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java - jhipster LazyInitializationException

转载 作者:行者123 更新时间:2023-12-02 13:27:20 32 4
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嗨,我有使用 jhipster 4.2.0 的微服务应用程序这是我的资源类

import org.springframework.web.bind.annotation.*;

import javax.validation.Valid;
import java.net.URI;
import java.net.URISyntaxException;
import java.util.List;
import java.util.Optional;

/**
* REST controller for managing Medida.
*/
@RestController
@RequestMapping("/api")
public class MedidaResource {

private final Logger log = LoggerFactory.getLogger(MedidaResource.class);

private static final String ENTITY_NAME = "medida";

private final MedidaRepository medidaRepository;
private final ClienteRepository clienteRepository;

public MedidaResource(MedidaRepository medidaRepository, ClienteRepository clienteRepository) {
this.medidaRepository = medidaRepository;
this.clienteRepository = clienteRepository;
}

/**
* POST /medidas : Create a new medida.
*
* @param medida the medida to create
* @return the ResponseEntity with status 201 (Created) and with body the new medida, or with status 400 (Bad Request) if the medida has already an ID
* @throws URISyntaxException if the Location URI syntax is incorrect
*/
@PostMapping("/medidas")
@Timed
public ResponseEntity<Medida> createMedida(@Valid @RequestBody Medida medida) throws URISyntaxException {
log.debug("REST request to save Medida : {}", medida);
if (medida.getId() != null) {
return ResponseEntity.badRequest().headers(HeaderUtil.createFailureAlert(ENTITY_NAME, "idexists", "A new medida cannot already have an ID")).body(null);
}
Medida result = medidaRepository.save(medida);
return ResponseEntity.created(new URI("/api/medidas/" + result.getId()))
.headers(HeaderUtil.createEntityCreationAlert(ENTITY_NAME, result.getId().toString()))
.body(result);
}

/**
* PUT /medidas : Updates an existing medida.
*
* @param medida the medida to update
* @return the ResponseEntity with status 200 (OK) and with body the updated medida,
* or with status 400 (Bad Request) if the medida is not valid,
* or with status 500 (Internal Server Error) if the medida couldnt be updated
* @throws URISyntaxException if the Location URI syntax is incorrect
*/
@PutMapping("/medidas")
@Timed
public ResponseEntity<Medida> updateMedida(@Valid @RequestBody Medida medida) throws URISyntaxException {
log.debug("REST request to update Medida : {}", medida);
if (medida.getId() == null) {
return createMedida(medida);
}
Medida result = medidaRepository.save(medida);
return ResponseEntity.ok()
.headers(HeaderUtil.createEntityUpdateAlert(ENTITY_NAME, medida.getId().toString()))
.body(result);
}

/**
* GET /medidas : get all the medidas.
*
* @return the ResponseEntity with status 200 (OK) and the list of medidas in body
*/
@GetMapping("/medidas")
@Timed
public List<Medida> getAllMedidas() {
log.info("------------------ REST request to get all Medidas");
List<Medida> medidas = medidaRepository.findAll();
return medidas;
}

/**
* GET /medidas/medidas : get all the medidas por cliente.
*
* @return the ResponseEntity with status 200 (OK) and the list of medidas in body
*/
@GetMapping("/medidas/cliente/{id}")
@Timed
public List<Medida> getAllMedidasCliente(@PathVariable Long id) {
log.debug("REST request to get all Medidas");
log.info("ID de cliente:" + id);
Cliente cliente = clienteRepository.getOne(id);
log.info("Cliente encontrado: "+ cliente);
List<Medida> medidas = medidaRepository.findAllByCliente(cliente);
return medidas;
}

/**
* GET /medidas/:id : get the "id" medida.
*
* @param id the id of the medida to retrieve
* @return the ResponseEntity with status 200 (OK) and with body the medida, or with status 404 (Not Found)
*/
@GetMapping("/medidas/{id}")
@Timed
public ResponseEntity<Medida> getMedida(@PathVariable Long id) {
log.debug("REST request to get Medida : {}", id);
Medida medida = medidaRepository.findOne(id);
return ResponseUtil.wrapOrNotFound(Optional.ofNullable(medida));
}

/**
* DELETE /medidas/:id : delete the "id" medida.
*
* @param id the id of the medida to delete
* @return the ResponseEntity with status 200 (OK)
*/
@DeleteMapping("/medidas/{id}")
@Timed
public ResponseEntity<Void> deleteMedida(@PathVariable Long id) {
log.debug("REST request to delete Medida : {}", id);
medidaRepository.delete(id);
return ResponseEntity.ok().headers(HeaderUtil.createEntityDeletionAlert(ENTITY_NAME, id.toString())).build();
}

}

这个错误发生在咨询API:http://localhost:9060/anelapi/api/medidas/cliente/1

2017-04-10 15:48:23.425 DEBUG 10068 --- [  XNIO-2 task-4] c.a.clothes.web.rest.MedidaResource      : REST request to get all Medidas
2017-04-10 15:48:23.429 INFO 10068 --- [ XNIO-2 task-4] c.a.clothes.web.rest.MedidaResource : ID de cliente:1
2017-04-10 15:48:23.435 ERROR 10068 --- [ XNIO-2 task-4] c.a.clothes.aop.logging.LoggingAspect : Exception in com.anelsoftware.clothes.web.rest.MedidaResource.getAllMedidasCliente() with cause = 'NULL' and exception = 'could not initialize proxy - no Session'

org.hibernate.LazyInitializationException: could not initialize proxy - no Session
at org.hibernate.proxy.AbstractLazyInitializer.initialize(AbstractLazyInitializer.java:146)
at org.hibernate.proxy.AbstractLazyInitializer.getImplementation(AbstractLazyInitializer.java:259)
at org.hibernate.proxy.pojo.javassist.JavassistLazyInitializer.invoke(JavassistLazyInitializer.java:73)
at com.anelsoftware.clothes.domain.Cliente_$$_jvstc20_0.toString(Cliente_$$_jvstc20_0.java)
at java.lang.String.valueOf(Unknown Source)
at java.lang.StringBuilder.append(Unknown Source)
at com.anelsoftware.clothes.web.rest.MedidaResource.getAllMedidasCliente(MedidaResource.java:106)

如果我尝试http://localhost:9060/anelapi/api/medidas这个工作没问题

希望你的帮助,谢谢

最佳答案

如果您想使用关系调用 2 个存储库,则应通过使用 @Transactional 注释 getAllMedidasCliente() 将它们包含在同一事务中。

更好的是,引入一个客户端服务来处理事务方面的问题,顺便说一句,这是 yo jhipster:entity 提出的选项之一。

此外,您可能只想调用 clienteRepository 并启用 JPA eager fetching 以通过 cliente 获取所有 medidas。

关于java - jhipster LazyInitializationException,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/43330963/

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