Using HotRod with CacheLoader which needs Key2StringMappers tries to use a MarshalledValue as key

Trying to access a key in a cache via HotRod causes an UnsupportedKeyTypeException. This is because the ByteArrayKey is wrapped by a MarshalledValue, and not unmarshalled before the Key2StringMapper can check whether it is a supported type

The stack trace is as follows:
10:42:55,836 ERROR [org.infinispan.interceptors.InvocationContextInterceptor] (HotRodServerWorker-2-10) ISPN000136: Execution error: org.infinispan.loaders.keymappers.UnsupportedKeyTypeException: Unsupported key type: 'org.infinispan.marshall.MarshalledValue' on key: MarshalledValue{instance=ByteArrayKey{data=ByteArray{size=8, hashCode=241dbc8b, array=0x033e057465616d73..}}, serialized=false, cachedHashCode=-1429957546}@1c455c33
at org.infinispan.loaders.jdbc.stringbased.JdbcStringBasedCacheStore.getLockFromKey(JdbcStringBasedCacheStore.java:201)
at org.infinispan.loaders.jdbc.stringbased.JdbcStringBasedCacheStore.getLockFromKey(JdbcStringBasedCacheStore.java:87)
at org.infinispan.loaders.LockSupportCacheStore.load(LockSupportCacheStore.java:127) [infinispan-core-5.1.0-SNAPSHOT.jar:]
at org.infinispan.interceptors.CacheLoaderInterceptor.loadIfNeeded(CacheLoaderInterceptor.java:130) [infinispan-core-5.1.0-SNAPSHOT.jar:]
at org.infinispan.interceptors.CacheLoaderInterceptor.loadIfNeededAndUpdateStats(CacheLoaderInterceptor.java:192) [infinispan-core-5.1.0-SNAPSHOT.jar:]
at org.infinispan.interceptors.CacheLoaderInterceptor.visitGetKeyValueCommand(CacheLoaderInterceptor.java:89) [infinispan-core-5.1.0-SNAPSHOT.jar:]
at org.infinispan.commands.read.GetKeyValueCommand.acceptVisitor(GetKeyValueCommand.java:61) [infinispan-core-5.1.0-SNAPSHOT.jar:]
at org.infinispan.interceptors.base.CommandInterceptor.invokeNextInterceptor(CommandInterceptor.java:119) [infinispan-core-5.1.0-SNAPSHOT.jar:]
at org.infinispan.interceptors.EntryWrappingInterceptor.visitGetKeyValueCommand(EntryWrappingInterceptor.java:103) [infinispan-core-5.1.0-SNAPSHOT.jar:]
at org.infinispan.commands.read.GetKeyValueCommand.acceptVisitor(GetKeyValueCommand.java:61) [infinispan-core-5.1.0-SNAPSHOT.jar:]
at org.infinispan.interceptors.base.CommandInterceptor.invokeNextInterceptor(CommandInterceptor.java:119) [infinispan-core-5.1.0-SNAPSHOT.jar:]
at org.infinispan.interceptors.base.CommandInterceptor.handleDefault(CommandInterceptor.java:133) [infinispan-core-5.1.0-SNAPSHOT.jar:]
at org.infinispan.commands.AbstractVisitor.visitGetKeyValueCommand(AbstractVisitor.java:95) [infinispan-core-5.1.0-SNAPSHOT.jar:]
at org.infinispan.commands.read.GetKeyValueCommand.acceptVisitor(GetKeyValueCommand.java:61) [infinispan-core-5.1.0-SNAPSHOT.jar:]
at org.infinispan.interceptors.base.CommandInterceptor.invokeNextInterceptor(CommandInterceptor.java:119) [infinispan-core-5.1.0-SNAPSHOT.jar:]
at org.infinispan.interceptors.base.CommandInterceptor.handleDefault(CommandInterceptor.java:133) [infinispan-core-5.1.0-SNAPSHOT.jar:]
at org.infinispan.commands.AbstractVisitor.visitGetKeyValueCommand(AbstractVisitor.java:95) [infinispan-core-5.1.0-SNAPSHOT.jar:]
