【问题标题】：Spring Data Rest executes query but returns 500 internal Server ErrorSpring Data Rest 执行查询但返回 500 内部服务器错误
【发布时间】：2015-06-16 20:59:19
【问题描述】：

我正在使用 spring boot 和 spring data rest，我面临 500 内部服务器错误，但控制台中没有显示任何消息。

我有以下几点：

ProdutoVendaRepository.java

public interface ProdutoVendaRepository extends PagingAndSortingRepository<ProdutoVenda, Integer> {

@Query("SELECT new br.com.contoso.model.VendaPorFamilia(b.nome, SUM(i.valorMultiplicado)) FROM ProdutoVenda i JOIN i.produto o JOIN o.familia b WHERE b.nome LIKE 'foo' GROUP BY b.nome")
List <VendaPorFamilia> teste();
}

VendaPorFamilia.java

public class VendaPorFamilia {

private String nome;

private double valorTotal;

public VendaPorFamilia(String nome, double valorTotal) {
    this.nome = nome;
    this.valorTotal = valorTotal;
}

//getters and setters

ProdutoVenda.java

@Entity
@Immutable
@Table(name = "INV1")
public class ProdutoVenda {

@Id
@Column(name = "LineNum")
private int id;

@Column(name = "ItemCode")
private String codigo;

@Column(name = "Quantity")
private double quantidade;

@Column(name = "Price")
private double precoUnitario;

@Column(name = "LineTotal")
private double valorMultiplicado;

@Column(name = "Dscription")
private String descricao;

@OneToOne
@JoinColumn(name = "ItemCode", updatable = false, insertable = false)
private Produto produto;

//getters and setters

当我尝试时

curl -v  -X GET -H "X-AUTH-TOKEN: TokenFoo"  
http://localhost:8080/api/produtoVendas/search/teste

日志显示查询已执行：

2015-06-16 17:05:45.884 DEBUG 7892 --- [http-nio-8080-exec-1]         org.hibernate.SQL                        
: select familia2_.ItmsGrpNam as col_0_0_, sum(produtoven0_.LineTotal) as col_1_0_ from 
INV1 produtoven0_ inner join OITM produto1_ on produtoven0_.ItemCode=produto1_.ItemCode 
inner join OITB familia2_ on produto1_.ItmsGrpCod=familia2_.ItmsGrpCod where    
familia2_.ItmsGrpNam like 'foo' group by familia2_.ItmsGrpNam

但我收到一个：

< HTTP/1.1 500 Internal Server Error
* Server Apache-Coyote/1.1 is not blacklisted
< Server: Apache-Coyote/1.1
< Content-Length: 0
< Date: Tue, 16 Jun 2015 20:05:46 GMT
< Connection: close
< 
* Closing connection 0

我不知道该怎么做，我尝试了很多东西，但似乎没有任何效果。是的，当我在 MsSQL 服务器中执行完全相同的生成查询时，它会返回所需的值。所有其他存储库都可以正常工作...

感谢您的宝贵时间和帮助！

编辑：调试日志显示以下内容：

2015-06-17 15:25:58.670 DEBUG 8667 --- [http-nio-8080-exec-1] o.s.web.servlet.DispatcherServlet        : DispatcherServlet with name 'dispatcherServlet' processing GET request for [/api/produtoVendas/search/teste]
2015-06-17 15:25:58.674 DEBUG 8667 --- [http-nio-8080-exec-1] s.w.s.m.m.a.RequestMappingHandlerMapping : Looking up handler method for path /api/produtoVendas/search/teste
2015-06-17 15:25:58.678 DEBUG 8667 --- [http-nio-8080-exec-1] s.w.s.m.m.a.RequestMappingHandlerMapping : Did not find handler method for [/api/produtoVendas/search/teste]
2015-06-17 15:25:58.692 DEBUG 8667 --- [http-nio-8080-exec-1] o.s.web.servlet.DispatcherServlet        : Last-Modified value for [/api/produtoVendas/search/teste] is: -1
2015-06-17 15:25:58.758 DEBUG 8667 --- [http-nio-8080-exec-1] org.hibernate.SQL                        : select familia2_.ItmsGrpNam as col_0_0_, sum(produtoven0_.LineTotal) as col_1_0_ from INV1 produtoven0_ inner join OITM produto1_ on produtoven0_.ItemCode=produto1_.ItemCode inner join OITB familia2_ on produto1_.ItmsGrpCod=familia2_.ItmsGrpCod where familia2_.ItmsGrpNam like ‘foo’ group by familia2_.ItmsGrpNam
2015-06-17 15:25:58.836 DEBUG 8667 --- [http-nio-8080-exec-1] .m.m.a.ExceptionHandlerExceptionResolver : Resolving exception from handler [public org.springframework.http.ResponseEntity<java.lang.Object> org.springframework.data.rest.webmvc.RepositorySearchController.executeSearch(org.springframework.data.rest.webmvc.RootResourceInformation,org.springframework.web.context.request.WebRequest,java.lang.String,org.springframework.data.rest.webmvc.support.DefaultedPageable,org.springframework.data.domain.Sort,org.springframework.data.rest.webmvc.PersistentEntityResourceAssembler)]: java.lang.IllegalArgumentException: PersistentEntity must not be null!
2015-06-17 15:25:58.839 DEBUG 8667 --- [http-nio-8080-exec-1] .m.m.a.ExceptionHandlerExceptionResolver : Invoking @ExceptionHandler method: org.springframework.http.ResponseEntity<org.springframework.data.rest.webmvc.support.ExceptionMessage> org.springframework.data.rest.webmvc.RepositoryRestExceptionHandler.handleMiscFailures(java.lang.Exception)
2015-06-17 15:25:58.856 DEBUG 8667 --- [http-nio-8080-exec-1] o.s.web.servlet.DispatcherServlet        : Null ModelAndView returned to DispatcherServlet with name 'dispatcherServlet': assuming HandlerAdapter completed request handling
2015-06-17 15:25:58.857 DEBUG 8667 --- [http-nio-8080-exec-1] o.s.web.servlet.DispatcherServlet        : Successfully completed request

【问题讨论】：

标签： java spring rest spring-boot spring-data-rest

【解决方案1】：

在与数据库建立连接的那一行放置一个调试器。

【讨论】：

嘿，谢谢！我设法记录了一些调试级别并使用新信息编辑了我的问题，有什么想法吗？
我对此并不完全确定，但是已经定义了存储库，扩展了 PagingAndSortingRepository 并期望查询的结果是除 ProdutoVenda 之外的其他类，我不认为它是允许的。
其实你可以，@SalvadorJuanMartinez，详情请看我的回答

【解决方案2】：

哼... 这很奇怪，但我发现了这个 question 并添加了一个控制器来调用该方法，它就像一个魅力......

Obv 这不是一个修复方法，但它是一个很好的解决方法...

编辑：错误发生是因为它需要一个实体，所以我所要做的就是用 @Entity 注释 VendaPorFamilia。

【讨论】：

想想还是有道理的，因为Spring Data Rest（JPA）依赖于Hibernate，而Hibernate是一个ORM（Object Relational Mapping），实体是hibernate处理的对象。所以用@Entity注释一个类是“告诉”Hibernate的“方式”，嘿，你有这个类可用于你的操作。