App-system log error with path [/niku] threw exception

Products

• Clarity PPM On Premise

Issue/Introduction

Problem Statement: App-system log fills with below errors or even app services might not start
 
app-system log:2021/06/26 12:46:52.608 | SEVERE: Servlet.service() for servlet [default] in context with path [/niku] threw exception
2021/06/26 12:46:52.624 | java.lang.IllegalStateException: Cannot call sendError() after the response has been committed
2021/06/26 12:46:52.624 |  at org.apache.catalina.connector.ResponseFacade.sendError(ResponseFacade.java:472)
2021/06/26 12:46:52.639 |  at javax.servlet.http.HttpServletResponseWrapper.sendError(HttpServletResponseWrapper.java:129)
2021/06/26 12:46:52.655 |  at com.niku.union.web.filter.XSSFilter.doFilter(XSSFilter.java:123)

Cause

The probable causes are file level customization, could be keeping custom jar files under lib directory or keeping custom code under web root folder 

Environment

Release: All Supported release

Resolution

It is recommended to keep any custom jar files under a separate folder lets say custom lib and its never recommended to make changes under webroot folder as its protected now.