[GitHub] [jmeter] KingRabbid opened a new issue, #6064: NPE when using sampler's HeaderManager in a loop

[via GitHub]

KingRabbid opened a new issue, #6064:
URL: https://github.com/apache/jmeter/issues/6064

   ### Expected behavior
   
   Using sampler.getHeaderManager() in a JSR223 PreProcessor attached to a HTTP 
Sampler returns current manager.
   When using this in a loop it should work.
   
   ### Actual behavior
   
   Using this in a Loop controller leads to retrieving a null manager from 
sampler upon 2nd iteration:
   ```
   2023-08-17 21:29:16,832 INFO o.a.j.m.J.JSR223 PreProcessor: sampler=class 
org.apache.jmeter.protocol.http.sampler.HTTPSamplerProxy
   2023-08-17 21:29:16,832 INFO o.a.j.m.J.JSR223 PreProcessor: 
headerManager=org.apache.jmeter.protocol.http.control.HeaderManager@6e58c5cf
   2023-08-17 21:29:16,851 INFO o.a.j.p.h.s.HTTPHC4Impl: HTTP request retry 
count = 0
   2023-08-17 21:29:16,950 INFO o.a.j.m.J.JSR223 PreProcessor: sampler=class 
org.apache.jmeter.protocol.http.sampler.HTTPSamplerProxy
   2023-08-17 21:29:16,950 INFO o.a.j.m.J.JSR223 PreProcessor: 
headerManager=null
   
   ```
   
   ### Steps to reproduce the problem
   
   Attached sample JMX to prove the point.
   
[jmeter_loop_http_header_manager.zip](https://github.com/apache/jmeter/files/12372587/jmeter_loop_http_header_manager.zip)
   
   
   ### JMeter Version
   
   5.6.2
   
   ### Java Version
   
   Oracle JDK 11.0.17+10-LTS-269
   
   ### OS Version
   
   Windows 11


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