一：前提
在使用maven开发项目的过程中，经常会遇到jar包重复加载或者jar包冲突的问题的，但是由于有些jar是由于maven的依赖 加载自动加载进来的，而不是开发者自己配置的，特别是当项目中pom中配置的jar包依赖本身很多时，开发者靠自己的经验，有时很难找出是哪个jar的加载导致加载了多余的依赖jar，从而产生冲突。
二.解决方法：
目前我知道有两种解决方法，如下：
1：在pom.xml文件中，在Dependency Hierarchy（依赖列表）中查看jar包的依赖层次关系。查到相同jar包名称相同，版本不同的。可以右键自己不需要的jar包，选择 “Exclude”，然后保存pom.xml文件。这样就可以了。此时查看pom.xml文件，可以发现在对应的<dependency>中有了<exclusions>，如下
|
<dependency>
<groupId>com.github.pagehelper</groupId>
<artifactId>pagehelper-spring-boot-starter</artifactId>
<version>1.2.2</version>
<exclusions>
<exclusion>
<groupId>org.mybatis.spring.boot</groupId>
<artifactId>mybatis-spring-boot-starter</artifactId>
</exclusion>
</exclusions>
</dependency>
|
下面来看第二种方法
2.使用maven插件Maven Enforcer Plugin
使用方法：在pom.xml文件中直接引入即可，如下：
|
</project>
<build>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-enforcer-plugin</artifactId>
<version>1.3.1</version>
<executions>
<execution>
<id>enforce</id>
<configuration>
<rules>
<DependencyConvergence />
</rules>
</configuration>
<goals>
<goal>enforce</goal>
</goals>
</execution>
</executions>
</plugin>
</plugins>
</build>
</project>
|
然后执行maven命令 “validate”会打出日志告诉我们哪些jar包冲突。
|
[WARNING]
[WARNING] Some problems were encountered while building the effective settings
[WARNING] Unrecognised tag: 'id' (position: START_TAG seen ...<profiles>\n <id>... @199:8) @ D:\Apache\apache-maven-3.5.0\conf\settings.xml, line 199, column 8
[WARNING] Unrecognised tag: 'id' (position: START_TAG seen ...<profiles>\n <id>... @199:8) @ D:\Apache\apache-maven-3.5.0\conf\settings.xml, line 199, column 8
[WARNING]
[INFO] Scanning for projects...
[INFO]
[INFO] ------------------------------------------------------------------------
[INFO] Building test-spring-boot 0.0.1-SNAPSHOT
[INFO] ------------------------------------------------------------------------
[INFO]
[INFO] --- maven-enforcer-plugin:1.3.1:enforce (enforce) @ test-spring-boot ---
[WARNING]
Dependency convergence error for org.mybatis.spring.boot:mybatis-spring-boot-starter:1.3.1 paths to dependency are:
+-cn.com.chnsys:test-spring-boot:0.0.1-SNAPSHOT
+-org.mybatis.spring.boot:mybatis-spring-boot-starter:1.3.1
and
+-cn.com.chnsys:test-spring-boot:0.0.1-SNAPSHOT
+-com.github.pagehelper:pagehelper-spring-boot-starter:1.2.2
+-org.mybatis.spring.boot:mybatis-spring-boot-starter:1.3.0
[WARNING] Rule 0: org.apache.maven.plugins.enforcer.DependencyConvergence failed with message:
Failed while enforcing releasability the error(s) are [
Dependency convergence error for org.mybatis.spring.boot:mybatis-spring-boot-starter:1.3.1 paths to dependency are:
+-cn.com.chnsys:test-spring-boot:0.0.1-SNAPSHOT
+-org.mybatis.spring.boot:mybatis-spring-boot-starter:1.3.1
and
+-cn.com.chnsys:test-spring-boot:0.0.1-SNAPSHOT
+-com.github.pagehelper:pagehelper-spring-boot-starter:1.2.2
+-org.mybatis.spring.boot:mybatis-spring-boot-starter:1.3.0
]
[INFO] ------------------------------------------------------------------------
[INFO] BUILD FAILURE
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 3.833 s
[INFO] Finished at: 2018-05-22T15:51:01+08:00
[INFO] Final Memory: 15M/352M
[INFO] ------------------------------------------------------------------------
[ERROR] Failed to execute goal org.apache.maven.plugins:maven-enforcer-plugin:
1.3.1:enforce (enforce) on project test-spring-boot: Some Enforcer rules have failed. Look above for specific messages explaining why the rule failed. -> [Help 1]
[ERROR]
[ERROR] To see the full stack trace of the errors, re-run Maven with the -e switch.
[ERROR] Re-run Maven using the -X switch to enable full debug logging.
[ERROR]
[ERROR] For more information about the errors and possible solutions, please read the following articles:
[ERROR] [Help 1] http://cwiki.apache.org/confluence/display/MAVEN/MojoExecutionException
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这个方法，直接去右键Exclude不需要的版本即可。最好再去检查一下需要的jar包版本对不对
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版权声明：本文为博主原创文章，博客地址：https://blog.csdn.net/ChinaMuZhe，未经博主允许不得转载。