srangara123 opened a new issue, #1805: URL: https://github.com/apache/logging-log4j2/issues/1805
## Description We have an application that defines custom Log Levels. When we use the `JsonTemplateLayout` (https://logging.apache.org/log4j/2.x/manual/json-template-layout.html) we sometimes get a Null pointer Exception This is due to the LevelResolver caching the Levels before we create our custom Log Levels Please refer to the main method below. ## Configuration **Version:** 2.20.0 **Operating system:** Windows **JDK:** JDK 1.8 ## Logs ``` {"@timestamp":"2023-09-19T18:46:34.239Z","ecs.version":"1.2.0","log.level":"INFO","message":"{foo=bar, foo_1=bar_1}","process.thread.name":"main","log.logger":"com.simple.log4j.LoggerTest"} ERROR StatusConsoleListener An exception occurred processing Appender Console java.lang.NullPointerException: seq at java.util.Objects.requireNonNull(Objects.java:228) at org.apache.logging.log4j.layout.template.json.util.JsonWriter.writeRawString(JsonWriter.java:800) at org.apache.logging.log4j.layout.template.json.resolver.LevelResolver.lambda$createNameResolver$3(LevelResolver.java:144) at org.apache.logging.log4j.layout.template.json.resolver.LevelResolver.resolve(LevelResolver.java:172) at org.apache.logging.log4j.layout.template.json.resolver.LevelResolver.resolve(LevelResolver.java:75) at org.apache.logging.log4j.layout.template.json.resolver.TemplateResolver.resolve(TemplateResolver.java:66) at org.apache.logging.log4j.layout.template.json.resolver.TemplateResolvers$PrefixedFieldResolverMethod.resolve(TemplateResolvers.java:353) at org.apache.logging.log4j.layout.template.json.resolver.TemplateResolvers$MapResolver.resolve(TemplateResolvers.java:409) at org.apache.logging.log4j.layout.template.json.JsonTemplateLayout.encode(JsonTemplateLayout.java:304) at org.apache.logging.log4j.layout.template.json.JsonTemplateLayout.encode(JsonTemplateLayout.java:60) at org.apache.logging.log4j.core.appender.AbstractOutputStreamAppender.directEncodeEvent(AbstractOutputStreamAppender.java:215) at org.apache.logging.log4j.core.appender.AbstractOutputStreamAppender.tryAppend(AbstractOutputStreamAppender.java:208) at org.apache.logging.log4j.core.appender.AbstractOutputStreamAppender.append(AbstractOutputStreamAppender.java:199) at org.apache.logging.log4j.core.config.AppenderControl.tryCallAppender(AppenderControl.java:161) at org.apache.logging.log4j.core.config.AppenderControl.callAppender0(AppenderControl.java:134) at org.apache.logging.log4j.core.config.AppenderControl.callAppenderPreventRecursion(AppenderControl.java:125) at org.apache.logging.log4j.core.config.AppenderControl.callAppender(AppenderControl.java:89) at org.apache.logging.log4j.core.config.LoggerConfig.callAppenders(LoggerConfig.java:683) at org.apache.logging.log4j.core.config.LoggerConfig.processLogEvent(LoggerConfig.java:641) at org.apache.logging.log4j.core.config.LoggerConfig.log(LoggerConfig.java:624) at org.apache.logging.log4j.core.config.LoggerConfig.log(LoggerConfig.java:560) at org.apache.logging.log4j.core.config.AwaitCompletionReliabilityStrategy.log(AwaitCompletionReliabilityStrategy.java:82) at org.apache.logging.log4j.core.Logger.log(Logger.java:163) at org.apache.logging.log4j.spi.AbstractLogger.tryLogMessage(AbstractLogger.java:2168) at org.apache.logging.log4j.spi.AbstractLogger.logMessageTrackRecursion(AbstractLogger.java:2122) at org.apache.logging.log4j.spi.AbstractLogger.logMessageSafely(AbstractLogger.java:2105) at org.apache.logging.log4j.spi.AbstractLogger.logIfEnabled(AbstractLogger.java:1799) at org.apache.logging.log4j.spi.AbstractLogger.log(AbstractLogger.java:1585) at com.simple.log4j.LoggerTest.main(LoggerTest.java:20) ``` ## Reproduction ```xml <?xml version="1.0" encoding="UTF-8"?> <Configuration> <Appenders> <Console name="Console" target="SYSTEM_OUT"> <JsonTemplateLayout eventTemplateUri="classpath:EcsLayout.json" /> </Console> </Appenders> <Loggers> <Root level="ALL"> <AppenderRef ref="Console" /> </Root> </Loggers> </Configuration> ``` Log4j2.xml file ```java public static void main(String[] args) { Logger logger = [LogManager.getLogger("json-logger"); Map<String, String> logMap = new HashMap<>(); logMap.put("foo", "bar"); logMap.put("foo_1", "bar_1"); logger.info(new ObjectMessage(logMap)); logger.log(org.apache.logging.log4j.Level.forName("MY_CUSTOM_LEVEL", 250), new ObjectMessage(logMap)); } ``` This last line produces a NPE -- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. To unsubscribe, e-mail: [email protected] For queries about this service, please contact Infrastructure at: [email protected]
