问 如何用slf4j记录postgres驱动程序消息？

    <dependency>
        <groupId>org.slf4j</groupId>
        <artifactId>slf4j-api</artifactId>
        <version>1.7.5</version>
    </dependency>
    <dependency>
        <groupId>org.slf4j</groupId>
        <artifactId>jul-to-slf4j</artifactId>
        <version>1.7.5</version>
    </dependency>
    <dependency>
        <groupId>ch.qos.logback</groupId>
        <artifactId>logback-classic</artifactId>
        <version>1.0.13</version>
    </dependency>

Nov 17, 2013 12:32:40 PM org.apache.naming.NamingContext lookup
WARNING: Unexpected exception resolving reference
org.postgresql.util.PSQLException: пїЅпїЅпїЅпїЅпїЅ: пїЅпїЅпїЅпїЅпїЅпїЅпїЅпїЅпїЅпїЅпїЅпїЅ "traffic" пїЅпїЅ пїЅпїЅпїЅпїЅпїЅпїЅ пїЅпїЅпїЅпїЅпїЅпїЅпїЅпїЅ пїЅпїЅпїЅпїЅпїЅпїЅпїЅпїЅпїЅпїЅпїЅ (пїЅпїЅ пїЅпїЅпїЅпїЅпїЅпїЅ)
    at org.postgresql.core.v3.ConnectionFactoryImpl.doAuthentication(ConnectionFactoryImpl.java:291)
    at org.postgresql.core.v3.ConnectionFactoryImpl.openConnectionImpl(ConnectionFactoryImpl.java:108)
    at org.postgresql.core.ConnectionFactory.openConnection(ConnectionFactory.java:66)
    at org.postgresql.jdbc2.AbstractJdbc2Connection.<init>(AbstractJdbc2Connection.java:125)
    at org.postgresql.jdbc3.AbstractJdbc3Connection.<init>(AbstractJdbc3Connection.java:30)
    at org.postgresql.jdbc3g.AbstractJdbc3gConnection.<init>(AbstractJdbc3gConnection.java:22)
    at org.postgresql.jdbc4.AbstractJdbc4Connection.<init>(AbstractJdbc4Connection.java:30)
    at org.postgresql.jdbc4.Jdbc4Connection.<init>(Jdbc4Connection.java:24)
    at org.postgresql.Driver.makeConnection(Driver.java:393)
    at org.postgresql.Driver.connect(Driver.java:267)
    at org.apache.tomcat.jdbc.pool.PooledConnection.connectUsingDriver(PooledConnection.java:267)
    [...skipped...]
 javax.management.remote.rmi.RMIConnectionImpl.doPrivilegedOperation(RMIConnectionImpl.java:1420)
    at javax.management.remote.rmi.RMIConnectionImpl.invoke(RMIConnectionImpl.java:848)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:606)
    at sun.rmi.server.UnicastServerRef.dispatch(UnicastServerRef.java:322)
    at sun.rmi.transport.Transport$1.run(Transport.java:177)
    at sun.rmi.transport.Transport$1.run(Transport.java:174)
    at java.security.AccessController.doPrivileged(Native Method)
    at sun.rmi.transport.Transport.serviceCall(Transport.java:173)
    at sun.rmi.transport.tcp.TCPTransport.handleMessages(TCPTransport.java:556)
    at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run0(TCPTransport.java:811)
    at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run(TCPTransport.java:670)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
    at java.lang.Thread.run(Thread.java:724)
Nov 17, 2013 12:32:40 PM org.apache.catalina.core.NamingContextListener addResource
WARNING: Failed to register in JMX: javax.naming.NamingException: пїЅпїЅпїЅпїЅпїЅ: пїЅпїЅпїЅпїЅпїЅпїЅпїЅпїЅпїЅпїЅпїЅпїЅ "traffic" пїЅпїЅ пїЅпїЅпїЅпїЅпїЅпїЅ пїЅпїЅпїЅпїЅпїЅпїЅпїЅпїЅ пїЅпїЅпїЅпїЅпїЅпїЅпїЅпїЅпїЅпїЅпїЅ (пїЅпїЅ пїЅпїЅпїЅпїЅпїЅпїЅ)

