Java开发网 - 这是什么意思？(java.lang.NoClassDefFoundError: Property)

Topic: 这是什么意思？(java.lang.NoClassDefFoundError: Property)

1.这是什么意思？(java.lang.NoClassDefFoundError: Property)	Copy to clipboard
Posted by: louning1 Posted on: 2005-04-17 21:03 请尽量用准确的文字描述作为标题 class Property is being used somewhere in your code. It may be missing from the classpath -- wrong/mispelled filename... Show us your code. Exception in thread "main" java.lang.NoClassDefFoundError: Property

2.Re:这是什么意思？(java.lang.NoClassDefFoundError: Property) [Re: louning1]	Copy to clipboard
Posted by: liujing319 Posted on: 2005-04-18 21:08 你的路径设置的不对 java.lang是一个程序包，是默认引入的，但是没找到这个包，说明你环境变量设置的有问题

3.Re:这是什么意思？(java.lang.NoClassDefFoundError: Property) [Re: liujing319]	Copy to clipboard
Posted by: why Posted on: 2005-04-18 21:14 liujing319 wrote: 你的路径设置的不对 java.lang是一个程序包，是默认引入的，但是没找到这个包，说明你环境变量设置的有问题 Please be careful when you try to answer a post. I think you don't mean it but it looks look it is about 没找到 java.lang 这个包.

4.Re:这是什么意思？(java.lang.NoClassDefFoundError: Property) [Re: louning1]

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Posted by: gonia
Posted on: 2005-04-19 21:36

是啊，到底是什么问题呢？
我最近也碰到这个问题了，用的是标准的helloworld.java
public class HelloWorld
{
  public static void main(String arg[])
  {
  System.out.println("Hello, World!");
  }
}

我的JAVA_HOME是：G:\BEA\jdk141_05
Path 是：G:\BEA\jdk141_05\bin;%SystemRoot%\system32;%SystemRoot%;%SystemRoot%\System32\Wbem;C:\Program Files\Microsoft SQL Server\80\Tools\BINN
CLASSPATH是：.;G:\BEA\jdk141_05\lib;G:\BEA\jdk141_05\lib\dt.jar;G:\BEA\jdk141_05\lib\tools.jar;C:\Program Files\Microsoft SQL Server 2000 Driver for JDBC\lib\msbase.jar;C:\Program Files\Microsoft SQL Server 2000 Driver for JDBC\lib\mssqlserver.jar;C:\Program Files\Microsoft SQL Server 2000 Driver for JDBC\lib\msutil.jar;G:\Borland\JBuilder2005\lib\jdsremote.jar
CLASSPATH前加了点，但是没用

然后就是以下错误：

5.Re:这是什么意思？(java.lang.NoClassDefFoundError: Property) [Re: louning1]	Copy to clipboard
Posted by: gonia Posted on: 2005-04-19 21:39 还有前面的javac是可以编译的：

6.Re:这是什么意思？(java.lang.NoClassDefFoundError: Property) [Re: louning1]	Copy to clipboard
Posted by: gonia Posted on: 2005-04-19 21:50 有的人说class名和文件大小写，其实是一致的，如下图：

7.Re:这是什么意思？(java.lang.NoClassDefFoundError: Property) [Re: louning1]	Copy to clipboard
Posted by: gonia Posted on: 2005-04-19 21:59 我觉得应该是环境变量有问题，weblogic和jbuilder的jdk在安装顺序或版本什么方面有些冲突，但是这些问题对于我这个初学者来说又难以发现和解决，希望各位前辈予以指教！ ps：我还装了sql server2000以及它的jdbc驱动，这个应该没什么影响吧？

8.Re:这是什么意思？(java.lang.NoClassDefFoundError: Property) [Re: louning1]	Copy to clipboard
Posted by: why Posted on: 2005-04-19 22:45 I can't tell what's happened, but let's try something simple: java -classpath . HelloWorld (. is the current directory)

9.Re:这是什么意思？(java.lang.NoClassDefFoundError: Property) [Re: louning1]	Copy to clipboard
Posted by: gonia Posted on: 2005-04-20 07:46 thank u very much ， i tried what said above and it did work well： but what's the problem about that？

10.Re:这是什么意思？(java.lang.NoClassDefFoundError: Property) [Re: louning1]

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Posted by: why
Posted on: 2005-04-20 08:44

Acutally I meant java -classpath . HelloWorld
and ". is the current directory" is just a note.

Personally I would try to avoid to include in the classpath folders with spaces in their names.
I would also try to make the classpath minimal and clean for a particular setup.

I'm don't know how you setup the environmental variables.
Maybe you could tell us how you do so, and run in Command Prompt
set >env.txt
and upload this env.txt for us to check.

