How to call a C program in java?

I would like to call a C program (which does not return anything back to the Java program) from a Java class? Or is there any simple example just to do such a task online?
Thanks.

two options:
1) Use JNI and call your C routines directly
2) Make an executable and call it using Runtime.exec()

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How to Call abap functn/program from java layer

Hi all,
I have to develop a program which has to call abap function/program from java side or how to call a abap program through java ..
pls send me related links or explanations.. dont send unrelated answers..
Regards,
Arivarasu S

Hi,
You mean accessing ABAP functions from J2EE perspective, then I think we can do this by using SAP Java Resource Adapter and also through webservices.
SAP Java Resource Adapter (SAP JRA) can be used as an add-on for the SAP JCo SAP JRA enables the implementation of standard interfaces from diverse J2EE servers to the SAP JCo in the SAP Web AS. The SAP JRA thus simplifies
communication with ABAP within heterogeneous J2EE landscapes.
Go through the following links which has Good documentation on how to achieve this
Accessing BAPIs Using the SAP Java Resource Adapter
[https://www.sdn.sap.com/irj/sdn/go/portal/prtroot/docs/library/uuid/ad09cd07-0a01-0010-93a9-933e247d3ba4]
Connectivity and Interoperability
[https://www.sdn.sap.com/irj/sdn/go/portal/prtroot/docs/library/uuid/326d82e5-0601-0010-fca4-9caf27b89c26]
Finally with WebServices. Accessing SAP Business Functions (ABAP) via Web Services
[https://www.sdn.sap.com/irj/sdn/go/portal/prtroot/docs/library/uuid/06adbf03-0a01-0010-f386-d8e45561a3c4]
Regards
Raghu

How to call a C program in java PACKAGE

am trying to call a method implemented in C from java.
I followed the instructions of sun.java.com tutorial for the simple example of HelloWorld. It works fine.
BUT, when I try to do the same in a package, I run into a lot of trouble. I did the following :
1. Created HelloWorld.java in a package GUI/ and compiled it
package GUI;
import java.io.*;
class HelloWorld {
public native void displayHelloWorld();
static {
System.loadLibrary("hello");
// Call native method through this from other classes
public void callinghello() {
callip();
public static void main(String[] args) {
new HelloWorld().displayHelloWorld();
2. javah -jni HelloWorld -- to create HelloWorld.h
3. wrote HelloWorldImp.c
4. g++ -Wall -shared -I/usr/lib/j2sdk1.3/include -I/usr/lib/j2sdk1.3/include/linux HelloWorldImp.c -o libhello.so
-- compiled and created .so file
5. Set the package directory in Classpath, path and LD_LIBRARY_PATH
6. When it is run java GUI.HelloWorld
I get this error
Exception in thread "main" java.lang.NoClassDefFoundError: OrionGUI/HelloWorld
Can anyone help me. If you have any links to how to call native methods in package, please let me know. Thanks.

GOT IT !!!
I had to change the name of the method in .h file generated by javah command. On doing
javac -d ../../classes HelloWorld.java
go to the ../../classes directory (where you have the class file) and do
javah HelloWorld
I got a HelloWorld.h file in which I had
JNIEXPORT void JNICALL Java_HelloWorld_display(JNIEnv *, jobject);
I added the package name too:
JNIEXPORT void JNICALL Java_GUI_HelloWorld_display(JNIEnv *, jobject);
The HelloWorldImp.c file should have the same name (ie with package) and be in the same directory(ie ../../classes)
compile and build the shared library to get "libhello.so" file
gcc -c -fPIC -I/usr/lib/j2sdk1.3/include -I/usr/lib/j2sdk1.3/include/linux HelloWorldImp.c
gives .o file
gcc -shared -o libhello.so HelloWorldImp.o
gives .so file
then run java with the command in my first message. It works.
Thanks for the reply "thedracle".

How to call a external program in java?

Help!!
Is there any method that can a java program can call a external program? For example execute a exe file.
Thanks.

Yes.
Runtime.getRuntime().exec("exactly what you would type at the command line");
But be aware that this is operating-system-specific and full of gotchas. When you run into one of them, come back to the forum and do a search, this is a frequent topic of discussion.

How to call a external program in java program

for example, if I want to execute internet explore or windows word in java program, how to do it?

http://java.sun.com/j2se/1.4.2/docs/api/java/lang/Runtime.html

How to call SAP Webservice in standalone java program

Hi,
In our Java application, we want to use the SAP Webservices. I dont know much about authentication mechanism used by SAP. Can any one please help me with any sample code how to Call SAP webservice in Standalone Jave Program. I searched alot on the web regarding this, but helpless. Please help me.
Thanks,
Mohan

Hi Mohan,
You need an account for the ES Workplace. I'm afraid this is not free, e.g. check [SAP NetWeaver, Composition Subscription|https://www.sdn.sap.com/irj/sdn/subscriptions/composition].
But I thought you wanted to play with a WSDL [you already had at hand|Sample code to access BAPI Web services from JAVA required;?

How do I call a C++ program from Java?

