Question

我正在尝试使用Eclipse的Web Start Plugin（http://webstart.sourceforge.net/）让Java Web Start处理应用程序。我尝试按照本教程进行操作，但是当我完成它并启动JNLP文件时，它失败并出现“应用程序错误”，并说“意外异常：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>

并且异常堆栈跟踪是：

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)

您正在ascllandgame.ASCLLand类的main()类的第16行中调用Scanner#next()。但是，没有更多可用的令牌，因此此调用将抛出此异常（根据链接的Javadoc;读取它）。您可能希望使用Scanner#hasNext()预先检查它。

您可以在此处找到基本的Sun tutorial about the subject。

无法让Java Web Start在Eclipse中工作

1 个答案: