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Why am I getting this odd log4j Exception?

I have a code base that has been running for several months, today I deployed an update for the client site, and I began to receive the following exception:

Exception in thread "Thread-75" An exception in thread "Thread-66" java.lang.NullPointerException with org.apache.log4j.spi.LocationInfo. (LocationInfo.java:112) in org.apache.log4j.spi.LoggingEvent.getLocationInformation (LoggingEvent.java:247) in org.apache.log4j.helpers.PatternParser $ LocationPatternConverter.convert (PatternParser.java:483) in org. apache.log4j.helpers.PatternConverter.format (PatternConverter.java:65) in org.apache.log4j.PatternLayout.format (PatternLayout.java:502) in org.apache.log4j.WriterAppender.subAppend (WriterAppender.java:302) in org.apache.log4j.RollingFileAppender.subAppend (RollingFileAppender.java:263) in org.apache.log4j.WriterAppender.append (WriterAppender.java:160) in org.apache.log4j.AppenderSkeleton.doAppend (AppenderSke251 ) in org.apache.log4j.helpers.AppenderAttachableImpl.appendLoopOnAppenders (AppenderAttachableImpl.java:66) in org.apache.log4j.Category.callAppenders (Category.java:206) in org.apache.log4j.Category.forcedLog. java: 391) in org.apache.log4j.Category.debug (Category.java:260)

The code that triggered this is the log.debug () operator, I have no idea why this is happening. It also works great on my machine, but doesn’t work on the client site.

Here is the anonymous version of the log configuration:

