SAP PI PO JAVA端 ESR ，ID 无法启动该应用程序

问题描述：

com.sun.deploy.net.FailedDownloadException: 无法加载资源: https://:/dir/directory/com.sap.xpi.ibdir.client.jar
    at com.sun.deploy.net.DownloadEngine.actionDownload(Unknown Source)
    at com.sun.deploy.net.DownloadEngine.downloadResource(Unknown Source)
    at com.sun.deploy.cache.ResourceProviderImpl.getResource(Unknown Source)
    at com.sun.deploy.cache.ResourceProviderImpl.getResource(Unknown Source)
    at com.sun.javaws.LaunchDownload$DownloadTask.call(Unknown Source)
    at java.util.concurrent.FutureTask.run(Unknown Source)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
    at java.lang.Thread.run(Unknown Source)

解决方案：

请确认在内网或已经登录VPN。
请BASIS或网络同事确认相关网络权限，端口等开通。
hosts 文件加入IP，域名映射。

相关SAP Note
1891480 - How to enable logging in Java WebStart console
https://launchpad.support.sap.com/#/notes/1891480

2416859 - PI tools fail to open: Message server not available
https://launchpad.support.sap.com/#/notes/2416859