tomcat无法正常关闭问题分析及解决

# sh bin/shutdown.sh 
Using CATALINA_BASE:   /usr/local/apache-tomcat-7.0.59
Using CATALINA_HOME:   /usr/local/apache-tomcat-7.0.59
Using CATALINA_TMPDIR: /usr/local/apache-tomcat-7.0.59/temp
Using JRE_HOME:        /usr/local/jdk1.8.0_121
Using CLASSPATH:       /usr/local/apache-tomcat-7.0.59/bin/bootstrap.jar:/usr/local/apache-tomcat-7.0.59/bin/tomcat-juli.jar

# ps uax |grep tomcat
root       1199  0.0  0.0   9120   468 ?        Ss   21:53   0:00 /sbin/dhclient -H centosx64_tomcat1 -1 -q -lf /var/lib/dhclient/dhclient-eth2.leases -pf /var/run/dhclient-eth2.pid eth2
root       2081  9.7 60.7 2192828 295224 pts/0  Sl   22:04   1:04 /usr/local/jdk1.8.0_121/bin/java -Djava.util.logging.config.file=/usr/local/apache-tomcat-7.0.59/conf/logging.properties -Djava.util.logging.manager=org.apache.juli.ClassLoaderLogManager -Dmoc.debug=true -Djava.endorsed.dirs=/usr/local/apache-tomcat-7.0.59/endorsed -classpath /usr/local/apache-tomcat-7.0.59/bin/bootstrap.jar:/usr/local/apache-tomcat-7.0.59/bin/tomcat-juli.jar -Dcatalina.base=/usr/local/apache-tomcat-7.0.59 -Dcatalina.home=/usr/local/apache-tomcat-7.0.59 -Djava.io.tmpdir=/usr/local/apache-tomcat-7.0.59/temp org.apache.catalina.startup.Bootstrap start
root       2192  0.0  0.1 103332   848 pts/0    S+   22:15   0:00 grep tomcat

PRGDIR=`dirname "$PRG"`
EXECUTABLE=catalina.sh

# Check that target executable exists
if $os400; then
  # -x will Only work on the os400 if the files are:
  # 1. owned by the user
  # 2. owned by the PRIMARY group of the user
  # this will not work if the user belongs in secondary groups
  eval
else
  if [ ! -x "$PRGDIR"/"$EXECUTABLE" ]; then
    echo "Cannot find $PRGDIR/$EXECUTABLE"
    echo "The file is absent or does not have execute permission"
    echo "This file is needed to run this program"
    exit 1
  fi
fi

exec "$PRGDIR"/"$EXECUTABLE" stop "$@"

eval "\"$_RUNJAVA\"" $LOGGING_MANAGER $JAVA_OPTS \
    -Djava.endorsed.dirs="\"$JAVA_ENDORSED_DIRS\"" -classpath "\"$CLASSPATH\"" \
    -Dcatalina.base="\"$CATALINA_BASE\"" \
    -Dcatalina.home="\"$CATALINA_HOME\"" \
    -Djava.io.tmpdir="\"$CATALINA_TMPDIR\"" \
    org.apache.catalina.startup.Bootstrap "$@" stop
# stop failed. Shutdown port disabled? Try a normal kill.
  if [ $? != 0 ]; then
    if [ ! -z "$CATALINA_PID" ]; then
      echo "The stop command failed. Attempting to signal the process to stop through OS signal."
      kill -15 `cat "$CATALINA_PID"` >/dev/null 2>&1
    fi
  fi

if (command.equals("startd")) {
    args[args.length - 1] = "start";
    daemon.load(args);
    daemon.start();
} else if (command.equals("stopd")) {
    args[args.length - 1] = "stop";
    daemon.stop();
} else if (command.equals("start")) {
    daemon.setAwait(true);
    daemon.load(args);
    daemon.start();
} else if (command.equals("stop")) {
    daemon.stopServer(args);
} else if (command.equals("configtest")) {
    daemon.load(args);
if (null==daemon.getServer()) {
    System.exit(1);
}
    System.exit(0);
} else {
    log.warn("Bootstrap: command \"" + command + "\" does not exist.");
}

/**
 * Stop the standalone server.
 * @param arguments Command line arguments
 * @throws Exception Fatal stop error
 */
public void stopServer(String[] arguments)
    throws Exception {

    Object param[];
    Class<?> paramTypes[];
    if (arguments==null || arguments.length==0) {
        paramTypes = null;
        param = null;
    } else {
        paramTypes = new Class[1];
        paramTypes[0] = arguments.getClass();
        param = new Object[1];
        param[0] = arguments;
    }
    Method method =
    catalinaDaemon.getClass().getMethod("stopServer", paramTypes);
    method.invoke(catalinaDaemon, param);
}

public void stopServer(String[] arguments) {

    if (arguments != null) {
        arguments(arguments);
    }
    Server s = getServer();
    if (s == null) {
        // Create and execute our Digester
        Digester digester = createStopDigester();
        File file = configFile();
        try (FileInputStream fis = new FileInputStream(file)) {
            InputSource is =
            new InputSource(file.toURI().toURL().toString());
            is.setByteStream(fis);
            digester.push(this);
            digester.parse(is);
        } catch (Exception e) {
            log.error("Catalina.stop: ", e);
            System.exit(1);
        }
    } else {
        // Server object already present. Must be running as a service
        try {
            s.stop();
        } catch (LifecycleException e) {
            log.error("Catalina.stop: ", e);
        }
        return;
    }

    // Stop the existing server
    s = getServer();
    if (s.getPort()>0) {
        try (Socket socket = new Socket(s.getAddress(), s.getPort());
            OutputStream stream = socket.getOutputStream()) {
            String shutdown = s.getShutdown();
            for (int i = 0; i < shutdown.length(); i++) {
                stream.write(shutdown.charAt(i));
            }
            stream.flush();
        } catch (ConnectException ce) {
            log.error(sm.getString("catalina.stopServer.connectException",
                                       s.getAddress(),
                                       String.valueOf(s.getPort())));
            log.error("Catalina.stop: ", ce);
            System.exit(1);
        } catch (IOException e) {
            log.error("Catalina.stop: ", e);
            System.exit(1);
        }
    } else {
        log.error(sm.getString("catalina.stopServer"));
        System.exit(1);
    }
}

public class ResListener implements ServletContextListener {
    public void contextInitialized(ServletContextEvent sce) {
        //TODO：初始化资源
    }

    // 释放资源,否则容器无法正常关闭
    public void contextDestroyed(ServletContextEvent sce) {
        //TODO：释放资源
    }
}