<?xml version="1.0" encoding="UTF-8"?>
<configuration>
    <property name="destination" value="${catalina.base:-./temp}/logs/billing" />
    <appender name="STDOUT" class="ch.qos.logback.core.ConsoleAppender">
        <encoder class="ch.qos.logback.classic.encoder.PatternLayoutEncoder">
            <pattern>%d{HH:mm:ss.SSS} [%thread] %-5level %logger{36} - %msg%n</pattern>
        </encoder>
    </appender>
    <appender name="ROLLING" class="ch.qos.logback.core.rolling.RollingFileAppender">
        <file>${destination}.log</file>
        <encoder class="ch.qos.logback.classic.encoder.PatternLayoutEncoder">
            <pattern>%d{HH:mm:ss.SSS} [%thread] %-5level %logger{36} - %msg%n</pattern>
        </encoder>
        <rollingPolicy class="ch.qos.logback.core.rolling.TimeBasedRollingPolicy">
            <fileNamePattern>${destination}-%d{yyyy-MM-dd}.%i.log</fileNamePattern>
            <maxHistory>30</maxHistory>
        </rollingPolicy>
        <timeBasedFileNamingAndTriggeringPolicy class="ch.qos.logback.core.rolling.SizeAndTimeBasedFNATP">
            <maxFileSize>100MB</maxFileSize>
        </timeBasedFileNamingAndTriggeringPolicy>
    </appender>
    <logger name="net.kerba" level="TRACE"/>
    <logger name="org" level="INFO" />
    <root level="debug">
        <appender-ref ref="STDOUT" />
        <appender-ref ref="ROLLING" />
    </root>
</configuration>

D:\opt\apache-tomcat-7.0.25\bin\catalina.bat run
[2013-11-17 12:32:31,305] Artifact billing-filter:war exploded: Server is not connected. Deploy is not available.
Using CATALINA_BASE:   "D:\home\kerb\.IntelliJIdea12\system\tomcat\Unnamed_billing-filter"
Using CATALINA_HOME:   "D:\opt\apache-tomcat-7.0.25"
Using CATALINA_TMPDIR: "D:\opt\apache-tomcat-7.0.25\temp"
Using JRE_HOME:        "C:\Program Files\Java\jdk1.7.0_40"
Using CLASSPATH:       "D:\opt\apache-tomcat-7.0.25\bin\bootstrap.jar;D:\opt\apache-tomcat-7.0.25\bin\tomcat-juli.jar"
Connected to the target VM, address: '127.0.0.1:52288', transport: 'socket'
Nov 17, 2013 12:32:32 PM org.apache.catalina.core.AprLifecycleListener init
INFO: The APR based Apache Tomcat Native library which allows optimal performance in production environments was not found on the java.library.path: C:\Program Files\Java\jdk1.7.0_40\bin;C:\Windows\Sun\Java\bin;C:\Windows\system32;C:\Windows;C:\Program Files (x86)\JetBrains\IntelliJ IDEA 12.1\bin\..\.\bin;C:\Windows\system32;C:\Windows;C:\Windows\System32\Wbem;C:\Windows\System32\WindowsPowerShell\v1.0\;C:\Program Files (x86)\pgmodeler\lib;C:\Program Files (x86)\GammaTech\TumarCSP\lib;C:\Program Files (x86)\GammaTech\TumarCSP\lib64;C:\Program Files\MySQL\MySQL Server 5.1\bin;C:\Program Files\erl5.10.2\bin;C:\Program Files\SlikSvn\bin;C:\Program Files\OpenVPN\bin;C:\Program Files\TortoiseHg\;D:\opt\maven3\bin;D:\opt\instantclient_11_2;D:\opt\wget\bin;D:\opt\conemu;C:\Program Files\Far Manager;C:\Program Files\PostgreSQL\9.2\bin;C:\Program Files (x86)\cwRsync\bin;C:\Program Files\WinRAR;C:\Program Files\7-Zip;c:\program files\java\jdk1.7.0_40\jre\bin;.
