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List:       logback-dev
Subject:    [logback-dev] [JIRA] Updates for LOGBACK-1725: RollingFileAppender.start causes ConcurrentModificati
From:       "QOS.CH (JIRA)" <noreply-jira () qos ! ch>
Date:       2023-02-17 13:05:00
Message-ID: JIRA.16996.1676638234000.330.1676639100004 () Atlassian ! JIRA
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logback / LOGBACK-1725 [Open]
RollingFileAppender.start causes ConcurrentModificationException

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Here's what changed in this issue in the last few minutes.
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This issue is now assigned to you.

View or comment on issue using this link
https://jira.qos.ch/browse/LOGBACK-1725

==============================
 Issue created
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David Otto created this issue on 17/Feb/23 1:50 PM
Summary:              RollingFileAppender.start causes \
ConcurrentModificationException Issue Type:           Bug
Assignee:             Logback dev list
Created:              17/Feb/23 1:50 PM
Environment:
  In our application we add and remove appenders dynamically. We postpone the \
`.start()` call until the first messages arrives to avoid empty files.  
  There might be more than one thread calling start() on the same RFA
  
  We got this error:
  
   
  {code:java}
  java.util.ConcurrentModificationException: null
          at java.base/java.util.HashMap$HashIterator.nextNode(HashMap.java:1597)
          at java.base/java.util.HashMap$EntryIterator.next(HashMap.java:1630)
          at java.base/java.util.HashMap$EntryIterator.next(HashMap.java:1628)
          at ch.qos.logback.core.rolling.RollingFileAppender.innerCheckForFileNamePatternCollisionInPreviousRFA(RollingFileAppender.java:135)
                
          at ch.qos.logback.core.rolling.RollingFileAppender.checkForCollisionsInPreviousRollingFileAppenders(RollingFileAppender.java:121)
                
          at ch.qos.logback.core.rolling.RollingFileAppender.start(RollingFileAppender.java:62)
  {code}
   
  is RollingFileAppender.start() supposed to be thread safe?
Priority:             Major
Reporter:             David otto


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