java - 在ubuntu 10.10上安装jdk1.7.0

Question

我是 ubuntu 10.10 的新手，我将它用作 VM。我尝试安装 jdk 1.7 以从终端运行 java 程序。我按照链接中的说明进行操作:How to Install Oracle Java on Ubuntu Linux .安装完成后，我尝试测试运行一个 Hello World java 程序。当我执行 javac Hello.java 时程序编译成功。然而，当我尝试使用 java Hello 运行该程序时，它没有在终端上给出任何输出并给出以下内容:

Unable to launch the application.

异常(exception):

CouldNotLoadArgumentException[ Could not load file/URL specified: Hello]
at com.sun.javaws.Main.launchApp(Unknown Source)
at com.sun.javaws.Main.continueInSecureThread(Unknown Source)
at com.sun.javaws.Main$1.run(Unknown Source)
at java.lang.Thread.run(Thread.java:722)    

包装异常

java.io.FileNotFoundException: Hello (No such file or directory)
at java.io.FileInputStream.open(Native Method)
at java.io.FileInputStream.<init>(FileInputStream.java:138)
at java.io.FileInputStream.<init>(FileInputStream.java:97)
at com.sun.javaws.jnl.LaunchDescFactory.buildDescriptor(Unknown Source)
at com.sun.javaws.Main.launchApp(Unknown Source)
at com.sun.javaws.Main.continueInSecureThread(Unknown Source)
at com.sun.javaws.Main$1.run(Unknown Source)
at java.lang.Thread.run(Thread.java:722)

此外，我尝试使用 java -version 检查我的 java 版本，它给出了以下输出:

 Java(TM) Web Start 10.0.0.147-fcs 
Usage:  javaws [run-options] <jnlp-file>    
        javaws [control-options]        
    where run-options include:          
  -verbose          display additional output   
  -offline          run the application in offline mode 
  -system           run the application from the system cache only
  -Xnosplash        run without showing a splash screen 
  -J<option>        supply option to the vm 
  -wait             start java process and wait for its exit    

control-options include:    
  -viewer           show the cache viewer in the java control panel
  -clearcache       remove all non-installed applications from the cache
  -uninstall        remove all applications from the cache
  -uninstall <jnlp-file>                remove the application from the cache   
  -import [import-options] <jnlp-file>  import the application to the cache 

import-options include:                     
  -silent           import silently (with no user interface)    
  -system           import application into the system cache    
  -codebase <url>   retrieve resources from the given codebase  
  -shortcut         install shortcuts as if user allowed prompt 
  -association      install associations as if user allowed prompt

当我尝试使用 java 运行程序时，我在这里看到它使用了 javaws。

我不明白为什么会这样或出了什么问题。任何帮助将不胜感激。我只是 Ubuntu 的初学者。提前致谢!!

---

编辑 1你好.java:

public class Hello
{
    public static void main(String... s)
    {
        System.out.println("Hello World.!!!");
    }
}

Answer 1

您的输出来自 java -version给你 javaws -version 的输出。所以这似乎是您的文件系统中的链接错误。如果您使用 update-alternatives，您会在您的二进制文件夹 (/usr/bin) 中创建一个符号链接(symbolic link)。也许你在学习教程时有一些错字？我很确定这就像 sudo update-alternatives --install "/usr/bin/java" "java" "/usr/local/java/jre1.7.0_05/bin/javaws" 1或类似的东西。

您可以尝试重新输入“update-alternative”命令。