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<td class="text-paragraph-pattern-container mobile-resize-text " style="padding: 0px; border-collapse: collapse; padding: 0 0 10px 0"> <p style="margin: 10px 0 0 0; margin-top: 0">Not in form of unit test, but simple program.</p> <p style="margin: 10px 0 0 0"> </p>
<div class="code panel" style="border-width: 1px;; border: 1px solid #cccccc; background: #f5f5f5; font-size: 12px; line-height: 1.333; font-family: monospace; border: 1px solid #cccccc; -moz-border-radius: 3px 3px 3px 3px; border-radius: 3px 3px 3px 3px; margin: 9px 0">
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<pre class="code-java" style="margin: 10px 0 0 0; margin-top: 0; max-height: 30em; overflow: auto; white-space: pre-wrap; word-wrap: normal">
<span class="code-keyword" style="color: #000091">import</span> ch.qos.logback.classic.AsyncAppender;
<span class="code-keyword" style="color: #000091">import</span> ch.qos.logback.classic.Logger;
<span class="code-keyword" style="color: #000091">import</span> ch.qos.logback.classic.LoggerContext;
<span class="code-keyword" style="color: #000091">import</span> ch.qos.logback.classic.joran.JoranConfigurator;
<span class="code-keyword" style="color: #000091">import</span> ch.qos.logback.classic.spi.ILoggingEvent;
<span class="code-keyword" style="color: #000091">import</span> ch.qos.logback.core.Appender;
<span class="code-keyword" style="color: #000091">import</span> ch.qos.logback.core.joran.spi.JoranException;
<span class="code-keyword" style="color: #000091">import</span> ch.qos.logback.core.rolling.RollingFileAppender;
<span class="code-keyword" style="color: #000091">import</span> ch.qos.logback.core.util.StatusPrinter;
<span class="code-keyword" style="color: #000091">import</span> com.google.common.collect.ImmutableMultimap;
<span class="code-keyword" style="color: #000091">import</span> java.io.ByteArrayInputStream;
<span class="code-keyword" style="color: #000091">import</span> java.io.InputStreamReader;
<span class="code-keyword" style="color: #000091">import</span> java.io.PrintWriter;
<span class="code-keyword" style="color: #000091">import</span> java.sql.CallableStatement;
<span class="code-keyword" style="color: #000091">import</span> java.util.Iterator;
<span class="code-keyword" style="color: #000091">import</span> java.util.Map;
<span class="code-keyword" style="color: #000091">import</span> org.slf4j.LoggerFactory;
<span class="code-keyword" style="color: #000091">import</span> org.xml.sax.InputSource;
/**
* @author Stanislav Doktorovich
* @since 2017-05-19
*/
<span class="code-keyword" style="color: #000091">public</span> class LogbackNPE
{
<span class="code-keyword" style="color: #000091">private</span> <span class="code-keyword" style="color: #000091">static</span> void configureLogback()
{
<span class="code-comment" style="color: #808080">// assume SLF4J is bound to logback in the current environment
</span> LoggerContext context = (LoggerContext) LoggerFactory.getILoggerFactory();
<span class="code-keyword" style="color: #000091">try</span>
{
JoranConfigurator configurator = <span class="code-keyword" style="color: #000091">new</span> JoranConfigurator();
configurator.setContext(context);
<span class="code-comment" style="color: #808080">// Call context.reset() to clear any previous configuration, e.g. <span class="code-keyword" style="color: #000091; color: #808080">default</span>
</span> <span class="code-comment" style="color: #808080">// configuration. For multi-step configuration, omit calling context.reset().
