[jboss-jira] [JBoss JIRA] Commented: (JGRP-616) NullPointerException in Multiplexer.java

[Vladimir Blagojevic (JIRA)]

    [ http://jira.jboss.com/jira/browse/JGRP-616?page=comments#action_12385924 ] 
            
Vladimir Blagojevic commented on JGRP-616:
------------------------------------------

No no. State is not fetched automatically. The option that you have set is explained here [1]. For automatic state fetching you need to use this method [2] or connect and then fetch state [3].

So what was happening is that multiplexed channel got disconnected but when it reattempted to connect and fetch state there was no pair multiplexed channel running on the other node (probably it went down as well). I'll see how we can handle this event in a less scary way than throwing an Exception.  

Please use one of the fetch state methods [2], [3] and report back.

Regards.

[1] http://www.jgroups.org/javagroupsnew/docs/manual/html/user-channel.html#SettingOptions
[2] http://www.jgroups.org/javagroupsnew/docs/manual/html/user-channel.html#d0e1139
[3] http://www.jgroups.org/javagroupsnew/docs/manual/html/user-channel.html#d0e1463

> NullPointerException in Multiplexer.java
> ----------------------------------------
>
>                 Key: JGRP-616
>                 URL: http://jira.jboss.com/jira/browse/JGRP-616
>             Project: JGroups
>          Issue Type: Bug
>    Affects Versions: 2.6
>         Environment: Debian Etch,
> Java HotSpot(TM) Server VM (build 1.6.0_01-b06, mixed mode), 
> Version:      2.6.0 cr-1
> CVS:          $Id: Version.java,v 1.58 2007/10/26 21:34:01 rachmatowicz Exp $
>            Reporter: Robert Newson
>         Assigned To: Vladimir Blagojevic
>             Fix For: 2.6
>
>
> When starting 4 servers, which each join 8 different ReplicatedHashMaps over a multiplexed channel, we frequently get this;
> 2007-11-03 09:39:48,774 ERROR [STREAMING_STATE_TRANSFER sender,udp,192.168.164.227:33709] log.GeronimoLog (GeronimoLog.java:108) - failed returning the application state, will return null
> java.lang.IllegalArgumentException: State provider 192.168.164.227:33709 does not have service with id space
>         at org.jgroups.mux.Multiplexer.handleStateRequest(Multiplexer.java:640)
>         at org.jgroups.mux.Multiplexer.up(Multiplexer.java:365)
>         at org.jgroups.JChannel.up(JChannel.java:1147)
>         at org.jgroups.stack.ProtocolStack.up(ProtocolStack.java:341)
>         at org.jgroups.protocols.pbcast.FLUSH.up(FLUSH.java:428)
>         at org.jgroups.protocols.pbcast.STREAMING_STATE_TRANSFER$StateProviderHandler.process(STREAMING_STATE_TRANSFER.java:731)
>         at org.jgroups.protocols.pbcast.STREAMING_STATE_TRANSFER$StateProviderThreadSpawner$1.run(STREAMING_STATE_TRANSFER.java:648)
>         at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:885)
>         at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:907)
>         at java.lang.Thread.run(Thread.java:619)
> This is using the following stacks.xml;
> <protocol_stacks>
>   <stack name="udp">
>     <config>
>       <UDP
> 	  mcast_addr="${jgroups.udp.mcast_addr}"
> 	  mcast_port="${jgroups.udp.mcast_port}"
> 	  tos="8"
> 	  ucast_recv_buf_size="20000000"
> 	  ucast_send_buf_size="640000"
> 	  mcast_recv_buf_size="25000000"
> 	  mcast_send_buf_size="640000"
> 	  loopback="false"
> 	  discard_incompatible_packets="true"
> 	  max_bundle_size="64000"
> 	  max_bundle_timeout="30"
> 	  use_incoming_packet_handler="true"
> 	  ip_ttl="${jgroups.udp.ip_ttl:32}"
> 	  enable_bundling="true"
> 	  enable_diagnostics="false"
> 	  thread_naming_pattern="cl"
> 	  use_concurrent_stack="true"
> 	  thread_pool.enabled="true"
> 	  thread_pool.min_threads="1"
> 	  thread_pool.max_threads="25"
> 	  thread_pool.keep_alive_time="5000"
> 	  thread_pool.queue_enabled="false"
> 	  thread_pool.queue_max_size="100"
> 	  thread_pool.rejection_policy="Run"
> 	  oob_thread_pool.enabled="true"
> 	  oob_thread_pool.min_threads="1"
> 	  oob_thread_pool.max_threads="8"
> 	  oob_thread_pool.keep_alive_time="5000"
> 	  oob_thread_pool.queue_enabled="false"
> 	  oob_thread_pool.queue_max_size="100"
> 	  oob_thread_pool.rejection_policy="Run"/>
>       <PING timeout="${jgroups.ping.timeout:15000}"
> 	    num_initial_members="${jgroups.ping.num_initial_members:32}"/>
>       <MERGE2 max_interval="30000"
> 	      min_interval="10000"/>
>       <FD_SOCK/>
>       <FD timeout="10000" max_tries="5" shun="true"/>
>       <VERIFY_SUSPECT timeout="1500" />
>       <BARRIER />
>       <pbcast.NAKACK
> 	  use_mcast_xmit="false" gc_lag="10"
> 	  retransmit_timeout="300,600,1200,2400,4800"
> 	  discard_delivered_msgs="true"/>
>       <UNICAST timeout="300,600,1200,2400,3600"/>
>       <pbcast.STABLE stability_delay="1000" desired_avg_gossip="50000"
> 		     max_bytes="400000"/>
>       <VIEW_SYNC avg_send_interval="60000"  />
>       <pbcast.GMS print_local_addr="false" join_timeout="10000"
> 		  join_retry_timeout="2000" shun="true"
> 		  view_bundling="true" view_ack_collection_timeout="5000"/>
>       <FC max_credits="20000000"
> 	  min_threshold="0.10"/>
>       <FRAG2 frag_size="60000" />
>       <pbcast.STREAMING_STATE_TRANSFER />
>       <pbcast.FLUSH timeout="0"/>
>     </config>  
>   </stack>
> </protocol_stacks>

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