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我正在使用 JarDiff+Pack200+Signed app/jars

我有需要 j2se 版本=1.6.0_16 的应用程序 v1.0 在第一次安装/下载后，我部署了需要 j2se 版本=1.7+ 的 v2.0

随机 jar 升级失败，出现空指针异常第二次尝试启动 v2 总是成功的。

我已经使用 java 1.6.0_16 和 7u7 从命令行对其进行了测试。任何想法是什么意思？

java.lang.NullPointerException
at com.sun.deploy.net.DownloadEngine.applyPatch(Unknown Source)
at com.sun.deploy.cache.CacheEntry.processTempDataFile(Unknown Source)
at com.sun.deploy.cache.Cache.downloadResourceToTempFile(Unknown Source)
at com.sun.deploy.cache.Cache.downloadResourceToCache(Unknown Source)
at com.sun.deploy.net.DownloadEngine.actionDownload(Unknown Source)
at com.sun.deploy.net.DownloadEngine._downloadCacheEntry(Unknown Source)
at com.sun.deploy.cache.ResourceProviderImpl.getResourceCacheEntry(Unknown Source)
at com.sun.deploy.cache.ResourceProviderImpl.getResourceCacheEntry(Unknown Source)
at com.sun.deploy.cache.ResourceProviderImpl.getResource(Unknown Source)
at com.sun.javaws.LaunchDownload$DownloadTask.call(Unknown Source)
at java.util.concurrent.FutureTask$Sync.innerRun(Unknown Source)
at java.util.concurrent.FutureTask.run(Unknown Source)
at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
at java.lang.Thread.run(Unknown Source)
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