Why Java for HEP Computing?

• Previous generation of experiments used Fortran + Data Management System (== Jazelle, Zebra, BOS)

• Solves Three Problems

  • Ability to Represent Complex Data Structures
  • Persistence (i.e. read in and write out complex structures)
  • Run time access to named data in structures (for analysis)

• Now time has marched on and modern experiments use C++

  • Represent Complex Data
  • Persistence
  • Run time access to data
  • Still need to build (or buy and deploy) data management system (e.g. Root, Objectivity)

• Java

  • Represent Complex Data
  • Persistence (serialization)
  • Run time access to data (reflection)
  • support built-in to language

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