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Type: Bug
Resolution: Done
Priority: Major
Fix Version/s: 3.4.2, 3.5
Affects Version/s: 3.4
Labels:
None

Steps to Reproduce:

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1) Node A starts and becomes master.
2) Node B starts and Node A crashes.
3) Before becoming the new master, Node B calls channel.getState()
4) NullPointer occurs

configuration:

<config xmlns="urn:org:jgroups"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="urn:org:jgroups http://www.jgroups.org/schema/JGroups-3.4.xsd">
<UDP
mcast_port="${jgroups.udp.mcast_port:45588}"
tos="8"
ucast_recv_buf_size="5M"
ucast_send_buf_size="640K"
mcast_recv_buf_size="5M"
mcast_send_buf_size="640K"
loopback="true"
max_bundle_size="64K"
max_bundle_timeout="30"
ip_ttl="${jgroups.udp.ip_ttl:8}"
enable_diagnostics="true"
thread_naming_pattern="cl"
singleton_name="tp_singleton1"
timer_type="new3"
timer.min_threads="4"
timer.max_threads="10"
timer.keep_alive_time="3000"
timer.queue_max_size="500"

thread_pool.enabled="true"
thread_pool.min_threads="2"
thread_pool.max_threads="8"
thread_pool.keep_alive_time="5000"
thread_pool.queue_enabled="true"
thread_pool.queue_max_size="10000"
thread_pool.rejection_policy="discard"

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="discard"/>

<PING timeout="2000"
num_initial_members="20"/>
<MERGE2 max_interval="30000"
min_interval="10000"/>
<FD_SOCK/>
<FD_ALL/>
<VERIFY_SUSPECT timeout="1500" />
<BARRIER />
<pbcast.NAKACK2 xmit_interval="500"
xmit_table_num_rows="100"
xmit_table_msgs_per_row="2000"
xmit_table_max_compaction_time="30000"
max_msg_batch_size="500"
use_mcast_xmit="false"
discard_delivered_msgs="true"/>
<UNICAST3 xmit_interval="500"
xmit_table_num_rows="100"
xmit_table_msgs_per_row="2000"
xmit_table_max_compaction_time="60000"
conn_expiry_timeout="0"
max_msg_batch_size="500"/>
<pbcast.STABLE stability_delay="1000" desired_avg_gossip="50000"
max_bytes="4M"/>
<pbcast.GMS print_local_addr="true" join_timeout="3000"
view_bundling="true"/>
<UFC max_credits="2M"
min_threshold="0.4"/>
<MFC max_credits="2M"
min_threshold="0.4"/>
<FRAG2 frag_size="60K" />
<RSVP resend_interval="2000" timeout="10000"/>
<pbcast.STATE_TRANSFER />
<CENTRAL_LOCK num_backups="2"/>
</config>

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1) Node A starts and becomes master. 2) Node B starts and Node A crashes. 3) Before becoming the new master, Node B calls channel.getState() 4) NullPointer occurs configuration: <config xmlns="urn:org:jgroups" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="urn:org:jgroups http://www.jgroups.org/schema/JGroups-3.4.xsd "> <UDP mcast_port="${jgroups.udp.mcast_port:45588}" tos="8" ucast_recv_buf_size="5M" ucast_send_buf_size="640K" mcast_recv_buf_size="5M" mcast_send_buf_size="640K" loopback="true" max_bundle_size="64K" max_bundle_timeout="30" ip_ttl="${jgroups.udp.ip_ttl:8}" enable_diagnostics="true" thread_naming_pattern="cl" singleton_name="tp_singleton1" timer_type="new3" timer.min_threads="4" timer.max_threads="10" timer.keep_alive_time="3000" timer.queue_max_size="500" thread_pool.enabled="true" thread_pool.min_threads="2" thread_pool.max_threads="8" thread_pool.keep_alive_time="5000" thread_pool.queue_enabled="true" thread_pool.queue_max_size="10000" thread_pool.rejection_policy="discard" 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="discard"/> <PING timeout="2000" num_initial_members="20"/> <MERGE2 max_interval="30000" min_interval="10000"/> <FD_SOCK/> <FD_ALL/> <VERIFY_SUSPECT timeout="1500" /> <BARRIER /> <pbcast.NAKACK2 xmit_interval="500" xmit_table_num_rows="100" xmit_table_msgs_per_row="2000" xmit_table_max_compaction_time="30000" max_msg_batch_size="500" use_mcast_xmit="false" discard_delivered_msgs="true"/> <UNICAST3 xmit_interval="500" xmit_table_num_rows="100" xmit_table_msgs_per_row="2000" xmit_table_max_compaction_time="60000" conn_expiry_timeout="0" max_msg_batch_size="500"/> <pbcast.STABLE stability_delay="1000" desired_avg_gossip="50000" max_bytes="4M"/> <pbcast.GMS print_local_addr="true" join_timeout="3000" view_bundling="true"/> <UFC max_credits="2M" min_threshold="0.4"/> <MFC max_credits="2M" min_threshold="0.4"/> <FRAG2 frag_size="60K" /> <RSVP resend_interval="2000" timeout="10000"/> <pbcast.STATE_TRANSFER /> <CENTRAL_LOCK num_backups="2"/> </config>

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1) Node A starts and becomes master.
2) Node B starts and Node A crashes.
3) Before becoming the new master, Node B calls channel.getState()
4) NullPointer occurs

Stacktrace:

java.lang.NullPointerException
at java.io.ByteArrayInputStream.<init>(ByteArrayInputStream.java:106)
at org.jgroups.blocks.MessageDispatcher.handleUpEvent(MessageDispatcher.java:567)
at org.jgroups.blocks.MessageDispatcher$ProtocolAdapter.up(MessageDispatcher.java:667)
at org.jgroups.JChannel.up(JChannel.java:643)
at org.jgroups.stack.ProtocolStack.up(ProtocolStack.java:1015)
at org.jgroups.protocols.Locking.up(Locking.java:269)
at org.jgroups.protocols.pbcast.STATE_TRANSFER.handleViewChange(STATE_TRANSFER.java:293)
at org.jgroups.protocols.pbcast.STATE_TRANSFER.up(STATE_TRANSFER.java:168)
at org.jgroups.protocols.RSVP.up(RSVP.java:187)
at org.jgroups.protocols.FRAG2.up(FRAG2.java:165)
at org.jgroups.protocols.FlowControl.up(FlowControl.java:381)
at org.jgroups.protocols.FlowControl.up(FlowControl.java:381)
at org.jgroups.protocols.pbcast.GMS.castViewChange(GMS.java:574)
at org.jgroups.protocols.pbcast.CoordGmsImpl.handleMembershipChange(CoordGmsImpl.java:219)
at org.jgroups.protocols.pbcast.GMS$ViewHandler.process(GMS.java:1633)
at org.jgroups.protocols.pbcast.GMS$ViewHandler.run(GMS.java:1587)
at java.lang.Thread.run(Thread.java:724)

The issue seems to be related to this:

in STATE_TRANSFER, line 292-293:
Exception ex=new EOFException("state provider " + old_coord + " left");
up_prot.up(new Event(Event.GET_STATE_OK, new StateTransferResult(ex)));
(buffer field is not set on event object)

after, in MessageDispatcher 567:
ByteArrayInputStream input=new ByteArrayInputStream(result.getBuffer());
causes NullPointer, since result.getBuffer() returns null.

A null-check here should resolve this issue, or an empty buffer could be set in StateTransferResult class.

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