IDEA里运行代码时出现Caused by: java.lang.ClassNotFoundException: org.apache.log4j.Logger的解决办法（图文详解）

　　不多说，直接上干货！

 问题详情

　　运行出现log4j的问题

"C:Program FilesJavajdk1.8.0_66injava" -Didea.launcher.port=7533 "-Didea.launcher.bin.path=D:SoftWareIntelliJ IDEAIntelliJ IDEA Community Edition 2016.1.4in" -Dfile.encoding=UTF-8 -classpath "C:Program FilesJavajdk1.8.0_66jrelibcharsets.jar;C:Program FilesJavajdk1.8.0_66jrelibdeploy.jar;C:Program FilesJavajdk1.8.0_66jrelibextaccess-bridge-64.jar;C:Program FilesJavajdk1.8.0_66jrelibextcldrdata.jar;C:Program FilesJavajdk1.8.0_66jrelibextdnsns.jar;C:Program FilesJavajdk1.8.0_66jrelibextjaccess.jar;C:Program FilesJavajdk1.8.0_66jrelibextjfxrt.jar;C:Program FilesJavajdk1.8.0_66jrelibextlocaledata.jar;C:Program FilesJavajdk1.8.0_66jrelibext
ashorn.jar;C:Program FilesJavajdk1.8.0_66jrelibextsunec.jar;C:Program FilesJavajdk1.8.0_66jrelibextsunjce_provider.jar;C:Program FilesJavajdk1.8.0_66jrelibextsunmscapi.jar;C:Program FilesJavajdk1.8.0_66jrelibextsunpkcs11.jar;C:Program FilesJavajdk1.8.0_66jrelibextzipfs.jar;C:Program FilesJavajdk1.8.0_66jrelibjavaws.jar;C:Program FilesJavajdk1.8.0_66jrelibjce.jar;C:Program FilesJavajdk1.8.0_66jrelibjfr.jar;C:Program FilesJavajdk1.8.0_66jrelibjfxswt.jar;C:Program FilesJavajdk1.8.0_66jrelibjsse.jar;C:Program FilesJavajdk1.8.0_66jrelibmanagement-agent.jar;C:Program FilesJavajdk1.8.0_66jrelibplugin.jar;C:Program FilesJavajdk1.8.0_66jrelib
esources.jar;C:Program FilesJavajdk1.8.0_66jrelib
t.jar;D:CodeIntelliJIDEACodeHadoopSparkMllibAction	argetclasses;D:SoftWaremaven
epositoryorgscala-langscala-library2.10.4scala-library-2.10.4.jar;C:Program FilesJavajdk1.8.0_66jre..lib	ools.jar;D:SoftWareIntelliJ IDEAIntelliJ IDEA Community Edition 2016.1.4libidea_rt.jar" com.intellij.rt.execution.application.AppMain zhouls.bigdata.chapter10.RunWordCount
Exception in thread "main" java.lang.NoClassDefFoundError: org/apache/log4j/Logger
    at zhouls.bigdata.chapter10.RunWordCount$.main(RunWordCount.scala:12)
    at zhouls.bigdata.chapter10.RunWordCount.main(RunWordCount.scala)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:497)
    at com.intellij.rt.execution.application.AppMain.main(AppMain.java:144)
Caused by: java.lang.ClassNotFoundException: org.apache.log4j.Logger
    at java.net.URLClassLoader.findClass(URLClassLoader.java:381)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
    at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:331)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
    ... 7 more

Process finished with exit code 1

 解决办法

 　　在项目的pom.xml里添加如下的配置信息

<dependency>
      <groupId>log4j</groupId>
      <artifactId>log4j</artifactId>
      <version>1.2.16</version>
      <scope>compile</scope>
 </dependency>

 　　当然，这版本，大家也可以选择个最新的稳定版本，我这里仅仅是个参考。