异常：MissingFieldException[ 启动文件中缺少下列必需字段：<jnlp>(<application-desc>|<applet-desc>|<installer-desc>|<component-desc>)]
启动文件
- Java code
<?xml version="1.0" encoding="UTF-8"?> <!-- file Hello.jnlp --> <jnlp codebase="http://127.0.0.1:8081/test" href="test.jnlp"> <information> <title>Hello jackey</title> <vendor>jackey jiao Sample May 2004</vendor> <icon href="test.gif"/> <offline-allowed/></information> <resources> <j2se version="1.6"/> <jar href="test.jar"/> </resources> <security> <all-permissions></security><component-desc/><applet-desc/><installer-desc/><application-desc main-class="test"/> </jnlp>
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对比了一个官方样例：
http://docs.oracle.com/javase/tutorial/deployment/webstart/examplesIndex#DynamicTreeDemo
- XML code
<?xml version="1.0" encoding="UTF-8"?><jnlp spec="1.0+" codebase="http://docs.oracle.com/javase/tutorialJWS/deployment/webstart/ex6/webstart_ComponentArch_DynamicTreeDemo" href="dynamictree-webstart.jnlp"> <information> <title>Dynamic Tree Demo</title> <vendor>Dynamic Team</vendor> </information> <resources> <!-- Application Resources --> <j2se version="1.6+" href="http://java.sun.com/products/autodl/j2se"/> <jar href="DynamicTreeDemo.jar" main="true" /> </resources> <application-desc name="Dynamic Tree Demo Application" main-class="webstartComponentArch.DynamicTreeApplication"> </application-desc> <update check="background"/></jnlp>
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语法和样例：
http://docs.oracle.com/javase/7/docs/technotes/guides/javaws/developersguide/syntax
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在stackoverflow上，有人表示不同版本存在顺序问题：
http://stackoverflow.com/questions/8849535/creating-a-java-applet-exception-missing-jnlp-field
另外，建议用jnlp检查工具来进行详细检查：
http://pscode.org/janela/
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你本地命令行用：
javaws -wait xxx.jnlp
能正常启动么？
我修改了你的jnlp文件后，本机测试解析是正常的，但因为没部署所以找不到应用而已：
- XML code
<?xml version="1.0" encoding="UTF-8"?><jnlp codebase="http://127.0.0.1:8081/test" href="test.jnlp"> <information> <title>Hello jackey</title> <vendor>jackey jiao Sample May 2004</vendor> <icon href="test.gif"/> <offline-allowed/> </information> <resources> <j2se version="1.6"/> <jar href="test.jar"/> </resources> <security> <all-permissions/> </security> <component-desc/> <applet-desc/> <installer-desc/> <application-desc main-class="test"/></jnlp>
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我也是瞎子蒙象了。。。