Bruce Eckel's Thinking in Java Contents | Prev | Next

What you’ve seen in this appendix are the most common techniques to call non-Java code from a Java application. Each technique has its pros and cons, but currently the major problem is that not all of these features are available on all JVMs, so a Java program that calls native methods on a specific platform might not work on a different platform with a different JVM.

Sun’s JNI is flexible, reasonably simple (although it requires a lot of control over the JVM internals), powerful, and it’s available on most JVMs, but not all. Microsoft, at the time of this writing, does not support JNI, but offers J/Direct, a simple way to call Win32 DLL functions, and RNI, which is designed for high-performance code but requires a good understanding of the JVM internals. Microsoft also offers its proprietary Java/COM integration feature, which is powerful and makes Java an interesting language for writing COM servers and clients. J/Direct, RNI, and Java/COM integration are supported only by the Microsoft compiler and JVM.

Finally, we took a look at CORBA, which allows your Java objects to talk to other objects regardless of their physical location and implementation language. CORBA is different from the techniques above because it is not integrated with the Java language, but instead uses third-party integration technology and requires that you buy a third-party ORB. CORBA is an interesting and general solution, but it might not be the best approach if you just want to make calls into the operating system.


  • There are no comments yet. Be the first to comment!

Leave a Comment
  • Your email address will not be published. All fields are required.

Top White Papers and Webcasts

  • Anthony Christie, the Chief Marketing Officer for Level Communications, is responsible for customer experience, worldwide marketing and product management. In this informative asset, he shares his insights into why a private network connection to cloud-bases applications is the right decision for your enterprise. Download now to find out more.

  • Enterprises are increasingly looking to platform as a service (PaaS) to lower their costs and speed their time to market for new applications. Developing, deploying, and managing applications in the cloud eliminates the time and expense of managing a physical infrastructure to support them. PaaS offerings must deliver additional long-term benefits, such as a lower total cost of ownership (TCO), rapid scalability, and ease of integration, all while providing robust security and availability. This report …

Most Popular Programming Stories

More for Developers

RSS Feeds

Thanks for your registration, follow us on our social networks to keep up-to-date