I’m trying to unmarshal a knowledge session that has been persisted to file, but I get the following exception:

Stack Trace:

com.google.protobuf.InvalidProtocolBufferException: Protocol message was too large. May be malicious. Use CodedInputStream.setSizeLimit() to increase the size limit.

    at com.google.protobuf.InvalidProtocolBufferException.sizeLimitExceeded:89

    at com.google.protobuf.CodedInputStream.refillBuffer:720

    at com.google.protobuf.CodedInputStream.isAtEnd:666

    at com.google.protobuf.CodedInputStream.readTag:99

    at org.drools.marshalling.impl.ProtobufMessages$Header$Builder.mergeFrom:967

    at org.drools.marshalling.impl.ProtobufMessages$Header$Builder.mergeFrom:773

    at com.google.protobuf.AbstractMessageLite$Builder.mergeFrom:212

    at com.google.protobuf.AbstractMessage$Builder.mergeFrom:746

    at org.drools.marshalling.impl.ProtobufMessages$Header.parseFrom:724

    at org.drools.marshalling.impl.PersisterHelper.readFromStreamWithHeader:234

    at org.drools.marshalling.impl.ProtobufInputMarshaller.loadAndParseSession:217

    at org.drools.marshalling.impl.ProtobufInputMarshaller.readSession:107

    at org.drools.marshalling.impl.ProtobufMarshaller.unmarshall:143

The session consists of >1M facts, and the file is ~167 MB in size.

While Googling, I stumbled upon the recommendation to run CodedInputStream.resetSizeCounter() inbetween deserializing messages. Is this a fix that could be implemented in Drools?

Is there any way of configuring or parameterizing the unmarshalling size limit used by Drools?