Nov 17, 2013 12:32:32 PM org.apache.coyote.AbstractProtocol init
INFO: Initializing ProtocolHandler ["http-bio-8080"]
Nov 17, 2013 12:32:32 PM org.apache.coyote.AbstractProtocol init
INFO: Initializing ProtocolHandler ["ajp-bio-8009"]
Nov 17, 2013 12:32:32 PM org.apache.catalina.startup.Catalina load
INFO: Initialization processed in 900 ms
Nov 17, 2013 12:32:32 PM org.apache.catalina.core.StandardService startInternal
INFO: Starting service Catalina
Nov 17, 2013 12:32:32 PM org.apache.catalina.core.StandardEngine startInternal
INFO: Starting Servlet Engine: Apache Tomcat/7.0.25
Nov 17, 2013 12:32:32 PM org.apache.coyote.AbstractProtocol start
INFO: Starting ProtocolHandler ["http-bio-8080"]
Nov 17, 2013 12:32:32 PM org.apache.coyote.AbstractProtocol start
INFO: Starting ProtocolHandler ["ajp-bio-8009"]
Nov 17, 2013 12:32:32 PM org.apache.catalina.startup.Catalina start
INFO: Server startup in 49 ms
Connected to server
[2013-11-17 12:32:32,966] Artifact billing-filter:war exploded: Artifact is being deployed, please wait...
12:32:38,593 |-INFO in ch.qos.logback.classic.LoggerContext[default] - Could NOT find resource [logback.groovy]
12:32:38,594 |-INFO in ch.qos.logback.classic.LoggerContext[default] - Could NOT find resource [logback-test.xml]
12:32:38,594 |-INFO in ch.qos.logback.classic.LoggerContext[default] - Found resource [logback.xml] at [file:/D:/projects/billing-filter/target/check2/WEB-INF/classes/logback.xml]
12:32:38,612 |-INFO in ch.qos.logback.classic.joran.action.ConfigurationAction - debug attribute not set
12:32:38,617 |-INFO in ch.qos.logback.core.joran.action.AppenderAction - About to instantiate appender of type [ch.qos.logback.core.ConsoleAppender]
12:32:38,618 |-INFO in ch.qos.logback.core.joran.action.AppenderAction - Naming appender as [STDOUT]
12:32:38,662 |-INFO in ch.qos.logback.core.joran.action.AppenderAction - About to instantiate appender of type [ch.qos.logback.core.rolling.RollingFileAppender]
12:32:38,662 |-INFO in ch.qos.logback.core.joran.action.AppenderAction - Naming appender as [ROLLING]
12:32:38,685 |-INFO in c.q.l.core.rolling.TimeBasedRollingPolicy - No compression will be used
12:32:38,686 |-INFO in c.q.l.core.rolling.TimeBasedRollingPolicy - Will use the pattern D:/home/kerb/.IntelliJIdea12/system/tomcat/Unnamed_billing-filter/logs/billing-%d{yyyy-MM-dd}.%i.log for the active file
12:32:38,688 |-INFO in c.q.l.core.rolling.DefaultTimeBasedFileNamingAndTriggeringPolicy - The date pattern is 'yyyy-MM-dd' from file name pattern 'D:/home/kerb/.IntelliJIdea12/system/tomcat/Unnamed_billing-filter/logs/billing-%d{yyyy-MM-dd}.%i.log'.
12:32:38,688 |-INFO in c.q.l.core.rolling.DefaultTimeBasedFileNamingAndTriggeringPolicy - Roll-over at midnight.
