Spring Data Rest executes query but returns 500 internal Server Error

Question

I am using spring boot and spring data rest and I am facing a 500 internal server error, but no messages are displayed in console.

I have the following:

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

When I try to

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

The log shows that the query was executed:

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

But I receive a:

< 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

I don´t know what to do, I´ve tried a lot of things but nothing seems to work. And Yes, when I execute the exact same generated query in MsSQL server, it returns the wanted value. All other repositories work without problems...

Thanks for your time and help!

EDIT: The debug log shows the folllowing:

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

Answer 1

Hum... This is strange but I found this question and added a controller to call the method and it worked like a charm...

Obv this is not a fix, but it is a good workaround...

EDIT: The error happens because it is expecting an entity, so all I had to do was annotate VendaPorFamilia with @Entity.

Answer 2

Put a debugger on the line where connection is established with the database.