Vmware+Ubuntu下配置Java环境，Tomcat出现问题 急！急！急！

[gigitim]

在Vmware下Ubuntu中配置Java+Tomcat+Eclipse开发环境,可是在配置的过程中遇到问题如下,望高手们多多指教.
Java是sun-java6,Java安装成功:因在终端输入java -version输出:
java version "1.6.0_07"
Java(TM) SE Runtime Environment (build 1.6.0_07-b06)
Java HotSpot(TM) Client VM (build 10.0-b23, mixed mode, sharing)

但是在配置Tomcat时出现问题:
root@gigitim-desktop:/usr/tomcat/apache-tomcat-6.0.18/bin# ./startup.sh
Using CATALINA_BASE: /usr/tomcat/apache-tomcat-6.0.18
Using CATALINA_HOME: /usr/tomcat/apache-tomcat-6.0.18
Using CATALINA_TMPDIR: /usr/tomcat/apache-tomcat-6.0.18/temp
Using JRE_HOME: /usr/lib/jvm/java-6-sun/jre

虽然输出没问题.但是在firefox中输入地址: http://localhost:8080后,却显示无法连接.
而且在./shutdown.sh后会出现如下异常：
root@gigitim-desktop:/usr/tomcat/apache-tomcat-6.0.18/bin# ./shutdown.sh
Using CATALINA_BASE: /usr/tomcat/apache-tomcat-6.0.18
Using CATALINA_HOME: /usr/tomcat/apache-tomcat-6.0.18
Using CATALINA_TMPDIR: /usr/tomcat/apache-tomcat-6.0.18/temp
Using JRE_HOME: /usr/lib/jvm/java-6-sun/jre
java.lang.ClassNotFoundException: org.apache.catalina.startup.Catalina
at java.net.URLClassLoader$1.run(URLClassLoader.java:200)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:188)
at java.lang.ClassLoader.loadClass(ClassLoader.java:306)
at java.lang.ClassLoader.loadClass(ClassLoader.java:251)
at org.apache.catalina.startup.Bootstrap.init(Bootstrap.java:215)
at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:390)
[ps]环境是Vmware下Ubuntu8.04,与主机XP通过NAT方式上网..

[cacate]

哈哈，我也郁闷着呀