Nexus启动报错：Unsupported major.minor version 51.0

Nexus启动报错： Unsupported major.minor version 51.0

1.遇到问题

   今天搭建Nexus私服，出现了以前没遇到过的错误。

    a).采用console-nexus.bat开启报错：

wrapper  | --> Wrapper Started as Console
wrapper  | Launching a JVM...
jvm 1    | java.lang.UnsupportedClassVersionError: org/sonatype/nexus/bootstrap/
jsw/JswLauncher : Unsupported major.minor version 51.0
jvm 1    |      at java.lang.ClassLoader.defineClass1(Native Method)
jvm 1    |      at java.lang.ClassLoader.defineClassCond(ClassLoader.java:631)
jvm 1    |      at java.lang.ClassLoader.defineClass(ClassLoader.java:615)
jvm 1    |      at java.security.SecureClassLoader.defineClass(SecureClassLoader
.java:141)
jvm 1    |      at java.net.URLClassLoader.defineClass(URLClassLoader.java:283)
jvm 1    |      at java.net.URLClassLoader.access$000(URLClassLoader.java:58)
jvm 1    |      at java.net.URLClassLoader$1.run(URLClassLoader.java:197)
jvm 1    |      at java.security.AccessController.doPrivileged(Native Method)
jvm 1    |      at java.net.URLClassLoader.findClass(URLClassLoader.java:190)
jvm 1    |      at java.lang.ClassLoader.loadClass(ClassLoader.java:306)
jvm 1    |      at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301)

jvm 1    |      at java.lang.ClassLoader.loadClass(ClassLoader.java:247)
jvm 1    | Could not find the main class: org.sonatype.nexus.bootstrap.jsw.JswLa
uncher.  Program will exit.
jvm 1    | Exception in thread "main"
wrapper  | JVM exited while loading the application.
wrapper  | Reloading Wrapper configuration...
wrapper  | Launching a JVM...

    b).采用install-nexus.bat、start-nexus.bat开启报错：

wrapper  | Starting the nexus service...
wrapper  | Waiting to start...
wrapper  | Waiting to start...
wrapper  | Waiting to start...
wrapper  | The nexus service was launched, but failed to start.

2.分析问题

   看日志的问题，大概就是版本存在问题，找不到Java虚拟机。

   Java版本：1.6.0_45

   Nexus版本： 2.7.2-03

   按照网上的办法是修改bin\jsw\conf\wrapper.conf中的wrapper.java.command

wrapper.java.command=C:\Lynch\Develop\Java\jdk1.6\bin\java.exe

   指向自己的jdk，似乎在特俗的Nexus版本可以解决，这里我还是不行。

   （事后经验补充：当console-nexus.bat方式启动正常，而将nexus设置为windows系统服务后，

       如果启动失败，按照此方法修改...报错提示：Unable to start the service - 系统找不到指定的文件。）

3.解决问题

   最终查询文档得到思路

Sonatype Nexus 2.6.0

Java 6 Support EOL
Oracle's support for Java 6 ended in February 2013.  Consequentially as of version 2.6 Nexus now requires a Java 7 JRE to run.

Sonatype Nexus OSS 2.5.0

Java 6 Support is Deprecated
Java 6 reached Official EOL on February 2013.  Since it is no longer receiving updates we are deprecating support for running Nexus with Java 6 in the 2.5 release, and will be removing it in the upcoming 2.6 release.

Sonatype Nexus 2.0 Release Notes

JDK 7 Support
Nexus 2.0 is the first version of Nexus verified to work with Java 7. The recommended versions are

Oracle 7u2 or later *
IBM Java 7.0 GA or later
* Note: Nexus 2.0 will not run on versions of Oracle Java 7 prior to 7u2.

When running with Java 6 the recommended versions are:

Oracle Java 6u30 or later
IBM Java 6.0.10.0 or Later

   a).Nexus的2.6版本及其以后版本

       使用的Java的jdk7.

   b).Nexus的2.0-2.5版本

       使用Java的jdk6的update30版本及其以后的jdk6版本

       使用Java的jdk7的update2版本及其以后jdk7版本

   c).最终解决方案

       升级jdk7（注意jdk的update版本，升级最新版本就可以）

4.参考文档

https://support.sonatype.com/entries/23150053-Sonatype-Nexus-Release-Notes?__utma=246996102.1501838135.1395215985.1395815367.1395822104.4&__utmb=246996102.21.9.1395822181403&__utmc=246996102&__utmx=-&__utmz=246996102.1395822104.4.4.utmcsr=google|utmccn=(organic)|utmcmd=organic|utmctr=(not%20provided)&__utmv=-&__utmk=14901813