[LOG4J2-2690] Custom appenders no longer found with Java 11

• Type: Bug
• Status: Open
• Priority: Major
• Resolution: Unresolved
• Affects Version/s: 2.12.1
• Component/s: Appenders

Environment

Java 11.2

compile group: 'org.slf4j', name: 'slf4j-api', version: '1.8.0-beta4'
compile 'org.apache.logging.log4j:log4j-slf4j18-impl:2.12.1'
compile 'org.apache.logging.log4j:log4j-jcl:2.12.1'
compile 'org.apache.logging.log4j:log4j-api:2.12.1'
compile 'org.apache.logging.log4j:log4j-core:2.12.1'

• Assignee: Unassigned
• Reporter: Tobias Diez
• Created: 10/Sep/19 19:56
• Updated: 16/Apr/20 09:29

Description

After upgrading to Java 11, the custom appenders are no longer found. The following errors are shown when running the app:

2019-09-10 21:44:54,195 main ERROR Error processing element GuiAppender ([Appenders: null]): CLASS_NOT_FOUND
2019-09-10 21:44:54,240 main ERROR Appenders contains an invalid element or attribute "OurApplicationInsightsAppender"
2019-09-10 21:44:54,261 main ERROR Unable to locate appender "applicationInsightsAppender" for logger config "root"
2019-09-10 21:44:54,262 main ERROR Unable to locate appender "GuiLogger" for logger config "org.jabref"
2019-09-10 21:44:54,262 main ERROR Unable to locate appender "GuiLogger" for logger config "org.apache.pdfbox"

The log4j config file can be found here:
https://github.com/JabRef/jabref/blob/master/src/main/resources/log4j2.xml
and the appender here:
https://github.com/JabRef/jabref/blob/master/src/main/java/org/jabref/gui/logging/GuiAppender.java

(They were working with Java 8, so it shouldn't be a configuration problem.)