解决build path 中libraries为空

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检查.classpath 文件内容是否完整
如 :

<?xml version="1.0" encoding="UTF-8"?><classpath>    <classpathentry kind="src" path="src"/>    <classpathentry kind="con" path="org.eclipse.jdt.launching.JRE_CONTAINER/org.eclipse.jdt.internal.debug.ui.launcher.StandardVMType/jdk1.8.0_65">        <attributes>            <attribute name="owner.project.facets" value="java"/>        </attributes>    </classpathentry>    <classpathentry kind="con" path="org.eclipse.jst.server.core.container/org.eclipse.jst.server.tomcat.runtimeTarget/Apache Tomcat v8.0">        <attributes>            <attribute name="owner.project.facets" value="jst.web"/>        </attributes>    </classpathentry>    <classpathentry kind="con" path="org.eclipse.jst.j2ee.internal.web.container"/>    <classpathentry kind="con" path="org.eclipse.jst.j2ee.internal.module.container"/>    <classpathentry kind="output" path="build/classes"/></classpath>
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