Question

Are there any restrictions for using coherence.jar without any license?

coherence.jar is open for downloading without any fee.

Answer 1

You can use it for development purposes. Any other purpose means purchasing a license. On the download page is a link to the license agreement that states:

You may not:

• use the programs for your own internal data processing or for any
  commercial or production purposes, or
  use the programs for any purpose
  except the development of your
  application;
• use the application you develop with the programs for any internal data
  processing or commercial or production
  purposes without securing an
  appropriate license from us;
• continue to develop your application after you have used it for any
  internal data processing, commercial
  or production purpose without securing
  an appropriate license from us, or an
  Oracle reseller;
• remove or modify any program markings or any notice of our
  proprietary rights;
• make the programs available in any manner to any third party;
• use the programs to provide third party training;
• assign this agreement or give or transfer the programs or an interest
  in them to another individual or
  entity; – cause or permit reverse
  engineering (unless required by law
  for interoperability), disassembly or
  decompilation of the programs;
• disclose results of any program benchmark tests without our prior
  consent.

The first two points are the most relevant.