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How can I expose constant values in MVEL?
public static final String PRODUCT_NAME;

"Thanks for using " + PRODUCT_NAME

ParserContext ctx = ParserContext.create();
ctx.addImport(YourClass.class);

String expr = "YourClass.PRODUCT_NAME";
Serializable compiled = MVEL.compileExpreasion(expr, ctx);
Object result = MVEL.executeExpression(compiled);

public static final String PRODUCT_NAME = "My cool product";
public static final String getProductName() {
   return PRODUCT_NAME;
}

public class Product{
   public static final String PRODUCT_NAME = "TEST";
}

import org.sample.Product;

rule "Test"
    no-loop true
    lock-on-active true
    when
       eval(true);
    then
        System.out.println(Product.PRODUCT_NAME); #prints TEST

  end