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<a class="user-hover" rel="thomas11" id="email_thomas11" href="http://jira.qos.ch/secure/ViewProfile.jspa?name=thomas11" style="color:#326ca6;">Thomas Kappler</a>
created <img src="http://jira.qos.ch/images/icons/issuetypes/improvement.png" height="16" width="16" border="0" align="absmiddle" alt="Improvement"> <a style='color:#326ca6;text-decoration:none;' href='http://jira.qos.ch/browse/LOGBACK-944'>LOGBACK-944</a>
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<a style='color:#326ca6;text-decoration:none;' href='http://jira.qos.ch/browse/LOGBACK-944'><strong>MDC.getCopyOfContextMap can return null, but MDC.setContextMap doesn't accept it</strong></a>
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<strong style="font-weight:normal;color:#505050;">Issue Type:</strong>
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<img src="http://jira.qos.ch/images/icons/issuetypes/improvement.png" height="16" width="16" border="0" align="absmiddle" alt="Improvement"> Improvement
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<strong style="font-weight:normal;color:#505050;">Affects Versions:</strong>
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<td style="color:#000000;font-family:Arial,FreeSans,Helvetica,sans-serif;font-size:12px;padding:0 0 10px 0;width:100%;">
1.0.13 </td>
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<strong style="font-weight:normal;color:#505050;">Assignee:</strong>
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<a class="user-hover" rel="logback-dev@qos.ch" id="email_logback-dev@qos.ch" href="http://jira.qos.ch/secure/ViewProfile.jspa?name=logback-dev%40qos.ch" style="color:#326ca6;">Logback dev list</a>
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<strong style="font-weight:normal;color:#505050;">Created:</strong>
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03/Feb/14 11:22 AM
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<strong style="font-weight:normal;color:#505050;">Description:</strong>
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<p style='margin-top:0;margin-bottom:10px;'>When using MDC and thread pools, code usually follows this pattern:</p>
<div class="preformatted panel" style="border-width: 1px;"><div class="preformattedContent panelContent">
<pre>final Map context = MDC.getCopyOfContextMap();
executor.submit(new Runnable() {
@Override
public void run() {
MDC.setContextMap(context);
}
</pre>
</div></div>
<p style='margin-top:0;margin-bottom:10px;'>But if no MDC variables are set, getCopyOfContextMap() returns null and setContextMap then blows up. LogbackMDCAdapter.setContextMap uses Map.putAll which doesn't accept null. Therefore, one has to wrap the call to setContextMap in an annoying null check.</p>
<p style='margin-top:0;margin-bottom:10px;'>I suggest that setContextMap should handle a null argument gracefully by returning early. Alternatively, return Collections.emptyMap() or similar from getCopyOfContextMap.</p>
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<strong style="font-weight:normal;color:#505050;">Project:</strong>
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<a style="color:#326ca6;" href="http://jira.qos.ch/browse/LOGBACK">logback</a>
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<strong style="font-weight:normal;color:#505050;">Priority:</strong>
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<td style="color:#000000;font-family:Arial,FreeSans,Helvetica,sans-serif;font-size:12px;padding:0 0 10px 0;width:100%;">
<img src="http://jira.qos.ch/images/icons/priorities/minor.png" height="16" width="16" border="0" align="absmiddle" alt="Minor"> Minor
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<strong style="font-weight:normal;color:#505050;">Reporter:</strong>
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<td style="color:#000000;font-family:Arial,FreeSans,Helvetica,sans-serif;font-size:12px;padding:0 0 10px 0;width:100%;">
<a class="user-hover" rel="thomas11" id="email_thomas11" href="http://jira.qos.ch/secure/ViewProfile.jspa?name=thomas11" style="color:#326ca6;">Thomas Kappler</a>
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