Null Pointer Exception with slf4j-log4j12-1.7.30 (Fluent-logger incompatible with the new version)

Tái hiện lỗi với slf4j-log4j12 1.7.30 và so sánh với 1.7.18 bằng kịch bản spark-submit. Trước tiên, đọc phần khởi tạo FluentLogger.getLogger, FluentLoggerFactory.getLogger và RawSocketSender. Được coi là hoàn tất khi FluentLogger.getLogger không còn ném NullPointerException với phiên bản SLF4J mới hơn và đường dẫn logging hiện có vẫn sử dụng được.

When running spark-submit with slf4j-log4j12-1.7.18.jar in the ClassPath, FluentLogger works with no issues.
When we use version 1.7.30 which comes with Spark3.0, Fluentlogger.getLogger throws a null pointer exception.

This is the offending commit introduced in 1.7.19  which was done to fix a NullPointerException. Its force initializing rootLogger to fix a NPE in multithreaded scenarios looks like. The irony is this is the commit which is causing NullPointerException for us
https://github.com/qos-ch/slf4j/commit/111b8e581e247b33bb2fe66bd0118399e0b49a90

Can we upgrade the version of slf4j-api in FluentLogger to latest 1.7.30 and make it compatible?

hdiuser@hn0-d0140a:/usr/hdp/4.1-0/spark2/jars$ spark-submit --version
SPARK_MAJOR_VERSION is set to 2, using Spark2
Unexpected problem occured during version sanity check
Reported exception:
java.lang.NullPointerException
at org.slf4j.LoggerFactory.versionSanityCheck(LoggerFactory.java:267)
at org.slf4j.LoggerFactory.performInitialization(LoggerFactory.java:126)
at org.slf4j.LoggerFactory.getILoggerFactory(LoggerFactory.java:412)
at org.slf4j.LoggerFactory.getLogger(LoggerFactory.java:357)
at org.slf4j.LoggerFactory.getLogger(LoggerFactory.java:383)
at org.fluentd.logger.sender.RawSocketSender.(RawSocketSender.java:34)
at org.fluentd.logger.FluentLoggerFactory.getLogger(FluentLoggerFactory.java:72)
at org.fluentd.logger.FluentLoggerFactory.getLogger(FluentLoggerFactory.java:51)
at org.fluentd.logger.FluentLogger.getLogger(FluentLogger.java:40)
at com.mdsdclient.MdsLogger.(Unknown Source)
at com.log4jappender.common.logger.HdInsightLoggerLinux.(Unknown Source)
at com.log4jappender.common.logger.HdInsightLoggerFactory.getLogger(Unknown Source)
at com.log4jappender.common.appendercore.AnonymizeLogAppenderCommon.getLogger(Unknown Source)
at com.log4jappender.common.appendercore.AnonymizeLogAppenderCommon.(Unknown Source)
at com.microsoft.log4jappender.AnonymizeLogAppender.activateOptions(Unknown Source)
at org.apache.log4j.config.PropertySetter.activate(PropertySetter.java:307)
at org.apache.log4j.config.PropertySetter.setProperties(PropertySetter.java:172)
at org.apache.log4j.config.PropertySetter.setProperties(PropertySetter.java:104)
at org.apache.log4j.PropertyConfigurator.parseAppender(PropertyConfigurator.java:842)
at org.apache.log4j.PropertyConfigurator.parseCategory(PropertyConfigurator.java:768)
at org.apache.log4j.PropertyConfigurator.configureRootCategory(PropertyConfigurator.java:648)
at org.apache.log4j.PropertyConfigurator.doConfigure(PropertyConfigurator.java:514)
at org.apache.log4j.PropertyConfigurator.doConfigure(PropertyConfigurator.java:580)
at org.apache.log4j.helpers.OptionConverter.selectAndConfigure(OptionConverter.java:526)
at org.apache.log4j.LogManager.(LogManager.java:127)
at org.slf4j.impl.Log4jLoggerFactory.(Log4jLoggerFactory.java:66)
at org.slf4j.impl.StaticLoggerBinder.(StaticLoggerBinder.java:72)
at org.slf4j.impl.StaticLoggerBinder.(StaticLoggerBinder.java:45)
