4

我正在尝试使用 findFirstBy 和 findTopBy 获取集合中的最新记录，但它不适用于 Spring Data Elasticsearch 并抛出 NullPointerException。

我的存储库方法如下 -

@Repository
public interface MyRepository extends ElasticsearchRepository<PointInTime, String> {
     PointInTime findFirstByDbInstanceIdOrderByCreationTimeDesc(String dbInstanceId);
}

例外是 -

java.lang.NullPointerException
        at org.springframework.data.elasticsearch.core.ElasticsearchTemplate.queryForPage(ElasticsearchTemplate.java:289)
        at org.springframework.data.elasticsearch.core.ElasticsearchTemplate.queryForObject(ElasticsearchTemplate.java:233)
        at org.springframework.data.elasticsearch.repository.query.ElasticsearchPartQuery.execute(ElasticsearchPartQuery.java:59)
        at org.springframework.data.repository.core.support.RepositoryFactorySupport$QueryExecutorMethodInterceptor.doInvoke(RepositoryFactorySupport.java:421)
        at org.springframework.data.repository.core.support.RepositoryFactorySupport$QueryExecutorMethodInterceptor.invoke(RepositoryFactorySupport.java:381)
        at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179)
        at org.springframework.data.repository.core.support.RepositoryFactorySupport$DefaultMethodInvokingMethodInterceptor.invoke(RepositoryFactorySupport.java:512)
        at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179)
        at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:207)
        at com.sun.proxy.$Proxy66.findFirstByOrderByCreationTimeDesc(Unknown Source)
        at com.comp.prod.assetmanagement.service.PointInTimeService.getLatestPointInTime(PointInTimeService.java:103)
        at com.comp.prod.assetmanagement.controller.PointInTimeController.getPointInTimes(PointInTimeController.java:135)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
        at java.lang.reflect.Method.invoke(Unknown Source)
        at org.springframework.web.method.support.InvocableHandlerMethod.invoke(InvocableHandlerMethod.java:215)
        at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:132)
        at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:110)
        at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandleMethod(RequestMappingHandlerAdapter.java:781)
        at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:721)
        at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:83)
        at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:943)
        at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:877)
        at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:966)
        at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:857)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:618)
        at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:842)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:725)
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:301)
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
        at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:239)
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
        at com.comp.prod.common.filter.CloudCORSFilter.doFilter(CloudCORSFilter.java:79)
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:239)
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
        at org.springframework.security.web.FilterChainProxy.doFilterInternal(FilterChainProxy.java:186)
        at org.springframework.security.web.FilterChainProxy.doFilter(FilterChainProxy.java:160)
        at org.springframework.web.filter.DelegatingFilterProxy.invokeDelegate(DelegatingFilterProxy.java:344)
        at org.springframework.web.filter.DelegatingFilterProxy.doFilter(DelegatingFilterProxy.java:261)
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:239)
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
        at org.apache.logging.log4j.core.web.Log4jServletFilter.doFilter(Log4jServletFilter.java:66)
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:239)
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
        at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:219)
        at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:106)
        at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:503)
        at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:136)
        at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:74)
        at org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:610)
        at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:88)
        at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:516)
        at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1015)
        at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:652)
        at org.apache.coyote.http11.Http11NioProtocol$Http11ConnectionHandler.process(Http11NioProtocol.java:222)
        at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1575)
        at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.run(NioEndpoint.java:1533)
        at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
        at java.lang.Thread.run(Unknown Source)
4

3 回答 3

4

这是一个老话题，但我现在有同样的问题。

似乎没有实现 First 和 Top 关键字，至少在当前版本的 Elasticsearch Spring Data (1.2.2.RELEASE) 中是这样。

最好的选择是使用 Pageable 并new PageItem(0, 1)作为参数传递。

于 2015-08-14T08:27:38.290 回答
0

你也可以试试这个解决方案，

PointInTime pointInTime = null;

if (myRepository.findAllByDbInstanceIdOrderByCreationTimeDesc(dbInstanceId) != null 
    && !myRepository.findAllByDbInstanceIdOrderByCreationTimeDesc(dbInstanceId).isEmpty()) {
   
pointInTime = myRepository.findAllByDbInstanceIdOrderByCreationTimeDesc(dbInstanceId).get(0);

}

假设 myRepository 是 MyRepository 接口的自动装配对象。

于 2020-12-05T06:18:50.880 回答
-2

在 Spring data 中我们可以检索 top 记录，让我们试试这个方法 

findTop1ByOrderByClientRoleIdAsc()

ClientRoleId是列名

于 2017-12-21T11:33:08.447 回答