无法获得Java Web Start的在Eclipse

Question

我试图获得Java Web Start的通过使用Web Start的Eclipse插件（http://webstart.sourceforge.net/）上的应用程序携手。我尝试以下教程，但是当我完成它，去启动JNLP文件，它与应用程序错误失败，他说“意外的异常：java.util.NoSuchElementException

显示的启动文件是：

<?xml version="1.0" encoding="UTF-8"?> 
<jnlp 
     codebase="file:/C:/Documents and Settings/10boyedevi/Desktop/School/AP Computer Science/Eclipse Workspace/ACSLLand/localhost/club/" href="file:/C:/Documents and Settings/10boyedevi/Desktop/School/AP Computer Science/Eclipse Workspace/ACSLLand/localhost/club/_local_club.jnlp"> 
     <information> 
       <title>ACSLLand</title> 
       <vendor>AP Comp Sci 2009-2010</vendor> 
       <description kind="default">A game.</description> 
     </information> 
     <security> 
       <all-permissions/> 
     </security> 
     <resources arch="x86" os="Windows"> 
       <j2se version="1.3+"/> 
       <jar href="ASCLLand.jar" main="true"/> 
     </resources> 
     <application-desc main-class="ascllandgame.ASCLLand"/> 
</jnlp> 

和异常堆栈跟踪是：

java.util.NoSuchElementException 
at java.util.Scanner.throwFor(Unknown Source) 
at java.util.Scanner.next(Unknown Source) 
at ascllandgame.ASCLLand.main(ASCLLand.java:16) 
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) 
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) 
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) 
at java.lang.reflect.Method.invoke(Unknown Source) 
at com.sun.javaws.Launcher.executeApplication(Unknown Source) 
at com.sun.javaws.Launcher.executeMainClass(Unknown Source) 
at com.sun.javaws.Launcher.doLaunchApp(Unknown Source) 
at com.sun.javaws.Launcher.run(Unknown Source) 
at java.lang.Thread.run(Unknown Source) 

Answer 1

java.util.NoSuchElementException 
at java.util.Scanner.throwFor(Unknown Source) 
at java.util.Scanner.next(Unknown Source) 
at ascllandgame.ASCLLand.main(ASCLLand.java:16) 

你在你的ascllandgame.ASCLLand的C线16调用Scanner#next() lass，在main()方法里面。但是，有没有其他的可用令牌，所以这个调用将抛出此异常（根据链接的Javadoc;阅读）。可能你想事先用Scanner#hasNext()进行检查。

您可以在这里找到一个基本Sun tutorial about the subject。