问题描述
目标：我只是想在Spring HATEOAS应用程序的REST端点上调用get调用。 这是一个简单的项目，使用MongoDB作为数据库。
预期结果：当我尝试从REST控制器类调用Get端点时，应该返回适当的响应。
实际结果：无法调用Get端点，使用邮递员调用时出现内部服务器错误。
下面是我要调用的REST端点
localhost:8086/api/customers
下面是错误响应
{
"timestamp": "2020-09-01T17:34:28.779+00:00","status": 500,"error": "Internal Server Error","message": "","path": "/api/customers"
}
我尝试过的事情：基本上，我的Spring引导应用程序尝试执行客户和订单功能的CRUD操作。 最初，我已经将一些示例数据预加载到mongodb数据库中。当我运行应用程序时，我可以从MongoDB指南针看到所有数据。 我的应用程序启动时没有任何错误。但是当我尝试调用任何REST端点时，它给了我一个错误。
下面是完整的堆栈跟踪。
2020-09-01 23:03:11.446 INFO 15824 --- [ main] com.devzigma.DemoApplication : Starting DemoApplication on sll014289 with PID 15824 (D:\Java-excersie\spring-hateoas-baeldung - with mongo\target\classes started by buddhika_jayakodi in D:\Java-excersie\spring-hateoas-baeldung - with mongo)
2020-09-01 23:03:11.449 INFO 15824 --- [ main] com.devzigma.DemoApplication : No active profile set,falling back to default profiles: default
2020-09-01 23:03:12.192 INFO 15824 --- [ main] .s.d.r.c.RepositoryConfigurationDelegate : Bootstrapping Spring Data MongoDB repositories in DEFAULT mode.
2020-09-01 23:03:12.288 INFO 15824 --- [ main] .s.d.r.c.RepositoryConfigurationDelegate : Finished Spring Data repository scanning in 91ms. Found 2 MongoDB repository interfaces.
2020-09-01 23:03:12.994 INFO 15824 --- [ main] o.s.b.w.embedded.tomcat.TomcatWebServer : Tomcat initialized with port(s): 8086 (http)
2020-09-01 23:03:13.005 INFO 15824 --- [ main] o.apache.catalina.core.StandardService : Starting service [Tomcat]
2020-09-01 23:03:13.005 INFO 15824 --- [ main] org.apache.catalina.core.StandardEngine : Starting Servlet engine: [Apache Tomcat/9.0.37]
2020-09-01 23:03:13.177 INFO 15824 --- [ main] o.a.c.c.C.[Tomcat].[localhost].[/] : Initializing Spring embedded WebApplicationContext
2020-09-01 23:03:13.177 INFO 15824 --- [ main] w.s.c.ServletWebServerApplicationContext : Root WebApplicationContext: initialization completed in 1650 ms
2020-09-01 23:03:13.320 INFO 15824 --- [ main] org.mongodb.driver.cluster : Cluster created with settings {hosts=[localhost:27017],mode=SINGLE,requiredClusterType=UNKNowN,serverSelectionTimeout='30000 ms'}
2020-09-01 23:03:13.371 INFO 15824 --- [localhost:27017] org.mongodb.driver.connection : Opened connection [connectionId{localValue:1,serverValue:164}] to localhost:27017
2020-09-01 23:03:13.375 INFO 15824 --- [localhost:27017] org.mongodb.driver.cluster : Monitor thread successfully connected to server with description ServerDescription{address=localhost:27017,type=STANDALONE,state=CONNECTED,ok=true,minWireversion=0,maxWireversion=9,maxDocumentSize=16777216,logicalSessionTimeoutMinutes=30,roundtripTimeNanos=2701575}
2020-09-01 23:03:14.086 INFO 15824 --- [ main] o.s.s.concurrent.ThreadPoolTaskExecutor : Initializing ExecutorService 'applicationTaskExecutor'
2020-09-01 23:03:14.287 INFO 15824 --- [ main] o.s.b.w.embedded.tomcat.TomcatWebServer : Tomcat started on port(s): 8086 (http) with context path ''
2020-09-01 23:03:14.298 INFO 15824 --- [ main] com.devzigma.DemoApplication : Started DemoApplication in 3.483 seconds (JVM running for 4.443)
2020-09-01 23:03:14.338 INFO 15824 --- [ main] org.mongodb.driver.connection : Opened connection [connectionId{localValue:2,serverValue:165}] to localhost:27017
2020-09-01 23:04:28.673 INFO 15824 --- [nio-8086-exec-1] o.a.c.c.C.[Tomcat].[localhost].[/] : Initializing Spring dispatcherServlet 'dispatcherServlet'
2020-09-01 23:04:28.673 INFO 15824 --- [nio-8086-exec-1] o.s.web.servlet.dispatcherServlet : Initializing Servlet 'dispatcherServlet'
2020-09-01 23:04:28.677 INFO 15824 --- [nio-8086-exec-1] o.s.web.servlet.dispatcherServlet : Completed initialization in 4 ms
2020-09-01 23:04:28.754 ERROR 15824 --- [nio-8086-exec-1] o.a.c.c.C.[.[.[/].[dispatcherServlet] : Servlet.service() for servlet [dispatcherServlet] in context with path [] threw exception [Request processing Failed; nested exception is java.lang.IllegalStateException: Cannot set property links because no setter,no wither and it's not part of the persistence constructor public com.devzigma.model.Order()!] with root cause
java.lang.IllegalStateException: Cannot set property links because no setter,no wither and it's not part of the persistence constructor public com.devzigma.model.Order()!
