Question

我正在尝试使用JGroups组播包含许多ResultSet的Serializable对象。由于遵循以下if语句，该对象似乎已收到：

if(msg.getObject() instanceof State)

但是，当我尝试在此对象包含的ResultSet上运行操作时，我在此行获得NullPointer异常：

while(rs.next()) {

这是堆栈跟踪：

Dec 10, 2013 3:08:41 PM org.jgroups.logging.JDKLogImpl error
SEVERE: JGRP000019: failed passing message to receiver: %s
java.lang.NullPointerException
    at AuctionImpl.receiveState(AuctionImpl.java:413)
    at AuctionImpl.receivePrivateMessage(AuctionImpl.java:335)
    at AuctionImpl.access$100(AuctionImpl.java:9)
    at AuctionImpl$1.receive(AuctionImpl.java:49)
    at org.jgroups.JChannel.up(JChannel.java:738)
    at org.jgroups.stack.ProtocolStack.up(ProtocolStack.java:1019)
    at org.jgroups.stack.Protocol.up(Protocol.java:409)
    at org.jgroups.protocols.FRAG2.up(FRAG2.java:182)
    at org.jgroups.protocols.FlowControl.up(FlowControl.java:434)
    at org.jgroups.stack.Protocol.up(Protocol.java:409)
    at org.jgroups.protocols.pbcast.STABLE.up(STABLE.java:294)
    at org.jgroups.protocols.UNICAST3.removeAndDeliver(UNICAST3.java:791)
    at org.jgroups.protocols.UNICAST3.handleDataReceived(UNICAST3.java:703)
    at org.jgroups.protocols.UNICAST3.up(UNICAST3.java:381)
    at org.jgroups.protocols.pbcast.NAKACK2.up(NAKACK2.java:600)
    at org.jgroups.protocols.BARRIER.up(BARRIER.java:103)
    at org.jgroups.protocols.VERIFY_SUSPECT.up(VERIFY_SUSPECT.java:147)
    at org.jgroups.protocols.FD.up(FD.java:255)
    at org.jgroups.protocols.FD_SOCK.up(FD_SOCK.java:301)
    at org.jgroups.protocols.MERGE2.up(MERGE2.java:209)
    at org.jgroups.protocols.Discovery.up(Discovery.java:379)
    at org.jgroups.protocols.TP.passMessageUp(TP.java:1399)
    at org.jgroups.protocols.TP$MyHandler.run(TP.java:1585)
    at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:895)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:918)
    at java.lang.Thread.run(Thread.java:680)

有人可以让我知道我可能做错了什么来得到这个错误吗？

Answer 1

请先使用Util.objectFromByteBuffer（msg.getBuffer（））反序列化您的对象，然后再执行任何操作。

严重：JGRP000019：将消息传递给接收者失败：％s

1 个答案: