tomcat简单优化

我的优化配置：

JAVA_OPTS="-Xms16384m -Xmx16384m -Xloggc:/home/soft/8080_gc.log -Xss256k -Xmn6144m -XX:PermSize=1024m -XX:MaxPermSize=1024m -XX:SurvivorRatio=6 -XX:MaxTenuringThreshold=7 -XX:+UseConcMarkSweepGC -XX:+UseParNewGC -XX:CMSFullGCsBeforeCompaction=0 -XX:+UseCMSCompactAtFullCollection -XX:CMSInitiatingOccupancyFraction=60 -XX:+CMSClassUnloadingEnabled -XX:SoftRefLRUPolicyMSPerMB=0 -XX:TargetSurvivorRatio=90 -XX:+PrintGCDetails -XX:+PrintGCTimeStamps -XX:+PrintHeapAtGC"

Tomcat 优化分为系统优化，Java虚拟机调优,Tomcat本身的优化。

调整tomcat的占用内存

1.编辑catalina.sh文件

vim catalina.sh

2. 查找到tomcat内存参数一行：/ JAVA_OPTS （如果找不到则在第一行写上）

3. 将JAVA_OPTS="-Xms 1024m -Xmx 1520m" 一行的两个参数依据服务器实际内存数量分别进行更改：

- Xms为tomcat启动初始内存，一般为服务器开机后可用空闲内存减去100M

- Xmx为tomcat最大占用内存，一般为服务器开机后可用空闲内存减去50M

一般应该使用物理内存的 80% 作为堆大小。

以上两个参数关系到tomcat承受的访问性能，要根据服务器实际内存情况设定。

Xms和Xmx的值取成一样比较好，可以加快内存回收速度，会常GC

值的大小一般根据需要进行配置。初始化堆的大小执行了虚拟机在启动时向系统申请的内存的大小。一般而言，这个参数不重要。但是有的应用程式在大负载的情况下会急剧地占用更多的内存，此时这个参数就是显得很重要，假如虚拟机启动时配置使用的内存比较小而在这种情况下有许多对象进行初始化，虚拟机就必须重复地增加内存来满足使用。由于这种原因，我们一般把-Xms和-Xmx设为相同大，而堆的最大值受限于系统使用的物理内存。一般使用数据量较大的应用程式会使用持久对象，内存使用有可能迅速地增长。当应用程式需要的内存超出堆的最大值时虚拟机就会提示内存溢出，并且导致应用服务崩溃。因此一般建议堆的最大值配置为可用内存的最大值的80%。

Tomcat默认能够使用的内存为128MB，在实际生产中，这点内存通常是不足的，需要大些

在/bin/catalina.sh中，增加如下配置：
JAVA_OPTS='-Xms[初始化内存大小] -Xmx[能够使用的最大内存]'
需要时，把这个两个参数值调大。例如：
JAVA_OPTS='-Xms256m -Xmx512m'
表示初始化内存为256MB，能够使用的最大内存为512MB。
要考虑的是Java提供的垃圾回收机制。虚拟机的堆大小决定了虚拟机花费在收集垃圾上的时间和频度。收集垃圾能够接受的速度和应用有关，应该通过分析实际的垃圾收集的时间和频率来调整。假如堆的大小很大，那么完全垃圾收集就会很慢，但是频度会降低。假如您把堆的大小和内存的需要一致，完全收集就很快，但是会更加频繁。调整堆大小的的目的是最小化垃圾收集的时间，以在特定的时间内最大化处理客户的请求。在基准测试的时候，为确保最好的性能，要把堆的大小设大，确保垃圾收集不在整个基准测试的过程中出现。
假如系统花费很多的时间收集垃圾，请减小堆大小。一次完全的垃圾收集应该不超过 3-5 秒。假如垃圾收集成为瓶颈，那么需要指定代的大小，检查垃圾收集的周详输出，研究 垃圾收集参数对性能的影响。一般说来，您应该使用物理内存的 80% 作为堆大小。当增加处理器时，记得增加内存，因为分配能够并行进行，而垃圾收集不是并行的。

