業(yè)余在一個(gè)SpringBoot項(xiàng)目集成Swagger2時(shí)，啟動(dòng)過程一直出現(xiàn)以下報(bào)錯(cuò)信息——

An attempt was made to call a method that does not exist. The attempt was made from the following location:

springfox.documentation.schema.DefaultModelDependencyProvider.dependentModels(DefaultModelDependencyProvider.java:79)

The following method did not exist:

com.google.common.collect.FluentIterable.concat(Ljava/lang/Iterable;Ljava/lang/Iterable;)Lcom/google/common/collect/FluentIterable;

The method's class, com.google.common.collect.FluentIterable, is available from the following locations:

jar:file:/C:/Users/92493/.m2/repository/com/google/guava/guava/18.0/guava-18.0.jar!/com/google/common/collect/FluentIterable.class

The class hierarchy was loaded from the following locations:

com.google.common.collect.FluentIterable: file:/C:/Users/92493/.m2/repository/com/google/guava/guava/18.0/guava-18.0.jar

Action:

Correct the classpath of your application so that it contains a single, compatible version of com.google.common.collect.FluentIterable

出現(xiàn)這個(gè)問題，大概猜測到，應(yīng)該是Maven依賴沖突導(dǎo)致的，忽然想到，是否有可以檢查maven依賴沖突的插件呢，一查發(fā)現(xiàn)還真有，而且極方便。

這個(gè)Idea插件，叫Maven Helper，根據(jù)File -> Settings -> Plugins -> Marketplace 輸入Maven Helper即可找到。

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下載后，重啟IDEA，這時(shí)點(diǎn)擊pom.xml文件，會(huì)發(fā)現(xiàn)多了一欄【Dependency Analyzer】——

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切換至【Dependency Analyzer】欄，在搜索框輸入沖突包guava，即會(huì)出現(xiàn)，guava都被哪些包依賴了，當(dāng)多個(gè)組件包都依賴了同一個(gè)包但又不同版本時(shí)，很容易久出現(xiàn)各種沖突。紅色部分即是導(dǎo)致啟動(dòng)報(bào)異常的地方，可見，springfox-core已經(jīng)依賴的是20.0包，但其他還依賴18版本的包，這里可以把報(bào)錯(cuò)提示的18.0版本的通過exclusion去除即可。

image.png

選中對應(yīng)想去除的包，右擊即可一鍵exclusion——

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再切換至Text欄，即可發(fā)現(xiàn)已經(jīng)自動(dòng)增加了exclusions模塊——

<dependency>
    <groupId>io.shardingsphere</groupId>
    <artifactId>sharding-jdbc-spring-namespace</artifactId>
    <version>3.1.0</version>
    <exclusions>
        <exclusion>
            <artifactId>guava</artifactId>
            <groupId>com.google.guava</groupId>
        </exclusion>
    </exclusions>
</dependency>