java在带有jnlp文件的小程序中加载惰性jar时不能工作的原因是什么?
我在http页面中嵌入了小程序。小程序已经签名(和我正在使用的所有JAR一样),并且它使用了新的java插件,该插件允许在带有jnlp的网页中嵌入小程序。 我想延迟加载小程序所需的一个jar文件,但无法使其工作
这是我的jnlp文件:
<?xml version="1.0" encoding="UTF-8"?>
<jnlp spec="1.0+" href="/GUI.jnlp">
<information>
<title>My Applet</title>
<vendor>My Company</vendor>
</information>
<resources>
<j2se href="http://java.sun.com/products/autodl/j2se" version="1.6+"/>
<jar href="/mainGUI.jar" main="true"/>
<jar href="/external_1.jar"/>
<jar href="/external_2.jar"/>
<jar href="/external_3.jar" download="lazy"/>
</resources>
<applet-desc
name="My Applet"
main-class="com.xformation.GUIAppletMain"
width="800"
height="600">
</applet-desc>
</jnlp>
和html文件:
<APPLET width="100%" height="100%" name="My App" code="CompatibilityApplet" archive="mainGUI.jar">
<param name="jnlp_href" value="GUI.jnlp">
<script type="text/javascript">
<!--
document.write('<param name="server_address" value="' + window.location.href + '">');
//-->
</script>
</APPLET>
也在mainGUI中。jar文件我有ant生成的适当索引文件:
<target name="-do-jar-with-manifest" depends="compile">
<jar destfile="${dist.jar}" basedir="${build.classes.dir}" index="true">
<indexjars>
<fileset dir="libs">
<include name="**/external_1.jar"/>
<include name="**/external_2.jar"/>
<include name="**/external_3.jar"/>
</fileset>
</indexjars>
</jar>
</target>
从我看到的mainGUI。jar文件甚至没有被web浏览器作为第一个加载(实际上是最后一个),所以索引文件不能正确地用于检查应该下载哪些文件
知道我做错了什么吗
//编辑
java控制台的输出:
给你:
security: property package.access value sun.,com.sun.xml.internal.ws.,com.sun.xml.internal.bind.,com.sun.imageio.
security: property package.access new value sun.,com.sun.xml.internal.ws.,com.sun.xml.internal.bind.,com.sun.imageio.,com.sun.javaws
security: property package.access value sun.,com.sun.xml.internal.ws.,com.sun.xml.internal.bind.,com.sun.imageio.,com.sun.javaws
security: property package.access new value sun.,com.sun.xml.internal.ws.,com.sun.xml.internal.bind.,com.sun.imageio.,com.sun.javaws,com.sun.deploy
security: property package.access value sun.,com.sun.xml.internal.ws.,com.sun.xml.internal.bind.,com.sun.imageio.,com.sun.javaws,com.sun.deploy
security: property package.access new value sun.,com.sun.xml.internal.ws.,com.sun.xml.internal.bind.,com.sun.imageio.,com.sun.javaws,com.sun.deploy,com.sun.jnlp
security: property package.definition value null
security: property package.definition new value com.sun.javaws
security: property package.definition value com.sun.javaws
security: property package.definition new value com.sun.javaws,com.sun.deploy
security: property package.definition value com.sun.javaws,com.sun.deploy
security: property package.definition new value com.sun.javaws,com.sun.deploy,com.sun.jnlp
security: property package.access value sun.,com.sun.xml.internal.ws.,com.sun.xml.internal.bind.,com.sun.imageio.,com.sun.javaws,com.sun.deploy,com.sun.jnlp
security: property package.access new value sun.,com.sun.xml.internal.ws.,com.sun.xml.internal.bind.,com.sun.imageio.,com.sun.javaws,com.sun.deploy,com.sun.jnlp,org.mozilla.jss
security: property package.definition value com.sun.javaws,com.sun.deploy,com.sun.jnlp
security: property package.definition new value com.sun.javaws,com.sun.deploy,com.sun.jnlp,org.mozilla.jss
network: Created version ID: 1.6.0.26
network: Created version ID: 1.6
network: Created version ID: 1.6.0.26
network: Created version ID: 1.6
network: Created version ID: 1.6.0.26
network: Created version ID: 1.6
network: Created version ID: 1.6.0.26
network: Created version ID: 1.6
network: Connecting http://192.168.22.124:6500/mainGUI.jnlp with proxy=DIRECT
network: Connecting http://192.168.22.124:6500/ with proxy=DIRECT
network: ResponseCode for http://192.168.22.124:6500/mainGUI.jnlp : 200
network: Encoding for http://192.168.22.124:6500/mainGUI.jnlp : null
network: Sever response: (length: 703, lastModified: Thu Oct 27 13:12:43 CEST 2011, downloadVersion: null, mimeType: text/plain)
network: Downloading resource: http://192.168.22.124:6500/mainGUI.jnlp
