Maven项目右击Maven>Update project出现：
One or more constraints have not been satisfied. Spring 4.1 requires Java 1.6 or newer.或者Problems出现：
One or more constraints have not been satisfied. Dynamic Web Module 3.0 requires Java 1.6 or newer.可以在pom.xml项目中添加：
<profiles> <profile> <id>jdk-1.8</id> <!-- 另外一种激活方式 --> <activation> <activeByDefault>true</activeByDefault> <jdk>1.8</jdk> </activation> <properties> <maven.compiler.source>1.8</maven.compiler.source> <maven.compiler.target>1.8</maven.compiler.target> <maven.compiler.compilerVersion>1.8</maven.compiler.compilerVersion> </properties> </profile> </profiles>然后Maven项目右击Maven>Update project即可