at org.apache.spark.internal.Logging$.org$apache$spark$internal$Logging$$isLog4j12(Logging.scala:222)
at org.apache.spark.internal.Logging.initializeLogging(Logging.scala:127)
at org.apache.spark.internal.Logging.initializeLogIfNecessary(Logging.scala:111)
at org.apache.spark.internal.Logging.initializeLogIfNecessary$(Logging.scala:105)
at org.apache.spark.deploy.SparkSubmit.initializeLogIfNecessary(SparkSubmit.scala:75)
at org.apache.spark.deploy.SparkSubmit.doSubmit(SparkSubmit.scala:83)
at org.apache.spark.deploy.SparkSubmit$$anon$2.doSubmit(SparkSubmit.scala:1007)
at org.apache.spark.deploy.SparkSubmit$.main(SparkSubmit.scala:1016)
at org.apache.spark.deploy.SparkSubmit.main(SparkSubmit.scala)
Exception in thread "main" java.lang.ExceptionInInitializerError
at org.fluentd.logger.FluentLoggerFactory.getLogger(FluentLoggerFactory.java:72)
at org.fluentd.logger.FluentLoggerFactory.getLogger(FluentLoggerFactory.java:51)
at org.fluentd.logger.FluentLogger.getLogger(FluentLogger.java:40)
at com.mdsdclient.MdsLogger.(Unknown Source)
at com.log4jappender.common.logger.HdInsightLoggerLinux.(Unknown Source)
at com.log4jappender.common.logger.HdInsightLoggerFactory.getLogger(Unknown Source)
at com.log4jappender.common.appendercore.AnonymizeLogAppenderCommon.getLogger(Unknown Source)
at com.log4jappender.common.appendercore.AnonymizeLogAppenderCommon.(Unknown Source)
at com.log4jappender.AnonymizeLogAppender.activateOptions(Unknown Source)
at org.apache.log4j.config.PropertySetter.activate(PropertySetter.java:307)
at org.apache.log4j.config.PropertySetter.setProperties(PropertySetter.java:172)
at org.apache.log4j.config.PropertySetter.setProperties(PropertySetter.java:104)
at org.apache.log4j.PropertyConfigurator.parseAppender(PropertyConfigurator.java:842)
at org.apache.log4j.PropertyConfigurator.parseCategory(PropertyConfigurator.java:768)
at org.apache.log4j.PropertyConfigurator.configureRootCategory(PropertyConfigurator.java:648)
at org.apache.log4j.PropertyConfigurator.doConfigure(PropertyConfigurator.java:514)
at org.apache.log4j.PropertyConfigurator.doConfigure(PropertyConfigurator.java:580)
at org.apache.log4j.helpers.OptionConverter.selectAndConfigure(OptionConverter.java:526)
at org.apache.log4j.LogManager.(LogManager.java:127)
at org.slf4j.impl.Log4jLoggerFactory.(Log4jLoggerFactory.java:66)
at org.slf4j.impl.StaticLoggerBinder.(StaticLoggerBinder.java:72)
at org.slf4j.impl.StaticLoggerBinder.(StaticLoggerBinder.java:45)
at org.apache.spark.internal.Logging$.org$apache$spark$internal$Logging$$isLog4j12(Logging.scala:222)
at org.apache.spark.internal.Logging.initializeLogging(Logging.scala:127)
at org.apache.spark.internal.Logging.initializeLogIfNecessary(Logging.scala:111)
at org.apache.spark.internal.Logging.initializeLogIfNecessary$(Logging.scala:105)
at org.apache.spark.deploy.SparkSubmit.initializeLogIfNecessary(SparkSubmit.scala:75)
at org.apache.spark.deploy.SparkSubmit.doSubmit(SparkSubmit.scala:83)
at org.apache.spark.deploy.SparkSubmit$$anon$2.doSubmit(SparkSubmit.scala:1007)
at org.apache.spark.deploy.SparkSubmit$.main(SparkSubmit.scala:1016)
at org.apache.spark.deploy.SparkSubmit.main(SparkSubmit.scala)
Caused by: java.lang.NullPointerException
at org.slf4j.LoggerFactory.getILoggerFactory(LoggerFactory.java:418)
at org.slf4j.LoggerFactory.getLogger(LoggerFactory.java:357)
at org.slf4j.LoggerFactory.getLogger(LoggerFactory.java:383)
at org.fluentd.logger.sender.RawSocketSender.(RawSocketSender.java:34)
... 31 more