Java 使用Log4j捕获异常

异常的log4j.category.DataNucleus是什么？所以我尝试将Log4j与googleappengine一起使用，但是在测试过程中，Lo4j并没有发现异常，而是通过仪表板发现异常

我还想把所有的错误都捡起来。所以我把这个添加到了主类中。这会拾取包括fatel在内的所有错误吗

   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，但不是log4j拾取它，因为它没有告诉我log4j捕获了n个异常

异常的log4j.category.DataNucleus是什么

一般的

当然，除了DataNucleus使用它之外，我不使用Eclise或Log4J。我的日志配置文件中有以下内容

log4j.properties

logging.properties

logger.fatal应用程序错误

我从来没有编码过Log4J。此命令是否仅记录致命级别的文本应用程序错误条目

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log4j.logger.DataNucleus

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

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