系统日志
详细介绍中间件层面产生的日志信息，包括：格式、用途、相关配置等内容 打开Ubb配置了解Tuxedo日志文件内容 ULOGPFX=\-$TUXDIR/logs/ULOG.*
101951.SHAP0034!GWTDOMAIN.17329.4157245664.0: LIBGWT_CAT:1509: ERROR: occurred during security negotiation - closing connection
打开WebLogic控制台，了解WebLogic server日志配置方法
Server File Name:
Error
./teller/teller.log
The name of the file that stores this server's current log messages. If the pathname is not absolute, the path is assumed to be relative to the root directory of the machine on which this server is running.
Log to Stdout
Specifies whether the server should send messages to standard out (in addition to the log file).
-$DOMAINDIR/dcc.log
Domain File Name:
./dcc.log
The name of the file that stores this WebLogic Server domain log's current log messages. If the pathname is not absolute, the path is assumed to be relative to the root directory of the machine on which the Administration Server is running.
Log to Domain Log File
Specifies whether this server sends messages to the domain log file, in addition to keeping its own log file.
-jdbc.log
Enable JDBC Logging
Specifies whether this server maintains a JDBC log file.
JDBC Log File Name: teller/jdbc.log
The name of the JDBC log file. If the pathname is not absolute, it is assumed to be
relative to the root directory of the machine on which this server is running. (This field is relevant only if you check the Enable JDBC Logging box.)
-access.log
Enable HTTP Logging
Specifies whether this server logs HTTP requests. (The remaining fields on this page are relevant only if you check this box.)
HTTP Log File Name: teller/access.log
The name of the file that stores HTTP requests. If the pathname is not absolute, the path is assumed to be relative to the root directory of the machine on which this server is running.
应用日志
详细介绍控制层日志实现机制，包括实现机制、使用方式、日志文件格式、相关配置等内容 了解log4j日志原理
Log4j的组件：Logger、Appender、Layout
Log4j的等级：ALL Commons-logging + log4j 了解commons-logging的配置 1、commons-logging实现自动选择日志实现系统的步骤： 首先在classpath下寻找自己的配置文件commons-logging.properties ，如果找到，则使 用其中定义的Log实现类； 2、如果找不到commons-logging.properties文件，则在查找是否已定义系统环境变量：org.apache.commons.logging.log，找到则使用其定义的Log实现类。 3、否则，查看classpath中是否有Log4j的包，如果发现，则自动使用Log4j作为日志实现类； 4、否则，使用JDK自身的日志实现类（JDK1.4以后才有日志实现类）； 5、否则，使用commons-logging自己提供的一个简单的日志实现类SimpleLog； 了解控制层log4j.xml配置含义 com.dc.frame.loader. DistLoader applications/frame/WEB-INF/classes/log4j.xml