I am using mostly unaltered versions of the MyHistorian and ValueHistory included in the SDK samples.
I am trying to implement a way to manually insert values into the ValueHistory. I created this function :

class ValueHistory {
…
public boolean manualInsert(DataValue[] newValues)
{
System.out.println(” YOU GOT HERE!”);
return true;
}
…
}

Which I access through calling the client’s historyUpdateData:

@Override
public void onUpdateData(ServiceContext serviceContext, Object dataset,
NodeId nodeId, UaNode node, DataValue[] updateValues,
PerformUpdateType performInsertReplace,
StatusCode[] operationResults, DiagnosticInfo[] operationDiagnostics)
throws StatusException {
if(performInsertReplace == PerformUpdateType.Insert)
{
if(variableHistories == null)
{
System.out.println(” VARIABLEHISTORIES WAS NULL”);
} else if (variableHistories.get(node) == null){
System.out.println(” VARIABLEHISTORY WAS NULL”);
} else
System.out.println(” RIGHT PLACE!”);
variableHistories.get(node).manualInsert(updateValues);
} else
throw new StatusException(StatusCodes.Bad_HistoryOperationUnsupported);
}

However, for some reason, even though the manualInsert function does essentially nothing, calling it gives me an error:

05/01/2016 14:13:20.729 ERROR While handling HistoryUpdateRequest (id=449012442)
HistoryUpdateDetails=class org.opcfoundation.ua.builtintypes.ExtensionObject[1]
[0]={class org.opcfoundation.ua.builtintypes.ExtensionObject}UpdateDataDetails: UpdateDataDetails (id=546516673)
PerformInsertReplace=PerformUpdateType (id=1880919416)
value=1
ordinal=0
name=Insert
UpdateValues=class org.opcfoundation.ua.builtintypes.DataValue[10]
[0]={class org.opcfoundation.ua.builtintypes.DataValue}DataValue(value=(null), statusCode=GOOD (0x00000000) “”, sourceTimestamp=null, sourcePicoseconds=0, serverTimestamp=null, serverPicoseconds=0)
[1]={class org.opcfoundation.ua.builtintypes.DataValue}DataValue(value=1.0, statusCode=GOOD (0x00000000) “”, sourceTimestamp=01/31/16 22:00:01.0000000 GMT, sourcePicoseconds=0, serverTimestamp=01/31/16 22:00:01.0000000 GMT, serverPicoseconds=0)
[2]={class org.opcfoundation.ua.builtintypes.DataValue}DataValue(value=2.0, statusCode=GOOD (0x00000000) “”, sourceTimestamp=01/31/16 22:00:02.0000000 GMT, sourcePicoseconds=0, serverTimestamp=01/31/16 22:00:02.0000000 GMT, serverPicoseconds=0)
[3]={class org.opcfoundation.ua.builtintypes.DataValue}DataValue(value=3.0, statusCode=GOOD (0x00000000) “”, sourceTimestamp=01/31/16 22:00:03.0000000 GMT, sourcePicoseconds=0, serverTimestamp=01/31/16 22:00:03.0000000 GMT, serverPicoseconds=0)
[4]={class org.opcfoundation.ua.builtintypes.DataValue}DataValue(value=4.0, statusCode=GOOD (0x00000000) “”, sourceTimestamp=01/31/16 22:00:04.0000000 GMT, sourcePicoseconds=0, serverTimestamp=01/31/16 22:00:04.0000000 GMT, serverPicoseconds=0)
[5]={class org.opcfoundation.ua.builtintypes.DataValue}DataValue(value=5.0, statusCode=GOOD (0x00000000) “”, sourceTimestamp=01/31/16 22:00:05.0000000 GMT, sourcePicoseconds=0, serverTimestamp=01/31/16 22:00:05.0000000 GMT, serverPicoseconds=0)
[6]={class org.opcfoundation.ua.builtintypes.DataValue}DataValue(value=6.0, statusCode=GOOD (0x00000000) “”, sourceTimestamp=01/31/16 22:00:06.0000000 GMT, sourcePicoseconds=0, serverTimestamp=01/31/16 22:00:06.0000000 GMT, serverPicoseconds=0)
[7]={class org.opcfoundation.ua.builtintypes.DataValue}DataValue(value=7.0, statusCode=GOOD (0x00000000) “”, sourceTimestamp=01/31/16 22:00:07.0000000 GMT, sourcePicoseconds=0, serverTimestamp=01/31/16 22:00:07.0000000 GMT, serverPicoseconds=0)
[8]={class org.opcfoundation.ua.builtintypes.DataValue}DataValue(value=8.0, statusCode=GOOD (0x00000000) “”, sourceTimestamp=01/31/16 22:00:08.0000000 GMT, sourcePicoseconds=0, serverTimestamp=01/31/16 22:00:08.0000000 GMT, serverPicoseconds=0)
[9]={class org.opcfoundation.ua.builtintypes.DataValue}DataValue(value=9.0, statusCode=GOOD (0x00000000) “”, sourceTimestamp=01/31/16 22:00:09.0000000 GMT, sourcePicoseconds=0, serverTimestamp=01/31/16 22:00:09.0000000 GMT, serverPicoseconds=0)
NodeId={class org.opcfoundation.ua.builtintypes.NodeId}ns=2;s=SetPoint9b56f455-0275-40ec-aca1-3adcda644779

