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MDC Servlet Filter, fix typos and be more specific when the MDC values are avaialbe #768

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MDC Servlet Filter, fix typos and be more specific when the MDC values are avaialbe #768

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073d607
Fix typo
csware Jan 19, 2024
faca52b
Small code optimization
csware Jan 19, 2024
b20d8e5
Be more specific when the value in the MDC is removed
csware Jan 19, 2024
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4 changes: 3 additions & 1 deletion logback-classic/src/main/java/ch/qos/logback/classic/helpers/MDCInsertingServletFilter.java
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Original file line number Diff line number Diff line change
Expand Up @@ -32,7 +32,9 @@
* request into the MDC.
* <p/>
* <p/>
* The values are removed after the request is processed.
* The values are removed after the all following
* filters/servlets have been processed. Note, however,
* the value is not available in an error handler servlet.
*
* @author Ceki G&uuml;lc&uuml;
*/
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11 changes: 6 additions & 5 deletions logback-examples/src/main/java/chapters/mdc/UserServletFilter.java
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Expand Up @@ -27,11 +27,12 @@
import org.slf4j.MDC;

/**
* A simple servlet filter that puts the username
* found either in the Principal.
* A simple servlet filter that stores the username
* found in the Principal in the MDC.
*
* <p> The value is removed from the MDC once the request has been
* fully processed.
* <p> The value is removed from the MDC once all following
* filters/servlets have been fully processed. Note, however,
* the value is not available in an error handler servlet.
*
* @author S&eacute;bastien Pennec
*/
Expand Down Expand Up @@ -74,7 +75,7 @@ public void init(FilterConfig arg0) throws ServletException {
* @return true id the user can be successfully registered
*/
private boolean registerUsername(String username) {
if (username != null && username.trim().length() > 0) {
if (username != null && !username.trim().isEmpty()) {
MDC.put(USER_KEY, username);
return true;
}
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