How do I compile my Java directly to machine code?

Let's say I'm making an application that isn't going to be run from the internet, so I wish to compile it directly to Windows (or UNIX or whatever) so that it runs faster. I would like to compile java code to machine code, not to byte code. Is there any way to do this?

I'd not develop such an application in java to be frank. In any case there are several exe generators available (example zerog). But they mandate you have JRE installed on the machine where you are going to run your exe, else your exe would comtain jre in which case he size would be enormous. Either way you are a loser.

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How do I compile my Java project?

How do I compile my Java project? The "Build" option is missing from the right-click menu of my Project Explorer and I can't find a compile button.

On 08/05/2015 12:42 PM, Chris Wilkinson wrote:
> How do I compile my Java project? The "Build" option is missing from
> the right-click menu of my Project Explorer and I can't find a compile
> button.
Examine the Project menu. You'll see that, by default, Build
Automatically is checked. Each time you make a change to a Java file,
Eclipse rebuilds it into a .class file. To force the entire project to
be rebuilt, whether it needs it or not, select Project -> Clean.
Is this what you're looking for?

How to remotly run a Java Program on machine B from machine A.

Hi all,
I would like to start a JVM/java program from machine A onto machine B (windows plateform). Machine B could be running at another location so where in the lan/intranet.
OR
I would like to be able to start the process(GUI application) on machine B using code running on machine A.
Has anybody ever done somthing like this? Any help will be greatly appreciated.
Kind regards,
Suleman.
[email protected]

Machine B would have to be "listening" for program requests from Machine A.
So, on machine B you could have
a) corba server
b) rmi server
c) program listening on a socket for messages
d) servlet running on a web server
regards,
Owen

How do I compile a java file in eclipse

Hi,
I have just installed eclipse and added a plugin for tomcat.
I created a new tomcat project and have been trying out several jsp files. Everything nice and dandy.
Now there is a bean in the tutorial that I am doing. So I use the context menu, new->class.
A file is created in the src folder. I copied the source code from the tutorial in it.
Now I have been looking everywhere but can not find a menu option that lets me compile it.
How does that work. I hope this is the right forum for such basic questions.
Thank you very much.

As far as I know, the java code is compiled in Eclipse as soon as you save it. i.e. press CTRL+SHIFT+s
as far as the build is concerned, in case you have a build file where you specify how to make a jar file, the location the jsr file is to be placed, only then you have to build the project. However again, as far as just simple compile is concerned as soon as you save the files are compiled. And show you the errors if any in the tasks window.

How can I compile BaseResource.java on iAS 6.0 SP4 on Solaris 8?

I'm trying to upgrade our application server to SP4 but I can't until I am able to compile a couple hundred AppLogics in SP4. I posted about this last week but got no answer. Here's a simple compile that succeeds in SP2 and fails in SP4 :
wwwtest% /export/home/iplanet/ias6/ias/usr/java/bin/javac -classpath .:/export/home/iplanet/ias6/ias/classes/java/nab25.jar:/export/home/iplanet/ias6/ias/classes/java/kfcjdk11.jar TBG/BaseResource.java
TBG/BaseResource.java:0: The method void setSessionTimeout(int) declared in class com.netscape.server.nas.BaseResource cannot override the method of the same signature declared in interface com.kivasoft.ISession2. They must have the same return type.
package TBG;
^
1 error
Here's the problem. kfcjdk11.jar was changed btwn
SP2 and SP4 but nab25.jar wasn't. com.kivasoft.ISession2.setSessionTimeout (in kfcjdk11.jar) changed but com.netscape.server.nas.BaseResource (in nab25.jar) wasn't updated to conform to the new interface declaration. The old nab25.jar is included in the SP4 distribution but it's useless. Any recommendations on how to resolve this issue?

Hi,
Greetings to you. I'm interested to know the following.
1. Are you able to run cxs engine ?. This means, just start the cxs engine
without any errors before invoking any components with app server.
2. Does cxs engine crash after you start and kas keeps restarting the cxs
engine.
Thanks & Regards
Raj

How can speed up my java program ? native code compilation ?

Hello everyone, I know that there are so many post related to compiling to native code.
My situation is that I wrote a little program that gets executed upto 50 times per second. This program basically gets a set of parameters and after validating them, they get inserted into a SQL Server 2000 table.
I need this program to be faster ?
I was thinking of writting this again on c++ but I don't know how to do it and I must do it myself.
Thanks for you time,
Sincerly Fabian.

When we get 1500 traps in one second, the CPU
utilization gets overloaded and the server crashes.C++ will be slightly faster if you are truly CPU-bound, assembly will be faster still. However, at some point nothing will be able to keep up. So the real question is whether Java provides enough development-level support and cross-platform capability to justify its slightly slower performance.
Some things to think about:
1) Are you running multiple threads to process incoming messages? You might be better off buffering the messages and processing them on a single or pooled thread. If the message traffic is truly bursty, and you don't need real-time response (which is illusory anyway), this should reduce your load.
2) To echo another poster, are you really invoking a program for each message? Can you run that operation within the same JVM? There's a significant cost for each program start, as well as for context switches.
3) You mentioned that you're writing to a database. Can you batch the writes? Individual writes result in more network round-trips, as well as more context switches.