12:32:38,688 |-INFO in c.q.l.core.rolling.DefaultTimeBasedFileNamingAndTriggeringPolicy - Setting initial period to Sun Nov 17 12:25:59 ALMT 2013
12:32:38,689 |-ERROR in ch.qos.logback.core.joran.spi.Interpreter@20:107 - no applicable action for [timeBasedFileNamingAndTriggeringPolicy], current ElementPath  is [[configuration][appender][timeBasedFileNamingAndTriggeringPolicy]]
12:32:38,689 |-ERROR in ch.qos.logback.core.joran.spi.Interpreter@21:26 - no applicable action for [maxFileSize], current ElementPath  is [[configuration][appender][timeBasedFileNamingAndTriggeringPolicy][maxFileSize]]
12:32:38,690 |-INFO in ch.qos.logback.core.rolling.RollingFileAppender[ROLLING] - Active log file name: D:\home\kerb\.IntelliJIdea12\system\tomcat\Unnamed_billing-filter/logs/billing.log
12:32:38,690 |-INFO in ch.qos.logback.core.rolling.RollingFileAppender[ROLLING] - File property is set to [D:\home\kerb\.IntelliJIdea12\system\tomcat\Unnamed_billing-filter/logs/billing.log]
12:32:38,691 |-INFO in ch.qos.logback.classic.joran.action.LoggerAction - Setting level of logger [net.kerba] to TRACE
12:32:38,691 |-INFO in ch.qos.logback.classic.joran.action.LoggerAction - Setting level of logger [org] to INFO
12:32:38,691 |-INFO in ch.qos.logback.classic.joran.action.RootLoggerAction - Setting level of ROOT logger to DEBUG
12:32:38,691 |-INFO in ch.qos.logback.core.joran.action.AppenderRefAction - Attaching appender named [STDOUT] to Logger[ROOT]
12:32:38,692 |-INFO in ch.qos.logback.core.joran.action.AppenderRefAction - Attaching appender named [ROLLING] to Logger[ROOT]
12:32:38,692 |-INFO in ch.qos.logback.classic.joran.action.ConfigurationAction - End of configuration.
12:32:38,692 |-INFO in ch.qos.logback.classic.joran.JoranConfigurator@2f163915 - Registering current configuration as safe fallback point
12:32:38.697 [RMI TCP Connection(3)-127.0.0.1] WARN  o.a.tomcat.jdbc.pool.ConnectionPool - maxIdle is smaller than minIdle, setting maxIdle to: 10
Nov 17, 2013 12:32:40 PM org.apache.naming.NamingContext lookup
WARNING: Unexpected exception resolving reference
org.postgresql.util.PSQLException: пїЅпїЅпїЅпїЅпїЅ: пїЅпїЅпїЅпїЅпїЅпїЅпїЅпїЅпїЅпїЅпїЅпїЅ "traffic" пїЅпїЅ пїЅпїЅпїЅпїЅпїЅпїЅ пїЅпїЅпїЅпїЅпїЅпїЅпїЅпїЅ пїЅпїЅпїЅпїЅпїЅпїЅпїЅпїЅпїЅпїЅпїЅ (пїЅпїЅ пїЅпїЅпїЅпїЅпїЅпїЅ)
    at org.postgresql.core.v3.ConnectionFactoryImpl.doAuthentication(ConnectionFactoryImpl.java:291)
    at org.postgresql.core.v3.ConnectionFactoryImpl.openConnectionImpl(ConnectionFactoryImpl.java:108)
[... skipped ...]
Nov 17, 2013 12:32:40 PM org.apache.catalina.core.NamingContextListener addResource
WARNING: Failed to register in JMX: javax.naming.NamingException: пїЅпїЅпїЅпїЅпїЅ: пїЅпїЅпїЅпїЅпїЅпїЅпїЅпїЅпїЅпїЅпїЅпїЅ "traffic" пїЅпїЅ пїЅпїЅпїЅпїЅпїЅпїЅ пїЅпїЅпїЅпїЅпїЅпїЅпїЅпїЅ пїЅпїЅпїЅпїЅпїЅпїЅпїЅпїЅпїЅпїЅпїЅ (пїЅпїЅ пїЅпїЅпїЅпїЅпїЅпїЅ)
12:32:40.211 [RMI TCP Connection(3)-127.0.0.1] INFO  o.a.c.c.C.[Catalina].[localhost].[/] - No Spring WebApplicationInitializer types detected on classpath
12:32:40.330 [RMI TCP Connection(3)-127.0.0.1] INFO  o.a.c.c.C.[Catalina].[localhost].[/] - Initializing Spring FrameworkServlet 'dispatcher'
12:32:40.330 [RMI TCP Connection(3)-127.0.0.1] INFO  o.s.web.servlet.DispatcherServlet - FrameworkServlet 'dispatcher': initialization started