11.Re:这是什么意思？(java.lang.NoClassDefFoundError: Property) [Re: louning1]

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Posted by: gonia
Posted on: 2005-04-20 19:22

the environmental variables of mine is posted at floor 4 ,

我的JAVA_HOME是：G:\BEA\jdk141_05
Path 是：G:\BEA\jdk141_05\bin;%SystemRoot%\system32;%SystemRoot%;%SystemRoot%\System32\Wbem;C:\Program Files\Microsoft SQL Server\80\Tools\BINN
CLASSPATH是：.;G:\BEA\jdk141_05\lib;G:\BEA\jdk141_05\lib\dt.jar;G:\BEA\jdk141_05\lib\tools.jar;C:\Program Files\Microsoft SQL Server 2000 Driver for JDBC\lib\msbase.jar;C:\Program Files\Microsoft SQL Server 2000 Driver for JDBC\lib\mssqlserver.jar;C:\Program Files\Microsoft SQL Server 2000 Driver for JDBC\lib\msutil.jar;G:\Borland\JBuilder2005\lib\jdsremote.jar

and i upload the env.txt as follows ,too

env.txt (1.01k)

12.Re:这是什么意思？(java.lang.NoClassDefFoundError: Property) [Re: gonia]

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Posted by: why
Posted on: 2005-04-20 20:14

gonia wrote:
the environmental variables of mine is posted at floor 4 ,
...
CLASSPATH是：.;G:\BEA\jdk141_05\lib;G:\BEA\jdk141_05\lib\dt.jar;G:\BEA\jdk141_05\lib\tools.jar;C:\Program Files\Microsoft SQL Server 2000 Driver for JDBC\lib\msbase.jar;C:\Program Files\Microsoft SQL Server 2000 Driver for JDBC\lib\mssqlserver.jar;C:\Program Files\Microsoft SQL Server 2000 Driver for JDBC\lib\msutil.jar;G:\Borland\JBuilder2005\lib\jdsremote.jar

From your env.txt
CLASSPATH=C:\Program Files\Altova\xmlspy\XMLSpyInterface.jar

13.Re:这是什么意思？(java.lang.NoClassDefFoundError: Property) [Re: louning1]	Copy to clipboard
Posted by: gonia Posted on: 2005-04-20 20:17 那是用户变量的classpath，上面的classpath我是设的系统变量，难道应该是用户变量？ Please try using the editing features. 我看书上写的是系统变量啊

14.Re:这是什么意思？(java.lang.NoClassDefFoundError: Property) [Re: louning1]	Copy to clipboard
Posted by: why Posted on: 2005-04-20 20:58 I don't know how you setup your 系统变量 and 用户变量 -- 用户变量 would inherits from and overrides 系统变量. This is your own problem. Anyway, it is suggested to use this form java - classpath [SPECIFIC_CLASSPATH] [CLASSNAME]

15.Re:这是什么意思？(java.lang.NoClassDefFoundError: Property) [Re: why]	Copy to clipboard
Posted by: gonia Posted on: 2005-04-20 21:13 why wrote: I don't know how you setup your 系统变量 and 用户变量 -- 用户变量 would inherits from and overrides 系统变量. really？then i should only setup 用户变量, right?

16.Re:这是什么意思？(java.lang.NoClassDefFoundError: Property) [Re: gonia]	Copy to clipboard
Posted by: why Posted on: 2005-04-20 21:35 gonia wrote: really？then i should only setup 用户变量, right? Haven't I made myself clear? It is suggested to use this form java - classpath [SPECIFIC_CLASSPATH] [CLASSNAME] I would keep the CLASSPATH on these 变量 minimal, perhaps just . only; and setup CLASSPATHs for individual programs.

17.Re:这是什么意思？(java.lang.NoClassDefFoundError: Property) [Re: why]	Copy to clipboard
Posted by: gonia Posted on: 2005-04-20 21:51 why wrote: and setup CLASSPATHs for individual programs. what does this mean? how ? set them in CLASSPATH , too ? and jdk only "." is enough?

18.Re:这是什么意思？(java.lang.NoClassDefFoundError: Property) [Re: why]	Copy to clipboard
Posted by: gonia Posted on: 2005-04-20 21:56 why wrote: 用户变量 would inherits from and overrides 系统变量. yes, i succeeded just use user variables ， thx again

19.Re:这是什么意思？(java.lang.NoClassDefFoundError: Property) [Re: gonia]	Copy to clipboard
Posted by: why Posted on: 2005-04-20 22:10 gonia wrote: what does this mean? how ? set them in CLASSPATH , too ? and jdk only "." is enough? 0. JDK doesn't even need the . 1. set up CLASSPATH, BUILD_PATH, or whatever within the GUI programs 2. Build batch files to set up the environment when using the Command Prompt or Terminal 3. Use Ant for development ...