at org.infinispan.commands.read.GetKeyValueCommand.acceptVisitor(GetKeyValueCommand.java:61) [infinispan-core-5.1.0-SNAPSHOT.jar:]
at org.infinispan.interceptors.base.CommandInterceptor.invokeNextInterceptor(CommandInterceptor.java:119) [infinispan-core-5.1.0-SNAPSHOT.jar:]
at org.infinispan.interceptors.MarshalledValueInterceptor.visitGetKeyValueCommand(MarshalledValueInterceptor.java:191) [infinispan-core-5.1.0-SNAPSHOT.jar:]
at org.infinispan.commands.read.GetKeyValueCommand.acceptVisitor(GetKeyValueCommand.java:61) [infinispan-core-5.1.0-SNAPSHOT.jar:]
at org.infinispan.interceptors.base.CommandInterceptor.invokeNextInterceptor(CommandInterceptor.java:119) [infinispan-core-5.1.0-SNAPSHOT.jar:]
at org.infinispan.interceptors.TxInterceptor.enlistReadAndInvokeNext(TxInterceptor.java:192) [infinispan-core-5.1.0-SNAPSHOT.jar:]
at org.infinispan.interceptors.TxInterceptor.visitGetKeyValueCommand(TxInterceptor.java:187) [infinispan-core-5.1.0-SNAPSHOT.jar:]
at org.infinispan.commands.read.GetKeyValueCommand.acceptVisitor(GetKeyValueCommand.java:61) [infinispan-core-5.1.0-SNAPSHOT.jar:]
at org.infinispan.interceptors.base.CommandInterceptor.invokeNextInterceptor(CommandInterceptor.java:119) [infinispan-core-5.1.0-SNAPSHOT.jar:]
at org.infinispan.interceptors.base.CommandInterceptor.handleDefault(CommandInterceptor.java:133) [infinispan-core-5.1.0-SNAPSHOT.jar:]
at org.infinispan.commands.AbstractVisitor.visitGetKeyValueCommand(AbstractVisitor.java:95) [infinispan-core-5.1.0-SNAPSHOT.jar:]
at org.infinispan.commands.read.GetKeyValueCommand.acceptVisitor(GetKeyValueCommand.java:61) [infinispan-core-5.1.0-SNAPSHOT.jar:]
at org.infinispan.interceptors.base.CommandInterceptor.invokeNextInterceptor(CommandInterceptor.java:119) [infinispan-core-5.1.0-SNAPSHOT.jar:]
at org.infinispan.interceptors.CacheMgmtInterceptor.visitGetKeyValueCommand(CacheMgmtInterceptor.java:84) [infinispan-core-5.1.0-SNAPSHOT.jar:]
at org.infinispan.commands.read.GetKeyValueCommand.acceptVisitor(GetKeyValueCommand.java:61) [infinispan-core-5.1.0-SNAPSHOT.jar:]
at org.infinispan.interceptors.base.CommandInterceptor.invokeNextInterceptor(CommandInterceptor.java:119) [infinispan-core-5.1.0-SNAPSHOT.jar:]
at org.infinispan.interceptors.base.CommandInterceptor.handleDefault(CommandInterceptor.java:133) [infinispan-core-5.1.0-SNAPSHOT.jar:]
at org.infinispan.commands.AbstractVisitor.visitGetKeyValueCommand(AbstractVisitor.java:95) [infinispan-core-5.1.0-SNAPSHOT.jar:]
at org.infinispan.interceptors.IsMarshallableInterceptor.visitGetKeyValueCommand(IsMarshallableInterceptor.java:84) [infinispan-core-5.1.0-SNAPSHOT.jar:]
at org.infinispan.commands.read.GetKeyValueCommand.acceptVisitor(GetKeyValueCommand.java:61) [infinispan-core-5.1.0-SNAPSHOT.jar:]
at org.infinispan.interceptors.base.CommandInterceptor.invokeNextInterceptor(CommandInterceptor.java:119) [infinispan-core-5.1.0-SNAPSHOT.jar:]
at org.infinispan.interceptors.InvocationContextInterceptor.handleAll(InvocationContextInterceptor.java:107) [infinispan-core-5.1.0-SNAPSHOT.jar:]
at org.infinispan.interceptors.InvocationContextInterceptor.handleDefault(InvocationContextInterceptor.java:67) [infinispan-core-5.1.0-SNAPSHOT.jar:]
