我已经定义log4j2.properties为
...
appender.async.type = Async
appender.async.name = async
appender.async.appenderRefs.type = AppenderRefs
appender.async.appenderRefs.consoleAppender.type = AppenderRef
appender.async.appenderRefs.consoleAppender.ref = console
rootLogger.level = debug
rootLogger.appenderRef.console.ref = async
rootLogger.appenderRef.rolling.ref = rolling
运行时异常：
2019-06-28 12:03:27,996 main ERROR Could not create plugin of type class org.apache.logging.log4j.core.appender.AsyncAppender for element Async: java.lang.NullPointerException java.lang.NullPointerException
at org.apache.logging.log4j.core.config.plugins.visitors.PluginElementVisitor.visit(PluginElementVisitor.java:52)
at org.apache.logging.log4j.core.config.plugins.util.PluginBuilder.injectFields(PluginBuilder.java:180)
at org.apache.logging.log4j.core.config.plugins.util.PluginBuilder.build(PluginBuilder.java:121)
at org.apache.logging.log4j.core.config.AbstractConfiguration.createPluginObject(AbstractConfiguration.java:964)
...
2019-06-28 12:03:27,997 main ERROR Unable to invoke factory method in class org.apache.logging.log4j.core.appender.AsyncAppender for element Async: java.lang.IllegalStateException: No factory method found for class org.apache.logging.log4j.core.appender.AsyncAppender java.lang.IllegalStateException: No …