appinsights java custom metric not working

In a sample Java web application I tried to insert custom metric but not seeing in the AppInsights metric explorer nor Customevents table. I see the following error in the console window.

Configuration file has been successfully found in: 'C:\Users...\WebAppCopy\WEB-INF\lib\ApplicationInsights.xml' AI: ERROR 08-01-2017 18:14, 14: Failed to create empty class name AI: ERROR 08-01-2017 18:14, 14: Failed to create DeadLockDetector, exception: null AI: ERROR 08-01-2017 18:14, 14: Failed to create JvmHeapMemoryUsedPerformanceCounter, exception: null Jan 08, 2017 6:14:48 PM org.apache.coyote.AbstractProtocol start