连接数据库出错的日志为什么没有输出到日志文件中？

Question

log4j.properties
log4j.appender.A1=org.apache.log4j.ConsoleAppender
log4j.appender.A1.layout=org.apache.log4j.PatternLayout 
log4j.appender.A1.layout.ConversionPattern=%r [%t] %-5p %C.%M() - %m%n
log4j.rootLogger=debug, A1,R# Set root logger level to DEBUG and its only appender to A1.log4j.appender.R=org.apache.log4j.DailyRollingFileAppender
log4j.appender.R=org.apache.log4j.ConsoleAppender
log4j.appender.R.File=D:/t.log
log4j.appender.R.Append=true
log4j.appender.R.MaxFileSize=500KB
log4j.appender.R.DatePattern ='.'yyyy-MM-dd'.txt'
log4j.appender.R.layout=org.apache.log4j.PatternLayout
log4j.appender.R.layout.ConversionPattern=%-d{yyyy-MM-dd HH:mm:ss} [%c]-[%p] %m%n
log4j.category.org.apache.cactus = WARN
log4j.category.servletunit = WARN
log4j.category.org.apache.commons.beanutils = ERROR
连接数据库出错的日志 在控制台可以显示出来，但是日志文件不能显示出来，

Answer 1

COM.ibm.db2.jdbc.DB2Exception: [IBM][CLI Driver] SQL30081N  A communication error has been detected.  Communication protocol being used: "TCP/IP".  Communication API being used: "SOCKETS".  Location where the error was detected: "".  Communication function detecting the error: "connect".  Protocol specific error code(s): "10060", "*", "*".  SQLSTATE=08001 at COM.ibm.db2.jdbc.app.SQLExceptionGenerator.throw_SQLException(SQLExceptionGenerator.java:184)
at COM.ibm.db2.jdbc.app.SQLExceptionGenerator.check_return_code(SQLExceptionGenerator.java:441)
at COM.ibm.db2.jdbc.app.DB2Connection.connect(DB2Connection.java:493)
at COM.ibm.db2.jdbc.app.DB2Connection.<init>(DB2Connection.java:382)
at COM.ibm.db2.jdbc.app.DB2Driver.connect(DB2Driver.java:358)
at java.sql.DriverManager.getConnection(DriverManager.java:525)
at java.sql.DriverManager.getConnection(DriverManager.java:171)
at com.pawnpro.dbutil.JdbcUtilClass.getConnection(JdbcUtilClass.java:14)
at com.pawnpro.dbutil.JdbcUtil.getConnection(JdbcUtil.java:54)
at com.pawnpro.servlet.TransAction.transferDate(TransAction.java:99)
at com.pawnpro.servlet.TransAction.execute(TransAction.java:46)
at org.apache.struts.action.RequestProcessor.processActionPerform(RequestProcessor.java:419)
at org.apache.struts.action.RequestProcessor.process(RequestProcessor.java:224)
at org.apache.struts.action.ActionServlet.process(ActionServlet.java:1192)
at org.apache.struts.action.ActionServlet.doGet(ActionServlet.java:412)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:689)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:237)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:157)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:214)
at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:104)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:520)
at org.apache.catalina.core.StandardContextValve.invokeInternal(StandardContextValve.java:198)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:152)
at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:104)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:520)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:137)
at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:104)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:118)
at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:102)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:520)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:104)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:520)
at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:929)
at org.apache.coyote.tomcat5.CoyoteAdapter.service(CoyoteAdapter.java:160)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:799)
at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.processConnection(Http11Protocol.java:705)
at org.apache.tomcat.util.net.TcpWorkerThread.runIt(PoolTcpEndpoint.java:577)
at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:683)
at java.lang.Thread.run(Thread.java:595)
上面 出错信息不能输出到日志文件t.log  ,下面的可以输出到t.log中
1583647 [http-8080-Processor24] INFO  com.pawnpro.servlet.TransAction.transferDate() -  DCAD db2  error
2007-03-26 15:52:04 [com.pawnpro.servlet.TransAction]-[INFO]  DCAD db2  error

Answer 2

log4j.properties  怎么把这些错误日志输出到       t.log文件中

Answer 3

log4j.appender.R=org.apache.log4j.ConsoleAppender去掉