at org.springframework.data.mapping.model.InstantiationAwarePropertyAccessor.setProperty(InstantiationAwarePropertyAccessor.java:118) ~[spring-data-commons-2.3.3.RELEASE.jar:2.3.3.RELEASE]
at org.springframework.data.mapping.model.ConvertingPropertyAccessor.setProperty(ConvertingPropertyAccessor.java:63) ~[spring-data-commons-2.3.3.RELEASE.jar:2.3.3.RELEASE]
at org.springframework.data.mongodb.core.convert.MappingMongoConverter.readProperties(MappingMongoConverter.java:450) ~[spring-data-mongodb-3.0.3.RELEASE.jar:3.0.3.RELEASE]
at org.springframework.data.mongodb.core.convert.MappingMongoConverter.populateProperties(MappingMongoConverter.java:367) ~[spring-data-mongodb-3.0.3.RELEASE.jar:3.0.3.RELEASE]
at org.springframework.data.mongodb.core.convert.MappingMongoConverter.read(MappingMongoConverter.java:347) ~[spring-data-mongodb-3.0.3.RELEASE.jar:3.0.3.RELEASE]
at org.springframework.data.mongodb.core.convert.MappingMongoConverter.read(MappingMongoConverter.java:317) ~[spring-data-mongodb-3.0.3.RELEASE.jar:3.0.3.RELEASE]
at org.springframework.data.mongodb.core.convert.MappingMongoConverter.readMap(MappingMongoConverter.java:1187) ~[spring-data-mongodb-3.0.3.RELEASE.jar:3.0.3.RELEASE]
at org.springframework.data.mongodb.core.convert.MappingMongoConverter.read(MappingMongoConverter.java:288) ~[spring-data-mongodb-3.0.3.RELEASE.jar:3.0.3.RELEASE]
at org.springframework.data.mongodb.core.convert.MappingMongoConverter.readValue(MappingMongoConverter.java:1580) ~[spring-data-mongodb-3.0.3.RELEASE.jar:3.0.3.RELEASE]
at org.springframework.data.mongodb.core.convert.MappingMongoConverter$MongoDbPropertyValueProvider.getPropertyValue(MappingMongoConverter.java:1478) ~[spring-data-mongodb-3.0.3.RELEASE.jar:3.0.3.RELEASE]
at org.springframework.data.mongodb.core.convert.MappingMongoConverter.readProperties(MappingMongoConverter.java:450) ~[spring-data-mongodb-3.0.3.RELEASE.jar:3.0.3.RELEASE]
at org.springframework.data.mongodb.core.convert.MappingMongoConverter.populateProperties(MappingMongoConverter.java:367) ~[spring-data-mongodb-3.0.3.RELEASE.jar:3.0.3.RELEASE]
at org.springframework.data.mongodb.core.convert.MappingMongoConverter.read(MappingMongoConverter.java:347) ~[spring-data-mongodb-3.0.3.RELEASE.jar:3.0.3.RELEASE]
at org.springframework.data.mongodb.core.convert.MappingMongoConverter.read(MappingMongoConverter.java:317) ~[spring-data-mongodb-3.0.3.RELEASE.jar:3.0.3.RELEASE]
at org.springframework.data.mongodb.core.convert.MappingMongoConverter.read(MappingMongoConverter.java:250) ~[spring-data-mongodb-3.0.3.RELEASE.jar:3.0.3.RELEASE]
at org.springframework.data.mongodb.core.convert.MappingMongoConverter.read(MappingMongoConverter.java:246) ~[spring-data-mongodb-3.0.3.RELEASE.jar:3.0.3.RELEASE]
at org.springframework.data.mongodb.core.convert.MappingMongoConverter.read(MappingMongoConverter.java:98) ~[spring-data-mongodb-3.0.3.RELEASE.jar:3.0.3.RELEASE]
at org.springframework.data.mongodb.core.MongoTemplate$ReadDocumentCallback.doWith(MongoTemplate.java:3141) ~[spring-data-mongodb-3.0.3.RELEASE.jar:3.0.3.RELEASE]
at org.springframework.data.mongodb.core.MongoTemplate.executeFindMultiInternal(MongoTemplate.java:2788) ~[spring-data-mongodb-3.0.3.RELEASE.jar:3.0.3.RELEASE]
at org.springframework.data.mongodb.core.MongoTemplate.doFind(MongoTemplate.java:2518) ~[spring-data-mongodb-3.0.3.RELEASE.jar:3.0.3.RELEASE]
at org.springframework.data.mongodb.core.MongoTemplate.doFind(MongoTemplate.java:2500) ~[spring-data-mongodb-3.0.3.RELEASE.jar:3.0.3.RELEASE]
at org.springframework.data.mongodb.core.MongoTemplate.find(MongoTemplate.java:856) ~[spring-data-mongodb-3.0.3.RELEASE.jar:3.0.3.RELEASE]
at org.springframework.data.mongodb.repository.support.SimpleMongoRepository.findAll(SimpleMongoRepository.java:383) ~[spring-data-mongodb-3.0.3.RELEASE.jar:3.0.3.RELEASE]
