Unzip it and you will find several directories, including the launcher directory. In your SDK installation directory ( C:\j2sdk1.4.2_04 on my machine), there is a file named src.zip.
Of course, this is not the complete source code to the JVM, but the source code for the launcher. It's a little-known fact that the source code to java.exe and javaw.exe are included in your Sun SDK distribution. Again, the performance difference is minor, but it might still be worth it to you to eliminate every extra bit of overhead. Performance compared to an executable jar file distribution such as JEdit should also be better because startup parameters are compiled into the launcher vs. The amount of time savings should be negligible, but given the slow startup time of the JVM, shaving a few milliseconds off the application start might be worth it to you. A native launcher is faster than a batch-file launcher because interpreting batch files is slower than running native C code. This is the weakest of the three arguments, but worth mentioning for those of you that are obsessed with performance (like the author). exe name will appear in the list as the process name. When you are looking for the process, you don't have to guess which java.exe or javaw.exe is the process for your app. The technique described in this article requires that the application include a specific JVM with your application.Īnother part of deployment is troubleshooting.
Regardless of the level of sophistication you choose, you'll be faced with another question: Do I use the JVM (Java Virtual Machine) that is already installed on the machine? This question will be decided by size of deployment, version sensitivity of your application, and licensing considerations. Options for deployment range from fancy automated installers, to executable jar files, to "copy and run". Again, this is avoided by using a native launcher and including an icon in the. The second common problem is that a custom icon is not provided. This has an additional benefit of hiding certain details about how your program is launched, such as the CLASSPATH and the " main()" class. A native launcher avoids this problem by providing a Windows. This is indicative of a batch file that is calling one of the default Java launchers ( java.exe or javaw.exe).
The first is that annoying command prompt windows pop up temporarily. Two common problems with typical Java applications are avoided by using a native launcher. Why? The reasons fall into three categories: Integration, Deployment and Performance: Integration But if you said that they all include a native launcher, you'd also be correct! They all include a native launcher for Windows.
What do IntelliJ Idea, Eclipse, and SmartCVS all have in common? If you said Java, you would be correct.
Improve Java Apps on Windows with a Native Launcherīy Dan Lewis, OCI Senior Software Engineer Improve Java Apps on Windows with a Native Launcher.