Runtime.getRuntime().exec("sh export LC_ALL=C") fails!!!!!!!!!!

Hi,

I want to export the LC_ALL variable from Java to set the locale to C instead of other locales.

The command i want to run in HP-UX console is
"export LC_ALL=C"

I tried to execute the above command from a java program, but it did not give any error messages.But the locale is not changed to C.

import java.io.DataInputStream; import java.io.IOException; public class Execute { public static void main(String[] args) { Execute ex = new Execute(); ex.execute("sh export LC_ALL=C") ; } public static String execute(String string) { Process p; String s = null; try { p = Runtime.getRuntime().exec(string); DataInputStream in = new DataInputStream(p.getInputStream()); while ( (s=in.readLine()) != null){ System.out.println(s); } } catch (IOException e) { e.printStackTrace(); } return s; } }
Any input on this problem will greatly help me!!!

Hi,

Welcome to JavaRanch!

The bash command "export X=Y" sets the variable X in the shell where it's called, and further, makes it available to all other processes started from that shell. By executing this command in a shell from Java, you're defining the variable in a shell that executes just this one command and then exits. So whereas the command works, it doesn't do anything!

There's no way for a child process to add something to its parent's environment. Why do you want to do this from a Java program?

Hi
Thanks for your valuable suggestion.

My problem is

I am using JNI for writing logs.
When the locale is set to ja_JP.eucJP, JNI call for writing a syserrlog is printing some japanese characters instead of "Sep" in Timestamp.

If I run a standalone C program to print the date, it is printing in english though the locale is set to ja_JP.eucJP.

When you call the same C function to print the date through JNI, it is printing some junk chars for "Sep".So i want to change the locale "C" from my java program.

I tried Locale.setDefaultLocale(Locale.English)...but still my JNI call is printing some junk chars for "Sep". So i tried by changing the LC_ALL from java program with exec().

Java Code:
import java.util.*; class Logger { static { System.loadLibrary("Logger"); } private native void logSysErr(); public static void main(String[] args) { Locale.setDefault(Locale.ENGLISH); new Logger().logSysErr(); } }

C Code:
#include <jni.h> #include <stdio.h> #include <time.h> #include <string.h> #include <locale.h> #include <stdlib.h> #include "Logger.h" JNIEXPORT void JNICALL Java_Logger_logSysErr(JNIEnv *env, jobject obj) { printf("Logging.....................................\n"); struct tm *ptr; time_t tm; char str[90]; tm = time(NULL); ptr = localtime(&tm); strftime(str ,130 , "%b %B %h %d %H:%M:%S",ptr); printf("%s \n",str); return; }

Use the standard C library "setlocale()" function in your native code.

Thanks.
I have tried and it is working fine though the Locale is set to ja_JP.eucJP. But i want to do that from java. Is it possible?...Because, my native methods are shared my many applications.

Originally posted by Manimekala Velauthyam:
Thanks.
I have tried and it is working fine though the Locale is set to ja_JP.eucJP. But i want to do that from java. Is it possible?

Sure. Write another native method!

As per my codebase,writing one more native method will also cause problem,Is there any way to solve this problem in java itself?..

Why would writing another native method cause a problem? Can you create another class called "LocaleSetter" to hold this native method, and just use it in this one application?

But no, I don't believe there's any other way to accomplish what you want.

Hi,

I dropped the idea of doing that in java and I fixed that issue by keeping one more JNI call to set the Locale.

Thank you so much for spending your valuable time in this issue....
Timely Help...Thanks.