调整tomcat的线程参数

编辑server.xml文件

在tomcat配置文件server.xml中的配置中，和连接数相关的参数有：

maxThreads="150"，表示最多同时处理150个连接,Tomcat使用线程来处理接收的每个请求。这个值表示Tomcat可创建的最大的线程数。默认值200。
minSpareThreads="25"，表示即使没有人使用也开这么多空线程等待
maxSpareThreads="75"，表示如果最多可以空75个线程，例如某时刻有80人访问，之后没有人访问了，则tomcat不会保留80个空线程，而是关闭5个空的。 （一旦创建的线程超过这个值，Tomcat就会关闭不再需要的socket线程。默认值50）
acceptCount="100"，当同时连接的人数达到maxThreads时，还可以接收排队的连接数量，超过这个连接的则直接返回拒绝连接。（指定当任何能够使用的处理请求的线程数都被使用时，能够放到处理队列中的请求数，超过这个数的请求将不予处理。默认值100）

其中和最大连接数相关的参数为maxThreads和acceptCount。如果要加大并发连接数，应同时加大这两个参数。
web server允许的最大连接数还受制于操作系统的内核参数设置，通常Windows是2000个左右，Linux是1000个左右。tomcat5中的配置示例：
maxThreads="150" minSpareThreads="25" maxSpareThreads="75"
acceptCount="100"/>

主要是调整maxThreads 和acceptCount的值

在tomcat配置文档server.xml中的配置中，和连接数相关的其他参数有：
enableLookups 是否反查域名，默认值为true。为了提高处理能力，应配置为false
connnectionTimeout 网络连接超时，默认值60000，单位：毫秒。配置为0表示永不超时，这样配置有隐患的。通常可配置为30000毫秒。
maxKeepAliveRequests nginx动态的转给tomcat，nginx是不能keepalive的，而tomcat端默认开启了keepalive，会等待keepalive的timeout，默认不设置就是使用connectionTimeout。

所以必须设置tomcat的超时时间，并关闭tomcat的keepalive。否则会产生大量tomcat的socket timewait。
maxKeepAliveRequests="1"就可以避免tomcat产生大量的TIME_WAIT连接，从而从一定程度上避免tomcat假死。
设置tomcat/conf/server.xml：
maxKeepAliveRequests="1"
connectionTimeout="20000"
maxKeepAliveRequests="1" ##表示每个连接只响应一次就关闭，这样就不会等待timeout了

port="8080" protocol="HTTP/1.1"
connectionTimeout="30000" maxKeepAliveRequests="1"
redirectPort="8443" bufferSize="8192" sockedBuffer="65536" acceptCount="200"/>
bufferSize 输入流缓冲大小，默认值2048 bytes。
compression 压缩传输，取值on/off/force，默认值off

