问题现象：
org.openqa.selenium.SessionNotCreatedException: A new session could not be created. (Original error: Command failed:
java.util.zip.ZipException: error in opening zip file at java.util.zip.ZipFile.open(Native Method) at java.util.zip.ZipFile.<init>(Unknown Source)
at java.util.zip.ZipFile.<init>(Unknown Source) at java.util.jar.JarFile.<init>(Unknown Source) at java.util.jar.JarFile.<init>(Unknown Source)
at s.Sign.sign(Sign.java:441) at s.Sign.main(Sign.java:532))
解决方法：将JDK改为1.7即可。