java - spring-data-couchbase - org.springframework.data.mapping.model.MappingException

Question

我正在尝试使用 spring-data-couchbase 版本 1.0.0.RELEASE 来持久化对象:

package com.spring.data.couchbase.user;

import javax.persistence.Entity;

import org.springframework.data.annotation.Id;
import org.springframework.data.couchbase.core.mapping.Field;

@Entity
public class User {

@Id
private String id;

public String getId() {
    return id;
}

public void setId(String id) {
    this.id = id;
}

@Field("lastName")
private String lastName;

public String getLastName() {
    return lastName;
}

public void setLastname(String lastName) {
    this.lastName = lastName;
}

public String getFirstName() {
    return firstName;
}

public void setFirstName(String firstName) {
    this.firstName = firstName;
}

@Field("firstName")
private String firstName;

   }

当我尝试将对象保存到 couchbase 数据库时，出现 MappingException。下面的完整堆栈。 AFAIK entiry 似乎没问题。 spring-data-couchbase 有什么额外的期望吗？

Exception in thread "main" org.springframework.data.mapping.model.MappingException: An ID property is needed, but not found on this entity.
at org.springframework.data.couchbase.core.convert.MappingCouchbaseConverter.write(MappingCouchbaseConverter.java:316)
at org.springframework.data.couchbase.core.convert.MappingCouchbaseConverter.write(MappingCouchbaseConverter.java:50)
at org.springframework.data.couchbase.core.CouchbaseTemplate.save(CouchbaseTemplate.java:298)
at org.springframework.data.couchbase.core.CouchbaseTemplate.save(CouchbaseTemplate.java:149)
at org.springframework.data.couchbase.repository.support.SimpleCouchbaseRepository.save(SimpleCouchbaseRepository.java:82)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:601)
at org.springframework.data.repository.core.support.RepositoryFactorySupport$QueryExecutorMethodInterceptor.executeMethodOn(RepositoryFactorySupport.java:358)
at org.springframework.data.repository.core.support.RepositoryFactorySupport$QueryExecutorMethodInterceptor.invoke(RepositoryFactorySupport.java:343)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:172)
at org.springframework.data.couchbase.repository.support.ViewPostProcessor$ViewInterceptor.invoke(ViewPostProcessor.java:80)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:172)
at org.springframework.aop.interceptor.ExposeInvocationInterceptor.invoke(ExposeInvocationInterceptor.java:91)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:172)
at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:204)
at $Proxy18.save(Unknown Source)
at com.spring.data.couchbase.user.MyService.doWork(MyService.java:27)
at com.spring.data.couchbase.user.Main.main(Main.java:17)

Answer 1

正如作者所回答的，您需要有一个不为空的 ID，因为 Couchbase 本身通过其唯一 ID 来标识每个文档。您应该在您的 ID 之上添加验证，以确保它始终不为空且不为空。