ubuntu下tomcat运行不起来解决

报错
Neither the JAVA_HOME nor the JRE_HOME environment variable is defined
At least one of these environment variable is needed to run this program

Tomcat的startup.bat，它调用了catalina.bat,而catalina.bat则调用了setclasspath.bat。
只要在setclasspath.bat的开头声明环境变量，打开tomcat的bin目录下面的setclasspath.sh

export JAVA_HOME="/usr/java/jdk1.6.0_39"
export JRE_HOME="/usr/java/jdk1.6.0_39/jre"