SpringBoot + Mongodb 开发中关于MongoTamplate的配置问题

Question

背景：

项目使用maven管理，如下是依赖jar树结构：

[INFO] xxx:groupon-boot:jar:1.0
[INFO] +- org.springframework.boot:spring-boot-starter-web:jar:1.2.0.RELEASE:compile
[INFO] |  +- org.springframework.boot:spring-boot-starter:jar:1.2.0.RELEASE:compile
[INFO] |  |  +- org.springframework.boot:spring-boot:jar:1.2.0.RELEASE:compile
[INFO] |  |  +- org.springframework.boot:spring-boot-autoconfigure:jar:1.2.0.RELEASE:compile
[INFO] |  |  +- org.springframework.boot:spring-boot-starter-logging:jar:1.2.0.RELEASE:compile
[INFO] |  |  |  +- org.slf4j:jul-to-slf4j:jar:1.7.7:compile
[INFO] |  |  |  +- org.slf4j:log4j-over-slf4j:jar:1.7.7:compile
[INFO] |  |  |  \- ch.qos.logback:logback-classic:jar:1.1.2:compile
[INFO] |  |  |     \- ch.qos.logback:logback-core:jar:1.1.2:compile
[INFO] |  |  \- org.yaml:snakeyaml:jar:1.14:runtime
[INFO] |  +- org.springframework.boot:spring-boot-starter-tomcat:jar:1.2.0.RELEASE:compile
[INFO] |  |  +- org.apache.tomcat.embed:tomcat-embed-core:jar:8.0.15:compile
[INFO] |  |  +- org.apache.tomcat.embed:tomcat-embed-el:jar:8.0.15:compile
[INFO] |  |  +- org.apache.tomcat.embed:tomcat-embed-logging-juli:jar:8.0.15:compile
[INFO] |  |  \- org.apache.tomcat.embed:tomcat-embed-websocket:jar:8.0.15:compile
[INFO] |  +- com.fasterxml.jackson.core:jackson-databind:jar:2.4.4:compile
[INFO] |  |  +- com.fasterxml.jackson.core:jackson-annotations:jar:2.4.4:compile
[INFO] |  |  \- com.fasterxml.jackson.core:jackson-core:jar:2.4.4:compile
[INFO] |  +- org.hibernate:hibernate-validator:jar:5.1.3.Final:compile
[INFO] |  |  +- javax.validation:validation-api:jar:1.1.0.Final:compile
[INFO] |  |  +- org.jboss.logging:jboss-logging:jar:3.1.3.GA:compile
[INFO] |  |  \- com.fasterxml:classmate:jar:1.0.0:compile
[INFO] |  +- org.springframework:spring-core:jar:4.1.3.RELEASE:compile
[INFO] |  +- org.springframework:spring-web:jar:4.1.3.RELEASE:compile
[INFO] |  |  +- org.springframework:spring-aop:jar:4.1.3.RELEASE:compile
[INFO] |  |  |  \- aopalliance:aopalliance:jar:1.0:compile
[INFO] |  |  +- org.springframework:spring-beans:jar:4.1.3.RELEASE:compile
[INFO] |  |  \- org.springframework:spring-context:jar:4.1.3.RELEASE:compile
[INFO] |  \- org.springframework:spring-webmvc:jar:4.1.3.RELEASE:compile
[INFO] |     \- org.springframework:spring-expression:jar:4.1.3.RELEASE:compile
[INFO] +- org.springframework.boot:spring-boot-starter-redis:jar:1.2.0.RELEASE:compile
[INFO] |  +- org.springframework:spring-context-support:jar:4.1.3.RELEASE:compile
[INFO] |  +- org.springframework:spring-tx:jar:4.1.3.RELEASE:compile
[INFO] |  +- org.springframework.data:spring-data-redis:jar:1.4.1.RELEASE:compile
[INFO] |  |  \- org.slf4j:slf4j-api:jar:1.7.7:compile