Does anybody here know how I can compile my java programs?

I downloaded j2se 1.4.0 and j2se 1.4.1 and for some reason I can't the javac command in the bin directory. There is a command called javaw but I don't know what it does. can anyone help me?

Please Check whether JRE is installed with the SDK set up. If you are running Windows OS then edit the "AUTOEXEC.BAT" file so that all the commands will run.
Do this ---
C:\>edit autoexec.bat
and at the end of the file add ---
SET PATH=%PATH%;drive-name\java-installation folder.
ex
SET PATH=%PATH%;C:\JDK1.4\BIN;
save and exit.
It should work.
javaw is used to run executable jar files.

How do I compile my Swing project to native code?

I love to use the Java programming language. I want to create an application for Windows that can run without the JVM, JRE or any other runtime environment. I want to write my application in Java (because of the outstanding language structure) and be able to distribute it like any other application that can be downloaded from the internet without having to supply several megabytes of support files.
I have been looking around for native compilers, found JOVE, Excelsior JET etc., but they all seems to require some kind of runtime environment on the target computer. Can it be that hard to make a Java compiler that extracts what it needs from used libraries and puts it together with application code to a single program .exe file. Just the way most programming language compilers do! I don't care if the concept of being able to run applications on different OS is disposed. Sure, I could use another language, but I just happen to like Java!
Could anyone suggest a compiler that does this? I would apprieciate it alot! Thanks

Hello Swing components could easily be translated to IBM SWT, I found IBM SWT easy to use and eclipse platform just a perfect development tool. Excelsior then allows you to produce a fully compiled version of classes, given that they do not contain SWT/Swing.
I hope you will find this information useful.
P.S.
Anyone knows whether JRE-free applications could contain JDBC:ODBC connectivity? My application work fine, everything is fully compiled BUT JDBC.

How do I compile Wine for my 64bit machine?

Hello,
How would I go about doing that?

I had them installed before and just ran pacman -S base-devel to reinstall, here's the output of pacman -Qg base-devel:
base-devel autoconf
base-devel automake
base-devel bin86
base-devel bison
base-devel ed
base-devel fakeroot
base-devel flex
base-devel gcc
base-devel libtool
base-devel m4
base-devel make
base-devel patch
base-devel pkg-config
I am still not able to complete the build. If it matters I also chrooted in with linux32 as a wrapper(If that's the correct term).
Last edited by Jordanlw (2010-07-27 18:51:06)

How to compile a java file Dynamically !!!!

Hi all
The problem is
I have a dynamically created java file ,and i want to compile that file dynamically itself. The file name is stored in a string,
I am using ECLIPSE editor..
How do i compile this java file (which is stored in a string) dynamically?
Pls help me, already wasted a lot of time,
Thanks in advance

In every Tutorial regarding Dynamic Compilation,
It is told to import javax.tools.*..
But i cannot find this package
I am using jdk1.4, is this the reason?
Actually the following packages are needed fro this
import javax.tools.DiagnosticCollector;
import javax.tools.JavaCompiler;
import javax.tools.JavaFileObject;
import javax.tools.StandardJavaFileManager;
import javax.tools.ToolProvider;
but i cant finad any..!!!
Please help me

Compiling multiple java files present in different packages simultaneously

Hi,
I have multiple java files which are present in different folders.
In some cases, files are importing classes from other packages i.e. some kind of inter-dependency
How do I compile these java files simultaneously?
Any help would be highly appreciated.

Pawan_Anand wrote:
Hi,
I have multiple java files which are present in different folders.
In some cases, files are importing classes from other packages i.e. some kind of inter-dependency
How do I compile these java files simultaneously?
Is it circular?
Thus the dependency is A => B => C => A?

How to terminate a java thread from c++ code?

