GOAL：我只是想在Spring HATEOAS应用程序的REST端点上调用一个get调用。 这是一个以MongoDB作为数据库的简单项目。
预期结果：当我尝试从 REST 控制器类调用 Get 终结点时，应返回适当的响应。
实际结果：无法调用 Get 端点，在使用邮递员调用时给我一个内部服务器错误。
下面是我尝试调用的 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"
}
我尝试过什么：基本上我的Spring启动应用程序试图执行客户和订单功能的CRUD操作。 我已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，我可以看到MongoDB指南针中的所有数据。 我的应用启动时没有任何错误。但是当我尝试调用任何 REST 端点时，它会给我一个错误。
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-excersiespring-hateoas-baeldung - with mongotargetclasses started by buddhika_jayakodi in D:Java-excersiespring-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();
}
}
以下是模型包的Customer类和Order类
客户.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 +
'}';
}
}
然后是订单.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> {
}
订单存储库
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，我有客户服务和订单服务接口及其各自的实现。
客户服务及其实施
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();
}
}
然后订单服务及其实现
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);
}
}
在我的主类中，我实现了CommandLineRunner，以便我可以用示例数据填充MongoDB数据库。
下面是主要类。
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，下面是我的应用程序属性文件
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。 但请耐心等待。 如果有人能给我一些见解，如何修复上述作为堆栈跟踪给出的错误，那么将不胜感激。
日安！
你确定你想要你的实体/模型吗？Customer和Order，从具有属性private final List<Link> links;RepresentationModel类继承？
如果您看一下RepresentationModel.java的定义，它清楚地表明它是DTO 收集链接的基类，所以恕我直言，我认为它应该用于 DTO，而不是实体。
否则，如果您想保持它如您所描述的那样，我认为避免错误的唯一方法是忽略links字段：
- 覆盖
links的获取者 - 将
@Transient放在RepresentationModel类links属性的获取者上
它将看起来像这样：
@Transient
@Override
public Links getLinks() {
return super.getLinks();
}
如果这种方法不起作用，请尝试为您的实体创建专用的 DTO，您的每个 DTO 都将从RepresentationModel继承，这样您就可以避免嘈杂的异常并保持清洁！
解决此异常的一种可能方法是通过 setter 使属性可变(假设保留空链接集合是可以接受的)：
@AccessType(AccessType.Type.PROPERTY)
public void setLinks(List<Link> links) {
super.removeLinks();
super.add(links);
}
您甚至可以将其放在自定义父类中，并让该类扩展 RepresentationModel，例如：
public abstract class MyRepresentationModel extends RepresentationModel<MyRepresentationModel> { ...