Java 无法运行 selenium 独立服务器
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Unable to run selenium standalone server
提问by Smruti Singh
I am trying to run selenium-standalone-server 2.47.1.jar through command prompt.
我正在尝试通过命令提示符运行 selenium-standalone-server 2.47.1.jar。
But I am facing this error.
但我正面临这个错误。
C:\automation\node_modules\selenium-webdriver>java -jar selenium-server-standalo
ne-2.47.1.jar
Exception in thread "main" java.lang.UnsupportedClassVersionError: org/openqa/gr
id/selenium/GridLauncher : Unsupported major.minor version 51.0
at java.lang.ClassLoader.defineClass1(Native Method)
at java.lang.ClassLoader.defineClass(Unknown Source)
at java.security.SecureClassLoader.defineClass(Unknown Source)
at java.net.URLClassLoader.defineClass(Unknown Source)
at java.net.URLClassLoader.accessJ2SE 8 = 52,
J2SE 7 = 51,
J2SE 6.0 = 50,
J2SE 5.0 = 49,
JDK 1.4 = 48,
JDK 1.3 = 47,
JDK 1.2 = 46,
JDK 1.1 = 45
0(Unknown Source)
at java.net.URLClassLoader.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClassInternal(Unknown Source)
Could not find the main class: org.openqa.grid.selenium.GridLauncher. Program wi
ll exit.
C:\automation\node_modules\selenium-webdriver>
Why am I getting this error?
为什么我收到这个错误？
I have JDK installed already(since I need to run netbeans).
我已经安装了 JDK（因为我需要运行 netbeans）。
Is there anything I am missing?
有什么我想念的吗？
采纳答案by Esteban Herrera
java.lang.UnsupportedClassVersionErrorhappens because the code was compiled with a higher version of Java than the one you're running it.
java.lang.UnsupportedClassVersionError发生这种情况是因为代码是使用比您正在运行的 Java 版本更高的 Java 版本编译的。
Version 51.0 of a class file corresponds to java 7
类文件的 51.0 版本对应于 java 7
##代码##You need to upgrade your JDK from Java 6 to Java 7 or higher.
您需要将 JDK 从 Java 6 升级到 Java 7 或更高版本。
回答by Володимир Кузьменко
Just download the last JDK from http://www.oracle.com/technetwork/java/javase/downloads/jdk7-downloads-1880260.html
只需从http://www.oracle.com/technetwork/java/javase/downloads/jdk7-downloads-1880260.html下载最后一个 JDK
It helps me resolve the problem on my mac the problem was Exception in thread "main" java.lang.UnsupportedClassVersionError: org/openqa/grid/selenium/GridLauncher : Unsupported major.minor version 51.0
它帮助我解决了我的 mac 上的问题问题是线程“main”中的异常 java.lang.UnsupportedClassVersionError: org/openqa/grid/selenium/GridLauncher : Unsupported major.minor version 51.0
resolved by download and install Mac OS X x64 196.89 MB jdk-7u79-macosx-x64.dmg
通过下载并安装 Mac OS X x64 196.89 MB jdk-7u79-macosx-x64.dmg 解决
回答by Jalal
A colleague of mine tried to use selenium-java-2.48.2.jar where he got the same error:
我的一位同事尝试使用 selenium-java-2.48.2.jar ，但他遇到了同样的错误：
Exception in thread "main" java.lang.UnsupportedClassVersionError: org/openqa/grid/selenium/GridLauncher : Unsupported major.minor version 51.0 ```
线程“main”中的异常 java.lang.UnsupportedClassVersionError: org/openqa/grid/selenium/GridLauncher : Unsupported major.minor version 51.0 ```
I sent him an old version selenium-java-2.44.0.jar and now it works in his environment just fine.
我给他发送了一个旧版本的 selenium- java- 2.44.0.jar，现在它在他的环境中工作得很好。
