为什么我的无法安装，提示如下，我的JAVA都安装了。CrossFTP客户端都能正常运行！
启动文件：
<?xml version="1.0" encoding="utf-8"?>
<jnlp
spec="1.0+"
codebase="
http://www.crossftp.com/"
href="crossftpserver.jnlp">
<information>
<title>CrossFTP Server</title>
<vendor>Crossworld, Inc.</vendor>
<homepage href="index.htm"/>
<description>CrossFTP Server, a professional FTP Server</description>
<description kind="short">CrossFTP Server is a professional ftp server for multiple platforms.</description>
<icon href="crossftpserver_logo_32_32.gif"/>
<icon kind="splash" href="logo_pane.jpg"/>
<offline-allowed/>
<!-- Prefer a shortcut for online operation -->
<shortcut online="false">
<desktop/>
<menu submenu="CrossFTP"/>
</shortcut>
</information>
<security>
<all-permissions/>
</security>
<resources>
<j2se version="1.4+"/>
<jar href="crossftpserver.jar"/>
<jar href="commons-logging.jar"/>
<property name="apple.laf.useScreenMenuBar" value="true"/>
<property name="com.apple.mrj.application.growbox.intrudes" value="false"/>
<property name="com.apple.mrj.application.live-resize" value="true"/>
<property name="com.apple.macos.smallTabs" value="true"/>
</resources>
<application-desc main-class="org.apache.ftpserver.gui.ServerFrame"/>
</jnlp>
异常：
java.lang.NullPointerException
at javax.swing.MultiUIDefaults.getUIError(MultiUIDefaults.java:117)
at javax.swing.UIDefaults.getUI(UIDefaults.java:736)
at javax.swing.UIManager.getUI(UIManager.java:1012)
at javax.swing.JPanel.updateUI(JPanel.java:109)
at javax.swing.JPanel.<init>(JPanel.java:69)
at javax.swing.JPanel.<init>(JPanel.java:92)
at javax.swing.JPanel.<init>(JPanel.java:100)
at javax.swing.JRootPane.createGlassPane(JRootPane.java:527)
at javax.swing.JRootPane.<init>(JRootPane.java:347)
at javax.swing.JFrame.createRootPane(JFrame.java:260)
at javax.swing.JFrame.frameInit(JFrame.java:241)
at javax.swing.JFrame.<init>(JFrame.java:164)
at org.apache.ftpserver.gui.ServerFrame.<init>(ServerFrame.java:268)
at org.apache.ftpserver.gui.ServerFrame.main(ServerFrame.java:569)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at com.sun.javaws.Launcher.executeApplication(Launcher.java:1205)
at com.sun.javaws.Launcher.executeMainClass(Launcher.java:1151)
at com.sun.javaws.Launcher.doLaunchApp(Launcher.java:998)
at com.sun.javaws.Launcher.run(Launcher.java:105)
at java.lang.Thread.run(Thread.java:619)
