jsp文件中，控制台出来的信息不知是何意
未使用框架，无servlet，就是简单的jsp+javaBean连 mysql，程序也能运行，未报错误。
但是：控制台出现一些信息，不知是何意？为何与先前的不一样啊？？何人可解释一番。
Mar 05, 2013 10:04:55 AM org.apache.catalina.core.AprLifecycleListener init
INFO: Loaded APR based Apache Tomcat Native library 1.1.24 using APR version 1.4.6.
Mar 05, 2013 10:04:55 AM org.apache.catalina.core.AprLifecycleListener init
INFO: APR capabilities: IPv6 [true], sendfile [true], accept filters [false], random [true].
Mar 05, 2013 10:04:56 AM org.apache.catalina.core.AprLifecycleListener initializeSSL
INFO: OpenSSL successfully initialized (OpenSSL 1.0.1c 10 May 2012)
Mar 05, 2013 10:04:57 AM org.apache.coyote.AbstractProtocol init
INFO: Initializing ProtocolHandler ["http-apr-8080"]
Mar 05, 2013 10:04:57 AM org.apache.coyote.AbstractProtocol init
INFO: Initializing ProtocolHandler ["ajp-apr-8009"]
Mar 05, 2013 10:04:57 AM org.apache.catalina.startup.Catalina load
INFO: Initialization processed in 2261 ms
Mar 05, 2013 10:04:57 AM org.apache.catalina.core.StandardService startInternal
INFO: Starting service Catalina
Mar 05, 2013 10:04:57 AM org.apache.catalina.core.StandardEngine startInternal
INFO: Starting Servlet Engine: Apache Tomcat/7.0.28
Mar 05, 2013 10:04:57 AM org.apache.catalina.startup.HostConfig deployWAR
INFO: Deploying web application archive D:\xampp\tomcat\webapps\2weima.war
Mar 05, 2013 10:04:57 AM org.apache.catalina.startup.HostConfig deployDirectory
INFO: Deploying web application directory D:\xampp\tomcat\webapps\.metadata
Mar 05, 2013 10:04:58 AM org.apache.catalina.startup.HostConfig deployDirectory
INFO: Deploying web application directory D:\xampp\tomcat\webapps\docs
Mar 05, 2013 10:04:58 AM org.apache.catalina.startup.HostConfig deployDirectory
INFO: Deploying web application directory D:\xampp\tomcat\webapps\examples
Mar 05, 2013 10:04:58 AM org.apache.catalina.core.ApplicationContext log
INFO: ContextListener: contextInitialized()
Mar 05, 2013 10:04:58 AM org.apache.catalina.core.ApplicationContext log
INFO: SessionListener: contextInitialized()
Mar 05, 2013 10:04:58 AM org.apache.catalina.core.ApplicationContext log
INFO: ContextListener: attributeAdded('org.apache.jasper.compiler.TldLocationsCache', 'org.apache.jasper.compiler.TldLocationsCache@13017a9')
Mar 05, 2013 10:04:58 AM org.apache.catalina.startup.HostConfig deployDirectory
INFO: Deploying web application directory D:\xampp\tomcat\webapps\fck
Mar 05, 2013 10:04:58 AM org.apache.catalina.startup.TaglibUriRule body
INFO: TLD skipped. URI: http://fckeditor.net/tags-fckeditor is already defined
---- SimpleUploaderServlet initialization started ----
php|php3|php5|phtml|asp|aspx|ascx|jsp|cfm|cfc|pl|bat|exe|dll|reg|cgi
0 - php
1 - php3
2 - php5
3 - phtml
4 - asp
5 - aspx
6 - ascx
7 - jsp
8 - cfm
9 - cfc
10 - pl
11 - bat
12 - exe
13 - dll
14 - reg
15 - cgi
jpg|gif|jpeg|png|bmp
0 - jpg
1 - gif
2 - jpeg
3 - png
4 - bmp
swf|fla
0 - swf
1 - fla
---- SimpleUploaderServlet initialization completed ----
Mar 05, 2013 10:04:59 AM org.apache.catalina.startup.HostConfig deployDirectory
INFO: Deploying web application directory D:\xampp\tomcat\webapps\fckeditor
Mar 05, 2013 10:04:59 AM org.apache.catalina.startup.HostConfig deployDirectory
INFO: Deploying web application directory D:\xampp\tomcat\webapps\gwc
Couldn't create bookstore database bean: Couldn't open connection to database: Access denied for user 'root'@'localhost' (using password: YES)
Mar 05, 2013 10:05:00 AM org.apache.catalina.startup.HostConfig deployDirectory
INFO: Deploying web application directory D:\xampp\tomcat\webapps\host-manager
Mar 05, 2013 10:05:00 AM org.apache.catalina.startup.HostConfig deployDirectory
INFO: Deploying web application directory D:\xampp\tomcat\webapps\manager
Mar 05, 2013 10:05:00 AM org.apache.catalina.startup.HostConfig deployDirectory
INFO: Deploying web application directory D:\xampp\tomcat\webapps\ROOT
Mar 05, 2013 10:05:00 AM org.apache.catalina.startup.HostConfig deployDirectory
INFO: Deploying web application directory D:\xampp\tomcat\webapps\scanner
Mar 05, 2013 10:05:04 AM com.sun.faces.config.ConfigureListener contextInitialized
INFO: Initializing Mojarra 2.0.3 (FCS b03) for context '/scanner'
Mar 05, 2013 10:05:05 AM com.sun.faces.spi.InjectionProviderFactory createInstance
INFO: JSF1048: PostConstruct/PreDestroy annotations present. ManagedBeans methods marked with these annotations will have said annotations processed.
