Question

例外的log4j.category.DataNucleus是什么？所以我想尝试将Log4j与Google App Engine一起使用，但是在测试期间，Lo4j没有接收到异常（它们被仪表板拾取）。

此外，我希望获取所有错误。所以我把它添加到主类。这会不会包括所有错误，包括fatel？

   logger.fatal ("App Error");

好的，我试过这个：

 }
     catch(Exception e) {
            logger.warn("Log4j has caught n exception!", e);
            e.printStackTrace();
        }

然而，异常显示在仪表板中，但它不是log4j，因为它没有给我“Log4j已经捕获n异常！”。

Answer 1

例外的log4j.category.DataNucleus是什么？

log4j.logger.DataNucleus

常规

我不使用Eclise或Log4J（当然，除了DataNucleus使用它）。我的日志配置文件中包含以下内容。

<强> log4j.properties

log4j.appender.A1 = org.apache.log4j.ConsoleAppender log4j.appender.A1.layout = org.apache.log4j.PatternLayout log4j.appender.A1.layout.ConversionPattern = %d{HH:mm:ss,SSS} (%t) %-5p [%c] - %m%n [...] # Tighten logging on the DataNucleus categories to WARN. # This DataNucleus logging configuration appears redundant; in production, # DataNucleus uses Java logging instead. log4j.logger.DataNucleus = WARN, A1 log4j.logger.DataNucleus.JDO = WARN, A1 log4j.logger.DataNucleus.Persistence = WARN, A1 log4j.logger.DataNucleus.Query = WARN, A1 log4j.logger.DataNucleus.Lifecycle = WARN, A1 log4j.logger.DataNucleus.Cache = WARN, A1 log4j.logger.DataNucleus.MetaData = WARN, A1 log4j.logger.DataNucleus.Management = WARN, A1 log4j.logger.DataNucleus.General = WARN, A1 log4j.logger.DataNucleus.Connection = WARN, A1 log4j.logger.DataNucleus.Transaction = WARN, A1 log4j.logger.DataNucleus.Datastore = WARN, A1 log4j.logger.DataNucleus.ClassLoading = WARN, A1 log4j.logger.DataNucleus.Plugin = WARN, A1 log4j.logger.DataNucleus.ValueGeneration = WARN, A1 log4j.logger.DataNucleus.Enhancer = WARN, A1 log4j.logger.DataNucleus.SchemaTool = WARN, A1

<强> logging.properties

handlers = java.util.logging.ConsoleHandler java.util.logging.ConsoleHandler.level = ALL java.util.logging.ConsoleHandler.formatter = java.util.logging.SimpleFormatter [...] # Set the default logging level for ORM, specifically, to WARNING DataNucleus.level = WARNING DataNucleus.JDO.level = WARNING DataNucleus.Persistence.level = WARNING DataNucleus.Query.level = WARNING DataNucleus.Lifecycle.level = WARNING DataNucleus.Cache.level = WARNING DataNucleus.MetaData.level = WARNING DataNucleus.Management.level = WARNING DataNucleus.General.level = WARNING DataNucleus.Connection.level = WARNING DataNucleus.Transaction.level = WARNING DataNucleus.Datastore.level = WARNING DataNucleus.ClassLoading.level = WARNING DataNucleus.Plugin.level = WARNING DataNucleus.ValueGeneration.level = WARNING DataNucleus.Enhancer.level = WARNING DataNucleus.SchemaTool.level = WARNING

logger.fatal（“App Error”）;

我从未编写过Log4J。这个命令不只是在致命级别记录文本"App Error"的条目吗？

享受？

使用Log4j捕获异常

1 个答案: