在使用IDE对JAVA项目导出为JAR包之后，JAR包被引用是报该错误，原因可能是log4j的版本问题。

java.lang.SecurityException: Invalid signature file digest for Manifest main attributes
    at sun.security.util.SignatureFileVerifier.processImpl(SignatureFileVerifier.java:240)
    at sun.security.util.SignatureFileVerifier.process(SignatureFileVerifier.java:193)
    at java.util.jar.JarVerifier.processEntry(JarVerifier.java:307)
    at java.util.jar.JarVerifier.update(JarVerifier.java:218)
    at java.util.jar.JarFile.initializeVerifier(JarFile.java:345)
    at java.util.jar.JarFile.getInputStream(JarFile.java:412)
    at sun.misc.JarIndex.getJarIndex(JarIndex.java:137)
    at sun.misc.URLClassPath$JarLoader$1.run(URLClassPath.java:674)
    at sun.misc.URLClassPath$JarLoader$1.run(URLClassPath.java:666)
    at java.security.AccessController.doPrivileged(Native Method)
    at sun.misc.URLClassPath$JarLoader.ensureOpen(URLClassPath.java:665)
    at sun.misc.URLClassPath$JarLoader.<init>(URLClassPath.java:638)
    at sun.misc.URLClassPath$3.run(URLClassPath.java:366)
    at sun.misc.URLClassPath$3.run(URLClassPath.java:356)
    at java.security.AccessController.doPrivileged(Native Method)
    at sun.misc.URLClassPath.getLoader(URLClassPath.java:355)
    at sun.misc.URLClassPath.getLoader(URLClassPath.java:332)
    at sun.misc.URLClassPath.getResource(URLClassPath.java:198)
    at java.net.URLClassLoader$1.run(URLClassLoader.java:358)
    at java.net.URLClassLoader$1.run(URLClassLoader.java:355)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.net.URLClassLoader.findClass(URLClassLoader.java:354)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:425)
    at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:308)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:358)
    at sun.instrument.InstrumentationImpl.loadClassAndStartAgent(InstrumentationImpl.java:300)
    at sun.instrument.InstrumentationImpl.loadClassAndCallPremain(InstrumentationImpl.java:397)
Exception in thread "main" 

但是这里提供一个简洁的方法

使用RAR文件打开JAR包，删除MATE-INF文件夹下

除了maven和MANIFEST.MF之外的所有文件。