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    <p>I basically see three options for calling VBA code in Excel from a Java application:</p> <ol> <li><p><strong>Java COM Bridge</strong>: There are several tools available that allow you to call COM or COM Automation components from Java. Excel is such a component. I know of <a href="http://sourceforge.net/projects/jacob-project/" rel="noreferrer">Jacob</a> and <a href="http://sourceforge.net/projects/jcom/" rel="noreferrer">JCom</a>, but there might more such tools available.</p></li> <li><p><strong>Java / VBScript / COM Automation</strong>: Since you obviously don't need to pass data to the VBA code, the simplest solution is probably to write a VBScript that starts Excel, opens the document, calls the macro and closes Excel. This script is started from Java with <code>Runtime.getRuntime().exec("cmd /c start script.vbs");</code></p></li> <li><p><strong>JNI</strong>: You could write a specific DLL for your applications. It implements the JNI interface so it can be called from Java. And its implementation uses COM calls to work with Excel. Such a DLL is best written with VisualStudio and it's support for C++ to call COM objects.</p></li> </ol> <p>Whatever your solution will be, you basically want to execute the following commands on Excel automation interface (sample in VBScript):</p> <pre><code>Dim xl Set xl = CreateObject("Excel.Application") xl.Workbooks.Open ("workbook.xlsx") xl.Application.Run "MyMacro" xl.Application.Quit Set xl = Nothing </code></pre> <p>You cannot compile VBA code into a DLL. There exists no tool for that (in contrast to the full Visual Basic).</p> <p>I hope this answer is helpful even though I didn't understand what you mean by: <em>"we want to assume that the user of the Java application does not necessarily have immediate access to Excel, but is operating on a Windows machine."</em></p>
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    1. COSounds like a great start, thank you. I think I'll do this: Create a COM object that replicates the existing VBA. Then, create a dll that calls the COM functions, and have the Java load the dll, and call it's functions.
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    2. COClarification of your quote of mine: We assume that the client is on a Windows machine, but that none of the office suite (including Excel) is installed. Therefore, if it requires opening Excel to do so, it is not a viable solution.
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    3. CONow I'm confused... How did you plan to run VBA code without Excel installed? And why would you want to write a COM object (in what language anyway?) and then a wrapper (in C++ or whatever) and finally call it from Java if you have to rewrite the VBA code anyway? Why not make it many times simpler and rewrite it in Java?
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