Agent disconnection when sending null data to API

Products

• CA Application Performance Management Agent (APM / Wily / Introscope)
• CA Application Performance Management (APM / Wily / Introscope)
• INTROSCOPE
• DX Application Performance Management

Issue/Introduction

Advice when developing a custom service for the agent to give an example of where it can cause the agent to disconnect from the Enterprise Manager

No disconnection was recorded during the first hour of running the agent

- with debug log we had this log message:
[DEBUG] [IntroscopeAgent.ConnectionThread] ConnectionThread caught throwable while sending data java.lang.NullPointerException

With more debug operation we finally found that :

- agent.IAgent_getDataAccumulatorFactory().safeGetStringEveryEventDataAccumulator(metricname).IStringEveryEventDataAccumulator_addString(sanitizedValue);

with a null value leads to an exception while sending data

The exception tries to close connection to server

 

Environment

Release : 10.7.0

Component : APM Agents

Resolution

The custom service code was verified to protect against a null value.