我最近开始使用spring-boot开发一个Web应用程序，用于推荐StackOverflow数据集，但我是错误的。
pom.xml
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>io.spring.recommendation-engine</groupId>
<artifactId>recommendation_engine</artifactId>
<packaging>pom</packaging>
<version>1.0-SNAPSHOT</version>
<name>recommendation_engine</name>
<url>http://maven.apache.org</url>
<dependencyManagement>
<dependencies>
<dependency>
<groupId>io.spring.platform</groupId>
<artifactId>platform-bom</artifactId>
<version>1.0.1.RELEASE</version>
<type>pom</type>
<scope>import</scope>
</dependency>
</dependencies>
</dependencyManagement>
<modules>
<module>database-import</module>
<module>recommender-job</module>
<module>spark-import-job</module>
<module>spark-recommender-job</module>
<module>jdbchdfspartitioned</module>
<module>spring-overflow-spring</module>
</modules>
<repositories>
<repository>
<id>spring-snapshots</id>
<name>Spring Snapshots</name>
<url>http://repo.spring.io/snapshot</url>
<snapshots>
<enabled>true</enabled>
</snapshots>
</repository>
<repository>
<id>spring-milestones</id>
<name>Spring Milestones</name>
<url>http://repo.spring.io/milestone</url>
<snapshots>
<enabled>false</enabled>
</snapshots>
</repository>
</repositories>
<pluginRepositories>
<pluginRepository>
<id>spring-snapshots</id>
<url>http://repo.spring.io/libs-snapshot</url>
<snapshots><enabled>true</enabled></snapshots>
</pluginRepository>
</pluginRepositories>
</project>
Application.java
package io.spring.springoverflow;
import org.apache.mahout.cf.taste.impl.model.jdbc.MySQLBooleanPrefJDBCDataModel;
import org.apache.mahout.cf.taste.impl.recommender.AllSimilarItemsCandidateItemsStrategy;
import org.apache.mahout.cf.taste.impl.recommender.GenericItemBasedRecommender;
import org.apache.mahout.cf.taste.impl.similarity.jdbc.MySQLJDBCInMemoryItemSimilarity;
import org.apache.mahout.cf.taste.model.DataModel;
import org.apache.mahout.cf.taste.recommender.ItemBasedRecommender;
import org.apache.mahout.cf.taste.similarity.ItemSimilarity;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.EnableAutoConfiguration;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.ComponentScan;
import org.springframework.context.annotation.Configuration;
import javax.sql.DataSource;
@Configuration
@ComponentScan
@EnableAutoConfiguration
public class Application {
@Bean
ItemBasedRecommender recommender(DataSource dataSource) throws Exception {
DataModel dataModel = new MySQLBooleanPrefJDBCDataModel(dataSource);
ItemSimilarity similarity = new MySQLJDBCInMemoryItemSimilarity(dataSource);
AllSimilarItemsCandidateItemsStrategy candidateItemsStrategy =
new AllSimilarItemsCandidateItemsStrategy(similarity);
return new GenericItemBasedRecommender(dataModel, similarity, candidateItemsStrategy, candidateItemsStrategy);
}
public static void main(String[] args) {
SpringApplication.run(Application.class, args);
}
}
但是当我尝试使用java -jar appname运行应用程序时，我收到错误：
Error starting ApplicationContext. To display the auto-configuration report enabled debug logging (start with --debug)
2017-03-28 10:49:50.449 ERROR 2866 --- [ main] o.s.boot.SpringApplication : Application startup failed
org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'postController': Injection of autowired dependencies failed; nested exception is org.springframework.beans.factory.BeanCreationException: Could not autowire field: org.apache.mahout.cf.taste.recommender.ItemBasedRecommender io.spring.springoverflow.controller.PostController.recommender; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'recommender' defined in class io.spring.springoverflow.Application: Instantiation of bean failed; nested exception is org.springframework.beans.factory.BeanDefinitionStoreException: Factory method [org.apache.mahout.cf.taste.recommender.ItemBasedRecommender io.spring.springoverflow.Application.recommender(javax.sql.DataSource) throws java.lang.Exception] threw exception; nested exception is java.lang.NoClassDefFoundError: com/google/common/base/Preconditions
at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessPropertyValues(AutowiredAnnotationBeanPostProcessor.java:292)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1185)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:537)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:475)
at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:302)
at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:228)
at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:298)
at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:193)
at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:703)
at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:760)
at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:482)
at org.springframework.boot.context.embedded.EmbeddedWebApplicationContext.refresh(EmbeddedWebApplicationContext.java:120)
at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:691)
at org.springframework.boot.SpringApplication.run(SpringApplication.java:320)
at org.springframework.boot.SpringApplication.run(SpringApplication.java:952)
at org.springframework.boot.SpringApplication.run(SpringApplication.java:941)
at io.spring.springoverflow.Application.main(Application.java:52)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at org.springframework.boot.loader.MainMethodRunner.run(MainMethodRunner.java:53)
at java.lang.Thread.run(Thread.java:745)
Caused by: org.springframework.beans.factory.BeanCreationException: Could not autowire field: org.apache.mahout.cf.taste.recommender.ItemBasedRecommender io.spring.springoverflow.controller.PostController.recommender; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'recommender' defined in class io.spring.springoverflow.Application: Instantiation of bean failed; nested exception is org.springframework.beans.factory.BeanDefinitionStoreException: Factory method [org.apache.mahout.cf.taste.recommender.ItemBasedRecommender io.spring.springoverflow.Application.recommender(javax.sql.DataSource) throws java.lang.Exception] threw exception; nested exception is java.lang.NoClassDefFoundError: com/google/common/base/Preconditions
at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:508)
at org.springframework.beans.factory.annotation.InjectionMetadata.inject(InjectionMetadata.java:87)
at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessPropertyValues(AutowiredAnnotationBeanPostProcessor.java:289)
... 22 common frames omitted