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JNIWrapper General Questions and Answers
Get answers to commonly asked general questions about JNIWrapper. If you don’t find the answer, send us your question using the support request form, and we will add it to this FAQ after answering you.
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What is JNIWrapper?
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JNIWrapper is a library that allows calling native functions directly from Java code.
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Java provides so many features - why would I need native functions?
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Some platform-dependent features, such as Windows registry, are not accessible through the Java API. You may also have some legacy software available in the form of a native library that you need to access. JNIWrapper makes it possible.
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What Java versions are supported?
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Officially, J2SE versions 1.3.x, 1.4.x and Java 5 are supported. We develop and test JNIWrapper using these versions of Java. However, JNIWrapper for Linux requires JRE 1.4.x. Why?
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Will a program that uses JNIWrapper run on any platform?
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It depends on how you are planning to use JNIWrapper and for what purposes. Essentially, a program that uses Java Native Interface (JNI) is not a true cross-platform one, because it employs platform-dependent native code. JNIWrapper is no exception. Currently, there are Windows, Mac OS and Linux versions of JNIWrapper, therefore the code that uses JNIWrapper can run on Windows, Windowsx64, Mac OS X and Linux platforms.
In your program, you can have a platform detection logic that would allow doing things differently depending on a platform where your code is running. For example, you may want your program to display a tray icon, when running on Windows, but under other platforms and windowing systems, your program would behave differently. As a result, your program will run on multiple platforms.
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What about support for other platforms apart from Win32, Mac OS X and Linux?
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We are planning to add support for more platforms in the future. We have in mind more Unix ports, like Solaris, HP-UX, etc. But terms and availability of these ports will mostly depend on user feedback that we receive.
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What is your upgrade policy? [updated]
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When you buy a license for JNIWrapper or any other TeamDev product, you are guaranteed to get free upgrades for all versions with the same major version number. That is, if you bought JNIWrapper version 2.0, you can get free upgrades for all 2.x versions. The same applies to 3.x. version upgrades. Upgrading from 2.x to 3.x version requires payment. However, you can upgrade to the next major version at no cost within 60 days from the date of purchase of any product version.
To upgrade your version of JNIWrapper, please use the online upgrade form on the Download or Purchase pages.
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I have JNIWrapper for Windows. Are there any discounts if I want to buy JNIWrapper for Linux? [new]
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Yes. We offer our customers a 15% discount for all TeamDev products. So if, for example, you purchased JNIWrapper, you can get any other of our products at a discount price using personal coupon code. You will receive this coupon code in the e-mail message along with your purchased product license(s). In order to buy at a discount, simply enter your personal coupon code in the online order form for the product you want.
If, for some reason, you don’t have your personal coupon code or have lost it, please contact our sales department at sales@teamdev.com.
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I want to buy multiple licenses for JNIWrapper. Do you provide any volume discounts? [new]
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Yes. If you wish to purchase a large number of licenses, you can do so at volume discounts. Price breaks start at five licenses, and the more you buy the bigger discounts you receive. To learn about volume price quotation, please contact our sales department at sales@teamdev.com.
What’s more, if you are already our customer, you can save even more when making a volume purchase using our 15% customer discount.
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We are considering an update of JNIWrapper 2.9.5 to 3.0, but it seems that the codegen utility has changed completely. Was the old functionality that generated Java wrappers removed? [new]
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All COM-related functionality is available as a separate product called ComfyJ.
The Codegen.bat found in JNIWrapper 3.0 distribution is designed for creating wrappers for C-types like structures, unions, callbacks etc. And the 'old' version of code generation utility can be found in ComfyJ 2.0 distribution.
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We have upgraded to JNIWrapper 3.0. Can we no longer work with our OLE Adobe Acrobat Reader (which we generated with JNIWrapper 2.9.5) using JNIWrapper 3.0? Should we purchase a license for ComfyJ 2.0 as well? [updated]
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Yes, in order to use COM functionality you will need ComfyJ 2.0 library.
However, being our customer entitles you to purchase ComfyJ at a 15% discount.
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Do you use JNIWrapper yourself?
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Yes. We successfully used JNIWrapper technology in several projects both for accessing platform-specific features and for legacy code integration. It appeared to be so useful to us that we decided to offer it as a commercial product. Currently, we continue using JNIWrapper and have big plans regarding its further development.
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