[INFO] |  \- redis.clients:jedis:jar:2.5.2:compile
[INFO] |     \- org.apache.commons:commons-pool2:jar:2.2:compile
[INFO] +- org.springframework.boot:spring-boot-starter-data-jpa:jar:1.2.0.RELEASE:compile
[INFO] |  +- org.springframework.boot:spring-boot-starter-aop:jar:1.2.0.RELEASE:compile
[INFO] |  |  +- org.aspectj:aspectjrt:jar:1.8.4:compile
[INFO] |  |  \- org.aspectj:aspectjweaver:jar:1.8.4:compile
[INFO] |  +- org.springframework.boot:spring-boot-starter-jdbc:jar:1.2.0.RELEASE:compile
[INFO] |  |  +- org.springframework:spring-jdbc:jar:4.1.3.RELEASE:compile
[INFO] |  |  \- org.apache.tomcat:tomcat-jdbc:jar:8.0.15:compile
[INFO] |  |     \- org.apache.tomcat:tomcat-juli:jar:8.0.15:compile
[INFO] |  +- org.hibernate:hibernate-entitymanager:jar:4.3.7.Final:compile
[INFO] |  |  +- org.jboss.logging:jboss-logging-annotations:jar:1.2.0.Beta1:compile
[INFO] |  |  +- org.hibernate:hibernate-core:jar:4.3.7.Final:compile
[INFO] |  |  |  +- antlr:antlr:jar:2.7.7:compile
[INFO] |  |  |  \- org.jboss:jandex:jar:1.1.0.Final:compile
[INFO] |  |  +- org.hibernate.common:hibernate-commons-annotations:jar:4.0.5.Final:compile
[INFO] |  |  +- org.hibernate.javax.persistence:hibernate-jpa-2.1-api:jar:1.0.0.Final:compile
[INFO] |  |  +- org.jboss.spec.javax.transaction:jboss-transaction-api_1.2_spec:jar:1.0.0.Final:compile
[INFO] |  |  \- org.javassist:javassist:jar:3.18.1-GA:compile
[INFO] |  +- org.springframework:spring-orm:jar:4.1.3.RELEASE:compile
[INFO] |  +- org.springframework.data:spring-data-jpa:jar:1.7.1.RELEASE:compile
[INFO] |  |  +- org.springframework.data:spring-data-commons:jar:1.9.1.RELEASE:compile
[INFO] |  |  \- org.slf4j:jcl-over-slf4j:jar:1.7.7:compile
[INFO] |  \- org.springframework:spring-aspects:jar:4.1.3.RELEASE:compile
[INFO] +- org.hsqldb:hsqldb:jar:2.3.2:runtime
[INFO] \- witcool:groupon-mongodb:jar:1.0:compile
[INFO]    +- witcool:yqsp-mongo-common:jar:1.0:compile
[INFO]    |  +- witcool:yqsp-common:jar:1.0:compile
[INFO]    |  |  +- org.apache.httpcomponents:httpcore:jar:4.3.2:compile
[INFO]    |  |  +- org.apache.httpcomponents:httpclient:jar:4.3.6:compile
[INFO]    |  |  +- org.apache.httpcomponents:httpmime:jar:4.3.6:compile
[INFO]    |  |  \- commons-configuration:commons-configuration:jar:1.6:compile
[INFO]    |  |     +- commons-collections:commons-collections:jar:3.2.1:compile
[INFO]    |  |     +- commons-digester:commons-digester:jar:2.1:compile
[INFO]    |  |     |  \- commons-beanutils:commons-beanutils:jar:1.9.2:compile
[INFO]    |  |     \- commons-beanutils:commons-beanutils-core:jar:1.8.0:compile
[INFO]    |  +- org.springframework:spring-test:jar:4.1.3.RELEASE:compile
[INFO]    |  +- org.springframework.security:spring-security-core:jar:3.2.5.RELEASE:compile
