FIX object model in Java?

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Imported from previous forum

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Does anyone know of an existing FIX object model in Java?

I would find it very useful to have a Java class for each FIX message type and public static final definitions with descriptive names of the valid values for the fields, such as

public class NewOrderSingle extends FixMessage
…

// Valid values for OrdStatus (FIX tag #39)
public static final char ORD_STATUS_NEW = ‘0’;
public static final char ORD_STATUS_PARTIALLY_FILLED = ‘1’;