'version' contains an expression but should be a constant
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[WARNING] Some problems were encountered while building the effective model for com.app:cache:jar:4.0.0
[WARNING] \'version\' contains an expression but should be a constant. @ com.app:webapi:${myproject.version}, /usr/local/jenkins/webapi/pom.xml, line 8, column 14
[WARNING] Some problems were encountered while building the effective model for cy.nad.cyg:pay-web:war:3.0.2
[WARNING] \'version\' contains an expression but should be a constant. @ cy.nad.cyg:pay:${myproject.version}, D:\\workspace\\idea\\pay\\pom.xml, line 7, column 14
这是因为Maven3 不允许出现version为非常量值的情况，我们就需要第三方插件来帮我们自动完成升级版本的工作。
参见下文：
http://mojo.codehaus.org/versions-maven-plugin/examples/update-child-modules.html
这个插件等于只需要我们在parent pom中变更一下版本号，然后执行
mvn -N versions:update-child-modules这个命令，就会将所有依赖的地方全部变成新的版本号，从而帮我们完成该问题。
http://www.cnblogs.com/beiyeren/p/4275032.html
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