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<a class="user-hover" rel="dtonhofer" id="email_dtonhofer" href="http://jira.qos.ch/secure/ViewProfile.jspa?name=dtonhofer" style="color:#326ca6;">David Tonhofer</a>
created <img src="http://jira.qos.ch/images/icons/bug.gif" height="16" width="16" border="0" align="absmiddle" alt="Bug"> <a style='color:#326ca6;text-decoration:none;' href='http://jira.qos.ch/browse/LOGBACK-779'>LOGBACK-779</a>
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<a style='color:#326ca6;text-decoration:none;' href='http://jira.qos.ch/browse/LOGBACK-779'><strong>Problematic logger name splitting via Logger.getSeparatorIndexOf()</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/bug.gif" 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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1.0.9 </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-classic </td>
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<strong style="font-weight:normal;color:#505050;">Created:</strong>
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20/Dec/12 6:57 PM
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<strong style="font-weight:normal;color:#505050;">Description:</strong>
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In the ch.qos.logback.classic.Logger class, the method getSeparatorIndexOf() is used to separate off child logger names (basically, to do String.split() on "name"). It looks for the occurrence of DOT or DOLLAR:
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static int getSeparatorIndexOf(String name, int fromIndex) {
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int i = name.indexOf(CoreConstants.DOT, fromIndex);
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if (i != -1) {
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return i;
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} else {
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return name.indexOf(CoreConstants.DOLLAR, fromIndex);
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}
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}
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---------------
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LoggerContext.getLogger() uses the above to split a passed "name" String.
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The logic, however is peculiar.
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getSeparatorIndexOf() splits a String along the DOT. Unless that is impossible,
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in which case it splits it along the DOLLAR.
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Unfortunately, LoggerContext.getLogger() may then behave surprisingly
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The name "A.B.C$D"
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will give the Logger chain A -> A.B -> A.B.C -> A.B.C.D as expected
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The name "A.B$C.D"
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could give the Logger chain A -> A.B -> A.B.C -> A.B.C.D but construction will
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fail! Because:
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Decomposition via getSeparatorIndexOf() will at first yield
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A , B$C , D
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But construction of a Logger in LoggerContext.getLogger() named "B$C" will then fail because that method checks whether decomposition is still possible; given "B$C" it will indeed find that decomposition is still possible, along the $ sign. It will thus throw an Exception.
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The problem occurs in case of Logger names like:
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"com.mplify.msgserver.ReceiverStickyPersistentStore$ReceiverStickyUpdateTransactionCallback.<clinit>"
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This was an acceptable name in logback 0.9.30 (my previous version) but causes an exception in 1.7.4
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Splitting should probably be done with a modified function:
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static int getSeparatorIndexOf(String name, int fromIndex) {
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int i = name.indexOf(CoreConstants.DOT, fromIndex);
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int j = name.indexOf(CoreConstants.DOLLAR, fromIndex);
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if (i < 0) {
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return j;
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}
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else if (j < 0) {
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return i;
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} else {
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return (i < j) ? i : j;
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}
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}
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which splits along DOT and DOLLAR.
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Problem with that approach:
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1) Properly recompositing the name from the logger chain will demand that one stores whether the preceding separator was a DOT or DOLLAR (on second thoughts, probably not, as the whole logger name is stored, not only the components)
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2) The names "A.B$C" and "A$B.C" would actually be equivalent. Would that be good?
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P.S. :
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Another problem: What about a logger "A..B"? Should
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Logger.createChildByName(final String childName)
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not check that is not passed the empty string? Currently it does not.
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<strong style="font-weight:normal;color:#505050;">Environment:</strong>
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Linux and Eclipse
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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;">Labels:</strong>
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logging
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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/priority_major.gif" 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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<a class="user-hover" rel="dtonhofer" id="email_dtonhofer" href="http://jira.qos.ch/secure/ViewProfile.jspa?name=dtonhofer" style="color:#326ca6;">David Tonhofer</a>
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