java - Tomcat 8 上下文初始化两次

Question

我有一个在 Tomcat 8.0 上运行的 Java 8 网络应用程序。项目中定义了一个context listener类，方法如下:

类:

public class ...ContextListener implements ServletContextListener {
    private static Log log = LogFactory.getLog(...ContextListener.class);

    public void contextInitialized(ServletContext sce) {
        log.info("HOSTNAME:" + ...Utils.getHostName());
        ...
    }
}

web.xml:

<web-app ...>
    <listener>
        <listener-class>...ContextListener</listener-class>
    </listener>
</web-app>

启动应用程序时，我在日志中看到上下文监听器类(以及上下文监听器实例化的每个其他类)中的每条日志消息都打印了两次:

03/02/2017 17:47:07  INFO - HOSTNAME:...win
03/02/2017 17:47:07  INFO - HOSTNAME:...win
03/02/2017 17:47:07  INFO - Starting Coordinator ...
03/02/2017 17:47:07  INFO - Starting Coordinator ...
03/02/2017 17:47:07  INFO - Coordinator.start was called
03/02/2017 17:47:07  INFO - Coordinator.start was called
03/02/2017 17:47:07  INFO - Coordinator was started!
03/02/2017 17:47:07  INFO - Coordinator was started!
03/02/2017 17:47:11  INFO - Setting the workCounter=0
03/02/2017 17:47:11  INFO - Setting the workCounter=0

这对我的应用程序来说很糟糕，因为它应该启动一个协调器线程，而协调器线程(顾名思义)又会协调其他不同的线程。

我尝试阅读 Tomcat 的配置指南，并尝试使用 autoDeploy 和 deployOnStartup 属性以及不同的上下文设置，但无济于事。

Tomcat/conf/context.xml:

<Context>
    ....
    <WatchedResource>WEB-INF/web.xml</WatchedResource>
    <WatchedResource>${catalina.base}/conf/web.xml</WatchedResource>
    <ResourceLink name="..." global="..." type="javax.sql.DataSource"/>
    <ResourceLink name="..." global="..." type="javax.sql.DataSource"/>
    <ResourceLink name="..." global="..." type="javax.sql.DataSource"/>
    <ResourceLink name="..." global="..." type="javax.sql.DataSource"/>
    <ResourceLink name="..." global="..." type="javax.sql.DataSource"/>
    ...
</Context>

ResourceLink 标记是此应用程序以及其他一些应用程序的 JDBC 数据源。

Tomcat/conf/server.xml:

<Server port="9006" shutdown="SHUTDOWN">
  <Listener className="org.apache.catalina.startup.VersionLoggerListener" />
  <Listener className="org.apache.catalina.core.AprLifecycleListener" SSLEngine="on" />
  <Listener className="org.apache.catalina.core.JreMemoryLeakPreventionListener" />
  <Listener className="org.apache.catalina.mbeans.GlobalResourcesLifecycleListener" />
  <Listener className="org.apache.catalina.core.ThreadLocalLeakPreventionListener" />
  <GlobalNamingResources>

<Resource name="UserDatabase" auth="Container"
              type="org.apache.catalina.UserDatabase"
              description="User database that can be updated and saved"
              factory="org.apache.catalina.users.MemoryUserDatabaseFactory"
              pathname="conf/tomcat-users.xml" />

    <Resource name="..." auth="Container" type="javax.sql.DataSource"
           factory="...EncryptedDataSourceFactory"
           username="..." password="..."
           driverClassName="oracle.jdbc.driver.OracleDriver"
           url="..." maxWait="1000" removeAbandoned="true"
           maxActive="100" maxIdle="5" removeAbandonedTimeout="60"
           logAbandoned="true" validationQuery="SELECT 1 from DUAL"
           testOnBorrow="true" testWhileIdle="true" numTestsPerEvictionRun="3" timeBetweenEvictionRunsMillis="30000"
           minEvictableIdleTimeMilli="150000" defaultAutoCommit="true"/>      

    <Resource name="..." auth="Container" type="javax.sql.DataSource"
           factory="...EncryptedDataSourceFactory"
           username="..." password="..."
           driverClassName="oracle.jdbc.driver.OracleDriver"
           url="..." maxWait="1000" removeAbandoned="true"
           maxActive="100" maxIdle="5" removeAbandonedTimeout="60"
           logAbandoned="true" validationQuery="SELECT 1 from DUAL"
           testOnBorrow="true" testWhileIdle="true" numTestsPerEvictionRun="3" timeBetweenEvictionRunsMillis="30000"
           minEvictableIdleTimeMilli="150000" defaultAutoCommit="true"/>

  </GlobalNamingResources>

  <Service name="Catalina">
    <Connector port="9081" protocol="HTTP/1.1"
               connectionTimeout="20000"
               redirectPort="9444" />

    <Connector port="9010" protocol="AJP/1.3" redirectPort="9444" />

    <Engine name="Catalina" defaultHost="localhost">

      <Realm className="org.apache.catalina.realm.LockOutRealm">
        <Realm className="org.apache.catalina.realm.UserDatabaseRealm"
               resourceName="UserDatabase"/>
      </Realm>

      <Host name="localhost"  appBase="webapps" unpackWARs="true">
        <Valve className="org.apache.catalina.valves.AccessLogValve" directory="logs"
               prefix="localhost_access_log" suffix=".txt"
               pattern="%h %l %u %t &quot;%r&quot; %s %b" />

      </Host>
    </Engine>
  </Service>
</Server>

完全是“原创”的，只是改了端口(因为这台服务器上还有其他的tomcat在运行)。

应用程序本身不包含context.xml 文件，所以我真的不明白为什么要对context 进行两次初始化。更奇怪的是，在 Tomcat 7 上它没有发生，我现在所做的就是将项目的 Java 版本更改为 8，将 Tomcat 版本更改为 8。

如果您能提供任何帮助，我将不胜感激。

Answer 1

感谢 pedrofb 的评论，我意识到我只有重复的日志条目，而不是双重初始化。 log4j 配置是这样的:

log4j.logger...package.subpackage1=INFO,LOGFILE
log4j.logger...package.subpackage2=INFO,LOGFILE

log4j.appender.LOGFILE=org.apache.log4j.RollingFileAppender
...

这就是日志消息出现两次的原因。