下載了個apache-tomcat-8.0.5.zip免安裝壓縮包，解壓之后配置了CATALINA_HOME等等后啟動不了。

tomcat8啟動出現(xiàn)的錯誤log如下：

Using CATALINA_BASE:   "E:apache-tomcat-8.0.5"

Using CATALINA_HOME:   "E:apache-tomcat-8.0.5"

Using CATALINA_TMPDIR: "E:apache-tomcat-8.0.5 emp"

Using JRE_HOME:        "D:jdk1.6.0_31"

Using CLASSPATH:       "E:apache-tomcat-8.0.5inootstrap.jar;E:apache-tomcat-8.0.5in omcat-juli.jar"

Exception in thread "main" java.lang.UnsupportedClassVersionError: org/apache/catalina/startup/Bootstrap : Unsupported major.minor version 51.0

        at java.lang.ClassLoader.defineClass1(Native Method)

        at java.lang.ClassLoader.defineClassCond(ClassLoader.java:631)

        at java.lang.ClassLoader.defineClass(ClassLoader.java:615)

        at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:141)

        at java.net.URLClassLoader.defineClass(URLClassLoader.java:283)

        at java.net.URLClassLoader.access$000(URLClassLoader.java:58)

        at java.net.URLClassLoader$1.run(URLClassLoader.java:197)

        at java.security.AccessController.doPrivileged(Native Method)

        at java.net.URLClassLoader.findClass(URLClassLoader.java:190)

        at java.lang.ClassLoader.loadClass(ClassLoader.java:306)

        at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301)

        at java.lang.ClassLoader.loadClass(ClassLoader.java:247)

Heap

經(jīng)查詢此問題為java jdk和jre版本不同所致。猜測tomcat 8下部署的class是使用jdk 1.7編寫并編譯的，而我java_home中的jre為1.6版本的。所以就下載了一個1.7版本，將類編譯成jdk 1.7版本，問題解決。