[INFO]    |  +- org.springframework.security:spring-security-web:jar:3.2.5.RELEASE:compile
[INFO]    |  +- org.springframework.security:spring-security-config:jar:3.2.5.RELEASE:compile
[INFO]    |  +- org.springframework.security:spring-security-taglibs:jar:3.2.5.RELEASE:compile
[INFO]    |  |  \- org.springframework.security:spring-security-acl:jar:3.2.5.RELEASE:compile
[INFO]    |  +- org.springframework.security.oauth:spring-security-oauth2:jar:1.0.5.RELEASE:compile
[INFO]    |  +- javax.annotation:com.springsource.javax.annotation:jar:1.0.0:compile
[INFO]    |  +- javax.inject:javax.inject:jar:1:compile
[INFO]    |  +- mysql:mysql-connector-java:jar:5.1.34:compile
[INFO]    |  +- commons-dbcp:commons-dbcp:jar:1.4:compile
[INFO]    |  +- org.slf4j:slf4j-log4j12:jar:1.7.7:runtime
[INFO]    |  +- log4j:log4j:jar:1.2.17:compile
[INFO]    |  +- org.glassfish.jersey.media:jersey-media-json-jackson:jar:2.13:compile
[INFO]    |  |  \- org.glassfish.jersey.core:jersey-common:jar:2.13:compile
[INFO]    |  |     +- javax.ws.rs:javax.ws.rs-api:jar:2.0.1:compile
[INFO]    |  |     +- javax.annotation:javax.annotation-api:jar:1.2:compile
[INFO]    |  |     +- org.glassfish.jersey.bundles.repackaged:jersey-guava:jar:2.13:compile
[INFO]    |  |     +- org.glassfish.hk2:hk2-api:jar:2.3.0-b10:compile
[INFO]    |  |     |  +- org.glassfish.hk2:hk2-utils:jar:2.3.0-b10:compile
[INFO]    |  |     |  \- org.glassfish.hk2.external:aopalliance-repackaged:jar:2.3.0-b10:compile
[INFO]    |  |     +- org.glassfish.hk2.external:javax.inject:jar:2.3.0-b10:compile
[INFO]    |  |     +- org.glassfish.hk2:hk2-locator:jar:2.3.0-b10:compile
[INFO]    |  |     \- org.glassfish.hk2:osgi-resource-locator:jar:1.0.1:compile
[INFO]    |  +- com.fasterxml.jackson.jaxrs:jackson-jaxrs-json-provider:jar:2.3.2:compile
[INFO]    |  +- com.fasterxml.jackson.jaxrs:jackson-jaxrs-base:jar:2.3.2:compile
[INFO]    |  +- com.fasterxml.jackson.module:jackson-module-jaxb-annotations:jar:2.3.2:compile
[INFO]    |  \- cglib:cglib:jar:2.2.2:compile
[INFO]    |     \- asm:asm:jar:3.3.1:compile
[INFO]    +- org.springframework.data:spring-data-mongodb:jar:1.6.1.RELEASE:compile
[INFO]    |  \- org.mongodb:mongo-java-driver:jar:2.12.4:compile
[INFO]    +- commons-httpclient:commons-httpclient:jar:3.1:compile
[INFO]    |  \- commons-logging:commons-logging:jar:1.0.4:compile
[INFO]    +- commons-lang:commons-lang:jar:2.6:compile
[INFO]    +- commons-codec:commons-codec:jar:1.6:compile
[INFO]    +- org.codehaus.jackson:jackson-core-asl:jar:1.8.4:compile
[INFO]    +- org.codehaus.jackson:jackson-mapper-asl:jar:1.8.4:compile
[INFO]    +- dom4j:dom4j:jar:1.6.1:compile
[INFO]    |  \- xml-apis:xml-apis:jar:1.0.b2:compile
[INFO]    \- javax.servlet:javax.servlet-api:jar:3.1.0:compile