at org.infinispan.commands.AbstractVisitor.visitGetKeyValueCommand(AbstractVisitor.java:95) [infinispan-core-5.1.0-SNAPSHOT.jar:]
at org.infinispan.commands.read.GetKeyValueCommand.acceptVisitor(GetKeyValueCommand.java:61) [infinispan-core-5.1.0-SNAPSHOT.jar:]
at org.infinispan.interceptors.InterceptorChain.invoke(InterceptorChain.java:318) [infinispan-core-5.1.0-SNAPSHOT.jar:]
at org.infinispan.CacheImpl.containsKey(CacheImpl.java:247) [infinispan-core-5.1.0-SNAPSHOT.jar:]
at org.infinispan.CacheImpl.containsKey(CacheImpl.java:240) [infinispan-core-5.1.0-SNAPSHOT.jar:]
at org.infinispan.AbstractDelegatingCache.containsKey(AbstractDelegatingCache.java:242) [infinispan-core-5.1.0-SNAPSHOT.jar:]
at org.infinispan.server.hotrod.Decoder10$.customReadKey(Decoder10.scala:197) [infinispan-server-hotrod-5.1.0-SNAPSHOT.jar:]
at org.infinispan.server.hotrod.HotRodDecoder.customDecodeKey(HotRodDecoder.scala:151) [infinispan-server-hotrod-5.1.0-SNAPSHOT.jar:]
at org.infinispan.server.core.AbstractProtocolDecoder.decodeKey(AbstractProtocolDecoder.scala:118) [infinispan-server-core-5.1.0-SNAPSHOT.jar:]
at org.infinispan.server.core.AbstractProtocolDecoder.decode(AbstractProtocolDecoder.scala:69) [infinispan-server-core-5.1.0-SNAPSHOT.jar:]
at org.infinispan.server.core.AbstractProtocolDecoder.decode(AbstractProtocolDecoder.scala:44) [infinispan-server-core-5.1.0-SNAPSHOT.jar:]
at org.jboss.netty.handler.codec.replay.CustomReplayingDecoder.callDecode(CustomReplayingDecoder.java:250) [infinispan-server-core-5.1.0-SNAPSHOT.jar:]
at org.jboss.netty.handler.codec.replay.CustomReplayingDecoder.messageReceived(CustomReplayingDecoder.java:223) [infinispan-server-core-5.1.0-SNAPSHOT.jar:]
at org.infinispan.server.core.AbstractProtocolDecoder.messageReceived(AbstractProtocolDecoder.scala:351) [infinispan-server-core-5.1.0-SNAPSHOT.jar:]
at org.jboss.netty.channel.SimpleChannelUpstreamHandler.handleUpstream(SimpleChannelUpstreamHandler.java:80) [netty-3.2.5.Final.jar:]
at org.jboss.netty.channel.DefaultChannelPipeline.sendUpstream(DefaultChannelPipeline.java:564) [netty-3.2.5.Final.jar:]
at org.jboss.netty.channel.DefaultChannelPipeline.sendUpstream(DefaultChannelPipeline.java:559) [netty-3.2.5.Final.jar:]
at org.jboss.netty.channel.Channels.fireMessageReceived(Channels.java:274) [netty-3.2.5.Final.jar:]
at org.jboss.netty.channel.Channels.fireMessageReceived(Channels.java:261) [netty-3.2.5.Final.jar:]
at org.jboss.netty.channel.socket.nio.NioWorker.read(NioWorker.java:349) [netty-3.2.5.Final.jar:]
at org.jboss.netty.channel.socket.nio.NioWorker.processSelectedKeys(NioWorker.java:280) [netty-3.2.5.Final.jar:]
at org.jboss.netty.channel.socket.nio.NioWorker.run(NioWorker.java:200) [netty-3.2.5.Final.jar:]
at org.jboss.netty.util.ThreadRenamingRunnable.run(ThreadRenamingRunnable.java:108) [netty-3.2.5.Final.jar:]
at org.jboss.netty.util.internal.DeadLockProofWorker$1.run(DeadLockProofWorker.java:44) [netty-3.2.5.Final.jar:]
at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886) [:1.6.0_29]
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908) [:1.6.0_29]
at java.lang.Thread.run(Thread.java:662) [:1.6.0_29]