at org.springframework.data.mongodb.repository.support.SimpleMongoRepository.findAll(SimpleMongoRepository.java:205) ~[spring-data-mongodb-3.0.3.RELEASE.jar:3.0.3.RELEASE]
at org.springframework.data.mongodb.repository.support.SimpleMongoRepository.findAll(SimpleMongoRepository.java:55) ~[spring-data-mongodb-3.0.3.RELEASE.jar:3.0.3.RELEASE]
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:1.8.0_221]
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[na:1.8.0_221]
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:1.8.0_221]
at java.lang.reflect.Method.invoke(Method.java:498) ~[na:1.8.0_221]
at org.springframework.data.repository.core.support.ImplementationInvocationMetadata.invoke(ImplementationInvocationMetadata.java:72) ~[spring-data-commons-2.3.3.RELEASE.jar:2.3.3.RELEASE]
at org.springframework.data.repository.core.support.RepositoryComposition$RepositoryFragments.invoke(RepositoryComposition.java:382) ~[spring-data-commons-2.3.3.RELEASE.jar:2.3.3.RELEASE]
at org.springframework.data.repository.core.support.RepositoryComposition.invoke(RepositoryComposition.java:205) ~[spring-data-commons-2.3.3.RELEASE.jar:2.3.3.RELEASE]
at org.springframework.data.repository.core.support.RepositoryFactorySupport$ImplementationMethodExecutionInterceptor.invoke(RepositoryFactorySupport.java:549) ~[spring-data-commons-2.3.3.RELEASE.jar:2.3.3.RELEASE]
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:186) ~[spring-aop-5.2.8.RELEASE.jar:5.2.8.RELEASE]
at org.springframework.data.repository.core.support.QueryExecutorMethodInterceptor.doInvoke(QueryExecutorMethodInterceptor.java:155) ~[spring-data-commons-2.3.3.RELEASE.jar:2.3.3.RELEASE]
at org.springframework.data.repository.core.support.QueryExecutorMethodInterceptor.invoke(QueryExecutorMethodInterceptor.java:130) ~[spring-data-commons-2.3.3.RELEASE.jar:2.3.3.RELEASE]
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:186) ~[spring-aop-5.2.8.RELEASE.jar:5.2.8.RELEASE]
at org.springframework.data.projection.DefaultMethodInvokingMethodInterceptor.invoke(DefaultMethodInvokingMethodInterceptor.java:80) ~[spring-data-commons-2.3.3.RELEASE.jar:2.3.3.RELEASE]
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:186) ~[spring-aop-5.2.8.RELEASE.jar:5.2.8.RELEASE]
at org.springframework.aop.interceptor.ExposeInvocationInterceptor.invoke(ExposeInvocationInterceptor.java:95) ~[spring-aop-5.2.8.RELEASE.jar:5.2.8.RELEASE]
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:186) ~[spring-aop-5.2.8.RELEASE.jar:5.2.8.RELEASE]
at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:212) ~[spring-aop-5.2.8.RELEASE.jar:5.2.8.RELEASE]
at com.sun.proxy.$Proxy60.findAll(UnkNown Source) ~[na:na]
at com.devzigma.services.CustomerServiceImpl.allCustomers(CustomerServiceImpl.java:24) ~[classes/:na]
at com.devzigma.controller.CustomerController.getAll(CustomerController.java:38) ~[classes/:na]
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:1.8.0_221]
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[na:1.8.0_221]
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:1.8.0_221]
at java.lang.reflect.Method.invoke(Method.java:498) ~[na:1.8.0_221]
at org.springframework.web.method.support.invocableHandlerMethod.doInvoke(invocableHandlerMethod.java:190) ~[spring-web-5.2.8.RELEASE.jar:5.2.8.RELEASE]
at org.springframework.web.method.support.invocableHandlerMethod.invokeForRequest(invocableHandlerMethod.java:138) ~[spring-web-5.2.8.RELEASE.jar:5.2.8.RELEASE]
at org.springframework.web.servlet.mvc.method.annotation.ServletinvocableHandlerMethod.invokeAndHandle(ServletinvocableHandlerMethod.java:105) ~[spring-webmvc-5.2.8.RELEASE.jar:5.2.8.RELEASE]
at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod(RequestMappingHandlerAdapter.java:878) ~[spring-webmvc-5.2.8.RELEASE.jar:5.2.8.RELEASE]
at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:792) ~[spring-webmvc-5.2.8.RELEASE.jar:5.2.8.RELEASE]