RequestHeader=RequestHeader (id=365817744)
TimeoutHint={class org.opcfoundation.ua.builtintypes.UnsignedInteger}30000
ReturnDiagnostics={class org.opcfoundation.ua.builtintypes.UnsignedInteger}0
Timestamp={class org.opcfoundation.ua.builtintypes.DateTime}05/01/16 11:13:20.7250000 GMT
AdditionalHeader=null
AuthenticationToken={class org.opcfoundation.ua.builtintypes.NodeId}i=1812299361
RequestHandle={class org.opcfoundation.ua.builtintypes.UnsignedInteger}810
AuditEntryId=null

ServiceFault: Bad_InternalError (0x80020000) “An internal error occurred as a result of a programming or configuration error.”
Diagnostic Info: java.lang.NullPointerException
at fi.opc.ua.server.MyHistorian.onUpdateData(MyHistorian.java:284)
at com.prosysopc.ua.server.HistoryManager.historyUpdate(Unknown Source)
at com.prosysopc.ua.server.NodeManagerTable.historyUpdate(Unknown Source)
at com.prosysopc.ua.server.AttributeServiceHandler.updateNodeHistory(Unknown Source)
at com.prosysopc.ua.server.AttributeServiceHandler.historyUpdate(Unknown Source)
at com.prosysopc.ua.server.AttributeServiceHandler.onHistoryUpdate(Unknown Source)
at sun.reflect.GeneratedMethodAccessor6.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at org.opcfoundation.ua.application.ServiceHandlerComposition$1.serve(Unknown Source)
at org.opcfoundation.ua.application.ServiceHandlerComposition.serve(Unknown Source)
at org.opcfoundation.ua.transport.tcp.nio.OpcTcpServerSecureChannel.handleSecureMessage(Unknown Source)
at org.opcfoundation.ua.transport.tcp.nio.OpcTcpServerConnection.handleSecureMessage(Unknown Source)
at org.opcfoundation.ua.transport.tcp.nio.OpcTcpServerConnection$4.onMessageComplete(Unknown Source)
at org.opcfoundation.ua.transport.tcp.nio.SecureInputMessageBuilder.fireComplete(Unknown Source)
at org.opcfoundation.ua.transport.tcp.nio.SecureInputMessageBuilder.setMessage(Unknown Source)
at org.opcfoundation.ua.transport.tcp.nio.SecureInputMessageBuilder$1.run(Unknown Source)
at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
at java.lang.Thread.run(Unknown Source)

at org.opcfoundation.ua.application.ServiceHandlerComposition$1.serve(Unknown Source)
at org.opcfoundation.ua.application.ServiceHandlerComposition.serve(Unknown Source)
at org.opcfoundation.ua.transport.tcp.nio.OpcTcpServerSecureChannel.handleSecureMessage(Unknown Source)
at org.opcfoundation.ua.transport.tcp.nio.OpcTcpServerConnection.handleSecureMessage(Unknown Source)
at org.opcfoundation.ua.transport.tcp.nio.OpcTcpServerConnection$4.onMessageComplete(Unknown Source)
at org.opcfoundation.ua.transport.tcp.nio.SecureInputMessageBuilder.fireComplete(Unknown Source)
at org.opcfoundation.ua.transport.tcp.nio.SecureInputMessageBuilder.setMessage(Unknown Source)
at org.opcfoundation.ua.transport.tcp.nio.SecureInputMessageBuilder$1.run(Unknown Source)
at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
at java.lang.Thread.run(Unknown Source)
Caused by: java.lang.NullPointerException
at fi.opc.ua.server.MyHistorian.onUpdateData(MyHistorian.java:284)
at com.prosysopc.ua.server.HistoryManager.historyUpdate(Unknown Source)
at com.prosysopc.ua.server.NodeManagerTable.historyUpdate(Unknown Source)
at com.prosysopc.ua.server.AttributeServiceHandler.updateNodeHistory(Unknown Source)
at com.prosysopc.ua.server.AttributeServiceHandler.historyUpdate(Unknown Source)
at com.prosysopc.ua.server.AttributeServiceHandler.onHistoryUpdate(Unknown Source)
at sun.reflect.GeneratedMethodAccessor6.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
… 11 more

What could be the cause of this? Where should I begin fixing this?