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https://issues.apache.org/jira/browse/AVRO-1054?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13416996#comment-13416996
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Mike Percy commented on AVRO-1054:
----------------------------------
Worth noting for future reference that when you see this error on the RPC
client, the Avro RPC server has thrown an uncaught NullPointerException inside
an RPC handler method.
> AvroRuntimeException: Unknown datum type: java.lang.NullPointerException
> ------------------------------------------------------------------------
>
> Key: AVRO-1054
> URL: https://issues.apache.org/jira/browse/AVRO-1054
> Project: Avro
> Issue Type: Bug
> Components: java
> Affects Versions: 1.6.3
> Environment: Linux, Java 1.6
> Reporter: Sushanth
>
> I have a simple messaging protocol, which sends some data, and receives a
> response.
> I am calling
> notification.setStatus(MessageStatus.DELIVERED);client.notify(notification).
> I am getting the following error.
> org.apache.avro.AvroRuntimeException: Unknown datum type:
> java.lang.NullPointerException
> org.apache.avro.AvroRuntimeException: org.apache.avro.AvroRuntimeException:
> Unknown datum type: java.lang.NullPointerException
> at
> org.apache.avro.ipc.specific.SpecificRequestor.readError(SpecificRequestor.java:126)
> at
> org.apache.avro.ipc.Requestor$Response.getResponse(Requestor.java:554)
> at
> org.apache.avro.ipc.Requestor$TransceiverCallback.handleResult(Requestor.java:359)
> at
> org.apache.avro.ipc.Requestor$TransceiverCallback.handleResult(Requestor.java:322)
> at
> org.apache.avro.ipc.NettyTransceiver$NettyClientAvroHandler.messageReceived(NettyTransceiver.java:495)
> at
> org.jboss.netty.channel.SimpleChannelUpstreamHandler.handleUpstream(SimpleChannelUpstreamHandler.java:80)
> at
> org.apache.avro.ipc.NettyTransceiver$NettyClientAvroHandler.handleUpstream(NettyTransceiver.java:477)
> at
> org.jboss.netty.channel.DefaultChannelPipeline.sendUpstream(DefaultChannelPipeline.java:564)
> at
> org.jboss.netty.channel.DefaultChannelPipeline$DefaultChannelHandlerContext.sendUpstream(DefaultChannelPipeline.java:783)
> at
> org.jboss.netty.channel.Channels.fireMessageReceived(Channels.java:302)
> at
> org.jboss.netty.handler.codec.frame.FrameDecoder.unfoldAndFireMessageReceived(FrameDecoder.java:321)
> at
> org.jboss.netty.handler.codec.frame.FrameDecoder.callDecode(FrameDecoder.java:299)
> at
> org.jboss.netty.handler.codec.frame.FrameDecoder.messageReceived(FrameDecoder.java:216)
> at
> org.jboss.netty.channel.SimpleChannelUpstreamHandler.handleUpstream(SimpleChannelUpstreamHandler.java:80)
> at
> org.jboss.netty.channel.DefaultChannelPipeline.sendUpstream(DefaultChannelPipeline.java:564)
> at
> org.jboss.netty.channel.DefaultChannelPipeline.sendUpstream(DefaultChannelPipeline.java:559)
> at
> org.jboss.netty.channel.Channels.fireMessageReceived(Channels.java:274)
> at
> org.jboss.netty.channel.Channels.fireMessageReceived(Channels.java:261)
> at org.jboss.netty.channel.socket.nio.NioWorker.read(NioWorker.java:351)
> at
> org.jboss.netty.channel.socket.nio.NioWorker.processSelectedKeys(NioWorker.java:282)
> at org.jboss.netty.channel.socket.nio.NioWorker.run(NioWorker.java:202)
> at
> org.jboss.netty.util.ThreadRenamingRunnable.run(ThreadRenamingRunnable.java:108)
> at
> org.jboss.netty.util.internal.DeadLockProofWorker$1.run(DeadLockProofWorker.java:44)
> at
> java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
> at
> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
> at java.lang.Thread.run(Thread.java:662)
> When I do
> notification.setStatus(MessageStatus.READ);client.notify(notification);
> things are fine.
> my avpr is
> {"namespace": "com.company.avro.generated",
> "protocol": "CallResponse",
> "types": [
> {"name": "Notification", "type": "record",
> "fields": [
> {"name": "recipientID", "type": "string"},
> {"name": "message", "type": "string"},
> {"name": "senderID", "type": "string"},
> {"name": "messageID", "type": "string"},
> {"name": "transactionID", "type": "string"},
> {"name": "submitTimestamp", "type": "string"},
> {"name": "msgNotification", "type": "string"},
> {"name": "status", "type": {"type": "enum", "name":
> "MessageStatus",
> "symbols": ["DELIVERED", "FAILED", "READ"]}}
> ]
> },
> {"name": "NotificationAck", "type": "record",
> "fields": [{"name": "response", "type": "string"}]
> }
> ],
> "messages": {
> "send": {
> "request": [{"name": "notification", "type": "Notification"}],
> "response": "NotificationAck"
> }
> }
> }
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