RMI连接问题 - ITeye问答

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RMI连接问题10

先贴下异常信息：
Lookup of RMI stub failed; nested exception is java.rmi.ConnectIOException: error during JRMP connection establishment; nested exception is:
        java.net.SocketException: Connection reset
org.springframework.remoting.RemoteLookupFailureException: Lookup of RMI stub failed; nested exception is java.rmi.ConnectIOException: error during JRMP connection establishment; nested exception is:
        java.net.SocketException: Connection reset
        at org.springframework.remoting.rmi.RmiClientInterceptor.lookupStub(RmiClientInterceptor.java:215)
        at org.springframework.remoting.rmi.RmiClientInterceptor.getStub(RmiClientInterceptor.java:237)
        at org.springframework.remoting.rmi.RmiClientInterceptor.invoke(RmiClientInterceptor.java:257)
        at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:172)
        at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:202)
        at $Proxy2.handleEvent(Unknown Source)
        at com.ffcs.oss.snms.fm.services.dataservice.EventSenderImpl.handleEvent(EventSenderImpl.java:219)
        at com.ffcs.oss.snms.fm.services.dataservice.EventSenderImpl.sendEventTask(EventSenderImpl.java:191)
        at com.ffcs.oss.snms.fm.services.dataservice.EventSenderImpl.access$0(EventSenderImpl.java:173)
        at com.ffcs.oss.snms.fm.services.dataservice.EventSenderImpl$ResSendTask.run(EventSenderImpl.java:166)
        at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:441)
        at java.util.concurrent.FutureTask$Sync.innerRunAndReset(FutureTask.java:317)
        at java.util.concurrent.FutureTask.runAndReset(FutureTask.java:150)
        at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$101(ScheduledThreadPoolExecutor.java:98)
        at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.runPeriodic(ScheduledThreadPoolExecutor.java:180)
        at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:204)
        at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
        at java.lang.Thread.run(Thread.java:662)
Caused by: java.rmi.ConnectIOException: error during JRMP connection establishment; nested exception is:
        java.net.SocketException: Connection reset
        at sun.rmi.transport.tcp.TCPChannel.createConnection(TCPChannel.java:286)
        at sun.rmi.transport.tcp.TCPChannel.newConnection(TCPChannel.java:184)
        at sun.rmi.server.UnicastRef.newCall(UnicastRef.java:322)
        at sun.rmi.registry.RegistryImpl_Stub.lookup(Unknown Source)
        at java.rmi.Naming.lookup(Naming.java:84)
        at org.springframework.remoting.rmi.RmiClientInterceptor.lookupStub(RmiClientInterceptor.java:200)
        ... 18 more
Caused by: java.net.SocketException: Connection reset
        at java.net.SocketInputStream.read(SocketInputStream.java:168)
        at java.io.BufferedInputStream.fill(BufferedInputStream.java:218)
        at java.io.BufferedInputStream.read(BufferedInputStream.java:237)
        at java.io.DataInputStream.readByte(DataInputStream.java:248)
        at sun.rmi.transport.tcp.TCPChannel.createConnection(TCPChannel.java:228)
        ... 23 more
问题描述：在同一台linux服务器同时发布N个RMI服务，当这个N大于某个数据时，有的服务被调用时就报了这个异常，调用该服务的客户端有的连接正常，有的连接会报这个错误，我关掉了任意一个正常或非正常的服务，其他所有服务都通了，这个问题貌似是linux对连接数做了限制吗？有知道的rmi哥哥或者linux哥哥指点下

问题补充：

suziwen 写道

看看这个或许有帮助

http://blog.csdn.net/guowake/article/details/6615728

$ ulimit -a
core file size          (blocks, -c) 0
data seg size           (kbytes, -d) unlimited
scheduling priority             (-e) 0
file size               (blocks, -f) unlimited
pending signals                 (-i) 256619
max locked memory       (kbytes, -l) 64
max memory size         (kbytes, -m) unlimited
open files                      (-n) 10240
pipe size            (512 bytes, -p) 8
POSIX message queues     (bytes, -q) 819200
real-time priority              (-r) 0
stack size              (kbytes, -s) 10240
cpu time               (seconds, -t) unlimited
max user processes              (-u) 1024
virtual memory          (kbytes, -v) unlimited
file locks                      (-x) unlimited

这是nofile已经做了设置了，tcp连接多了，貌似会报can't open too mary file的错，这个帖子好像没帮助

还有看看服务器防火墙是不是也做了限制

问题补充：

suziwen 写道

看看这个或许有帮助

http://blog.csdn.net/guowake/article/details/6615728

还有看看服务器防火墙是不是也做了限制

这防火墙的限制怎么查看呢

问题补充：

wangqj 写道

linux默认1024个连接

大概多少个rmi服务，每个服务峰值连接多少，当然这个限制可以修改

你说的1024个连接时哪种连接呢，

我就发布了12个RMI服务，第13个就报错了，好像跟连接数没有关系似的，连接应该不超过1024，

下面是linux ulimit -a 命令看到的
$ ulimit -a
core file size          (blocks, -c) 0
data seg size           (kbytes, -d) unlimited
scheduling priority             (-e) 0
file size               (blocks, -f) unlimited
pending signals                 (-i) 256619
max locked memory       (kbytes, -l) 64
max memory size         (kbytes, -m) unlimited
open files                      (-n) 10240
pipe size            (512 bytes, -p) 8
POSIX message queues     (bytes, -q) 819200
real-time priority              (-r) 0
stack size              (kbytes, -s) 10240
cpu time               (seconds, -t) unlimited
max user processes              (-u) 1024
virtual memory          (kbytes, -v) unlimited
file locks                      (-x) unlimited

问题补充：

wangqj 写道

当你发布第13个的时候，telnet一下是否有问题，是不是端口被占用了？你的异常是客户端报的，你看服务端是否启动了？有没有什么异常

发布到第13个的时候，服务启动没有报错，客户端掉用这些服务就会报错，
同一个服务有的客户端可以正常访问，有的客户端端访问报了我贴的异常，

telnet端口是连上后马上断掉。可以正常连接的端口是不会马上断掉的。