如下是spring配置文件：

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:context="http://www.springframework.org/schema/context"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:p="http://www.springframework.org/schema/p"
xmlns:c="http://www.springframework.org/schema/c" 
xmlns:repository="http://www.springframework.org/schema/data/repository"
xmlns:mongo="http://www.springframework.org/schema/data/mongo"
xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans.xsd
http://www.springframework.org/schema/context
http://www.springframework.org/schema/context/spring-context.xsd  
http://www.springframework.org/schema/data/repository
http://www.springframework.org/schema/data/repository/spring-repository.xsd
http://www.springframework.org/schema/data/mongo
http://www.springframework.org/schema/data/mongo/spring-mongo.xsd">


<context:component-scan base-package="com.xxx.groupon" />
<!-- Factory bean that creates the Mongo instance
 -->
<bean id="mongo" class="org.springframework.data.mongodb.core.MongoFactoryBean">
    <property name="host" value="localhost" />
    <property name="port" value="27017" />
</bean>
<bean id="grouponTemplate" class="org.springframework.data.mongodb.core.MongoTemplate">
    <constructor-arg name="mongo" ref="mongo" />
    <constructor-arg name="databaseName" value="groupon3" />
</bean>
<bean id="sequenceTemplate" class="org.springframework.data.mongodb.core.MongoTemplate">
    <constructor-arg name="mongo" ref="mongo" />
    <constructor-arg name="databaseName" value="sequences3" />
</bean>

问题：

执行打好的jar包后，报如下错误：
No qualifying bean of type [org.springframework.data.mongodb.core.MongoTemplate] found for dependency: expected at least 1 bean which qualifies as autowire candidate for this dependency.

我的想法是通过上面的jar树和配置文件，证明我已经依赖了spring-data-mongodb包。
那为什么仍然会提示我MongoTemplate没有定义？

---

更新：

感谢@Kavlez同学提醒和@XFHNever同学帮忙，的确是没有加载到配置文件，给入口类添加@ImportResource("applicationContext.xml")

加载成功后，又报NoUniqueBeanDefinitionException异常，描述为
No qualifying bean of type [org.springframework.data.mongodb.core.MongoTemplate] is defined: expected single matching bean but found 2: sequenceTemplate,grouponTemplate

但此时我注入的方式是@Autowired和@Qualifier("grouponTemplate")配合（在其他spring项目中这样做没有问题的）但为什么仍然会报NoUniqueBeanDefinitionException呢？

好吧，问题的原因没有找到，倒是让我侥幸解决了：
在spring配置文件中新添加了一个bean：

    <bean id="mongoTemplate" class="org.springframework.data.mongodb.core.MongoTemplate">
        <constructor-arg name="mongo" ref="mongo" />
        <constructor-arg name="databaseName" value="test" />
    </bean>

项目跑了起来～

最后，如果有幸得知该问题的原因，我更新在这个问题下面。再次感谢。

Answer 1

Daripada maklumat yang diberikan oleh subjek, kedua-dua MongoTemplates yang diisytiharkan dalam fail konfigurasi Spring tidak dikesan.
Jika, seperti yang @XFHNever katakan, ia adalah kerana dua biji daripada jenis yang sama dikonfigurasikan pada masa yang sama dan adalah mustahil untuk mengenal pasti yang mana satu Autowire Dalam kes ini, mesej pengecualian hendaklah:

org.springframework.beans.factory.NoUniqueBeanDefinitionException: Tiada jenis kacang yang layak
[org.springframework.data.mongodb.core.MongoTemplate] ditakrifkan:
menjangkakan kacang tunggal padanan tetapi menemui 2

Tekaan saya ialah fail konfigurasi mungkin tidak dibaca.

Answer 2

Ini mungkin kerana anda telah mengkonfigurasi dua MongoTemplate dalam fail konfigurasi, dan Spring tidak tahu yang mana satu harus dimuatkan Anda boleh mempertimbangkan untuk menggunakan @Autowired dan @Qualifier pada masa yang sama untuk menentukan MongoTemplate yang hendak dimuatkan.

PS:

1. @Resource dipasang dan disuntik mengikut nama secara lalai Hanya apabila kacang yang sepadan dengan nama tidak ditemui, ia akan dipasang dan disuntik mengikut jenis @Resource(name="studentDao")
2. @Autowired dikonfigurasikan dan disuntik mengikut jenis secara lalai Jika anda ingin memperuntukkan dan menyuntik mengikut nama, anda perlu menggunakannya bersama-sama dengan @Autowired @Qualifier("studentDao")
3. Anotasi @Resource disediakan oleh J2EE, dan @Autowired disediakan oleh Spring Oleh itu, disyorkan untuk menggunakan @Resource untuk mengurangkan pergantungan sistem pada

Answer 3

http://www.jianshu.com/p/6c82e6e21e5d
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