贴上我的配置文件：

CATALINA_OPTS="-Dcom.sun.management.jmxremote -Dcom.sun.management.jmxremote.authenticate=false -Dcom.sun.management.jmxremote.ssl=false -Dcom.sun.management.jmxremote.port=12345 -Djava.rmi.server.hostname=10.1.2.131"JAVA_OPTS="-Xms16384m -Xmx16384m -Xloggc:/home/soft/8080_gc.log -Xss256k -Xmn6144m -XX:PermSize=1024m -XX:MaxPermSize=1024m -XX:SurvivorRatio=6 -XX:MaxTenuringThreshold=7 -XX:+UseConcMarkSweepGC -XX:+UseParNewGC -XX:CMSFullGCsBeforeCompaction=0 -XX:+UseCMSCompactAtFullCollection -XX:CMSInitiatingOccupancyFraction=60 -XX:+CMSClassUnloadingEnabled  -XX:SoftRefLRUPolicyMSPerMB=0 -XX:TargetSurvivorRatio=90 -XX:+PrintGCDetails -XX:+PrintGCTimeStamps -XX:+PrintHeapAtGC"#JAVA_OPTS="-Xms4096m -Xmx16384m -XX:MaxPermSize=1024m"# OS specific support.  $var _must_ be set to either true or false.cygwin=falsedarwin=falseos400=falsecase "`uname`" inCYGWIN*) cygwin=true;;Darwin*) darwin=true;;OS400*) os400=true;;esac# resolve links - $0 may be a softlinkPRG="$0"while [ -h "$PRG" ]; do  ls=`ls -ld "$PRG"`  link=`expr "$ls" : '.*-> \(.*\)$'`  if expr "$link" : '/.*' > /dev/null; then    PRG="$link"  else    PRG=`dirname "$PRG"`/"$link"  fidone# Get standard environment variablesPRGDIR=`dirname "$PRG"`# Only set CATALINA_HOME if not already set[ -z "$CATALINA_HOME" ] && CATALINA_HOME=`cd "$PRGDIR/.." >/dev/null; pwd`# Copy CATALINA_BASE from CATALINA_HOME if not already set[ -z "$CATALINA_BASE" ] && CATALINA_BASE="$CATALINA_HOME"# Ensure that neither CATALINA_HOME nor CATALINA_BASE contains a colon# as this is used as the separator in the classpath and Java provides no# mechanism for escaping if the same character appears in the path.case $CATALINA_HOME in  *:*) echo "Using CATALINA_HOME:   $CATALINA_HOME";       echo "Unable to start as CATALINA_HOME contains a colon (:) character";       exit 1;esaccase $CATALINA_BASE in  *:*) echo "Using CATALINA_BASE:   $CATALINA_BASE";       echo "Unable to start as CATALINA_BASE contains a colon (:) character";       exit 1;esac# Ensure that any user defined CLASSPATH variables are not used on startup,# but allow them to be specified in setenv.sh, in rare case when it is needed.CLASSPATH=if [ -r "$CATALINA_BASE/bin/setenv.sh" ]; then  . "$CATALINA_BASE/bin/setenv.sh"elif [ -r "$CATALINA_HOME/bin/setenv.sh" ]; then  . "$CATALINA_HOME/bin/setenv.sh"fi# For Cygwin, ensure paths are in UNIX format before anything is touchedif $cygwin; then  [ -n "$JAVA_HOME" ] && JAVA_HOME=`cygpath --unix "$JAVA_HOME"`  [ -n "$JRE_HOME" ] && JRE_HOME=`cygpath --unix "$JRE_HOME"`  [ -n "$CATALINA_HOME" ] && CATALINA_HOME=`cygpath --unix "$CATALINA_HOME"`  [ -n "$CATALINA_BASE" ] && CATALINA_BASE=`cygpath --unix "$CATALINA_BASE"`  [ -n "$CLASSPATH" ] && CLASSPATH=`cygpath --path --unix "$CLASSPATH"`fi# For OS400if $os400; then  # Set job priority to standard for interactive (interactive - 6) by using  # the interactive priority - 6, the helper threads that respond to requests  # will be running at the same priority as interactive jobs.  