[infinispan-issues] [JBoss JIRA] (ISPN-3190) Memcached server throwing NullPointerException if the mashaller is not explicitly set

[Martin Gencur (JIRA)]

    [ https://issues.jboss.org/browse/ISPN-3190?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12779486#comment-12779486 ] 

Martin Gencur commented on ISPN-3190:
-------------------------------------

In other words, it turns out that we always need to define and specify the marshaller when using whatever Memcached client. This complicates things in Infinispan Server, users would need to add a specific module with the Marshaller and enable it.
                
> Memcached server throwing NullPointerException if the mashaller is not explicitly set
> -------------------------------------------------------------------------------------
>
>                 Key: ISPN-3190
>                 URL: https://issues.jboss.org/browse/ISPN-3190
>             Project: Infinispan
>          Issue Type: Bug
>          Components: Server
>    Affects Versions: 5.3.0.CR1
>            Reporter: Martin Gencur
>            Assignee: Galder Zamarreño
>             Fix For: 5.3.0.Final
>
>
> According to the tutorial at https://docs.jboss.org/author/display/ISPN/Interoperability+between+Embedded+and+Remote+Server+Endpoints it is not necessary to specify a special marshaller under normal circumstances. However, the Memcached server seems to require it in any case and the Memcached client's "get" operation fails because we did not set any marshaller for the compatibility mode and it remained null. Note that I'm not using SpyMemcached.
> My understanding is that even if I use SpyMemcached to retrieve the entry, it will be found and retrieved but without the marshaller I simply won't understand the returned value. But something will be returned. Is my assumption correct? 
> {code}
> 2013-06-05 14:12:19,054 TRACE (MemcachedServerWorker-6) [org.infinispan.container.EntryFactoryImpl] Retrieved from container ImmortalCacheEntry{key=4, value=MetadataImmortalCacheValue {value=v1, metadata=EmbeddedMetadata{lifespan=-1, maxIdle=-1, version=ServerEntryVersion(1)}}}
> 2013-06-05 14:12:19,054 TRACE (MemcachedServerWorker-6) [org.infinispan.interceptors.CallInterceptor] Executing command: GetKeyValueCommand {key=4, flags=[OPERATION_MEMCACHED]}.
> 2013-06-05 14:12:19,054 TRACE (MemcachedServerWorker-6) [org.infinispan.commands.read.GetKeyValueCommand] Found entry ImmortalCacheEntry{key=4, value=MetadataImmortalCacheValue {value=v1, metadata=EmbeddedMetadata{lifespan=-1, maxIdle=-1, version=ServerEntryVersion(1)}}}
> 2013-06-05 14:12:19,055 ERROR (MemcachedServerWorker-6) [org.infinispan.interceptors.InvocationContextInterceptor] ISPN000136: Execution error
> java.lang.NullPointerException
> 	at org.infinispan.server.memcached.MemcachedTypeConverter.marshall(MemcachedTypeConverter.scala:58)
> 	at org.infinispan.server.memcached.MemcachedTypeConverter.unboxValue(MemcachedTypeConverter.scala:45)
> 	at org.infinispan.server.memcached.MemcachedTypeConverter.unboxValue(MemcachedTypeConverter.scala:37)
> 	at org.infinispan.interceptors.compat.TypeConverterInterceptor.visitGetKeyValueCommand(TypeConverterInterceptor.java:93)
> 	at org.infinispan.commands.read.GetKeyValueCommand.acceptVisitor(GetKeyValueCommand.java:62)
> 	at org.infinispan.interceptors.base.CommandInterceptor.invokeNextInterceptor(CommandInterceptor.java:120)
> 	at org.infinispan.interceptors.InvocationContextInterceptor.handleAll(InvocationContextInterceptor.java:128)
> 	at org.infinispan.interceptors.InvocationContextInterceptor.handleDefault(InvocationContextInterceptor.java:92)
> 	at org.infinispan.commands.AbstractVisitor.visitGetKeyValueCommand(AbstractVisitor.java:96)
> 	at org.infinispan.commands.read.GetKeyValueCommand.acceptVisitor(GetKeyValueCommand.java:62)
> 	at org.infinispan.interceptors.InterceptorChain.invoke(InterceptorChain.java:343)
> 	at org.infinispan.CacheImpl.getCacheEntry(CacheImpl.java:399)
> 	at org.infinispan.DecoratedCache.getCacheEntry(DecoratedCache.java:514)
> 	at org.infinispan.server.memcached.MemcachedDecoder.get(MemcachedDecoder.scala:122)
> 	at org.infinispan.server.core.AbstractProtocolDecoder.decodeKey(AbstractProtocolDecoder.scala:121)
> 	at org.infinispan.server.core.AbstractProtocolDecoder.decode(AbstractProtocolDecoder.scala:75)
> 	at org.infinispan.server.core.AbstractProtocolDecoder.decode(AbstractProtocolDecoder.scala:49)
> 	at org.jboss.netty.handler.codec.replay.ReplayingDecoder.callDecode(ReplayingDecoder.java:500)
> 	at org.jboss.netty.handler.codec.replay.ReplayingDecoder.messageReceived(ReplayingDecoder.java:435)
> 	at org.infinispan.server.core.AbstractProtocolDecoder.messageReceived(AbstractProtocolDecoder.scala:385)
> 	at org.jboss.netty.channel.SimpleChannelUpstreamHandler.handleUpstream(SimpleChannelUpstreamHandler.java:70)
> 	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:268)
> 	at org.jboss.netty.channel.Channels.fireMessageReceived(Channels.java:255)
> 	at org.jboss.netty.channel.socket.nio.NioWorker.read(NioWorker.java:88)
> 	at org.jboss.netty.channel.socket.nio.AbstractNioWorker.process(AbstractNioWorker.java:107)
> 	at org.jboss.netty.channel.socket.nio.AbstractNioSelector.run(AbstractNioSelector.java:312)
> 	at org.jboss.netty.channel.socket.nio.AbstractNioWorker.run(AbstractNioWorker.java:88)
> 	at org.jboss.netty.channel.socket.nio.NioWorker.run(NioWorker.java:178)
> 	at org.jboss.netty.util.ThreadRenamingRunnable.run(ThreadRenamingRunnable.java:108)
> 	at org.jboss.netty.util.internal.DeadLockProofWorker$1.run(DeadLockProofWorker.java:42)
> 	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
> 	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
> 	at java.lang.Thread.run(Thread.java:722)
> {code}

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