12:32:40.343 [RMI TCP Connection(3)-127.0.0.1] INFO  o.s.w.c.s.XmlWebApplicationContext - Refreshing WebApplicationContext for namespace 'dispatcher-servlet': startup date [Sun Nov 17 12:32:40 ALMT 2013]; root of context hierarchy
12:32:40.361 [RMI TCP Connection(3)-127.0.0.1] INFO  o.s.b.f.xml.XmlBeanDefinitionReader - Loading XML bean definitions from ServletContext resource [/WEB-INF/dispatcher-servlet.xml]
12:32:40.631 [RMI TCP Connection(3)-127.0.0.1] INFO  o.s.b.f.s.DefaultListableBeanFactory - Pre-instantiating singletons in org.springframework.beans.factory.support.DefaultListableBeanFactory@36db4683: defining beans [searchController,informationProviderRegistry,sessionDataHolder,org.springframework.context.annotation.internalConfigurationAnnotationProcessor,org.springframework.context.annotation.internalAutowiredAnnotationProcessor,org.springframework.context.annotation.internalRequiredAnnotationProcessor,org.springframework.context.annotation.internalCommonAnnotationProcessor,viewResolver,org.springframework.context.annotation.ConfigurationClassPostProcessor.importAwareProcessor]; root of factory hierarchy
12:32:40.765 [RMI TCP Connection(3)-127.0.0.1] INFO  o.s.w.s.m.a.DefaultAnnotationHandlerMapping - Mapped URL path [/search/by-name] onto handler 'searchController'
12:32:40.766 [RMI TCP Connection(3)-127.0.0.1] INFO  o.s.w.s.m.a.DefaultAnnotationHandlerMapping - Mapped URL path [/search/by-name.*] onto handler 'searchController'
12:32:40.766 [RMI TCP Connection(3)-127.0.0.1] INFO  o.s.w.s.m.a.DefaultAnnotationHandlerMapping - Mapped URL path [/search/by-name/] onto handler 'searchController'
12:32:40.766 [RMI TCP Connection(3)-127.0.0.1] INFO  o.s.w.s.m.a.DefaultAnnotationHandlerMapping - Mapped URL path [/search/by-host] onto handler 'searchController'
12:32:40.766 [RMI TCP Connection(3)-127.0.0.1] INFO  o.s.w.s.m.a.DefaultAnnotationHandlerMapping - Mapped URL path [/search/by-host.*] onto handler 'searchController'
12:32:40.767 [RMI TCP Connection(3)-127.0.0.1] INFO  o.s.w.s.m.a.DefaultAnnotationHandlerMapping - Mapped URL path [/search/by-host/] onto handler 'searchController'
12:32:40.767 [RMI TCP Connection(3)-127.0.0.1] INFO  o.s.w.s.m.a.DefaultAnnotationHandlerMapping - Mapped URL path [/search/hostname-traffic-details/{uuid}] onto handler 'searchController'
12:32:40.767 [RMI TCP Connection(3)-127.0.0.1] INFO  o.s.w.s.m.a.DefaultAnnotationHandlerMapping - Mapped URL path [/search/hostname-traffic-details/{uuid}.*] onto handler 'searchController'
12:32:40.767 [RMI TCP Connection(3)-127.0.0.1] INFO  o.s.w.s.m.a.DefaultAnnotationHandlerMapping - Mapped URL path [/search/hostname-traffic-details/{uuid}/] onto handler 'searchController'
12:32:40.768 [RMI TCP Connection(3)-127.0.0.1] INFO  o.s.w.s.m.a.DefaultAnnotationHandlerMapping - Mapped URL path [/search/download/{uuid}] onto handler 'searchController'
12:32:40.768 [RMI TCP Connection(3)-127.0.0.1] INFO  o.s.w.s.m.a.DefaultAnnotationHandlerMapping - Mapped URL path [/search/download/{uuid}.*] onto handler 'searchController'
12:32:40.768 [RMI TCP Connection(3)-127.0.0.1] INFO  o.s.w.s.m.a.DefaultAnnotationHandlerMapping - Mapped URL path [/search/download/{uuid}/] onto handler 'searchController'