COMMAND='chgjob job('$JOBNAME') runpty(6)'  system $COMMAND  # Enable multi threading  export QIBM_MULTI_THREADED=Yfi# Get standard Java environment variablesif $os400; then  # -r will Only work on the os400 if the files are:  # 1. owned by the user  # 2. owned by the PRIMARY group of the user  # this will not work if the user belongs in secondary groups  . "$CATALINA_HOME"/bin/setclasspath.shelse  if [ -r "$CATALINA_HOME"/bin/setclasspath.sh ]; then    . "$CATALINA_HOME"/bin/setclasspath.sh  else    echo "Cannot find $CATALINA_HOME/bin/setclasspath.sh"    echo "This file is needed to run this program"    exit 1  fifi# Add on extra jar files to CLASSPATHif [ ! -z "$CLASSPATH" ] ; then  CLASSPATH="$CLASSPATH":fiCLASSPATH="$CLASSPATH""$CATALINA_HOME"/bin/bootstrap.jarif [ -z "$CATALINA_OUT" ] ; then  CATALINA_OUT="$CATALINA_BASE"/logs/catalina.outfiif [ -z "$CATALINA_TMPDIR" ] ; then  # Define the java.io.tmpdir to use for Catalina  CATALINA_TMPDIR="$CATALINA_BASE"/tempfi# Add tomcat-juli.jar to classpath# tomcat-juli.jar can be over-ridden per instanceif [ -r "$CATALINA_BASE/bin/tomcat-juli.jar" ] ; then  CLASSPATH=$CLASSPATH:$CATALINA_BASE/bin/tomcat-juli.jarelse  CLASSPATH=$CLASSPATH:$CATALINA_HOME/bin/tomcat-juli.jarfi# Bugzilla 37848: When no TTY is available, don't output to consolehave_tty=0if [ "`tty`" != "not a tty" ]; then    have_tty=1fi# For Cygwin, switch paths to Windows format before running javaif $cygwin; then  JAVA_HOME=`cygpath --absolute --windows "$JAVA_HOME"`  JRE_HOME=`cygpath --absolute --windows "$JRE_HOME"`  CATALINA_HOME=`cygpath --absolute --windows "$CATALINA_HOME"`  CATALINA_BASE=`cygpath --absolute --windows "$CATALINA_BASE"`  CATALINA_TMPDIR=`cygpath --absolute --windows "$CATALINA_TMPDIR"`  CLASSPATH=`cygpath --path --windows "$CLASSPATH"`  JAVA_ENDORSED_DIRS=`cygpath --path --windows "$JAVA_ENDORSED_DIRS"`fi# Set juli LogManager config file if it is present and an override has not been issuedif [ -z "$LOGGING_CONFIG" ]; then  if [ -r "$CATALINA_BASE"/conf/logging.properties ]; then    LOGGING_CONFIG="-Djava.util.logging.config.file=$CATALINA_BASE/conf/logging.properties"  else    # Bugzilla 45585    LOGGING_CONFIG="-Dnop"  fifiif [ -z "$LOGGING_MANAGER" ]; then  LOGGING_MANAGER="-Djava.util.logging.manager=org.apache.juli.ClassLoaderLogManager"fi# Uncomment the following line to make the umask available when using the# org.apache.catalina.security.SecurityListener#JAVA_OPTS="$JAVA_OPTS -Dorg.apache.catalina.security.SecurityListener.UMASK=`umask`"# ----- Execute The Requested Command -----------------------------------------# Bugzilla 37848: only output this if we have a TTYif [ $have_tty -eq 1 ]; then  echo "Using CATALINA_BASE:   $CATALINA_BASE"  echo "Using CATALINA_HOME:   $CATALINA_HOME"  echo "Using CATALINA_TMPDIR: $CATALINA_TMPDIR"  if [ "$1" = "debug" ] ; then    echo "Using JAVA_HOME:       $JAVA_HOME"  else    echo "Using JRE_HOME:        $JRE_HOME"  fi  echo "Using CLASSPATH:       $CLASSPATH"  if [ ! -z "$CATALINA_PID" ]; then    echo "Using CATALINA_PID:    $CATALINA_PID"  fifiif [ "$1" = "jpda" ] ; then  if [ -z "$JPDA_TRANSPORT" ]; then    JPDA_TRANSPORT="dt_socket"  fi  if [ -z "$JPDA_ADDRESS" ]; then    JPDA_ADDRESS="localhost:8000"  fi  if [ -z "$JPDA_SUSPEND" ]; then    JPDA_SUSPEND="n"  fi  if [ -z "$JPDA_OPTS" ]; then    JPDA_OPTS="-agentlib:jdwp=transport=$JPDA_TRANSPORT,address=$JPDA_ADDRESS,server=y,suspend=$JPDA_SUSPEND"  