Your users want to customize formulas. They know Excel or OpenOffice.

// Compile price finding factory and strategy implementation from spreadsheet: EngineBuilder builder = SpreadsheetCompiler.newEngineBuilder(); builder.loadSpreadsheet( new File( PATH, "CustomPriceFormula.xls" ) ); builder.setFactoryClass( PriceFinderFactory.class ); builder.bindAllByName(); Engine engine = builder.compile(); PriceFinderFactory factory = (PriceFinderFactory) engine.getComputationFactory();

// Use it to compute a line item price: LineItem item = getCurrentLineItem(); PriceFinder priceFinder = factory.newInstance( item ); BigDecimal price = priceFinder.getPrice();

Compile parametrized spreadsheets directly to bytecode.

* No need to have Excel, OpenOffice, or a JDK installed.
* Native speed, thread safe execution.
* Bind directly to your computation strategy interfaces.
* Using double, or BigDecimal for financial applications.
* Available under the GPL and commercially (details).