[LOG4J2-2612] NullPointerException at org.apache.logging.log4j.core.appender.db.jdbc.JdbcDatabaseManager.writeInternal(JdbcDatabaseManager.java:803)

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 2.11.2
• Fix Version/s: 3.0.0, 2.12.0
• Component/s: Core
• Assignee: Gary D. Gregory
• Reporter: Gary D. Gregory
• Created: 21/May/19 23:32
• Updated: 30/May/19 11:35
• Resolved: 30/May/19 01:08

Description

A NullPointerException can be thrown at org.apache.logging.log4j.core.appender.db.jdbc.JdbcDatabaseManager.writeInternal(JdbcDatabaseManager.java:803)

This seems to happen if writeInternal() runs at the same time as either a reconnect or the appender shutting down.

2019-05-21 19:16:36,913 qtp546045276-4680 ERROR An exception occurred processing Appender JDBC-Response org.apache.logging.log4j.core.appender.AppenderLoggingException: Unable to write to database in appender: null
        at org.apache.logging.log4j.core.appender.db.AbstractDatabaseAppender.append(AbstractDatabaseAppender.java:118)
        at org.apache.logging.log4j.core.config.AppenderControl.tryCallAppender(AppenderControl.java:156)
        at org.apache.logging.log4j.core.config.AppenderControl.callAppender0(AppenderControl.java:129)
        at org.apache.logging.log4j.core.config.AppenderControl.callAppenderPreventRecursion(AppenderControl.java:120)
        at org.apache.logging.log4j.core.config.AppenderControl.callAppender(AppenderControl.java:84)
        at org.apache.logging.log4j.core.config.LoggerConfig.callAppenders(LoggerConfig.java:464)
        at org.apache.logging.log4j.core.config.LoggerConfig.processLogEvent(LoggerConfig.java:448)
        at org.apache.logging.log4j.core.config.LoggerConfig.log(LoggerConfig.java:431)
        at org.apache.logging.log4j.core.config.LoggerConfig.log(LoggerConfig.java:406)
        at org.apache.logging.log4j.core.config.AwaitCompletionReliabilityStrategy.log(AwaitCompletionReliabilityStrategy.java:63)
        at org.apache.logging.log4j.core.Logger.logMessage(Logger.java:146)
        at org.apache.logging.log4j.spi.AbstractLogger.tryLogMessage(AbstractLogger.java:2170)
        at org.apache.logging.log4j.spi.AbstractLogger.logMessageTrackRecursion(AbstractLogger.java:2125)
        at org.apache.logging.log4j.spi.AbstractLogger.logMessageSafely(AbstractLogger.java:2108)
        at org.apache.logging.log4j.spi.AbstractLogger.logIfEnabled(AbstractLogger.java:1827)
        at org.apache.logging.log4j.spi.AbstractLogger.info(AbstractLogger.java:1281)
        <SNIP/>
Caused by: java.lang.NullPointerException
        at org.apache.logging.log4j.core.appender.db.jdbc.JdbcDatabaseManager.writeInternal(JdbcDatabaseManager.java:803)
        at org.apache.logging.log4j.core.appender.db.jdbc.JdbcDatabaseManager.writeThrough(JdbcDatabaseManager.java:823)
        at org.apache.logging.log4j.core.appender.db.AbstractDatabaseManager.write(AbstractDatabaseManager.java:264)
        at org.apache.logging.log4j.core.appender.db.AbstractDatabaseAppender.append(AbstractDatabaseAppender.java:110)
        ... 45 more