fi  CATALINA_OPTS="$JPDA_OPTS $CATALINA_OPTS"  shiftfiif [ "$1" = "debug" ] ; then  if $os400; then    echo "Debug command not available on OS400"    exit 1  else    shift    if [ "$1" = "-security" ] ; then      if [ $have_tty -eq 1 ]; then        echo "Using Security Manager"      fi      shift      exec "$_RUNJDB" "$LOGGING_CONFIG" $LOGGING_MANAGER $JAVA_OPTS $CATALINA_OPTS \        -Djava.endorsed.dirs="$JAVA_ENDORSED_DIRS" -classpath "$CLASSPATH" \        -sourcepath "$CATALINA_HOME"/../../java \        -Djava.security.manager \        -Djava.security.policy=="$CATALINA_BASE"/conf/catalina.policy \        -Dcatalina.base="$CATALINA_BASE" \        -Dcatalina.home="$CATALINA_HOME" \        -Djava.io.tmpdir="$CATALINA_TMPDIR" \        org.apache.catalina.startup.Bootstrap "$@" start    else      exec "$_RUNJDB" "$LOGGING_CONFIG" $LOGGING_MANAGER $JAVA_OPTS $CATALINA_OPTS \        -Djava.endorsed.dirs="$JAVA_ENDORSED_DIRS" -classpath "$CLASSPATH" \        -sourcepath "$CATALINA_HOME"/../../java \        -Dcatalina.base="$CATALINA_BASE" \        -Dcatalina.home="$CATALINA_HOME" \        -Djava.io.tmpdir="$CATALINA_TMPDIR" \        org.apache.catalina.startup.Bootstrap "$@" start    fi  fielif [ "$1" = "run" ]; then  shift  if [ "$1" = "-security" ] ; then    if [ $have_tty -eq 1 ]; then      echo "Using Security Manager"    fi    shift    eval exec "\"$_RUNJAVA\"" "\"$LOGGING_CONFIG\"" $LOGGING_MANAGER $JAVA_OPTS $CATALINA_OPTS \      -Djava.endorsed.dirs="\"$JAVA_ENDORSED_DIRS\"" -classpath "\"$CLASSPATH\"" \      -Djava.security.manager \      -Djava.security.policy=="\"$CATALINA_BASE/conf/catalina.policy\"" \      -Dcatalina.base="\"$CATALINA_BASE\"" \      -Dcatalina.home="\"$CATALINA_HOME\"" \      -Djava.io.tmpdir="\"$CATALINA_TMPDIR\"" \      org.apache.catalina.startup.Bootstrap "$@" start  else    eval exec "\"$_RUNJAVA\"" "\"$LOGGING_CONFIG\"" $LOGGING_MANAGER $JAVA_OPTS $CATALINA_OPTS \      -Djava.endorsed.dirs="\"$JAVA_ENDORSED_DIRS\"" -classpath "\"$CLASSPATH\"" \      -Dcatalina.base="\"$CATALINA_BASE\"" \      -Dcatalina.home="\"$CATALINA_HOME\"" \      -Djava.io.tmpdir="\"$CATALINA_TMPDIR\"" \      org.apache.catalina.startup.Bootstrap "$@" start  fielif [ "$1" = "start" ] ; then  if [ ! -z "$CATALINA_PID" ]; then    if [ -f "$CATALINA_PID" ]; then      if [ -s "$CATALINA_PID" ]; then        echo "Existing PID file found during start."        if [ -r "$CATALINA_PID" ]; then          PID=`cat "$CATALINA_PID"`          ps -p $PID >/dev/null 2>&1          if [ $? -eq 0 ] ; then            echo "Tomcat appears to still be running with PID $PID. Start aborted."            echo "If the following process is not a Tomcat process, remove the PID file and try again:"            ps -f -p $PID            exit 1          else            echo "Removing/clearing stale PID file."            rm -f "$CATALINA_PID" >/dev/null 2>&1            if [ $? != 0 ]; then              if [ -w "$CATALINA_PID" ]; then                cat /dev/null > "$CATALINA_PID"              else                echo "Unable to remove or clear stale PID file. Start aborted."                