</span> context.reset();
<span class="code-object" style="color: #910091">String</span> config = <span class="code-quote" style="color: #009100">"<configuration debug=\"</span><span class="code-keyword" style="color: #000091">false</span>\<span class="code-quote" style="color: #009100">" scan=\"</span><span class="code-keyword" style="color: #000091">false</span>\<span class="code-quote" style="color: #009100">">\n"</span> +
<span class="code-quote" style="color: #009100">" <appender name=\"</span>FILE\<span class="code-quote" style="color: #009100">" class=\"</span>ch.qos.logback.core.rolling.RollingFileAppender\<span class="code-quote" style="color: #009100">">\n"</span> +
<span class="code-quote" style="color: #009100">" <file>${prosrm.install.home}/log/1.log</file>\n"</span> +
<span class="code-quote" style="color: #009100">" <rollingPolicy class=\"</span>ch.qos.logback.core.rolling.TimeBasedRollingPolicy\<span class="code-quote" style="color: #009100">">\n"</span> +
<span class="code-quote" style="color: #009100">" <!-- daily rollover -->\n"</span> +
<span class="code-quote" style="color: #009100">" <fileNamePattern>${prosrm.install.home}/log/1.log.%d{yyyyMMdd}</fileNamePattern>\n"</span> +
<span class="code-quote" style="color: #009100">" <maxHistory>3</maxHistory>\n"</span> +
<span class="code-quote" style="color: #009100">" <totalSizeCap>1GB</totalSizeCap>\n"</span> +
<span class="code-quote" style="color: #009100">" </rollingPolicy>\n"</span> +
<span class="code-quote" style="color: #009100">" </appender>\n"</span> +
<span class="code-quote" style="color: #009100">" <root level=\"</span>INFO\<span class="code-quote" style="color: #009100">">\n"</span> +
<span class="code-quote" style="color: #009100">" <appender-ref ref=\"</span>FILE\<span class="code-quote" style="color: #009100">" />\n"</span> +
<span class="code-quote" style="color: #009100">" </root>\n"</span> +
<span class="code-quote" style="color: #009100">"</configuration>"</span>;
configurator.doConfigure(<span class="code-keyword" style="color: #000091">new</span> ByteArrayInputStream(config.getBytes()));
}
<span class="code-keyword" style="color: #000091">catch</span> (JoranException je)
{
<span class="code-comment" style="color: #808080">// StatusPrinter will handle <span class="code-keyword" style="color: #000091; color: #808080">this</span>
</span> }
StatusPrinter.printInCaseOfErrorsOrWarnings(context);
}
<span class="code-keyword" style="color: #000091">private</span> <span class="code-keyword" style="color: #000091">static</span> void npe() <span class="code-keyword" style="color: #000091">throws</span> Exception
{
<span class="code-comment" style="color: #808080">// assume SLF4J is bound to logback in the current environment
</span> LoggerContext loggerContext = (LoggerContext) LoggerFactory.getILoggerFactory();
Logger logger = loggerContext.getLogger(org.slf4j.Logger.ROOT_LOGGER_NAME);
rollover(logger.iteratorForAppenders());
}
<span class="code-keyword" style="color: #000091">private</span> <span class="code-keyword" style="color: #000091">static</span> void rollover(Iterator<Appender<ILoggingEvent>> it)
{
<span class="code-keyword" style="color: #000091">for</span> (; it.hasNext(); )
{
Appender<ILoggingEvent> appender = it.next();
<span class="code-keyword" style="color: #000091">if</span> (appender <span class="code-keyword" style="color: #000091">instanceof</span> RollingFileAppender)
{
RollingFileAppender rollingFileAppender = (RollingFileAppender) appender;
rollingFileAppender.rollover();
}
<span class="code-keyword" style="color: #000091">else</span> <span class="code-keyword" style="color: #000091">if</span> (appender <span class="code-keyword" style="color: #000091">instanceof</span> AsyncAppender)
{
AsyncAppender asyncAppender = (AsyncAppender) appender;
rollover(asyncAppender.iteratorForAppenders());
}
}
}
<span class="code-keyword" style="color: #000091">public</span> <span class="code-keyword" style="color: #000091">static</span> void main(<span class="code-object" style="color: #910091">String</span>[] args) <span class="code-keyword" style="color: #000091">throws</span> Exception
{
configureLogback();
npe();
}
}
</pre>
</div>
</div> <p style="margin: 10px 0 0 0">output:</p>