I've tried using Runtime.exec to call my C++ program from Java but I don't think I'm doing it correctly. Could someone explain how to properly use it? Here's what I'm trying (this is in an applet that is only going to be running on an intranet so only PCs in my LAN will be affected):
Runtime runtime=runtime.getRuntime();
Process proc =runtime.exec("mkdir C:\\Test");

What do you expect your operating system should do with a command "mkdir"? It doesn't understand this. "mkdir" is a shell command, so you need to execute the shell:
runtime.exec("cmd /c mkdir C:\\test");

How to call a VB application from Java

Hi,
does anybody know how to call a VB application from java.
Would appreciate if you can provide me with an example.
thanks

try exec()ing the cad program with the name of the file as a command line parameter...
Runtime.getRuntime().exec("CADProg.exe Test.prt");
i have no clue if this will work but it seems like it's worth a try.

Call a c program in java

i am trying to call a c program in java,can anyone tell me how ot do this using jni

That has nothing to do with JNI nor java.
However if you mean an executable, then the will be an OS call, specific to your OS, which allows you to run a process/application. That is the only way you can do it.

How to call the method from the java bean and pass it to JSP textbox

i'm quite new to java thats why i'm asking how to call a method in the java bean file and pass it to the JSP textbox. My projects are communicating JSP with C#. i had successfully created a C# client bean file for JSP. The whole process is to type something on the server(C# programming) and it would appear in the textbox.

your question doesn't provide much informartion. provide some other information and coding so that we could tell exactly what you are looking for?

Call visual prolog program from java

Hi friends,
is there someone help me to call ( run) prolog program from java.
i write a parser with Javacc parser generator and stored parsed information in prolog database and I want create some query in java that work in the prolog file.
how can i combine java and prolog programs. i used visual prolog.
Can someone help me?
Thanks you in advance.
yours sincerely,
ksu

Since visual prolog can produce dll's, you can use JNI:
http://java.sun.com/j2se/1.4.2/docs/guide/jni/index.html

How to call a .bat file from java code?

How to call a .bat file from java code? and how can i pass parameters to that .bat file?
Thanks in advance

thanks for ur reply
but still i am getting the same error.
I am trying to run a .bat file of together tool, my code looks like below
import java.lang.Runtime;
import java.lang.Process;
import java.io.File;
class SysCall{
     public static void main(String args[]){
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          try{
               System.out.println("Before batch is called");
               Process p=r.exec(cmd);
               System.out.println(" Exit value =" + p.exitValue());
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          catch(Exception e) {
               e.printStackTrace();
               System.out.println (e.toString());
I am getting the below exception
Before batch is called
java.lang.IllegalThreadStateException: process has not exited
at java.lang.Win32Process.exitValue(Native Method)
at SysCall.main(SysCall.java:17)
java.lang.IllegalThreadStateException: process has not exited

How to call the abap program in workflow

HI Exeprts,
I need to call one abap program in workflow.
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thanks &regards
ramesh

Dear Ramesh,
U can use REPORT business object.
Method : EXECUTE_2
Regards,
Sagar

How to create a schedule program in java

Hello Friends ,
Can any one provide me with an example how to create a schedule program using java.util.timer etc . I am in need of a program which should run as a schedule job that searches for a file in a directory and read the latest files from that directory in every minute of time as a schedule job .
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mahesh

I don't feel like writing my own example, but google will be happy to provide you with an example.

How to call the Standard Program in our ZPROGRAM?

Hi Frieds can you tell me the procedure how to call the Standard program
in z----
program and we have to get the data from standard one to our customer program.
Thanks in advance,
madan mohan.

Hi,
*Submit report but export resultant list to memory, rather than
*it being displayed on screen
SUBMIT zreport EXPORTING LIST TO MEMORY.
Once report has finished and control has returned to calling
program, use function modules LIST_FROM_MEMORY, WRITE_LIST and
DISPLAY_LIST to retrieve and display report.
*Example Code (Retrieving list from memory)
DATA BEGIN OF itab_list OCCURS 0.
        INCLUDE STRUCTURE abaplist.
DATA END OF itab_list.
DATA: BEGIN OF vlist OCCURS 0,
        filler1(01)   TYPE c,
        field1(06)    TYPE c,
        filler(08)    TYPE c,
        field2(10)    TYPE c,
        filler3(01)   TYPE c,
        field3(10)    TYPE c,
        filler4(01)   TYPE c,
        field4(3)     TYPE c,
        filler5(02)   TYPE c,
        field5(15)    TYPE c,
        filler6(02)   TYPE c,
        field6(30)    TYPE c,
        filler7(43)   TYPE c,
        field7(10)    TYPE c,
      END OF vlist.
SUBMIT zreport EXPORTING LIST TO MEMORY.
CALL FUNCTION 'LIST_FROM_MEMORY'
TABLES
    listobject = itab_list
EXCEPTIONS
    not_found = 4
    OTHERS     = 8.
CALL FUNCTION 'LIST_TO_ASCI'
EXPORTING
    list_index         = -1
TABLES
    listasci           = vlist
    listobject         = itab_list
EXCEPTIONS
    empty_list         = 1
    list_index_invalid = 2
    OTHERS             = 3.
IF sy-subrc NE '0'.
WRITE:/ 'LIST_TO_ASCI error !! ', sy-subrc.
ENDIF.
Regards
Sudheer

How to call a C program in java?

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