Question

以下应用程序与Java 1.7.0_05及更早版本完美配合：

<jnlp spec="1.0+" codebase="http://localhost/demo/">
    <information>
        <title>BPI 4.7</title>
        <vendor>Fox Technical Services Inc.</vendor>
        <homepage href="/home.html"/>
        <description>Fox Client</description>
        <description kind="short">Fox</description>
        <icon href="base/Fox64.gif" height="64" width="64"/>
    </information>
    <security>
        <all-permissions/>
    </security>
    <resources>
        <j2se href="http://java.sun.com/products/autodl/j2se" version="1.6+"/>
        <jar href="base/application.jar" main="true"/>
        <jar href="base/sessions.jar"/>
        <jar href="base/swingSessions.jar"/>
        <jar href="base/sharedClientServer.jar"/>
        <jar href="base/baseLookAndFeelNoDecorations.jar"/>
        <jar href="base/clientCommon2.jar"/>
        <jar href="base/httpProvider.jar"/>
        <jar href="base/swing.jar"/>
        <jar href="base/swingImages.jar"/>
        <jar href="base/glf.jar"/>
        <jar href="base/vnc.jar"/>
        <jar href="thirdPartyLib/TableLayout-bin-jdk1.5-2007-04-21.jar"/>
        <jar href="thirdPartyLib/dbswing.jar"/>
        <jar href="thirdPartyLib/dx.jar"/>
        <jar href="thirdPartyLib/beandt.jar"/>
        <jar href="thirdPartyLib/jnlp.jar"/>
        <jar href="thirdPartyLib/alloy.jar"/>
        <jar href="thirdPartyLib/commons-beanutils.jar"/>
        <jar href="thirdPartyLib/commons-collections-3.1.jar"/>
        <jar href="thirdPartyLib/commons-logging.jar"/>
        <jar href="thirdPartyLib/commons-codec-1.3.jar"/>
        <jar href="thirdPartyLib/commons-lang-2.0.jar" download="lazy"/>
        <jar href="thirdPartyLib/httpclient-4.0-beta2.jar"/>
        <jar href="thirdPartyLib/httpcore-4.0.jar"/>
        <jar href="thirdPartyLib/log4j-1.2.15.jar" download="lazy"/>
        <jar href="thirdPartyLib/jbcl.jar" download="lazy"/>
        <jar href="thirdPartyLib/mail-1.4.jar" download="lazy"/>
        <jar href="thirdPartyLib/activation-1.1.jar" download="lazy"/>
        <jar href="base/javolution.jar" download="lazy"/>
    </resources>
    <application-desc>
    </application-desc>
</jnlp>

当我尝试使用Java1.7.0_06和更新版本运行它时，我得到一个例外：

java.lang.NullPointerException
    at java.util.zip.ZipFile.<init>(Unknown Source)
    at java.util.jar.JarFile.<init>(Unknown Source)
    at java.util.jar.JarFile.<init>(Unknown Source)
    at com.sun.javaws.LaunchDownload.getMainClassName(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)

控制台日志是：

Java Web Start 10.7.2.11
Using JRE version 1.7.0_07-b11 Java HotSpot(TM) 64-Bit Server VM
User home directory = C:\Users\val
----------------------------------------------------
c:   clear console window
f:   finalize objects on finalization queue
g:   garbage collect
h:   display this help message
m:   print memory usage
o:   trigger logging
p:   reload proxy configuration
q:   hide console
r:   reload policy configuration
s:   dump system and deployment properties
t:   dump thread list
v:   dump thread stack
0-5: set trace level to <n>
----------------------------------------------------
Match: beginTraversal
Match: digest selected JREDesc: JREDesc[version 1.6+, heap=-1--1, args=null, href=http://java.sun.com/products/autodl/j2se, sel=false, null, null], JREInfo: JREInfo for index 0:
    platform is: 1.7
    product is: 1.7.0_07
    location is: http://java.sun.com/products/autodl/j2se
    path is: C:\Program Files\Java\jre7\bin\javaw.exe
    args is: null
    native platform is: Windows, amd64 [ x86_64, 64bit ]
    JavaFX runtime is: JavaFX 2.2.1 found at C:\Program Files\Java\jre7\
    enabled is: true
    registered is: true
    system is: true

    Match: ignoring maxHeap: -1
    Match: ignoring InitHeap: -1
    Match: digesting vmargs: null
    Match: digested vmargs: [JVMParameters: isSecure: true, args: ]
    Match: JVM args after accumulation: [JVMParameters: isSecure: true, args: ]
    Match: digest LaunchDesc: null
    Match: digest properties: []
    Match: JVM args: [JVMParameters: isSecure: true, args: ]
    Match: endTraversal ..
    Match: JVM args final: 
    Match: Running JREInfo Version    match: 1.7.0.07 == 1.7.0.07
     Match: Running JVM args match: have:<>  satisfy want:<>
#### Java Web Start Error:
#### null

非常感谢任何帮助！

Answer 1

你的application-desc元素是空的，这很奇怪。

根据jnlp-secification，它必须包含属性主要类。

<application-desc main-class="com.yourcompany.MyCoolApplication" />

使用Java 64位1.7.0_06 +从JNLP启动应用程序时出现NullPointerException

1 个答案: