当我不断向我的网络服务器发送 http 请求时，它停止响应并且我卡在一个白屏中，说“等待 xxx”。它没有反应。
我也没有在堆栈跟踪上看到任何异常。我在 catalina.out 中没有看到任何异常。
我认为这与tomcat没有关闭套接字连接有关。这只发生在
$ cd /proc/{processID}/fd
$ ls -l | wc -l
返回值超过 1000。几乎每次我点击刷新 'ls -l | 的返回值 wc -l' 上升！
如果我发出这个命令
$ ll
我看到很多记录，比如
lrwx------ 1 root root 64 5월 22 17:49 989 -> socket:[1018368]
lr-x------ 1 root root 64 5월 22 17:41 99 -> socket:[1017430]
lrwx------ 1 root root 64 5월 22 17:49 990 -> socket:[1018369]
lrwx------ 1 root root 64 5월 22 17:49 991 -> socket:[1018370]
lrwx------ 1 root root 64 5월 22 17:49 992 -> socket:[1018371]
lrwx------ 1 root root 64 5월 22 17:49 993 -> socket:[1018384]
lrwx------ 1 root root 64 5월 22 17:49 994 -> socket:[1018373]
lrwx------ 1 root root 64 5월 22 17:49 995 -> socket:[1018374]
lrwx------ 1 root root 64 5월 22 17:49 996 -> socket:[1018375]
lrwx------ 1 root root 64 5월 22 17:49 997 -> socket:[1018377]
lrwx------ 1 root root 64 5월 22 17:49 998 -> socket:[1018378]
lrwx------ 1 root root 64 5월 22 17:49 999 -> socket:[1018379]
我很确定这不是关于我的 Web 应用程序没有返回（或没有关闭）它与数据库的连接。
我正在使用 MySQL 并且我已经配置了 my.cfg
[mysqld]
wait-timeout=3
interactive-timeout=60
我可以在mysql中查看
mysql> select @@session.wait_timeout, @@global.wait_timeout;
+------------------------+-----------------------+
| @@session.wait_timeout | @@global.wait_timeout |
+------------------------+-----------------------+
| 30 | 3 |
+------------------------+-----------------------+
1 row in set (0.00 sec)
另外，如果我发出
这不是 DNS 问题。我可以在我的网络服务器上打开网站就好了。
netstat -tulpn
tcp 0 0 ::ffff:127.0.0.1:8005 :::* LISTEN 21395/java
tcp 0 0 :::8009 :::* LISTEN 21395/java
tcp 0 0 :::80 :::* LISTEN 21395/java
还
lsof -p 21395
显示很多
java 21395 root 359u sock 0,5 0t0 1379694 can't identify protocol
java 21395 root 360u sock 0,5 0t0 1379696 can't identify protocol
java 21395 root 361u sock 0,5 0t0 1379697 can't identify protocol
java 21395 root 362u sock 0,5 0t0 1379700 can't identify protocol
java 21395 root 363u sock 0,5 0t0 1379702 can't identify protocol
java 21395 root 364u sock 0,5 0t0 1379703 can't identify protocol
java 21395 root 365u sock 0,5 0t0 1379961 can't identify protocol
我可以在哪里看到 Tomcat 与 MySQL 的连接
java 21395 root 390u IPv6 1380717 0t0 TCP cooingbee.co.kr:40026->cooingbee.co.kr:mysql (CLOSE_WAIT)
java 21395 root 391u IPv6 1380718 0t0 TCP cooingbee.co.kr:40025->cooingbee.co.kr:mysql (CLOSE_WAIT)
java 21395 root 392u IPv6 1380721 0t0 TCP cooingbee.co.kr:40028->cooingbee.co.kr:mysql (CLOSE_WAIT)
我也设置了 ulimit
]# ulimit -n
4096
]#ulimit -Hn
65536
在我的 sysctl.conf 中，我添加了这些但仍然没有运气。
kernel.shmmni = 4096
kernel.sem = 256 32000 100 128
fs.aio-max-nr = 1048576
fs.file-max = 6815744
net.core.rmem_default = 262144
net.core.rmem_max = 4194304
net.core.wmem_default = 262144
net.core.wmem_max = 1048586
关于我的服务器环境的附加信息
CentOS 5.x
Java 7
