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Java Forum / General / May 2006JRE
Who can tell me how can i run java programs with very small JRE??? My JRE is 50 MB >Who can tell me how can i run java programs with very small JRE??? My >JRE is 50 MB You mean you want a cell phone sized Java? The smaller versions don't have the some class libraries available, so you can't run standard desktop apps on them.  SignatureCanadian Mind Products, Roedy Green. http://mindprod.com Java custom programming, consulting and coaching. I mean that i want to invoke the JVM having a very small JRE. say I want to make a game in java and distibute it with this JRE. >I mean that i want to invoke the JVM having a very small JRE. say I > want to make a game in java and distibute it with this JRE. You may be interested in compiling natively. Consumers in general are not concerned or aware of memory usage and those who are usually have a lot of ram ;) -- LTP :) A few years ago I use to clean the JRE before packaging it for deployment. Although at that time there were not too many files you could get rid of and the JRE remained quite large. Time has changed, maybe Sun has made some good changes, but I doubt it. If you look in the documentation at the root of the JRE they document every file which is mandatory and which is optional. You may want to take a look at deploying your game with JavaStart or JavaWebStart (or something like that). Good luck, Jeach! >A few years ago I use to clean the JRE before packaging it for > deployment. [quoted text clipped - 11 lines] > > Jeach! Wait . . . to the OP: Are you trying to minimize installation size, or memory while in use. If you are concerned about the actual disk usage, or space on a DVD - I think you needn't concern yourself. If people have no already installed the JRE - they would appreciate having the whole thing likely. -- LTP :) I want to create an *.exe written in c++ but which uses Java. For this i have to use JNI and also the JRE. But i want the final package to be as small as posible. So i need the smaller JRE i can get. Who can give me links or sugestive ideas? > I want to create an *.exe written in c++ but which uses Java. For this > i have to use JNI and also the JRE. But i want the final package to be > as small as posible. So i need the smaller JRE i can get. Who can give > me links or sugestive ideas? Assuming that you are targeting modern desktop or server platforms... Don't use JNI. Write one program in C++ and another in Java, and let the two communicate via IPC. Don't bundle the JRE with your program: use the existing JRE on the target platform. (I'm always annoyed when an application bundles its own JRE, rather than using the perfectly serviceable one I have already installed.) Can you be more specific? An example would be much more helpfull. Thanks! How can a program written in C++ comunicate with one written in Java via IPC? > Can you be more specific? An example would be much more helpfull. > Thanks! How can a program written in C++ comunicate with one written in > Java via IPC? Sockets. See: http://www.cs.cmu.edu/~IPC/ Signaturemartin@ | Martin Gregorie gregorie. | Essex, UK org | Can someone give me an example of a program written in java and transformed *.exe? I could do this via JNI, invokation API. But it requires JRE. and it is too big. So I need either another method of doing this or another JRE, smaller one. >Can someone give me an example of a program written in java and >transformed *.exe? see http://mindprod.com/jgloss/nativecompiler.html SignatureCanadian Mind Products, Roedy Green. http://mindprod.com Java custom programming, consulting and coaching. > Can someone give me an example of a program written in java and > transformed *.exe? I could do this via JNI, invokation API. But it > requires JRE. and it is too big. So I need either another method of > doing this or another JRE, smaller one. If you compile your Java code to .class files, then you'll need a JVM to run those files. There are "alternative JVMs", but they probably won't solve your problem, as the bulk of the size of the JRE is the class files, not the JRE, and I believe Sun has some licensing rules that say you can't make the JRE smaller by omitting the stuff you don't need. The advice you received earlier about not bundling the JRE was telling you to tell your users to download and install the JRE themselves. If you don't want to do that, you'll have to compile your Java code to executables. Try gcj (http://gcc.gnu.org/java/index.html) or Excelsior Jet (http://www.excelsior-usa.com/jet.html). - Oliver > Can you be more specific? An example would be much more helpfull. > Thanks! How can a program written in C++ comunicate with one written in > Java via IPC? IPC stands for Inter-Process Communication, and can refer to any technique multiple processes (or according to Wikipedia, multiple threads) use to talk with each other. You might use sockets or shared memory, but I find that plain old pipes are usually powerful enough for my needs. Here's some sample code: http://schwabcenter.com/cljp/ In this example, the Java code calls a native executable, and the two process communicate by text messages across ordinary I/O streams. Nice and simple. Free MagazinesGet these publications absolutely FREE for up to 12 months. There are no hidden fees and no obligation. Simply choose a title, complete the application form and submit it. Read more ...
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