Hi,
I made a screensaver which loads a jvm, forks a thread running a java class, wait until user's action(i.e. mouse move/click keyboard input), then terminate the java thread.
However, I met a problem, How to terminate a running java thread from c++ code?
Here is my code, but it does not work: (even after the terminate is called, jvm throws an error)
JNIEnv* env;
JavaVM* jvm;
HANDLE hThread; //handle for the startThread
unsigned __stdcall startThread(void *arg)
     jclass cls;
     jmethodID mainId;
     jint          res;
     int threadNum = (int)arg;
     res = jvm->AttachCurrentThread((void**)&env, NULL);
cls = env->FindClass( MAIN_CLASS);
     mainId = env->GetStaticMethodID(cls, "main", "([Ljava/lang/String;)V");
     // setup the parameters to pass to main()
     jstring str;
     jobjectArray args;
     int i=0;
     args = env->NewObjectArray(1, env->FindClass("java/lang/String"), 0); //only one input parameters
     str = env->NewStringUTF("localhost");
     env->SetObjectArrayElement(args, 0, str);
     env->CallStaticVoidMethod(cls, mainId, args); // call main()
     if (env->ExceptionOccurred()) {
               env->ExceptionDescribe();
     return TRUE;
Here is the main method:
First create the jvm and load the thread. then tries to terminate the thread, but failed here
switch (msg)
{ case WM_CREATE:
          JavaVMOption options[NUMBEROFOPTIONS];
          JavaVMInitArgs vmargs;
          jint rc;
          vmargs.version = JNI_VERSION_1_4; /* version 1.4 */
          vmargs.options = options;
          vmargs.nOptions = NUMBEROFOPTIONS;
          vmargs.ignoreUnrecognized = JNI_FALSE;
          rc=JNI_CreateJavaVM( &jvm, (void **)&env, &vmargs ); /* create JVM */
          /* We pass the thread number as the argument to the invoked thread */
          unsigned int threadId = -1;
          // to initialize a thread-safe C runtime library
          hThread = (HANDLE)_beginthreadex(NULL, 0, &startThread, NULL, 0, &threadId );
} break;
case (WM_DESTROY):
          CloseHandle( hThread );
          jvm->DestroyJavaVM(); /* kill JVM */
          Debug("Destroy Java Virtual Machine\n");
}break;
Note, after the thread "startThread" runs, it has an infinite loop and will not terminate, until the user clicks to terminate.(I didn't call jvm->DetachCurrentThread();_endthreadex(0); in the "startThread" because the java thread will not terminate by itself)
Thus, the only way to terminate the thread is to call closehandle(hthread) in the main thread, which may cause jvm to throw an error.
Do you know how to terminate a java thread safely???
Thanks a lot

Assuming that your java thread is in a loop of some kind. Such as
int i=1; /* I tried using a boolean, I just could not get my C++ env, to change this value. So i decided to use an int */
run {
while(i)
isdfjsdfj
void seti()
i=0
So, B/4, i call destroyVM in my C++ code, i call this seti(). so the loop terminates, therefore my thread finishes executing and ends.
Hope this helps
tola.

PixelBender in Flash no longer compiles to machine code?

It appears that the latest version of Flash (11.7.700.232 / 11.8.800.94) has removed support for Just-In-Time compilation of PixelBender shader programs into machine code. For example, you can compare the FPS of this animation:
http://spinningowl.com/flash_experiments/PBTest_CPU.html?placeValuesBeforeTB_=savedValues& TB_iframe=true&height=660&width=650&modal=false
with the latest Flash vs. any previous versions, and the FPS on the latest Flash runs at nearly a fivefold slowdown. I've verified that the PixelBender program is no longer running directly via machine code, but is instead interpreted by the runtime.
Is there something different that has to be set via the wmode parameter or some other HTML parameter to maintain the old behavior? Or has JIT support been dropped entirely from PixelBender?

Here is an email I received about this issue from an Adobe engineer:
...this was a permanent change that was made to address a security issue with the player. In our decision making we believed that this feature was seldom used and that while falling back to the interpreter would be slower, since the feature was designed 5 years ago, current desktop system speeds should help compensate for the decreased performance. We also believed that performance should be acceptable on mobile for small filtered areas (it's been implemented in interpreted mode on mobile from the beginning.)
We are still gathering feedback from customers on [this] bug report and there are internal discussions about the ramifications of this change.
So it looks as though this change is not going to be reversed any time soon, given that there are security implications.
The only workaround is to reduce the dimensions of the bitmapData object that the Pixel Bender shader uses. This will improve frame rate performance, but will of course mean images will be pixelated if the bitmapData is then enlarged to its previous size.

How to compile a java file which is in memory?

how to compile a java file which is in memory?
such as:
String s="class MyClass {....}";
how to compile the string?
thx

come on ...That was a perfectly valid solution.
Do you know how to call the sun.* compiler? If not then search the forums for it. If that interface still exists (which it might not in newer versions) you then will create a string stream from your class and pass it to that.

How to compile other java files and run them from my own programs?

I'm developing a unit testing tool for AspectJ, which can originally generate the stubs for aspect unit to be tested. All these stubs are java files. After generation of stubs, how can I program the code to compile this unit together with these stubs, i.e. how can I put the functionality of compilation and run, e.g. command "javac *.java" and "java *", into my own code.
Hope you can understand what I mean.
Thank you in advance.

When I use Runtime.getRuntime().exec(command) for executing the AspectJ compile command "ajc", "IOException createProcess error=2" always occurs, while it is ok for Java comiple command "javac".
Why this happens when I use Runtime.getRuntime().exec("ajc Hello.java Test.aj")? Is it the reason that Runtime.exec(String) may not support any command in DOS?
(ajc is the compile command for the java file and aj file.)
Thank you in advance.

How do I compile my Java directly to machine code?

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