Tomcat6 / 7 (I've tested my webapp on both tomcat 6 and 7)
MySQL 5.5
web application uses Hibernate, c3p0, Spring DI, MVC
我已经从 DBMS 方面确认连接没有通过使用泄漏
show processlist
问题
那些“袜子无法识别协议”是什么？
如果我在 /proc/{processID}/fd 中有超过一千条记录，为什么我的 tomcat 没有响应？
我应该怎么做才能使其顺利运行？
编辑 1
我会告诉你代码。仅供参考，我既没有设计也没有打算以这种方式使用 Hibernate 和 Spring。我想你会明白我为什么现在这么说的；）。
部分 pf 我的 hibernate.cfg.xml
<property name="connection.driver_class">com.mysql.jdbc.Driver</property>
<property name="connection.url">jdbc:mysql://***.***.***.***:3306/****</property>
<property name="connection.username">****</property>
<property name="connection.password">****</property>
<property name="hibernate.c3p0.acquire_increment">5</property>
<property name="hibernate.c3p0.idle_test_period">100</property>
<property name="hibernate.c3p0.max_size">10000</property>
<property name="hibernate.c3p0.max_statements">0</property>
<property name="hibernate.c3p0.min_size">5</property>
<property name="hibernate.c3p0.testConnectionOnCheckout">true</property>
<property name="hibernate.c3p0.unreturnedConnectionTimeout">70</property>
<property name="hibernate.c3p0.timeout">1</property>
<property name="current_session_context_class">thread</property>
<property name="cache.provider_class">org.hibernate.cache.NoCacheProvider</property>
我的 spring-servlet.xml 的一部分
<bean id="sessionFactory" class="org.springframework.orm.hibernate3.LocalSessionFactoryBean">
<!--
<property name="dataSource"><ref bean="dataSource"/></property>
-->
<property name="configLocation">
<value>classpath:hibernate.cfg.xml</value>
</property>
最后，一些Java代码
public class ItemDAOImpl extends HibernateDaoSupport implements ItemDAO {
public ItemDetail itemDetail(Integer itemSeq) {
ItemDetail itemDetail = null;
try {
itemDetail = (ItemDetail) this.getHibernateTemplate().get("kr.co.sgis.services.web.mobile.item.form.ItemDetail", itemSeq);
System.out.println("Item Detail~ :: " + itemDetail.getId());
return itemDetail;
} catch (Exception ex) {
System.err.println(ex.getMessage() + "\nThe Stack Trace is:");
ex.printStackTrace();
return itemDetail;
}
}
public Item itemView(Integer itemSeq, Integer mo_id) {
Item itemView = null;
Session session = null;
try {
session = getSession();
Criteria item = session.createCriteria(Item.class)
.add(Restrictions.eq("id", itemSeq))
.add(Restrictions.eq("mobile_id", mo_id));
itemView = (Item) item.uniqueResult();
//itemView = (ItemHead) this.getHibernateTemplate().get("kr.co.sgis.services.web.mobile.item.form.Item", itemSeq);
System.out.println("Item View~ :: " + itemView.getId());
session.flush();
return itemView;
} catch (Exception ex) {
System.err.println(ex.getMessage() + "\nThe Stack Trace is:");
ex.printStackTrace();
return itemView;
}finally{
HibernateUtil.tryCloseAll(session, null);
}
}
...
