Jetty9.x Unsupported major.minor version 51.0（jetty版本和jdk版本对照表）
Jetty9.x的错误提示：java.lang.UnsupportedClassVersionError: org/apache/nutch/crawl/Crawl3 : Unsupported major.minor version 51.0
at java.lang.ClassLoader.defineClass1(Native Method)
at java.lang.ClassLoader.defineClassCond(Unknown Source)
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.access$000(Unknown Source)
at java.net.URLClassLoader$1.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
Exception in thread "main"
解决问题
UnsupportedClassVersionError提示是jdk版本问题。
查找版本对应问题
jetty各个版本对应的jdk版本
http://blog.csdn.net/gao36951/article/details/45318315
1：jetty各个版本信息
版本号发布及维护年份托管平台JVM版本支持的协议servlet版本JSP版本目前状态9.32014Eclipse1.7HTTP/1.1, HTTP/2 RFC2616,javax.websocket, SPDY v33.12.3Experimental9.22014Eclipse1.7HTTP/1.1 RFC2616,javax.websocket, SPDY v33.12.3Stable82009-至今Eclipse/Codehaus1.6HTTP/1.1 RFC2616, WebSocket RFC 6455, SPDY v33.02.2Mature72008-至今Eclipse/Codehaus1.5HTTP/1.1 RFC2616, WebSocket RFC 6455, SPDY v32.52.1Mature62006-2010Codehaus1.4-1.5HTTP/1.1 RFC26162.52.0Venerable52003-2009Sourceforge1.2-1.5HTTP/1.1 RFC26162.42.0Deprecated42001-2006Sourceforge1.2，J2MEHTTP/1.1 RFC26162.31.2Ancient31999-2002Sourceforge1.2HTTP/1.1 RFC20682.21.1Fossilized21998-2000Mortbay1.1HTTP/1.0 RFC19452.11.0Legendary11995-1998Mortbay1.0HTTP/1.0 RFC1945––Mythical2：jdk编译器版本对应的数字版本号
jdk编译器版本十进制（minor.major）十六进制（minor.major ）1.85200 00 00 341.75100 00 00 331.65000 00 00 321.54900 00 00 311.44800 00 00 301.34700 00 00 2F1.24600 00 00 2E1.14500 00 00 2D
这里的版本号需要注意，看看上面的错误提示：Unsupported major.minor version 51.0
51对应的是jdk7（1.7）
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