at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:87) ~[spring-webmvc-5.2.8.RELEASE.jar:5.2.8.RELEASE]
at org.springframework.web.servlet.dispatcherServlet.dodispatch(dispatcherServlet.java:1040) ~[spring-webmvc-5.2.8.RELEASE.jar:5.2.8.RELEASE]
at org.springframework.web.servlet.dispatcherServlet.doService(dispatcherServlet.java:943) ~[spring-webmvc-5.2.8.RELEASE.jar:5.2.8.RELEASE]
at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:1006) ~[spring-webmvc-5.2.8.RELEASE.jar:5.2.8.RELEASE]
at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:898) ~[spring-webmvc-5.2.8.RELEASE.jar:5.2.8.RELEASE]
at javax.servlet.http.HttpServlet.service(HttpServlet.java:626) ~[tomcat-embed-core-9.0.37.jar:4.0.FR]
at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:883) ~[spring-webmvc-5.2.8.RELEASE.jar:5.2.8.RELEASE]
at javax.servlet.http.HttpServlet.service(HttpServlet.java:733) ~[tomcat-embed-core-9.0.37.jar:4.0.FR]
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:231) ~[tomcat-embed-core-9.0.37.jar:9.0.37]
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[tomcat-embed-core-9.0.37.jar:9.0.37]
at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53) ~[tomcat-embed-websocket-9.0.37.jar:9.0.37]
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) ~[tomcat-embed-core-9.0.37.jar:9.0.37]
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[tomcat-embed-core-9.0.37.jar:9.0.37]
at org.springframework.web.filter.RequestContextFilter.doFilterInternal(RequestContextFilter.java:100) ~[spring-web-5.2.8.RELEASE.jar:5.2.8.RELEASE]
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119) ~[spring-web-5.2.8.RELEASE.jar:5.2.8.RELEASE]
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) ~[tomcat-embed-core-9.0.37.jar:9.0.37]
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[tomcat-embed-core-9.0.37.jar:9.0.37]
at org.springframework.web.filter.FormContentFilter.doFilterInternal(FormContentFilter.java:93) ~[spring-web-5.2.8.RELEASE.jar:5.2.8.RELEASE]
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119) ~[spring-web-5.2.8.RELEASE.jar:5.2.8.RELEASE]
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) ~[tomcat-embed-core-9.0.37.jar:9.0.37]
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[tomcat-embed-core-9.0.37.jar:9.0.37]
at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:201) ~[spring-web-5.2.8.RELEASE.jar:5.2.8.RELEASE]
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119) ~[spring-web-5.2.8.RELEASE.jar:5.2.8.RELEASE]
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) ~[tomcat-embed-core-9.0.37.jar:9.0.37]
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[tomcat-embed-core-9.0.37.jar:9.0.37]
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:202) ~[tomcat-embed-core-9.0.37.jar:9.0.37]
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:96) [tomcat-embed-core-9.0.37.jar:9.0.37]
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:541) [tomcat-embed-core-9.0.37.jar:9.0.37]
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:139) [tomcat-embed-core-9.0.37.jar:9.0.37]
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:92) [tomcat-embed-core-9.0.37.jar:9.0.37]
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:74) [tomcat-embed-core-9.0.37.jar:9.0.37]
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:343) [tomcat-embed-core-9.0.37.jar:9.0.37]
at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:373) [tomcat-embed-core-9.0.37.jar:9.0.37]
at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:65) [tomcat-embed-core-9.0.37.jar:9.0.37]
at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:868) [tomcat-embed-core-9.0.37.jar:9.0.37]
at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1589) [tomcat-embed-core-9.0.37.jar:9.0.37]
at org.apache.tomcat.util.net.socketProcessorBase.run(SocketProcessorBase.java:49) [tomcat-embed-core-9.0.37.jar:9.0.37]