}
据我在互联网上搜索，不推荐使用 getHibernateTemplate() 和 HibernateDAOSupport。此外，如果我使用 getHibernateTemplate()，我不必手动显式关闭会话，但我很绝望，所以我添加了“HibernateUtil.tryCloseAll()”。
这里
public static void tryCloseAll(Session s, Transaction t){
try{
if(t!=null){
if(t.isActive()){
//?
t.commit();
}
}
if(s!=null){
if(s.isOpen()){
try{
s.flush();
}catch(Exception e){
System.out.println("Tried to close session and failed");
}
}
}
}catch(Exception e){
}
}
编辑 2
以下是 kill -QUIT PID 的输出
2013-05-23 17:26:10
Full thread dump Java HotSpot(TM) 64-Bit Server VM (23.21-b01 mixed mode):
"http-80-6" daemon prio=10 tid=0x0000000002ad3800 nid=0x357f in Object.wait() [0x00002b75db57d000]
java.lang.Thread.State: WAITING (on object monitor)
at java.lang.Object.wait(Native Method)
- waiting on <0x00000000fab5c158> (a org.apache.tomcat.util.net.JIoEndpoint$Worker)
at java.lang.Object.wait(Object.java:503)
at org.apache.tomcat.util.net.JIoEndpoint$Worker.await(JIoEndpoint.java:458)
- locked <0x00000000fab5c158> (a org.apache.tomcat.util.net.JIoEndpoint$Worker)
at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:484)
at java.lang.Thread.run(Thread.java:722)
"http-80-5" daemon prio=10 tid=0x0000000002505800 nid=0x3577 in Object.wait() [0x00002b75db47c000]
java.lang.Thread.State: WAITING (on object monitor)
at java.lang.Object.wait(Native Method)
- waiting on <0x00000000fab1a4a0> (a org.apache.tomcat.util.net.JIoEndpoint$Worker)
at java.lang.Object.wait(Object.java:503)
at org.apache.tomcat.util.net.JIoEndpoint$Worker.await(JIoEndpoint.java:458)
- locked <0x00000000fab1a4a0> (a org.apache.tomcat.util.net.JIoEndpoint$Worker)
at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:484)
at java.lang.Thread.run(Thread.java:722)
"http-80-4" daemon prio=10 tid=0x0000000002f6a800 nid=0x3576 in Object.wait() [0x00002b75db37b000]
java.lang.Thread.State: WAITING (on object monitor)
at java.lang.Object.wait(Native Method)
- waiting on <0x00000000fab60f68> (a org.apache.tomcat.util.net.JIoEndpoint$Worker)
at java.lang.Object.wait(Object.java:503)
at org.apache.tomcat.util.net.JIoEndpoint$Worker.await(JIoEndpoint.java:458)
- locked <0x00000000fab60f68> (a org.apache.tomcat.util.net.JIoEndpoint$Worker)
at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:484)
at java.lang.Thread.run(Thread.java:722)
"http-80-3" daemon prio=10 tid=0x00000000036fd800 nid=0x3575 in Object.wait() [0x00002b75db27a000]
java.lang.Thread.State: WAITING (on object monitor)
at java.lang.Object.wait(Native Method)
- waiting on <0x00000000fab61d68> (a org.apache.tomcat.util.net.JIoEndpoint$Worker)
at java.lang.Object.wait(Object.java:503)
at org.apache.tomcat.util.net.JIoEndpoint$Worker.await(JIoEndpoint.java:458)
- locked <0x00000000fab61d68> (a org.apache.tomcat.util.net.JIoEndpoint$Worker)
at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:484)
at java.lang.Thread.run(Thread.java:722)
"http-80-2" daemon prio=10 tid=0x0000000002ac2000 nid=0x3574 in Object.wait() [0x00002b75db179000]
java.lang.Thread.State: WAITING (on object monitor)
at java.lang.Object.wait(Native Method)
- waiting on <0x00000000fab1f2f0> (a org.apache.tomcat.util.net.JIoEndpoint$Worker)
at java.lang.Object.wait(Object.java:503)