Mar 05, 2013 10:05:06 AM org.apache.catalina.startup.HostConfig deployDirectory
INFO: Deploying web application directory D:\xampp\tomcat\webapps\servletPro
Mar 05, 2013 10:05:09 AM com.sun.faces.config.ConfigureListener contextInitialized
INFO: Initializing Mojarra 2.0.3 (FCS b03) for context '/servletPro'
Mar 05, 2013 10:05:09 AM com.sun.faces.spi.InjectionProviderFactory createInstance
INFO: JSF1048: PostConstruct/PreDestroy annotations present. ManagedBeans methods marked with these annotations will have said annotations processed.
Mar 05, 2013 10:05:10 AM org.apache.catalina.startup.HostConfig deployDirectory
INFO: Deploying web application directory D:\xampp\tomcat\webapps\trial
Mar 05, 2013 10:05:11 AM org.apache.catalina.startup.HostConfig deployDirectory
INFO: Deploying web application directory D:\xampp\tomcat\webapps\UserManager
Mar 05, 2013 10:05:11 AM org.apache.catalina.loader.WebappClassLoader validateJarFile
INFO: validateJarFile(D:\xampp\tomcat\webapps\UserManager\WEB-INF\lib\servlet-api.jar) - jar not loaded. See Servlet Spec 2.3, section 9.7.2. Offending class: javax/servlet/Servlet.class
Mar 05, 2013 10:05:11 AM org.apache.coyote.AbstractProtocol start
INFO: Starting ProtocolHandler ["http-apr-8080"]
Mar 05, 2013 10:05:11 AM org.apache.coyote.AbstractProtocol start
INFO: Starting ProtocolHandler ["ajp-apr-8009"]
Mar 05, 2013 10:05:11 AM org.apache.catalina.startup.Catalina start
INFO: Server startup in 14001 ms
Mar 05, 2013 11:13:09 AM org.apache.catalina.core.StandardWrapperValve invoke
SEVERE: Servlet.service() for servlet [jsp] in context with path [/scanner] threw exception [Unable to compile class for JSP:
An error occurred at line: 3 in the jsp file: /receive.jsp
currentUser cannot be resolved
1: <jsp:include page="head.jsp"/>
2: <%
3: if(currentUser.getDb()==null){
4: response.sendRedirect("index.jsp");
5: }
6: %>
Stacktrace:] with root cause
org.apache.jasper.JasperException: Unable to compile class for JSP:
An error occurred at line: 3 in the jsp file: /receive.jsp
currentUser cannot be resolved
1: <jsp:include page="head.jsp"/>
2: <%
3: if(currentUser.getDb()==null){
4: response.sendRedirect("index.jsp");
5: }
6: %>
Stacktrace:
at org.apache.jasper.compiler.DefaultErrorHandler.javacError(DefaultErrorHandler.java:102)
at org.apache.jasper.compiler.ErrorDispatcher.javacError(ErrorDispatcher.java:331)
at org.apache.jasper.compiler.JDTCompiler.generateClass(JDTCompiler.java:469)
at org.apache.jasper.compiler.Compiler.compile(Compiler.java:378)
at org.apache.jasper.compiler.Compiler.compile(Compiler.java:353)
at org.apache.jasper.compiler.Compiler.compile(Compiler.java:340)
at org.apache.jasper.JspCompilationContext.compile(JspCompilationContext.java:646)
at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:357)
at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:390)
at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:334)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:722)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:305)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:225)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:123)
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:472)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:168)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:98)
at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:927)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:407)
at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1001)
at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:579)
at org.apache.tomcat.util.net.AprEndpoint$SocketProcessor.run(AprEndpoint.java:1770)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1110)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:603)
at java.lang.Thread.run(Thread.java:722)
