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org.apache.logging.log4j.core.config.ConfigurationException: No appenders are available for AsyncAppender Async	at org.apache.logging.log4j.core.appender.AsyncAppender.start(AsyncAppender.java:105)	at org.apache.logging.log4j.core.config.AbstractConfiguration.start(AbstractConfiguration.java:157)	at org.apache.logging.log4j.core.LoggerContext.setConfiguration(LoggerContext.java:364)	at org.apache.logging.log4j.core.LoggerContext.reconfigure(LoggerContext.java:422)	at org.apache.logging.log4j.core.LoggerContext.start(LoggerContext.java:146)	at org.apache.logging.log4j.core.impl.Log4jContextFactory.getContext(Log4jContextFactory.java:85)	at org.apache.logging.log4j.core.impl.Log4jContextFactory.getContext(Log4jContextFactory.java:37)	at org.apache.logging.log4j.LogManager.getContext(LogManager.java:269)	at org.apache.logging.slf4j.Log4jLoggerFactory$PrivateManager.getContext(Log4jLoggerFactory.java:98)	at org.apache.logging.slf4j.Log4jLoggerFactory.getContext(Log4jLoggerFactory.java:84)	at org.apache.logging.slf4j.Log4jLoggerFactory.getLogger(Log4jLoggerFactory.java:44)	at org.slf4j.LoggerFactory.getLogger(LoggerFactory.java:270)	at org.slf4j.LoggerFactory.getLogger(LoggerFactory.java:281)	at ace.demo.websocket.DemoWebsocketConfig.(DemoWebsocketConfig.java:20)	at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)	at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:57)	at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)	at java.lang.reflect.Constructor.newInstance(Constructor.java:526)	at java.lang.Class.newInstance(Class.java:374)	at org.apache.tomcat.websocket.server.WsSci.onStartup(WsSci.java:95)	at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5456)	at com.aliyun.ace4j.container.tomcat7.AceContext.startInternal(AceContext.java:45)	at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150)	at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1559)	at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1549)	at java.util.concurrent.FutureTask.run(FutureTask.java:262)	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)	at java.lang.Thread.run(Thread.java:744)