Content-Length: 703
Content-Encoding: null
network: Wrote URL http://192.168.22.124:6500/mainGUI.jnlp to File C:\Users\pkukielka\AppData\LocalLow\Sun\Java\Deployment\cache\6.0\25\5cfa5999-21379497-temp
network: Disconnect connection to http://192.168.22.124:6500/mainGUI.jnlp
temp: new XMLParser with source:
temp: <?xml version="1.0" encoding="UTF-8"?>
<jnlp spec="1.0+" href="/mainGUI.jnlp">
<information>
<title>xxx</title>
<vendor>xxx</vendor>
</information>
<resources>
<j2se href="http://java.sun.com/products/autodl/j2se" version="1.6+"/>
<jar href="/swingx-core-1.6.2.jar"/>
<jar href="/jfreechart-1.0.13.jar"/>
<jar href="/axis.jar" download="lazy"/>
<jar href="/mainGUI.jar" download="eager" main="true"/>
</resources>
<applet-desc
name="LM-X Manager Applet"
main-class="com.company.mainGUIApplet"
width="800"
height="600">
</applet-desc>
</jnlp>
temp:
returning ROOT as follows:
<jnlp spec="1.0+" href="/mainGUI.jnlp">
<information>
<title>xxx</title>
<vendor>xxx</vendor>
</information>
<resources>
<j2se href="http://java.sun.com/products/autodl/j2se" version="1.6+"/>
<jar href="/swingx-core-1.6.2.jar"/>
<jar href="/jfreechart-1.0.13.jar"/>
<jar href="/axis.jar" download="lazy"/>
<jar href="/mainGUI.jar" download="eager" main="true"/>
</resources>
<applet-desc name="xxx" main-class="com.company.mainGUIApplet" width="800" height="600"/>
</jnlp>jnlp
temp: returning LaunchDesc from XMLFormat.parse():
<jnlp spec="1.0+" codebase="http://192.168.22.124:6500/" href="http://192.168.22.124:6500/mainGUI.jnlp">
<information>
<title>xxx</title>
<vendor>xxx</vendor>
<homepage href="null"/>
</information>
<update check="timeout" policy="always"/>
<resources>
<java href="http://java.sun.com/products/autodl/j2se" version="1.6+"/>
<jar href="http://192.168.22.124:6500/swingx-core-1.6.2.jar" download="eager" main="false"/>
<jar href="http://192.168.22.124:6500/jfreechart-1.0.13.jar" download="eager" main="false"/>
<jar href="http://192.168.22.124:6500/axis.jar" download="lazy" main="false"/>
<jar href="http://192.168.22.124:6500/mainGUI.jar" download="eager" main="true"/>
</resources>
<applet-desc name="xxx" main-class="com.company.mainGUIApplet" documentbase="http://192.168.22.124:6500/" width="800" height="600"/>
</jnlp>
basic: Plugin2ClassLoader.addURL2 called for http://192.168.22.124:6500/mainGUI.jar
basic: Plugin2ClassLoader.addURL2 called for http://192.168.22.124:6500/swingx-core-1.6.2.jar
basic: Plugin2ClassLoader.addURL2 called for http://192.168.22.124:6500/jfreechart-1.0.13.jar
basic: Plugin2ClassLoader.addURL2 called for http://192.168.22.124:6500/axis.jar
basic: Plugin2ClassLoader.drainPendingURLs addURL called for http://192.168.22.124:6500/mainGUI.jar
basic: Plugin2ClassLoader.drainPendingURLs addURL called for http://192.168.22.124:6500/swingx-core-1.6.2.jar
basic: Plugin2ClassLoader.drainPendingURLs addURL called for http://192.168.22.124:6500/jfreechart-1.0.13.jar
basic: Plugin2ClassLoader.drainPendingURLs addURL called for http://192.168.22.124:6500/axis.jar
network: No Custom Progress jar
network: Connecting http://192.168.22.124:6500/axis.jar with proxy=DIRECT
network: Downloading resource: http://192.168.22.124:6500/axis.jar
Content-Length: 1 972 163
Content-Encoding: null
security: Blacklist revocation check is enabled
network: LaunchDownload: concurrent downloads from LD: 4
network: Total size to download: -1
network: Connecting http://192.168.22.124:6500/jfreechart-1.0.13.jar with proxy=DIRECT
network: Connecting http://192.168.22.124:6500/swingx-core-1.6.2.jar with proxy=DIRECT
network: Connecting http://192.168.22.124:6500/mainGUI.jar with proxy=DIRECT
network: Connecting http://192.168.22.124:6500/ with proxy=DIRECT
network: Connecting http://192.168.22.124:6500/ with proxy=DIRECT
network: Downloading resource: http://192.168.22.124:6500/jfreechart-1.0.13.jar
Content-Length: 1 479 993
Content-Encoding: null
network: Validating http://192.168.22.124:6500/jfreechart-1.0.13.jar , version null...
