mavn 编译报错：
mavn sun.security.validator.ValidatorException: PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target
解决方案：
The fact is that your maven plugin try to connect to an https remote repository
(e.g https://repo.maven.apache.org/maven2/)
This is a new SSL connectivity for Maven Central was made available in august, 2014 !
So please, can you verify that your settings.xml has the correct configuration.
<settings> <activeProfiles> <!--make the profile active all the time --> <activeProfile>securecentral</activeProfile> </activeProfiles> <profiles> <profile> <id>securecentral</id> <!--Override the repository (and pluginRepository) "central" from the Maven Super POM --> <repositories> <repository> <id>central</id> <url>http://repo1.maven.org/maven2</url> <releases> <enabled>true</enabled> </releases> </repository> </repositories> <pluginRepositories> <pluginRepository> <id>central</id> <url>http://repo1.maven.org/maven2</url> <releases> <enabled>true</enabled> </releases> </pluginRepository> </pluginRepositories> </profile> </profiles> </settings>You can alternatively use the simple http maven repository like this
<pluginRepositories> <pluginRepository> <id>central</id> <name>Maven Plugin Repository</name> <url>http://repo1.maven.org/maven2</url> <layout>default</layout> <snapshots> <enabled>false</enabled> </snapshots> <releases> <updatePolicy>never</updatePolicy> </releases> </pluginRepository> </pluginRepositories>参考链接：https://stackoverflow.com/questions/25911623/problems-using-maven-and-ssl-behind-proxy