java项目转 maven：

https://www.tianmaying.com/tutorial/eclipse-maven-project

java手动转 maven项目 ，右击项目 maven ->> update maven project –>> bug1:
error info
ref:https://stackoverflow.com/questions/10838109/eclipse-build-path-nesting-errors/15411137
原因是：pom.xml

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<build>
        <sourceDirectory>src</sourceDirectory>

把 src删除即可

Eclipse 报错如下

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org.apache.maven.archiver.MavenArchiver.getManifest(org.apache.maven.project.MavenProject, org.apache.maven.archiver.MavenArchiveConfiguration)
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<properties>        
    <maven-jar-plugin.version>2.6</maven-jar-plugin.version>
</properties>

参考link:https://stackoverflow.com/questions/37555557/m2e-error-in-mavenarchiver-getmanifest
Eclipse : Run As >> Maven clean >> Maven install