[HIVE-11572] Datanucleus loads Log4j1.x Logger from AppClassLoader

• Type: Sub-task
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 2.0.0
• Fix Version/s: 2.0.0
• Component/s: Logging
• Assignee: Prasanth Jayachandran
• Reporter: Prasanth Jayachandran
• Created: 15/Aug/15 00:26
• Updated: 16/Feb/16 23:52
• Resolved: 23/Sep/15 00:07

Description

As part of HIVE-11304, we moved from Log4j1.x to Log4j2. But DataNucleus log messages gets logged to console when launching the hive cli. The reason is DataNucleus is trying to load Log4j1.x Logger by traversing its class loader. Although we use log4j-1.2-api bridge we are loading log4j-1.2.16 jar that was pulled by ZooKeeper. We should make sure that there is no log4j-1.2.16 in datanucleus classloader hierarchy (classpath).

DataNucleus logger has this

NucleusLogger.class.getClassLoader().loadClass("org.apache.log4j.Logger");
            loggerClass = org.datanucleus.util.Log4JLogger.class;