我正在使用 Spring-Data-Jpa 创建我的存储库接口。在使用 @query 注释指定显式查询时,我看到空指针异常。仅当我在查询中有多个命名参数并且仅当我使用命名参数时才会发生这种情况。
public interface DeviceStatusRepository extends JpaRepository<DeviceStatus, Long>, JpaSpecificationExecutor<DeviceStatus> {
@Query(value = "SELECT ds from DeviceStatus ds where ds.deviceId like :deviceId and ds.chargingStatus like :chargingStatus")
Page<DeviceStatus> searchByMultipleFields(@Param("deviceId") String deviceId, @Param("chargingStatus") String chargingStatus, Pageable p);
}
以下是空指针异常:
Caused by: java.lang.NullPointerException
at org.springframework.data.jpa.repository.query.StringQuery.checkAndRegister(StringQuery.java:175)
at org.springframework.data.jpa.repository.query.StringQuery.parseLikeBindings(StringQuery.java:162)
at org.springframework.data.jpa.repository.query.StringQuery.<init>(StringQuery.java:68)
at org.springframework.data.jpa.repository.query.SimpleJpaQuery.<init>(SimpleJpaQuery.java:53)
at org.springframework.data.jpa.repository.query.SimpleJpaQuery.fromQueryAnnotation(SimpleJpaQuery.java:167)
at org.springframework.data.jpa.repository.query.JpaQueryLookupStrategy$DeclaredQueryLookupStrategy.resolveQuery(JpaQueryLookupStrategy.java:114)
at org.springframework.data.jpa.repository.query.JpaQueryLookupStrategy$CreateIfNotFoundQueryLookupStrategy.resolveQuery(JpaQueryLookupStrategy.java:160)
at org.springframework.data.jpa.repository.query.JpaQueryLookupStrategy$AbstractQueryLookupStrategy.resolveQuery(JpaQueryLookupStrategy.java:68)
at org.springframework.data.repository.core.support.RepositoryFactorySupport$QueryExecutorMethodInterceptor.<init>(RepositoryFactorySupport.java:279)
at org.springframework.data.repository.core.support.RepositoryFactorySupport.getRepository(RepositoryFactorySupport.java:147)
at org.springframework.data.repository.core.support.RepositoryFactoryBeanSupport.getObject(RepositoryFactoryBeanSupport.java:153)
at org.springframework.data.repository.core.support.RepositoryFactoryBeanSupport.getObject(RepositoryFactoryBeanSupport.java:43)
at org.springframework.beans.factory.support.FactoryBeanRegistrySupport.doGetObjectFromFactoryBean(FactoryBeanRegistrySupport.java:142)
... 36 more
我确实查找了 Spring-Data 的StringQuery.java,甚至放置了一个调试点来了解导致 NPE 的原因。我注意到bindings
只有关于deviceStatus
(我的查询中的第一个命名参数)的条目,并且当它正在查找(我的查询中的第二个命名参数)的条目时,它按原样chargingStatus
提供 NPE (我猜位置应该为空命名参数)。看起来像一个错误,因为它没有正确处理空参数。existing.hasPosition(binding.position)
position
private final void checkAndRegister(LikeBinding binding) {
for (LikeBinding existing : bindings) {
if (existing.hasName(binding.name) || existing.hasPosition(binding.position)) {
Assert.isTrue(existing.equals(binding), String.format(MESSAGE, existing, binding));
}
}
this.bindings.add(binding);
}
我使用的 Spring-Data-Version 是 1.4.0.M1
<dependency>
<groupId>org.springframework.data</groupId>
<artifactId>spring-data-jpa</artifactId>
<version>1.4.0.M1</version>
</dependency>
请注意,如果我使用位置参数 (?1, ?2) 而不是命名参数 (:deviceId, :chargingStatus),查询工作正常。
其他人看到这个问题吗?