exit 1              fi            fi          fi        else          echo "Unable to read PID file. Start aborted."          exit 1        fi      else        rm -f "$CATALINA_PID" >/dev/null 2>&1        if [ $? != 0 ]; then          if [ ! -w "$CATALINA_PID" ]; then            echo "Unable to remove or write to empty PID file. Start aborted."            exit 1          fi        fi      fi    fi  fi  shift  touch "$CATALINA_OUT"  if [ "$1" = "-security" ] ; then    if [ $have_tty -eq 1 ]; then      echo "Using Security Manager"    fi    shift    eval "\"$_RUNJAVA\"" "\"$LOGGING_CONFIG\"" $LOGGING_MANAGER $JAVA_OPTS $CATALINA_OPTS \      -Djava.endorsed.dirs="\"$JAVA_ENDORSED_DIRS\"" -classpath "\"$CLASSPATH\"" \      -Djava.security.manager \      -Djava.security.policy=="\"$CATALINA_BASE/conf/catalina.policy\"" \      -Dcatalina.base="\"$CATALINA_BASE\"" \      -Dcatalina.home="\"$CATALINA_HOME\"" \      -Djava.io.tmpdir="\"$CATALINA_TMPDIR\"" \      org.apache.catalina.startup.Bootstrap "$@" start \      >> "$CATALINA_OUT" 2>&1 "&"  else    eval "\"$_RUNJAVA\"" "\"$LOGGING_CONFIG\"" $LOGGING_MANAGER $JAVA_OPTS $CATALINA_OPTS \      -Djava.endorsed.dirs="\"$JAVA_ENDORSED_DIRS\"" -classpath "\"$CLASSPATH\"" \      -Dcatalina.base="\"$CATALINA_BASE\"" \      -Dcatalina.home="\"$CATALINA_HOME\"" \      -Djava.io.tmpdir="\"$CATALINA_TMPDIR\"" \      org.apache.catalina.startup.Bootstrap "$@" start \      >> "$CATALINA_OUT" 2>&1 "&"  fi  if [ ! -z "$CATALINA_PID" ]; then    echo $! > "$CATALINA_PID"  fi  echo "Tomcat started."elif [ "$1" = "stop" ] ; then  shift  SLEEP=5  if [ ! -z "$1" ]; then    echo $1 | grep "[^0-9]" >/dev/null 2>&1    if [ $? -gt 0 ]; then      SLEEP=$1      shift    fi  fi  FORCE=0  if [ "$1" = "-force" ]; then    shift    FORCE=1  fi  if [ ! -z "$CATALINA_PID" ]; then    if [ -f "$CATALINA_PID" ]; then      if [ -s "$CATALINA_PID" ]; then        kill -0 `cat "$CATALINA_PID"` >/dev/null 2>&1        if [ $? -gt 0 ]; then          echo "PID file found but no matching process was found. Stop aborted."          exit 1        fi      else        echo "PID file is empty and has been ignored."      fi    else      echo "\$CATALINA_PID was set but the specified file does not exist. Is Tomcat running? Stop aborted."      exit 1    fi  fi  eval "\"$_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 "$CATALINA_PID"` >/dev/null 2>&1    fi  fi  if [ ! -z "$CATALINA_PID" ]; then    if [ -f "$CATALINA_PID" ]; then      while [ $SLEEP -ge 0 ]; do        kill -0 `cat "$CATALINA_PID"` >/dev/null 2>&1        if [ $? -gt 0 ]; then          rm -f "$CATALINA_PID" >/dev/null 2>&1          if [ $? != 0 ]; then            if [ -w "$CATALINA_PID" ]; then              cat /dev/null > "$CATALINA_PID"              # If Tomcat has stopped don't try and force a stop with an empty PID file              FORCE=0            else              echo "The PID file could not be removed or cleared."            fi          fi          echo "Tomcat stopped."          break        fi        if [ $SLEEP -gt 0 ]; then          sleep 1        fi        if [ $SLEEP -eq 0 ]; then          echo "Tomcat did not stop in time."          if [ $FORCE -eq 0 ]; then            echo "PID file was not removed."          