at org.apache.tomcat.util.net.JIoEndpoint$Worker.await(JIoEndpoint.java:458)
- locked <0x00000000fab1f2f0> (a org.apache.tomcat.util.net.JIoEndpoint$Worker)
at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:484)
at java.lang.Thread.run(Thread.java:722)
"http-80-1" daemon prio=10 tid=0x00000000028eb800 nid=0x3571 in Object.wait() [0x00002b75dae6e000]
java.lang.Thread.State: WAITING (on object monitor)
at java.lang.Object.wait(Native Method)
- waiting on <0x00000000fab62188> (a org.apache.tomcat.util.net.JIoEndpoint$Worker)
at java.lang.Object.wait(Object.java:503)
at org.apache.tomcat.util.net.JIoEndpoint$Worker.await(JIoEndpoint.java:458)
- locked <0x00000000fab62188> (a org.apache.tomcat.util.net.JIoEndpoint$Worker)
at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:484)
at java.lang.Thread.run(Thread.java:722)
"TP-Monitor" daemon prio=10 tid=0x000000000260d800 nid=0x356f in Object.wait() [0x00002b75dad6d000]
java.lang.Thread.State: TIMED_WAITING (on object monitor)
at java.lang.Object.wait(Native Method)
- waiting on <0x00000000fab19420> (a org.apache.tomcat.util.threads.ThreadPool$MonitorRunnable)
at org.apache.tomcat.util.threads.ThreadPool$MonitorRunnable.run(ThreadPool.java:565)
- locked <0x00000000fab19420> (a org.apache.tomcat.util.threads.ThreadPool$MonitorRunnable)
at java.lang.Thread.run(Thread.java:722)
"TP-Processor4" daemon prio=10 tid=0x0000000002add000 nid=0x356e runnable [0x00002b75dac6c000]
java.lang.Thread.State: RUNNABLE
at java.net.PlainSocketImpl.socketAccept(Native Method)
at java.net.AbstractPlainSocketImpl.accept(AbstractPlainSocketImpl.java:398)
at java.net.ServerSocket.implAccept(ServerSocket.java:522)
at java.net.ServerSocket.accept(ServerSocket.java:490)
at org.apache.jk.common.ChannelSocket.accept(ChannelSocket.java:311)
at org.apache.jk.common.ChannelSocket.acceptConnections(ChannelSocket.java:668)
at org.apache.jk.common.ChannelSocket$SocketAcceptor.runIt(ChannelSocket.java:879)
at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:690)
at java.lang.Thread.run(Thread.java:722)
"TP-Processor3" daemon prio=10 tid=0x0000000002adb800 nid=0x356d in Object.wait() [0x00002b75dab6b000]
java.lang.Thread.State: WAITING (on object monitor)
at java.lang.Object.wait(Native Method)
- waiting on <0x00000000fab18d30> (a org.apache.tomcat.util.threads.ThreadPool$ControlRunnable)
at java.lang.Object.wait(Object.java:503)
at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:662)
- locked <0x00000000fab18d30> (a org.apache.tomcat.util.threads.ThreadPool$ControlRunnable)
at java.lang.Thread.run(Thread.java:722)
"TP-Processor2" daemon prio=10 tid=0x00000000025d9000 nid=0x356c in Object.wait() [0x00002b75daa6a000]
java.lang.Thread.State: WAITING (on object monitor)
at java.lang.Object.wait(Native Method)
- waiting on <0x00000000fab18f80> (a org.apache.tomcat.util.threads.ThreadPool$ControlRunnable)
at java.lang.Object.wait(Object.java:503)
at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:662)
- locked <0x00000000fab18f80> (a org.apache.tomcat.util.threads.ThreadPool$ControlRunnable)
at java.lang.Thread.run(Thread.java:722)
"TP-Processor1" daemon prio=10 tid=0x00000000025d8800 nid=0x356b in Object.wait() [0x00002b75da969000]
