报错显示如下：
Description Resource Path Location Type
The container 'Maven Dependencies' references non existing library 'C:\Users\CCai\.m2\repository\com\github\pagehelper\pagehelper\3.4.2-fix\pagehelper-3.4.2-fix.jar' roseonly-manager-dao Build path Build Path ProblemThe container 'Maven Dependencies' references non existing library 'C:\Users\CCai\.m2\repository\com\github\pagehelper\pagehelper\3.4.2-fix\pagehelper-3.4.2-fix.jar' roseonly-manager-service Build path Build Path Problem
The container 'Maven Dependencies' references non existing library 'C:\Users\CCai\.m2\repository\com\github\pagehelper\pagehelper\3.4.2-fix\pagehelper-3.4.2-fix.jar' roseonly-manager-web Build path Build Path Problem
Build path specifies execution environment JavaSE-1.7. There are no JREs installed in the workspace that are strictly compatible with this environment. roseonly-common Build path JRE System Library Problem
Build path specifies execution environment JavaSE-1.7. There are no JREs installed in the workspace that are strictly compatible with this environment. roseonly-manager-pojo Build path JRE System Library Problem
Description Resource
Path Location
Type
The project cannot be built until build path errors are resolved
roseonly-manager-dao Unknown
Java Problem
The project cannot be built until build path errors are resolved
roseonly-manager-service Unknown
Java Problem
The project cannot be built until build path errors are resolved
roseonly-manager-web Unknown
Java Problem
Description Resource
Path Location
Type
Missing artifact com.github.pagehelper:pagehelper:jar:3.4.2-fix
pom.xml /roseonly-manager-dao
line 30 Maven Dependency Problem
Missing artifact com.github.pagehelper:pagehelper:jar:3.4.2-fix
pom.xml /roseonly-manager-service
line 2 Maven Dependency Problem
Missing artifact com.github.pagehelper:pagehelper:jar:3.4.2-fix
pom.xml /roseonly-manager-web
line 2 Maven Dependency Problem
截图如下：
解决方法：
尽管报这么多的错，归根到底就是jar包的问题，只需要把<pagehelper.version>3.4.2-fix</pagehelper.version>改成<pagehelper.version>3.2.1</pagehelper.version>即可，ctrl+s进行保存，报错信息自会自动消失了。
截图如下：