network: Downloaded http://192.168.22.124:6500/jfreechart-1.0.13.jar: null
network: Download Progress: jarsDone: 1
network: Downloading resource: http://192.168.22.124:6500/mainGUI.jar
Content-Length: 881 140
Content-Encoding: null
network: Validating http://192.168.22.124:6500/mainGUI.jar , version null...
network: Downloaded http://192.168.22.124:6500/mainGUI.jar: null
network: Download Progress: jarsDone: 2
network: Downloading resource: http://192.168.22.124:6500/swingx-core-1.6.2.jar
Content-Length: 1 569 320
Content-Encoding: null
network: Validating http://192.168.22.124:6500/swingx-core-1.6.2.jar , version null...
network: Downloaded http://192.168.22.124:6500/swingx-core-1.6.2.jar: null
network: Download Progress: jarsDone: 3
network: Created version ID: 1.6+
network: Created version ID: 1.6.0.26
network: Created version ID: 1.6.0.26
network: Created version ID: 1.6
basic: LaunchDesc location: http://192.168.22.124:6500/mainGUI.jnlp
network: Created version ID: 1.0+
network: Created version ID: 6.0.18
basic: passing security checks; secureArgs:true, allSigned:false
basic: continuing launch in this VM
(...) <- here 500 lines with loaded classses listed, nothing form axis library
一个更新: 因为我用自己的web服务器运行这个示例,所以我用Debugger运行它,只需跳过应该延迟加载的服务库(我只返回了空文件)。 然后我得到了这个错误:
java.io.FileNotFoundException: http://192.168.22.124:6500/axis.jar?version-id=1.0
at sun.net.www.protocol.http.HttpURLConnection.getInputStream(Unknown Source)
at com.sun.deploy.net.DownloadEngine.getJarFileWithoutCache(Unknown Source)
at com.sun.deploy.net.DownloadEngine.getJarFileWithoutCache(Unknown Source)
at com.sun.deploy.net.DownloadEngine.getCachedJarFile(Unknown Source)
at com.sun.deploy.net.DownloadEngine.getCachedJarFile(Unknown Source)
at com.sun.javaws.LaunchDownload.downloadEagerorAll(Unknown Source)
at sun.plugin2.applet.JNLP2Manager.downloadResources(Unknown Source)
at sun.plugin2.applet.JNLP2Manager.prepareLaunchFile(Unknown Source)
at sun.plugin2.applet.JNLP2Manager.loadJarFiles(Unknown Source)
at sun.plugin2.applet.Plugin2Manager$AppletExecutionRunnable.run(Unknown Source)
at java.lang.Thread.run(Unknown Source)
我觉得很可疑的一句话是:
at com.sun.javaws.LaunchDownload.downloadEagerorAll(Unknown Source)
那么,看起来所有懒惰的下载都被忽略了?问题是为什么
# 1 楼答案
好吧,我找到答案了
看完 http://javasourcecode.org/html/open-source/jdk/jdk-6u23/com/sun/javaws/LaunchDownload.java.html我注意到这句话:
嗯,我确信我的缓存被清除了,因为在我的开发人员机器上,我完全禁用了它。出于好奇,我再次启用了它,并尝试运行我的小程序
它现在起作用了
所以:当心,延迟加载在禁用缓存的情况下不起作用
# 2 楼答案
您可能缺少codebase属性:
请参阅此处:http://download.oracle.com/javase/6/docs/technotes/guides/javaws/developersguide/syntax.html