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commented on <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-905'>LOGBACK-905</a>
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<a style='color:#326ca6;text-decoration:none;' href='http://jira.qos.ch/browse/LOGBACK-905'><strong>SocketAppender is omitting CallerData</strong></a>
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<div class="comment-block" style="background-color:#edf5ff;border:1px solid #dddddd;color:#000000;padding:12px;"><p>I have done some investigation. SocketAppender is working separate thread. It calls getCallerData() method, which basically throws exception and tries to get caller information from a stack trace. In theory it should work, but SocketAppender is working in the another thread, so the stack trace is useless.</p>
<p>Here is creating new Throwable:</p>
<div class="code panel" style="border-width: 1px;"><div class="codeHeader panelHeader" style="border-bottom-width: 1px;"><b>LoggingEvent.java</b></div><div class="codeContent panelContent">
<pre class="code-java"> <span class="code-keyword">public</span> StackTraceElement[] getCallerData() {
<span class="code-keyword">if</span> (callerDataArray == <span class="code-keyword">null</span>) {
callerDataArray = CallerData.extract(<span class="code-keyword">new</span> Throwable(), fqnOfLoggerClass,
loggerContext.getMaxCallerDataDepth(), loggerContext.getFrameworkPackages());
}
<span class="code-keyword">return</span> callerDataArray;
}
</pre>
</div></div>
<p>Caller data iterate through StackTraceElements: <br/>
CallerData.java<br/>
```java</p>
<p> /**</p>
<ul>
<li>Extract caller data information as an array based on a Throwable passed as</li>
<li>parameter<br/>
*/<br/>
public static StackTraceElement[] extract(Throwable t,<br/>
String fqnOfInvokingClass, final int maxDepth,<br/>
List<String> frameworkPackageList) {<br/>
if (t == null)
{
return null;
}</li>
</ul>
<p> StackTraceElement[] steArray = t.getStackTrace();<br/>
StackTraceElement[] callerDataArray;</p>
<p> int found = LINE_NA;<br/>
for (int i = 0; i < steArray.length; i++) {<br/>
if (isInFrameworkSpace(steArray<span class="error">[i]</span>.getClassName(),<br/>
fqnOfInvokingClass, frameworkPackageList)) </p>
{
// the caller is assumed to be the next stack frame, hence the +1.
found = i + 1;
}
<p> else {<br/>
if (found != LINE_NA) </p>
{
break;
}
<p> }<br/>
}</p>
<p> // we failed to extract caller data<br/>
if (found == LINE_NA) </p>
{
return EMPTY_CALLER_DATA_ARRAY;
}
<p> int availableDepth = steArray.length - found;<br/>
int desiredDepth = maxDepth < (availableDepth) ? maxDepth : availableDepth;</p>
<p> callerDataArray = new StackTraceElement<span class="error">[desiredDepth]</span>;<br/>
for (int i = 0; i < desiredDepth; i++) </p>
{
callerDataArray[i] = steArray[found + i];
}
<p> return callerDataArray;<br/>
}</p>
<p> static boolean isInFrameworkSpace(String currentClass,<br/>
String fqnOfInvokingClass, List<String> frameworkPackageList) {<br/>
// the check for org.apache.log4j.Category class is intended to support<br/>
// log4j-over-slf4j. it solves <a href="http://bugzilla.slf4j.org/show_bug.cgi?id=66" class="external-link">http://bugzilla.slf4j.org/show_bug.cgi?id=66</a><br/>
if (currentClass.equals(fqnOfInvokingClass) || currentClass.equals(LOG4J_CATEGORY)</p>
<table class='confluenceTable'><tbody>
<tr>
<th class='confluenceTh'> currentClass.startsWith(SLF4J_BOUNDARY) </th>
<th class='confluenceTh'> isInFrameworkSpaceList(currentClass, frameworkPackageList))
{
return true;
}
<p> else </p>
{
return false;
}
<p> }<br/>
```</p></th>
</tr>
</tbody></table>
<p>If you check in debug what are the StackTraceElements:</p>
<p>```<br/>
ch.qos.logback.classic.spi.CallerData#extract<br/>
steArray = </p>
{java.lang.StackTraceElement[12]@1686}
<p> <br/>
0 = </p>
{java.lang.StackTraceElement@1687}
<p> "ch.qos.logback.classic.spi.LoggingEvent.getCallerData(LoggingEvent.java:262)"<br/>
1 = </p>
{java.lang.StackTraceElement@1688}
<p> "ch.qos.logback.classic.net.SocketAppender.postProcessEvent(SocketAppender.java:48)"<br/>
2 = </p>
{java.lang.StackTraceElement@1689}
<p> "ch.qos.logback.classic.net.SocketAppender.postProcessEvent(SocketAppender.java:34)"<br/>
3 = </p>
{java.lang.StackTraceElement@1690}
<p> "ch.qos.logback.core.net.AbstractSocketAppender.dispatchEvents(AbstractSocketAppender.java:230)"<br/>
4 = </p>
{java.lang.StackTraceElement@1691}
<p> "ch.qos.logback.core.net.AbstractSocketAppender.connectSocketAndDispatchEvents(AbstractSocketAppender.java:194)"<br/>
5 = </p>
{java.lang.StackTraceElement@1692}
<p> "ch.qos.logback.core.net.AbstractSocketAppender.access$000(AbstractSocketAppender.java:44)"<br/>
6 = </p>
{java.lang.StackTraceElement@1693}
<p> "ch.qos.logback.core.net.AbstractSocketAppender$1.run(AbstractSocketAppender.java:153)"<br/>
7 = </p>
{java.lang.StackTraceElement@1694}
<p> "java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)"<br/>
8 = </p>
{java.lang.StackTraceElement@1695}
<p> "java.util.concurrent.FutureTask.run(FutureTask.java:266)"<br/>
9 = </p>
{java.lang.StackTraceElement@1696}
<p> "java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)"<br/>
10 = </p>
{java.lang.StackTraceElement@1697}
<p> "java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)"<br/>
11 = </p>
{java.lang.StackTraceElement@1698}
<p> "java.lang.Thread.run(Thread.java:745)"<br/>
```</p></div>
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