java.lang.Thread.State: WAITING (on object monitor)
at java.lang.Object.wait(Native Method)
- waiting on <0x00000000fab191d0> (a org.apache.tomcat.util.threads.ThreadPool$ControlRunnable)
at java.lang.Object.wait(Object.java:503)
at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:662)
- locked <0x00000000fab191d0> (a org.apache.tomcat.util.threads.ThreadPool$ControlRunnable)
at java.lang.Thread.run(Thread.java:722)
"http-80-Acceptor-0" daemon prio=10 tid=0x00002b75dc769000 nid=0x356a runnable [0x00002b75da622000]
java.lang.Thread.State: RUNNABLE
at java.net.PlainSocketImpl.socketAccept(Native Method)
at java.net.AbstractPlainSocketImpl.accept(AbstractPlainSocketImpl.java:398)
at java.net.ServerSocket.implAccept(ServerSocket.java:522)
at java.net.ServerSocket.accept(ServerSocket.java:490)
at org.apache.tomcat.util.net.DefaultServerSocketFactory.acceptSocket(DefaultServerSocketFactory.java:61)
at org.apache.tomcat.util.net.JIoEndpoint$Acceptor.run(JIoEndpoint.java:352)
at java.lang.Thread.run(Thread.java:722)
"ContainerBackgroundProcessor[StandardEngine[Catalina]]" daemon prio=10 tid=0x000000000424d000 nid=0x3569 waiting on condition [0x00002b75da521000]
java.lang.Thread.State: TIMED_WAITING (sleeping)
at java.lang.Thread.sleep(Native Method)
at org.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor.run(ContainerBase.java:1631)
at java.lang.Thread.run(Thread.java:722)
"Timer-1" daemon prio=10 tid=0x000000000267b000 nid=0x3564 in Object.wait() [0x00002b75da82c000]
java.lang.Thread.State: TIMED_WAITING (on object monitor)
at java.lang.Object.wait(Native Method)
- waiting on <0x00000000c3046fb8> (a java.util.TaskQueue)
at java.util.TimerThread.mainLoop(Timer.java:552)
- locked <0x00000000c3046fb8> (a java.util.TaskQueue)
at java.util.TimerThread.run(Timer.java:505)
"Timer-0" prio=10 tid=0x00000000026c0800 nid=0x3563 in Object.wait() [0x00002b75da72b000]
java.lang.Thread.State: TIMED_WAITING (on object monitor)
at java.lang.Object.wait(Native Method)
- waiting on <0x00000000c30906a0> (a java.util.TaskQueue)
at java.util.TimerThread.mainLoop(Timer.java:552)
- locked <0x00000000c30906a0> (a java.util.TaskQueue)
at java.util.TimerThread.run(Timer.java:505)
"GC Daemon" daemon prio=10 tid=0x00002b75dc44d800 nid=0x3562 in Object.wait() [0x00002b75d9d98000]
java.lang.Thread.State: TIMED_WAITING (on object monitor)
at java.lang.Object.wait(Native Method)
- waiting on <0x00000000c29e3d38> (a sun.misc.GC$LatencyLock)
at sun.misc.GC$Daemon.run(GC.java:117)
- locked <0x00000000c29e3d38> (a sun.misc.GC$LatencyLock)
"Service Thread" daemon prio=10 tid=0x0000000002382000 nid=0x3560 runnable [0x0000000000000000]
java.lang.Thread.State: RUNNABLE
"C2 CompilerThread1" daemon prio=10 tid=0x0000000002377000 nid=0x355f waiting on condition [0x0000000000000000]
java.lang.Thread.State: RUNNABLE
"C2 CompilerThread0" daemon prio=10 tid=0x0000000002374000 nid=0x355e waiting on condition [0x0000000000000000]
java.lang.Thread.State: RUNNABLE
"Signal Dispatcher" daemon prio=10 tid=0x0000000002371800 nid=0x355d waiting on condition [0x0000000000000000]
java.lang.Thread.State: RUNNABLE
"Finalizer" daemon prio=10 tid=0x0000000002324800 nid=0x355c in Object.wait() [0x00002b75d5832000]
