I tested JDBM2 which is really a great API to persist data directly in a tree- or hash-map. On the project site it is written that it does not support concurrent access. So my question is: Are there similar open source APIs for Java available which support concurrent read and write operations?
Thanks
I guess a basic feature the questions implies is inter-jvm communication? If that is the case, I have successfully used hazelcast.
See for example this question that although different has valuable information.