轉：http://hybxiaodao.iteye.com/blog/1169168
你如果點中單獨一個文件，那麼那個選項一直都是反灰，只有你點中整個項目名，那個選項就可用了。
不是什麼版本問題
用myEclipse搭建hibernate框架後，有時搞亂了某些東西后，又想重新加載Hibernate包，但此時 addhibernate capabilities功能菜單竟然是灰色的，不可用，尤其是初學的朋友往往要重建web項目，一切都要重新來過。
其實大可不必這麼做。有個簡單的方法可以解決這個問題：
切換到java的導航試圖，在項目的根目錄下又個項目配置文件：".project"，打開後如下代碼所示。
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<?xml version="1.0"encoding="UTF-8"?>
<projectDescription>
<name>CourseMS</name>
<comment></comment>
<projects>
</projects>
<buildSpec>
<buildCommand>
<name>com.genuitec.eclipse.j2eedt.core.WebClasspathBuilder</name>
<arguments>
</arguments>
</buildCommand>
<buildCommand>
<name>org.eclipse.jdt.core.javabuilder</name>
<arguments>
</arguments>
</buildCommand>
<buildCommand>
<name>com.genuitec.eclipse.j2eedt.core.J2EEProjectValidator</name>
<arguments>
</arguments>
</buildCommand>
<buildCommand>
<name>com.genuitec.eclipse.j2eedt.core.DeploymentDescriptorValidator</name>
<arguments>
</arguments>
</buildCommand>
<buildCommand>
<name>org.eclipse.wst.validation.validationbuilder</name>
<arguments>
</arguments>
</buildCommand>
<buildCommand>
<name>com.genuitec.eclipse.hibernate.HibernateBuilder</name>
<arguments>
</arguments>
</buildCommand>
</buildSpec>
<natures>
<nature>com.genuitec.eclipse.hibernate.hibernatenature</nature>
<nature>com.genuitec.eclipse.j2eedt.core.webnature</nature>
<nature>org.eclipse.jdt.core.javanature</nature>
<nature>org.eclipse.wst.jsdt.core.jsNature</nature>
</natures>
</projectDescription>
<?xml version="1.0"encoding="UTF-8"?>
<projectDescription>
<name>CourseMS</name>
<comment></comment>
<projects>
</projects>
<buildSpec>
<buildCommand>
<name>com.genuitec.eclipse.j2eedt.core.WebClasspathBuilder</name>
<arguments>
</arguments>
</buildCommand>
<buildCommand>
<name>org.eclipse.jdt.core.javabuilder</name>
<arguments>
</arguments>
</buildCommand>
<buildCommand>
<name>com.genuitec.eclipse.j2eedt.core.J2EEProjectValidator</name>
<arguments>
</arguments>
</buildCommand>
<buildCommand>
<name>com.genuitec.eclipse.j2eedt.core.DeploymentDescriptorValidator</name>
<arguments>
</arguments>
</buildCommand>
<buildCommand>
<name>org.eclipse.wst.validation.validationbuilder</name>
<arguments>
</arguments>
</buildCommand>
<buildCommand>
<name>com.genuitec.eclipse.hibernate.HibernateBuilder</name>
<arguments>
</arguments>
</buildCommand>
</buildSpec>
<natures>
<nature>com.genuitec.eclipse.hibernate.hibernatenature</nature>
<nature>com.genuitec.eclipse.j2eedt.core.webnature</nature>
<nature>org.eclipse.jdt.core.javanature</nature>
<nature>org.eclipse.wst.jsdt.core.jsNature</nature>
</natures>
</projectDescription>
一般在最下方有：
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<buildCommand>
<name>com.genuitec.eclipse.hibernate.HibernateBuilder</name>
<arguments>
</arguments>
</buildCommand>
<buildCommand>
<name>com.genuitec.eclipse.hibernate.HibernateBuilder</name>
<arguments>
</arguments>
</buildCommand>
和
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<nature>com.genuitec.eclipse.hibernate.hibernatenature</nature>
<nature>com.genuitec.eclipse.hibernate.hibernatenature</nature>
將這兩段刪除即可
