After migrating Spectrum from Windows to Linux the OneClick WebApp does not finish loading

Products

• Network Observability
• Spectrum

Issue/Introduction

In the UAT environment the OneClick WebApp is working fine.

But in the production environment the OneClick WebApp does not finish loading.

In the $SPECROOT/webtomcat/bin/logs/webswing.log file:

2025-05-18 16:39:15,438 ERROR [https-jsse-nio-8443-exec-13] (AbstractSwingProcess.java:340) Failed to send event [launch] to application process oneclickwebapp_anonym_265a1dee5560_1747543155389
java.io.IOException: Failed to write to application's input stream. The application oneclickwebapp_anonym_265a1dee5560_1747543155389 may not be responding.

Caused by: java.util.concurrent.ExecutionException: java.lang.RuntimeException: java.io.IOException: Stream closed

Environment

DX NetOps Spectrum 23.3.9

Cause

While increasing the WebApp Client Memory Allocation in the $SPECROOT/webtomcat/webswing/webswing.config file from 1024 to 2048, a typo was introduced in the "vmArgs" section which lead to this problem.

Resolution

Add the missing "m" character. Edit the $SPECROOT/webtomcat/webswing/webswing.config file and change:

From:

"vmArgs" : "-Xmx2048 -Djavaws.cfg.jauthenticator=true -DbrowserIp=${clientIp} -Dsun.awt.noerasebackground=true -Dwebswing.swingSystemSelectionEnabled=false -Duser.timezone=${clientTimeZone} -Dtomcat.server.xml=${SPECROOT}/tomcat/conf/server.xml",

To:

"vmArgs" : "-Xmx2048m -Djavaws.cfg.jauthenticator=true -DbrowserIp=${clientIp} -Dsun.awt.noerasebackground=true -Dwebswing.swingSystemSelectionEnabled=false -Duser.timezone=${clientTimeZone} -Dtomcat.server.xml=${SPECROOT}/tomcat/conf/server.xml",

Then stop/start the WebTomcat service.

For your reference:

https://knowledge.broadcom.com/external/article?articleNumber=192748