如何使用VIM + vjde?

afterain

到底这两个该怎么才能一起正常使用?
我的系统是windows XP pro
安装了vim7.0,ruby 1.8.2,java 1.4.2
把E:\Vim\vimfiles\plugin\vjde\vjde.jar加入了CLASSPATH环境变量
_vimrc相关的设置如下:
let g:vjde_cpp_exts='cpp;c;cxx;h;hpp;hxx'
set cfu=VjdeCompletionFun
ruby $java_command="javaw"
let g:vjde_java_command='javaw'
let g:vjde_show_paras=1
let g:vjde_cfu_java_para=1
let g:vjde_javadoc_path='E:\java\j2sdk\docs\api\'
let g:vjde_preview_gui=1

我打开一个java文件,在import java后面输入"."后,一个对话框弹出来提示:
Could not find the main class. Program will exit.
但是可以弹出perview的窗口
在函数中定义一个String str; str后面输入".",也有同样的提示,而且开了一个新窗口显示如下信息:
Error detected while processing function VjdePreviewCFU..VjdeCompletionFun0..VjdeCompletionFun..<SNR>15_VjdeJavaCompletionFun..<SNR>15_VjdeComple
tionByVIM..VjdeJavaCompletion_FindClass..VjdeListStringToList:
line   19:
E121: Undefined variable: java
E121: Undefined variable: at
E121: Undefined variable: at
E121: Undefined variable: at
E121: Undefined variable: at
E121: Undefined variable: at
E121: Undefined variable: at
E121: Undefined variable: at
E121: Undefined variable: at
E121: Undefined variable: at
E121: Undefined variable: at
E121: Undefined variable: at
E121: Undefined variable: at
E121: Undefined variable: Exception

删除后,然后我又重新在输入".",Vim就死了!只有强制关闭.