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While setup New Relic Java agent in Jira, I found out that there is an extra option '-Datlassian.org.osgi.framework.bootdelegation.extra=com.newrelic.*' that you need to add into JVM parameters to make New Relic Java Agent to work with Jira. This is due to Jira uses OSGI framework, and the default boot class loader does not load the extra … Continue reading Use New Relic Java Agent with Jira
This is a real troubleshooting example that I just did yesterday for a high CPU usage java application. The application uses tomcat and runs on AWS EC2. Login into the box, and change to root user so you can see all users' process. sudo su - Install htop if you have not installed it before, the run it. … Continue reading Troubleshoot high CPU usage java process
It is a common practice to enable mutli-AZ when deploy RDS in AWS to provide high availability. That's not all. There is one more thing you need to check - DNS cache setting of your applications/codes. If you overlook it, the hight availability design may not work as you expect. Imagine that when RDS detects the failure … Continue reading Check DNS Cache when deploy Multi-AZ RDS
jnlp (java network launching protocal) is the Java Web Start file (also known as javaws). Many hardware devices' (switch,router, servers...) remote control utility uses this technology. For example Brocade fiber switch management page, Cisco ADSM, IBM X3650 IMM.remote control. When you visit the management page via Chrome or Firefox in Linux. The jnlp file will … Continue reading Run jnlp file in Linux
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