12:32:40.769 [RMI TCP Connection(3)-127.0.0.1] INFO  o.s.w.s.m.a.DefaultAnnotationHandlerMapping - Mapped URL path [/search] onto handler 'searchController'
12:32:40.769 [RMI TCP Connection(3)-127.0.0.1] INFO  o.s.w.s.m.a.DefaultAnnotationHandlerMapping - Mapped URL path [/search.*] onto handler 'searchController'
12:32:40.769 [RMI TCP Connection(3)-127.0.0.1] INFO  o.s.w.s.m.a.DefaultAnnotationHandlerMapping - Mapped URL path [/search/] onto handler 'searchController'
12:32:40.769 [RMI TCP Connection(3)-127.0.0.1] INFO  o.s.w.s.m.a.DefaultAnnotationHandlerMapping - Mapped URL path [/search/.*] onto handler 'searchController'
12:32:40.770 [RMI TCP Connection(3)-127.0.0.1] INFO  o.s.w.s.m.a.DefaultAnnotationHandlerMapping - Mapped URL path [/search/city/{city}] onto handler 'searchController'
12:32:40.770 [RMI TCP Connection(3)-127.0.0.1] INFO  o.s.w.s.m.a.DefaultAnnotationHandlerMapping - Mapped URL path [/search/city/{city}.*] onto handler 'searchController'
12:32:40.770 [RMI TCP Connection(3)-127.0.0.1] INFO  o.s.w.s.m.a.DefaultAnnotationHandlerMapping - Mapped URL path [/search/city/{city}/] onto handler 'searchController'
12:32:40.771 [RMI TCP Connection(3)-127.0.0.1] INFO  o.s.w.s.m.a.DefaultAnnotationHandlerMapping - Mapped URL path [/search/by-ip] onto handler 'searchController'
12:32:40.771 [RMI TCP Connection(3)-127.0.0.1] INFO  o.s.w.s.m.a.DefaultAnnotationHandlerMapping - Mapped URL path [/search/by-ip.*] onto handler 'searchController'
12:32:40.771 [RMI TCP Connection(3)-127.0.0.1] INFO  o.s.w.s.m.a.DefaultAnnotationHandlerMapping - Mapped URL path [/search/by-ip/] onto handler 'searchController'
12:32:40.771 [RMI TCP Connection(3)-127.0.0.1] INFO  o.s.w.s.m.a.DefaultAnnotationHandlerMapping - Mapped URL path [/search/ip-traffic-details/{uuid}] onto handler 'searchController'
12:32:40.772 [RMI TCP Connection(3)-127.0.0.1] INFO  o.s.w.s.m.a.DefaultAnnotationHandlerMapping - Mapped URL path [/search/ip-traffic-details/{uuid}.*] onto handler 'searchController'
12:32:40.772 [RMI TCP Connection(3)-127.0.0.1] INFO  o.s.w.s.m.a.DefaultAnnotationHandlerMapping - Mapped URL path [/search/ip-traffic-details/{uuid}/] onto handler 'searchController'
12:32:40.772 [RMI TCP Connection(3)-127.0.0.1] INFO  o.s.w.s.m.a.DefaultAnnotationHandlerMapping - Mapped URL path [/search/as-excel/{uuid}] onto handler 'searchController'
12:32:40.772 [RMI TCP Connection(3)-127.0.0.1] INFO  o.s.w.s.m.a.DefaultAnnotationHandlerMapping - Mapped URL path [/search/as-excel/{uuid}.*] onto handler 'searchController'
12:32:40.773 [RMI TCP Connection(3)-127.0.0.1] INFO  o.s.w.s.m.a.DefaultAnnotationHandlerMapping - Mapped URL path [/search/as-excel/{uuid}/] onto handler 'searchController'
12:32:41.058 [RMI TCP Connection(3)-127.0.0.1] INFO  o.s.web.servlet.DispatcherServlet - FrameworkServlet 'dispatcher': initialization completed in 728 ms
[2013-11-17 12:32:41,096] Artifact billing-filter:war exploded: Artifact is deployed successfully
12:32:42.416 [http-bio-8080-exec-1] INFO  o.a.j.compiler.TldLocationsCache - At least one JAR was scanned for TLDs yet contained no TLDs. Enable debug logging for this logger for a complete list of JARs that were scanned but no TLDs were found in them. Skipping unneeded JARs during scanning can improve startup time and JSP compilation time.