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<td style="vertical-align: top;; padding: 0; border-collapse: collapse; padding-right: 5px; font-size: 20px; line-height: 30px; mso-line-height-rule: exactly" class="page-title-pattern-header-container"> <span class="page-title-pattern-header" style="font-family: Arial, sans-serif; padding: 0; font-size: 20px; line-height: 30px; mso-text-raise: 2px; mso-line-height-rule: exactly; vertical-align: middle"> <a href="https://jira.qos.ch/browse/LOGBACK-1393" style="color: #3b73af; text-decoration: none">Re: The ch.qos.logback.core.rolling.helper.FileFilterUtil.afterLastSlash function may cause NPE problem</a> </span> </td>
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<td class="text-paragraph-pattern-container mobile-resize-text " style="padding: 0; border-collapse: collapse; padding: 0 0 10px"> <p style="margin: 10px 0 0; margin-top: 0"><a href="https://jira.qos.ch/secure/ViewProfile.jspa?name=JIANGBIAO" class="user-hover" rel="JIANGBIAO" style="color: #3b73af; text-decoration: none">Jiang Biao</a> Thank you for this report.</p> <p style="margin: 10px 0 0">It turns out that setting the triggering policy to SizeBasedTriggeringPolicy after setting the rollingPolicy to class <tt>ch.qos.logback.core.rolling.TimeBasedRollingPolicy</tt> is the root cause of the NPE. I have modified the code to generate a warning with a <a href="https://logback.qos.ch/codes.html#rfa_reset_rp_or_tp" class="external-link" target="_blank" rel="nofollow noopener" style="color: #3b73af; text-decoration: none">link to an explanation</a>. </p> <p style="margin: 10px 0 0">It is easy for forget that some rolling policies such as c.q.l.core.rolling.TimeBasedRollingPolicy and c.q.l.core.rolling.SizeAndTimeBasedRollingPolicy act as both a rolling policy and a trigerring policy.</p> <p style="margin: 10px 0 0">When the triggering policy is to SizeBasedTriggeringPolicy, then <tt>ch.qos.logback.core.rolling.TimeBasedRollingPolicy</tt> never calls {{<br> ch.qos.logback.core.rolling.DefaultTimeBasedFileNamingAndTriggeringPolicy#isTriggeringEvent}} method which leaves the elapsed file name null.</p> <p style="margin: 10px 0 0">Anyway, removing </p>
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<span class="code-tag" style="color: #000091"><triggeringPolicy class=<span class="code-quote" style="color: #009100">"ch.qos.logback.core.rolling.SizeBasedTriggeringPolicy"</span>></span>
<span class="code-tag" style="color: #000091"><MaxFileSize></span>10MB<span class="code-tag" style="color: #000091"></MaxFileSize></span>
<span class="code-tag" style="color: #000091"></triggeringPolicy></span>
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</div> <p style="margin: 10px 0 0">will solve the issue.</p> <p style="margin: 10px 0 0">If you wish to have size based trigerring in addition to time based trigerring/filenaming see <a href="https://logback.qos.ch/manual/appenders.html#SizeAndTimeBasedRollingPolicy" class="external-link" target="_blank" rel="nofollow noopener" style="color: #3b73af; text-decoration: none">SizeAndTimeBasedRollingPolicy</a> in the manual.</p> </td>
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