<div class="code panel" style="border-width: 1px;; border: 1px solid #cccccc; background: #f5f5f5; font-size: 12px; line-height: 1.333; font-family: monospace; border: 1px solid #cccccc; -moz-border-radius: 3px 3px 3px 3px; border-radius: 3px 3px 3px 3px; margin: 9px 0">
<div class="codeContent panelContent" style="padding: 9px 12px">
<pre class="code-java" style="margin: 10px 0 0 0; margin-top: 0; max-height: 30em; overflow: auto; white-space: pre-wrap; word-wrap: normal">
Exception in thread <span class="code-quote" style="color: #009100">"main"</span> java.lang.NullPointerException
at ch.qos.logback.core.rolling.helper.FileFilterUtil.afterLastSlash(FileFilterUtil.java:46)
at ch.qos.logback.core.rolling.TimeBasedRollingPolicy.rollover(TimeBasedRollingPolicy.java:166)
at ch.qos.logback.core.rolling.RollingFileAppender.attemptRollover(RollingFileAppender.java:211)
at ch.qos.logback.core.rolling.RollingFileAppender.rollover(RollingFileAppender.java:190)
at LogbackNPE.rollover(LogbackNPE.java:79)
at LogbackNPE.npe(LogbackNPE.java:68)
at LogbackNPE.main(LogbackNPE.java:92)
20:46:11,222 |-INFO in ch.qos.logback.classic.LoggerContext[<span class="code-keyword" style="color: #000091">default</span>] - Could NOT find resource [logback-test.xml]
20:46:11,223 |-INFO in ch.qos.logback.classic.LoggerContext[<span class="code-keyword" style="color: #000091">default</span>] - Could NOT find resource [logback.groovy]
20:46:11,223 |-INFO in ch.qos.logback.classic.LoggerContext[<span class="code-keyword" style="color: #000091">default</span>] - Could NOT find resource [logback.xml]
20:46:11,228 |-INFO in ch.qos.logback.classic.BasicConfigurator@27abe2cd - Setting up <span class="code-keyword" style="color: #000091">default</span> configuration.
20:46:11,372 |-INFO in ch.qos.logback.classic.joran.action.ConfigurationAction - debug attribute not set
20:46:11,372 |-INFO in ch.qos.logback.core.joran.action.AppenderAction - About to instantiate appender of type [ch.qos.logback.core.rolling.RollingFileAppender]
20:46:11,381 |-INFO in ch.qos.logback.core.joran.action.AppenderAction - Naming appender as [FILE]
20:46:11,408 |-INFO in c.q.l.core.rolling.TimeBasedRollingPolicy@1599771323 - setting totalSizeCap to 1 GB
20:46:11,424 |-INFO in c.q.l.core.rolling.TimeBasedRollingPolicy@1599771323 - No compression will be used
20:46:11,426 |-INFO in c.q.l.core.rolling.TimeBasedRollingPolicy@1599771323 - Will use the pattern prosrm.install.home_IS_UNDEFINED/log/1.log.%d{yyyyMMdd} <span class="code-keyword" style="color: #000091">for</span> the active file
20:46:11,431 |-INFO in c.q.l.core.rolling.DefaultTimeBasedFileNamingAndTriggeringPolicy - The date pattern is 'yyyyMMdd' from file name pattern 'prosrm.install.home_IS_UNDEFINED/log/1.log.%d{yyyyMMdd}'.
20:46:11,431 |-INFO in c.q.l.core.rolling.DefaultTimeBasedFileNamingAndTriggeringPolicy - Roll-over at midnight.
20:46:11,437 |-INFO in c.q.l.core.rolling.DefaultTimeBasedFileNamingAndTriggeringPolicy - Setting initial period to Fri May 19 20:46:11 ALMT 2017
20:46:11,444 |-INFO in ch.qos.logback.core.rolling.RollingFileAppender[FILE] - Active log file name: prosrm.install.home_IS_UNDEFINED/log/1.log
20:46:11,444 |-INFO in ch.qos.logback.core.rolling.RollingFileAppender[FILE] - File property is set to [prosrm.install.home_IS_UNDEFINED/log/1.log]
20:46:11,447 |-WARN in ch.qos.logback.core.rolling.RollingFileAppender[FILE] - Encoder has not been set. Cannot invoke its init method.
20:46:11,447 |-ERROR in ch.qos.logback.core.rolling.RollingFileAppender[FILE] - No encoder set <span class="code-keyword" style="color: #000091">for</span> the appender named <span class="code-quote" style="color: #009100">"FILE"</span>.
20:46:11,448 |-INFO in ch.qos.logback.classic.joran.action.RootLoggerAction - Setting level of ROOT logger to INFO
20:46:11,448 |-INFO in ch.qos.logback.core.joran.action.AppenderRefAction - Attaching appender named [FILE] to Logger[ROOT]
20:46:11,448 |-INFO in ch.qos.logback.classic.joran.action.ConfigurationAction - End of configuration.
20:46:11,448 |-INFO in ch.qos.logback.classic.joran.JoranConfigurator@6fdb1f78 - Registering current configuration as safe fallback point
</pre>
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