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149) [na:1.8.0_221]
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624) [na:1.8.0_221]
at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61) [tomcat-embed-core-9.0.37.jar:9.0.37]
at java.lang.Thread.run(Thread.java:748) [na:1.8.0_221]
下面是CustomerController类。
package com.devzigma.controller;
import com.devzigma.model.Customer;
import com.devzigma.model.Order;
import com.devzigma.services.CustomerService;
import com.devzigma.services.OrderService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.hateoas.CollectionModel;
import org.springframework.hateoas.Link;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import java.util.List;
import java.util.Optional;
import static org.springframework.hateoas.server.mvc.WebMvcLinkBuilder.linkTo;
import static org.springframework.hateoas.server.mvc.WebMvcLinkBuilder.methodon;
@RestController
@RequestMapping("/api")
public class CustomerController {
@Autowired
private CustomerService customerService;
@Autowired
private OrderService orderService;
@GetMapping(value = "/customers/{customerId}")
public Optional<Customer> getCustomerById(@PathVariable String customerId) {
return customerService.getCustomerDetail(customerId);
}
@GetMapping(value = "/customers")
public List<Customer> getAll() {
return customerService.allCustomers();
}
}
下面是模型包的Customer和Order类
Customer.java类
package com.devzigma.model;
import org.springframework.data.mongodb.core.mapping.Document;
import org.springframework.hateoas.RepresentationModel;
import java.util.Map;
@Document
public class Customer extends RepresentationModel<Customer> {
private String customerId;
private String customerName;
private String companyName;
private Map<String,Order> orders;
public Customer() {
}
public Customer(String customerId,String customerName,String companyName) {
this.customerId = customerId;
this.customerName = customerName;
this.companyName = companyName;
}
public String getCustomerId() {
return customerId;
}
public void setCustomerId(String customerId) {
this.customerId = customerId;
}
public String getCustomerName() {
return customerName;
}
public void setCustomerName(String customerName) {
this.customerName = customerName;
}
public String getCompanyName() {
return companyName;
}
public void setCompanyName(String companyName) {
this.companyName = companyName;
}
public Map<String,Order> getorders() {
return orders;
}
public void setorders(final Map<String,Order> orders) {
this.orders = orders;
}
@Override
public String toString() {
return "Customer{" +
"customerId='" + customerId + '\'' +
",customerName='" + customerName + '\'' +
",companyName='" + companyName + '\'' +
",orders=" + orders +
'}';
}
}
然后是Order.java类
package com.devzigma.model;
import org.springframework.data.mongodb.core.mapping.Document;
import org.springframework.hateoas.RepresentationModel;
@Document
public class Order extends RepresentationModel<Order> {
private String orderId;
private double price;
private int quantity;
public Order() {
}
public Order(String orderId,double price,int quantity) {
this.orderId = orderId;
this.price = price;
this.quantity = quantity;
}
public String getorderId() {
return orderId;
}
public void setorderId(String orderId) {
this.orderId = orderId;
}
public double getPrice() {
return price;
}
public void setPrice(double price) {
this.price = price;
}
public int getQuantity() {
return quantity;
}
public void setQuantity(int quantity) {
this.quantity = quantity;
}
@Override
public String toString() {
return "Order{" +
"orderId='" + orderId + '\'' +
",price=" + price +
",quantity=" + quantity +
'}';
}
}
下面是扩展MongoRepository
的两个存储库接口客户存储库
package com.devzigma.repository;
import com.devzigma.model.Customer;
import org.springframework.data.mongodb.repository.MongoRepository;