java.lang.Thread.State: WAITING (on object monitor)
at java.lang.Object.wait(Native Method)
- waiting on <0x00000000c287dbd8> (a java.lang.ref.ReferenceQueue$Lock)
at java.lang.ref.ReferenceQueue.remove(ReferenceQueue.java:135)
- locked <0x00000000c287dbd8> (a java.lang.ref.ReferenceQueue$Lock)
at java.lang.ref.ReferenceQueue.remove(ReferenceQueue.java:151)
at java.lang.ref.Finalizer$FinalizerThread.run(Finalizer.java:189)
"Reference Handler" daemon prio=10 tid=0x000000000231d000 nid=0x355b in Object.wait() [0x00002b75d5731000]
java.lang.Thread.State: WAITING (on object monitor)
at java.lang.Object.wait(Native Method)
- waiting on <0x00000000c287d7f8> (a java.lang.ref.Reference$Lock)
at java.lang.Object.wait(Object.java:503)
at java.lang.ref.Reference$ReferenceHandler.run(Reference.java:133)
- locked <0x00000000c287d7f8> (a java.lang.ref.Reference$Lock)
"main" prio=10 tid=0x0000000002284000 nid=0x3551 runnable [0x00002b75cc81a000]
java.lang.Thread.State: RUNNABLE
at java.net.PlainSocketImpl.socketAccept(Native Method)
at java.net.AbstractPlainSocketImpl.accept(AbstractPlainSocketImpl.java:398)
at java.net.ServerSocket.implAccept(ServerSocket.java:522)
at java.net.ServerSocket.accept(ServerSocket.java:490)
at org.apache.catalina.core.StandardServer.await(StandardServer.java:431)
at org.apache.catalina.startup.Catalina.await(Catalina.java:676)
at org.apache.catalina.startup.Catalina.start(Catalina.java:628)
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:601)
at org.apache.catalina.startup.Bootstrap.start(Bootstrap.java:289)
at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:414)
"VM Thread" prio=10 tid=0x0000000002315800 nid=0x355a runnable
"GC task thread#0 (ParallelGC)" prio=10 tid=0x0000000002291800 nid=0x3552 runnable
"GC task thread#1 (ParallelGC)" prio=10 tid=0x0000000002293800 nid=0x3553 runnable
"GC task thread#2 (ParallelGC)" prio=10 tid=0x0000000002295000 nid=0x3554 runnable
"GC task thread#3 (ParallelGC)" prio=10 tid=0x0000000002297000 nid=0x3555 runnable
"GC task thread#4 (ParallelGC)" prio=10 tid=0x0000000002299000 nid=0x3556 runnable
"GC task thread#5 (ParallelGC)" prio=10 tid=0x000000000229a800 nid=0x3557 runnable
"GC task thread#6 (ParallelGC)" prio=10 tid=0x000000000229c800 nid=0x3558 runnable
"GC task thread#7 (ParallelGC)" prio=10 tid=0x000000000229e800 nid=0x3559 runnable
"VM Periodic Task Thread" prio=10 tid=0x000000000238c800 nid=0x3561 waiting on condition
JNI global references: 232
Heap
PSYoungGen total 197248K, used 65894K [0x00000000eb760000, 0x00000000fbb30000, 0x0000000100000000)
eden space 180608K, 27% used [0x00000000eb760000,0x00000000ee781540,0x00000000f67c0000)
from space 16640K, 99% used [0x00000000faaf0000,0x00000000fbb28510,0x00000000fbb30000)
to space 26368K, 0% used [0x00000000f87b0000,0x00000000f87b0000,0x00000000fa170000)
ParOldGen total 76864K, used 45414K [0x00000000c2600000, 0x00000000c7110000, 0x00000000eb760000)
object space 76864K, 59% used [0x00000000c2600000,0x00000000c5259a10,0x00000000c7110000)
PSPermGen total 67200K, used 44249K [0x00000000bd400000, 0x00000000c15a0000, 0x00000000c2600000)
object space 67200K, 65% used [0x00000000bd400000,0x00000000bff36788,0x00000000c15a0000)