Maven项目中突然找不到maven dependencies library

Posted 2020-10-05 不想下火车的人

　　这两天发现有个maven项目抽风了，开始是src/main/java下的包名加上最后的java目录名了，比如com.wulinfeng变成了java.com.wulinfeng，接着lib库没了，maven引入的依赖包导不了。后来发现是eclipse搞的鬼，出问题的是项目下的.classpath文件变动了。第一个问题我手动改了，第二个问题需要改动这个文件，先看改动前的样子

<?xml version="1.0" encoding="UTF-8"?>
<classpath>
    <classpathentry kind="src" output="target/classes" path="src/main/resources"/>
    <classpathentry kind="src" output="target/classes" path="src/test/java"/>
    <classpathentry kind="src" output="target/classes" path="src/main/java"/>
    <classpathentry kind="con" path="org.eclipse.jdt.launching.JRE_CONTAINER/org.eclipse.jdt.internal.debug.ui.launcher.StandardVMType/jdk1.8.0_131"/>
    <classpathentry kind="output" path="target/classes"/>
</classpath>

　　

　　改动后的样子

　

<?xml version="1.0" encoding="UTF-8"?>
<classpath>
    <classpathentry kind="src" output="target/classes" path="src/main/java">
        <attributes>
            <attribute name="optional" value="true"/>
            <attribute name="maven.pomderived" value="true"/>
        </attributes>
    </classpathentry>
    <classpathentry excluding="**" kind="src" output="target/classes" path="src/main/resources">
        <attributes>
            <attribute name="maven.pomderived" value="true"/>
        </attributes>
    </classpathentry>
    <classpathentry kind="src" output="target/test-classes" path="src/test/java">
        <attributes>
            <attribute name="optional" value="true"/>
            <attribute name="maven.pomderived" value="true"/>
        </attributes>
    </classpathentry>
    <classpathentry kind="src" path="src/test/resources"/>
    <classpathentry kind="con" path="org.eclipse.jdt.launching.JRE_CONTAINER/org.eclipse.jdt.internal.debug.ui.launcher.StandardVMType/JavaSE-1.8">
        <attributes>
            <attribute name="maven.pomderived" value="true"/>
        </attributes>
    </classpathentry>
    <classpathentry kind="con" path="org.eclipse.m2e.MAVEN2_CLASSPATH_CONTAINER">
        <attributes>
            <attribute name="maven.pomderived" value="true"/>
            <attribute name="org.eclipse.jst.component.dependency" value="/WEB-INF/lib"/>
        </attributes>
    </classpathentry>
    <classpathentry kind="output" path="target/classes"/>
</classpath>

　　

　　改好后重启Eclipse，Maven Dependecies终于又回来了。