以下结果：

pom.xml 的摘要

    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.1.6.RELEASE</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>

    <properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
        <java.version>1.8</java.version>
        <freemarker.version>2.3.28</freemarker.version>
        <spring.boot.version>2.1.6.RELEASE</spring.boot.version>
    </properties>
...

现在它抛出错误堆栈跟踪如下：

2020-03-06 19:14:13.720 ERROR 2892 --- [nio-8080-exec-2] o.a.c.c.C.[.[.[/].[dispatcherServlet]    : Servlet.service() for servlet [dispatcherServlet] in context with path [] threw exception [Request processing failed; nested exception is java.lang.IndexOutOfBoundsException: Index: 1, Size: 1] with root cause

java.lang.IndexOutOfBoundsException: Index: 1, Size: 1
    at java.util.ArrayList.rangeCheck(ArrayList.java:657) ~[na:1.8.0_181]
    at java.util.ArrayList.get(ArrayList.java:433) ~[na:1.8.0_181]
    at org.springframework.data.repository.query.ResultProcessor$ProjectingConverter.toMap(ResultProcessor.java:315) ~[spring-data-commons-2.1.9.RELEASE.jar:2.1.9.RELEASE]
    at org.springframework.data.repository.query.ResultProcessor$ProjectingConverter.getProjectionTarget(ResultProcessor.java:303) ~[spring-data-commons-2.1.9.RELEASE.jar:2.1.9.RELEASE]
    at org.springframework.data.repository.query.ResultProcessor$ProjectingConverter.convert(ResultProcessor.java:290) ~[spring-data-commons-2.1.9.RELEASE.jar:2.1.9.RELEASE]
    at org.springframework.data.repository.query.ResultProcessor$ChainingConverter.lambda$and$0(ResultProcessor.java:213) ~[spring-data-commons-2.1.9.RELEASE.jar:2.1.9.RELEASE]
    at org.springframework.data.repository.query.ResultProcessor$ChainingConverter.convert(ResultProcessor.java:224) ~[spring-data-commons-2.1.9.RELEASE.jar:2.1.9.RELEASE]
    at org.springframework.data.repository.query.ResultProcessor.processResult(ResultProcessor.java:152) ~[spring-data-commons-2.1.9.RELEASE.jar:2.1.9.RELEASE]
    at org.springframework.data.jpa.repository.query.AbstractJpaQuery.doExecute(AbstractJpaQuery.java:141) ~[spring-data-jpa-2.1.9.RELEASE.jar:2.1.9.RELEASE]
    at org.springframework.data.jpa.repository.query.AbstractJpaQuery.execute(AbstractJpaQuery.java:125) ~[spring-data-jpa-2.1.9.RELEASE.jar:2.1.9.RELEASE]
    at org.springframework.data.repository.core.support.RepositoryFactorySupport$QueryExecutorMethodInterceptor.doInvoke(RepositoryFactorySupport.java:605) ~[spring-data-commons-2.1.9.RELEASE.jar:2.1.9.RELEASE]
    at org.springframework.data.repository.core.support.RepositoryFactorySupport$QueryExecutorMethodInterceptor.lambda$invoke$3(RepositoryFactorySupport.java:595) ~[spring-data-commons-2.1.9.RELEASE.jar:2.1.9.RELEASE]
    at org.springframework.data.repository.core.support.RepositoryFactorySupport$QueryExecutorMethodInterceptor.invoke(RepositoryFactorySupport.java:595) ~[spring-data-commons-2.1.9.RELEASE.jar:2.1.9.RELEASE]
    at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:186) ~[spring-aop-5.1.8.RELEASE.jar:5.1.8.RELEASE]
    at org.springframework.data.projection.DefaultMethodInvokingMethodInterceptor.invoke(DefaultMethodInvokingMethodInterceptor.java:59) ~[spring-data-commons-2.1.9.RELEASE.jar:2.1.9.RELEASE]
    at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:186) ~[spring-aop-5.1.8.RELEASE.jar:5.1.8.RELEASE]
    at org.springframework.transaction.interceptor.TransactionAspectSupport.invokeWithinTransaction(TransactionAspectSupport.java:295) ~[spring-tx-5.1.8.RELEASE.jar:5.1.8.RELEASE]
    at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:98) ~[spring-tx-5.1.8.RELEASE.jar:5.1.8.RELEASE]
    at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:186) ~[spring-aop-5.1.8.RELEASE.jar:5.1.8.RELEASE]
    at org.springframework.dao.support.PersistenceExceptionTranslationInterceptor.invoke(PersistenceExceptionTranslationInterceptor.java:139) ~[spring-tx-5.1.8.RELEASE.jar:5.1.8.RELEASE]
    at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:186) ~[spring-aop-5.1.8.RELEASE.jar:5.1.8.RELEASE]
    at org.springframework.data.jpa.repository.support.CrudMethodMetadataPostProcessor$CrudMethodMetadataPopulatingMethodInterceptor.invoke(CrudMethodMetadataPostProcessor.java:138) ~[spring-data-jpa-2.1.9.RELEASE.jar:2.1.9.RELEASE]
    at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:186) ~[spring-aop-5.1.8.RELEASE.jar:5.1.8.RELEASE]
    at org.springframework.aop.interceptor.ExposeInvocationInterceptor.invoke(ExposeInvocationInterceptor.java:93) ~[spring-aop-5.1.8.RELEASE.jar:5.1.8.RELEASE]
    at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:186) ~[spring-aop-5.1.8.RELEASE.jar:5.1.8.RELEASE]
    at org.springframework.data.repository.core.support.SurroundingTransactionDetectorMethodInterceptor.invoke(SurroundingTransactionDetectorMethodInterceptor.java:61) ~[spring-data-commons-2.1.9.RELEASE.jar:2.1.9.RELEASE]
    at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:186) ~[spring-aop-5.1.8.RELEASE.jar:5.1.8.RELEASE]
    at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:212) ~[spring-aop-5.1.8.RELEASE.jar:5.1.8.RELEASE]
    at com.sun.proxy.$Proxy193.getAllGroupSummary(Unknown Source) ~[na:na]
    at com.telus.msmb.services.impl.UserGroupServiceImpl.

Answer 1

它将返回一个 UserGroup 列表，而不是 String 和 object 的 MAP。 您应该更改返回对象。 获得列表后，您可以处理列表以使用 lambda 或通过迭代来更改为映射。