public interface CustomerRepository extends MongoRepository<Customer,String> {
}
OrderRepository
package com.devzigma.repository;
import com.devzigma.model.Order;
import org.springframework.data.mongodb.repository.MongoRepository;
public interface OrderRepository extends MongoRepository<Order,String> {
}
在服务包中，我具有CustomerService和OrderService接口及其各自的实现。
CustomerService 及其实现
package com.devzigma.services;
import com.devzigma.model.Customer;
import java.util.List;
import java.util.Optional;
public interface CustomerService {
Optional<Customer> getCustomerDetail(String id);
List<Customer> allCustomers();
}
package com.devzigma.services;
import com.devzigma.model.Customer;
import com.devzigma.repository.CustomerRepository;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import java.util.*;
@Service
public class CustomerServiceImpl implements CustomerService {
@Autowired
private CustomerRepository customerRepository;
@Override
public Optional<Customer> getCustomerDetail(String id) {
return customerRepository.findById(id);
}
@Override
public List<Customer> allCustomers() {
return customerRepository.findAll();
}
}
然后使用OrderService及其实现
package com.devzigma.services;
import com.devzigma.model.Order;
import java.util.Optional;
public interface OrderService {
Optional<Order> getAllOrdersForCustomer(String customerId);
}
package com.devzigma.services;
import com.devzigma.model.Order;
import com.devzigma.repository.CustomerRepository;
import com.devzigma.repository.OrderRepository;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import java.util.*;
@Service
public class OrderServiceImpl implements OrderService {
@Autowired
private CustomerRepository customerRepository;
@Autowired
private OrderRepository orderRepository;
@Override
public Optional<Order> getAllOrdersForCustomer(String customerId) {
return orderRepository.findById(customerId);
}
}
在主类中，我实现了CommandLineRunner，以便可以使用示例数据填充MongoDB数据库。
下面是主要课程。
package com.devzigma;
import com.devzigma.model.Customer;
import com.devzigma.model.Order;
import com.devzigma.repository.CustomerRepository;
import com.devzigma.repository.OrderRepository;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.CommandLineRunner;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import java.util.HashMap;
@SpringBootApplication
public class DemoApplication implements CommandLineRunner {
@Autowired
private CustomerRepository customerRepository;
@Autowired
private OrderRepository orderRepository;
public static void main(String[] args) {
SpringApplication.run(DemoApplication.class,args);
}
@Override
public void run(String... args) throws Exception {
customerRepository.deleteall();
orderRepository.deleteall();
final Customer customer1 = new Customer("10A","Jane","ABC Company");
final Customer customer2 = new Customer("20B","Bob","XYZ Company");
final Customer customer3 = new Customer("30C","Tim","CKV Company");
HashMap<String,Order> cus1order = new HashMap<>();
cus1order.put("001A",new Order("001A",150.00,25));
cus1order.put("002A",new Order("002A",250.00,15));
customer1.setorders(cus1order);
customerRepository.save(customer1);
customerRepository.save(customer2);
customerRepository.save(customer3);
}
}
最后，下面是我的application.properties文件
server.port=8086
spring.data.mongodb.authentication-database=admin
spring.data.mongodb.uri=mongodb://localhost:27017/customer-order
我知道这是很多样板代码。但是请忍受我。 如果有人能提供我的见解如何解决上述作为堆栈跟踪信息给出的错误，那么将不胜感激。
美好的一天！
解决方法
您确定要使用实体/模型吗？ Customer和Order，要继承具有属性RepresentationModel的{{1}}类吗？
如果您看看private final List<Link> links;的{{3}}，它会清楚地表明这是DTO收集链接的基类。，所以我想恕我直言它应该用于DTO，而不是用于实体。
否则，如果您希望按照说明进行操作，那么我看到避免该错误的唯一方法是忽略RepresentationModel.java字段的持久性：
- 覆盖
links的吸气剂 - 将
links放在@Transient类的links属性的获取器上
它看起来像这样：
RepresentationModel如果这种方法不起作用，请尝试为您的实体创建专用的DTO，并且每个DTO都将从@Transient
@Override
public Links getLinks() {
return super.getLinks();
}
继承，这样您就可以避免嘈杂的异常并保持环境清洁！