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<img id="email-avatar" src="http://jira.qos.ch/secure/useravatar?avatarId=10122" alt="" height="48" width="48" border="0" align="left" style="padding:0;margin: 0 16px 16px 0;" />
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<a class="user-hover" rel="rgoldberg" id="email_rgoldberg" href="http://jira.qos.ch/secure/ViewProfile.jspa?name=rgoldberg" style="color:#326ca6;">Ross Goldberg</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-978'>LOGBACK-978</a>
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<a style='color:#326ca6;text-decoration:none;' href='http://jira.qos.ch/browse/LOGBACK-978'><strong>Configuration variable & literal parsing errors</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;">Affects Versions:</strong>
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1.1.2 </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;">Components:</strong>
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logback-core </td>
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<strong style="font-weight:normal;color:#505050;">Created:</strong>
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22/Apr/14 7:49 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 logback attempts to substitute values in for variables (of of the style $</p>
{...}
<p style='margin-top:0;margin-bottom:10px;'>) in the body of an element in logback.xml, if the body String ends with a dollar sign, '$', line 63 of ch.qos.logback.core.subst.Tokenizer performs:</p>
<p style='margin-top:0;margin-bottom:10px;'>throw new ScanException("Unexpected end of pattern string");</p>
<p style='margin-top:0;margin-bottom:10px;'>Which incorrectly throws a ScanException, because it is incorrectly expecting more characters, either a '{' to tell it to expect a variable name, or not a '{', to indicate that the '$' was a literal. If a '$' is the last character, obviously it is a literal instead of the beginning of a variable reference token.</p>
<p style='margin-top:0;margin-bottom:10px;'>Also, if the body String ends with "${", an NPE is thrown by some other method. Instead, my solution below throws a ScanException in this case (plus for the case where a "$</p>
{" is not closed by a "}
<p style='margin-top:0;margin-bottom:10px;'>").</p>
<p style='margin-top:0;margin-bottom:10px;'>Lastly, if the String includes unbalanced '</p>
{' without corresponding closing '}
<p style='margin-top:0;margin-bottom:10px;'>', your code throws exceptions elsewhere. Why must '</p>
{' be balanced by closing '}
<p style='margin-top:0;margin-bottom:10px;'>', if the '{' is not preceded by a '$'? My solution doesn't fix this issue, only the previous issues. Assuming my solution works for the earlier issues, however, it should be put into place, and the latter '{' issue can be handled later.</p>
<p style='margin-top:0;margin-bottom:10px;'>Solution (not tested or even compiled, so it might contain typos):<br/>
The body of the switch statement that include line 63 should probably be replaced with something like the following:</p>
<p style='margin-top:0;margin-bottom:10px;'>case LITERAL_STATE:<br/>
final int tokenCount = tokenList.size();<br/>
if (tokenCount >= 2 && tokenList.get(tokenCount - 2) == Token.START_TOKEN) {<br/>
throw new ScanException("variable reference open, \"$</p>
{\", without a variable reference close, \"}
<p style='margin-top:0;margin-bottom:10px;'>\" for variable name " + buf);<br/>
}<br/>
addLiteralToken(tokenList, buf);<br/>
break;<br/>
case START_STATE:<br/>
buf.append(CoreConstants.DOLLAR);<br/>
addLiteralToken(tokenList, buf);<br/>
break;</p>
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<strong style="font-weight:normal;color:#505050;">Environment:</strong>
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<p style='margin-top:0;margin-bottom:10px;'>All</p>
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<strong style="font-weight:normal;color:#505050;">Project:</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 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="rgoldberg" id="email_rgoldberg" href="http://jira.qos.ch/secure/ViewProfile.jspa?name=rgoldberg" style="color:#326ca6;">Ross Goldberg</a>
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