java maven项目右键没有maven菜单问题

修改项目.project文件，确保有maven2Builder和maven2Nature2个标签：

<?xml version="1.0" encoding="UTF-8"?>

<projectDescription>

<name>projectName</name>

<comment></comment>

<projects>

</projects>

<buildSpec>

<buildCommand>

<name>org.eclipse.jdt.core.javabuilder</name>

<arguments>

</arguments>

</buildCommand>

<buildCommand>

<name>org.eclipse.m2e.core.maven2Builder</name>

<arguments>

</arguments>

</buildCommand>

</buildSpec>

<natures>

<nature>org.eclipse.jdt.core.javanature</nature>

<nature>org.eclipse.m2e.core.maven2Nature</nature>

</natures>

</projectDescription>
然后update Dependencies