fi          echo "To aid diagnostics a thread dump has been written to standard out."          kill -3 `cat "$CATALINA_PID"`        fi        SLEEP=`expr $SLEEP - 1 `      done    fi  fi  KILL_SLEEP_INTERVAL=5  if [ $FORCE -eq 1 ]; then    if [ -z "$CATALINA_PID" ]; then      echo "Kill failed: \$CATALINA_PID not set"    else      if [ -f "$CATALINA_PID" ]; then        PID=`cat "$CATALINA_PID"`        echo "Killing Tomcat with the PID: $PID"        kill -9 $PID        while [ $KILL_SLEEP_INTERVAL -ge 0 ]; do            kill -0 `cat "$CATALINA_PID"` >/dev/null 2>&1            if [ $? -gt 0 ]; then                rm -f "$CATALINA_PID" >/dev/null 2>&1                if [ $? != 0 ]; then                    if [ -w "$CATALINA_PID" ]; then                        cat /dev/null > "$CATALINA_PID"                    else                        echo "The PID file could not be removed."                    fi                fi                echo "The Tomcat process has been killed."                break            fi            if [ $KILL_SLEEP_INTERVAL -gt 0 ]; then                sleep 1            fi            KILL_SLEEP_INTERVAL=`expr $KILL_SLEEP_INTERVAL - 1 `        done        if [ $KILL_SLEEP_INTERVAL -lt 0 ]; then            echo "Tomcat has not been killed completely yet. The process might be waiting on some system call or might be UNINTERRUPTIBLE."        fi      fi    fi  fielif [ "$1" = "configtest" ] ; then    eval "\"$_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 configtest    result=$?    if [ $result -ne 0 ]; then        echo "Configuration error detected!"    fi    exit $resultelif [ "$1" = "version" ] ; then    "$_RUNJAVA"   \      -classpath "$CATALINA_HOME/lib/catalina.jar" \      org.apache.catalina.util.ServerInfoelse  echo "Usage: catalina.sh ( commands ... )"  echo "commands:"  if $os400; then    echo "  debug             Start Catalina in a debugger (not available on OS400)"    echo "  debug -security   Debug Catalina with a security manager (not available on OS400)"  else    echo "  debug             Start Catalina in a debugger"    echo "  debug -security   Debug Catalina with a security manager"  fi  echo "  jpda start        Start Catalina under JPDA debugger"  echo "  run               Start Catalina in the current window"  echo "  run -security     Start in the current window with security manager"  echo "  start             Start Catalina in a separate window"  echo "  start -security   Start in a separate window with security manager"  echo "  stop              Stop Catalina, waiting up to 5 seconds for the process to end"  echo "  stop n            Stop Catalina, waiting up to n seconds for the process to end"  echo "  stop -force       Stop Catalina, wait up to 5 seconds and then use kill -KILL if still running"  echo "  stop n -force     Stop Catalina, wait up to n seconds and then use kill -KILL if still running"  echo "  configtest        Run a basic syntax check on server.xml - check exit code for result"  echo "  version           What version of tomcat are you running?"  echo "Note: Waiting for the process to end and use of the -force option require that \$CATALINA_PID is defined"  exit 1fi