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<a class="user-hover" rel="wm" id="email_wm" href="http://jira.qos.ch/secure/ViewProfile.jspa?name=wm" style="color:#326ca6;">William Miller</a>
created <img src="http://jira.qos.ch/images/icons/issuetypes/bug.png" height="16" width="16" border="0" align="absmiddle" alt="Bug"> <a style='color:#326ca6;text-decoration:none;' href='http://jira.qos.ch/browse/LOGBACK-1099'>LOGBACK-1099</a>
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<a style='color:#326ca6;text-decoration:none;' href='http://jira.qos.ch/browse/LOGBACK-1099'><strong>SLF4J extensions relying on the LoggerWrapper class fail to log the exception on a parameterized query</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/bug.png" height="16" width="16" border="0" align="absmiddle" alt="Bug"> Bug
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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;">Attachments:</strong>
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demo.zip </td>
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<strong style="font-weight:normal;color:#505050;">Created:</strong>
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09/Sep/15 12:12 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 a logging statement occurs using an extending class, in my case, XLogger, with a parameterized query, on a LocationAwareLogger, the LoggerWrapper will use the MessageFormatter, format the message, and then pass it onto the bounded logger with null as the throwable. The MessageFormatter has already identified the exception, if applicable, and parsed it out of the object list. It has also generated an object list for the remaining objects. In my case, the underlying logged, log4j12, simply ignored the object list, used the formatted string, and saw null for the exception.</p>
<p style='margin-top:0;margin-bottom:10px;'>Attached is a very simple example (with pom and log4j.properties file) to demonstrate the problem. </p>
<div class="code panel" style="border-width: 1px;"><div class="codeHeader panelHeader" style="border-bottom-width: 1px;"><b>LoggerWrapperFailureDemo.java</b></div><div class="codeContent panelContent">
<pre class="code-java">
<span class="code-keyword">package</span> demo.slf4j.ext;
<span class="code-keyword">import</span> org.slf4j.Logger;
<span class="code-keyword">import</span> org.slf4j.LoggerFactory;
<span class="code-keyword">import</span> org.slf4j.ext.XLogger;
<span class="code-keyword">public</span> class LoggerWrapperFailureDemo
{
<span class="code-keyword">static</span> XLogger logger = <span class="code-keyword">new</span> XLogger(LoggerFactory.getLogger(LoggerWrapperFailureDemo.class));
<span class="code-keyword">static</span> Logger traditional = LoggerFactory.getLogger(LoggerWrapperFailureDemo.class);
<span class="code-keyword">public</span> <span class="code-keyword">static</span> void main( <span class="code-object">String</span>[] args )
{
Exception e = <span class="code-keyword">new</span> Exception(<span class="code-quote">"foo"</span>, <span class="code-keyword">new</span> Exception(<span class="code-quote">"bar"</span>));
logger.warn( <span class="code-quote">"No Param"</span>, e);
logger.warn( <span class="code-quote">"Param: {}"</span>, <span class="code-quote">"etc"</span>, e);
traditional.warn( <span class="code-quote">"No XLogger (So No LoggerWrapper {} "</span>, <span class="code-quote">"etc"</span>, e);
}
}
</pre>
</div></div>
<p style='margin-top:0;margin-bottom:10px;'>Here you will see the first (no parameter) and third (no loggerWrapper) log statements show the exception/stacktrace, however the second one fails.</p>
<p style='margin-top:0;margin-bottom:10px;'>Interestingly, this code was written in a way that worked for a couple of the debug functions, but had this problem in the majority of the LoggerWrapper class</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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<img src="http://jira.qos.ch/images/icons/priorities/major.png" height="16" width="16" border="0" align="absmiddle" alt="Major"> Major
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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="wm" id="email_wm" href="http://jira.qos.ch/secure/ViewProfile.jspa?name=wm" style="color:#326ca6;">William Miller</a>
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