<?xml version="1.0" encoding="UTF-8" ?> <!DOCTYPE log4j:configuration SYSTEM "log4j.dtd"> <log4j:configuration xmlns:log4j="http://jakarta.apache.org/log4j/"> <appender name="stdout" class="org.apache.log4j.ConsoleAppender"> <param name="Threshold" value="ERROR"/> <layout class="org.apache.log4j.PatternLayout"> <!-- Print the date in ISO 8601 format --> <param name="ConversionPattern" value="[%d{dd-MM-yyyy HH:mm:ss.SS}][line:%3L] [%5p] [%F %M()] - %m%n"/> </layout> </appender> <appender name="x_trace" class="org.apache.log4j.RollingFileAppender"> <param name="File" value="C:/apache-tomcat-5.5.17/logs/x_trace.log"/> <param name="MaxFileSize" value="100MB" /> <param name="MaxBackupIndex" value="10" /> <param name="Append" value="true"/> <param name="Threshold" value="ALL"/> <layout class="org.apache.log4j.PatternLayout"> <param name="ConversionPattern" value="[%d{dd-MM-yyyy HH:mm:ss.SS}][line:%3L]%5p [%t] ( %F %M()) - %m%n"/> </layout> </appender> <appender name="y_trace" class="org.apache.log4j.RollingFileAppender"> <param name="File" value="C:/apache-tomcat-5.5.17/logs/y_trace.log"/> <param name="MaxFileSize" value="100MB" /> <param name="MaxBackupIndex" value="10" /> <param name="Append" value="true"/> <param name="Threshold" value="ALL"/> <layout class="org.apache.log4j.PatternLayout"> <param name="ConversionPattern" value="[%d{dd-MM-yyyy HH:mm:ss.SS}][line:%3L]%5p [%t] ( %F %M()) - %m%n"/> </layout> </appender> <appender name="application" class="org.apache.log4j.RollingFileAppender"> <param name="File" value="C:/apache-tomcat-5.5.17/logs/application.log"/> <param name="MaxFileSize" value="100MB" /> <param name="MaxBackupIndex" value="20" /> <param name="Append" value="true"/> <param name="Threshold" value="ALL"/> <layout class="org.apache.log4j.PatternLayout"> <param name="ConversionPattern" value="[%d{dd-MM-yyyy HH:mm:ss.SS}][line:%3L]%5p [%t] ( %F %M()) - %m%n"/> </layout> </appender> <!-- failureLogger Logs SQL queries that were not written to the database so they can be rolled in --> <appender name="failureLogger" class="org.apache.log4j.DailyRollingFileAppender"> <param name="File" value="C:/apache-tomcat-5.5.17/logs/failures.log"/> <param name="Append" value="true"/> <param name="Threshold" value="ALL"/> <param name="DatePattern" value="'.'yyyy-MM-dd"/> <layout class="org.apache.log4j.PatternLayout"> <param name="ConversionPattern" value="%m%n"/> </layout> </appender> <logger name="nanoxml" additivity="false"> <level value="debug"/> <appender-ref ref="application"/> </logger> <logger name="uk.co.companyName.application" additivity="false"> <level value="debug"/> <appender-ref ref="application"/> </logger> <logger name="uk.co.companyName.application.applicationContainer" additivity="false"> <level value="debug"/> <appender-ref ref="application"/> </logger> <logger name="uk.co.companyName.application.addressbook.AddressBook" additivity="false"> <level value="debug"/> <appender-ref ref="application"/> </logger> <logger name="uk.co.companyName.application.component1.Component1" additivity="false"> <level value="debug"/> <appender-ref ref="application"/> </logger> <logger name="uk.co.companyName.application.component2.Component2" additivity="false"> <level value="debug"/> <appender-ref ref="application"/> </logger> <logger name="uk.co.companyName.application.web.filters" additivity="false"> <level value="error"/> <appender-ref ref="application"/> </logger> <logger name="uk.co.companyName.application.web" additivity="false"> <level value="debug"/> <appender-ref ref="application"/> </logger> <logger name="uk.co.companyName.application.util.SettingsHandler" additivity="false"> <level value="debug"/> <appender-ref ref="application"/> </logger> <logger name="uk.co.companyName.application.util" additivity="false"> <level value="debug"/> <appender-ref ref="application"/> </logger> <logger name="org.apache.axis.enterprise" additivity="false"> <level value="FATAL"/> <appender-ref ref="application"/> </logger> <logger name="com.vendor.api1" additivity="false"> <level value="debug"/> <appender-ref ref="x_trace"/> </logger> <logger name="com.vendor.api2" additivity="false"> <level value="debug"/> <appender-ref ref="y_trace"/> </logger> <logger name="com.vendor.lib1" additivity="false"> <level value="debug"/> <appender-ref ref="y_trace"/> </logger> <logger name="ch.ecma" additivity="false"> <level value="debug"/> <appender-ref ref="y_trace"/> </logger> <logger name="uk.co.companyName.vendor.middlewareAPI" additivity="false"> <level value="debug"/> <appender-ref ref="application"/> </logger> <logger name="uk.co.companyName.vendor2.workStationAPI" additivity="false"> <level value="debug"/> <appender-ref ref="application"/> </logger> <logger name="uk.co.companyName.CustomerLib1" additivity="false"> <level value="debug"/> <appender-ref ref="application"/> </logger> <logger name="FaileStatementLogger" additivity="false"> <level value="debug"/> <appender-ref ref="failureLogger"/> </logger> <root> <priority value="DEBUG" /> <!-- <appender-ref ref="stdout" /> --> </root> </log4j:configuration>
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2 answers

Based on code for 1.2.15 , it seems that private static StringWriter is null , which may indicate a lack of available memory. Not 100% sure what scripts exist that will allow the class to be in this state.

In particular, the code looks like this:

 56 private static StringWriter sw = new StringWriter(); 57 private static PrintWriter pw = new PrintWriter(sw); 112 synchronized(sw) { 113 t.printStackTrace(pw); 114 s = sw.toString(); 115 sw.getBuffer().setLength(0); 116 }

You get an NPE for a synchronized call that is on a static member.

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Can you check your path to the user class of your container, that you have a version of log4j and what is in your library? Try not providing log4j in the lib folder.

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Source: https://habr.com/ru/post/1341653/

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