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

Question

我正在尝试用spring-data-couchbase版本1.0.0.RELEASE持久化这个对象：

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，我得到了一个MappingException。下面是完整堆栈。AFAIK entiry似乎很好。spring-data-couchbase还需要什么额外的东西吗？

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，您需要一个不为空的ID，因为Couchbase本身通过其唯一的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。

Answer 2

我认为问题有以下几点：

1:您的类上有@Entity注释，这是一个JPA注释。改用org.springframework.data.couchbase.core.mapping.Document注解

2: CouchBase存储名为_id的in，因此您应该将类中的字段重命名为_id (根据http://developer.couchbase.com/documentation/mobile/current/develop/guides/couchbase-lite/native-api/document/index.html#special-properties)

Answer 3

您可以使用以下内容

import com.couchbase.client.java.repository.annotation.Field;
import com.couchbase.client.java.repository.annotation.Id;

@Id
@GeneratedValue(strategy = GenerationStrategy.UNIQUE)
public String id;