How to call a remote external c++ program from a local java program?

local java program pass some parameters to a remote C++ program and get the result from that C program output.

You could use a tcp/ip connection (e.g. with Sockets), and pass the parameters as Strings in the socketstream.

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How to run java programs from a master java program?

Hello,
I have several java programs which run from the command prompt. I am seeking help with code for starting java programs from within a java program. For example, a program called master.java works something like this:
import java.*;
create connection pool
create variables and result sets
start/run slave1.java (var1, var2);
start/run slave2.java (var3, var4, var5);
start/run slave3.java (var1, var4);
end of program master.java
Each of the slave.java programs will run for up to an hour. I do not want the master.java program to pause for each slave program to stop. Instead, the master program will keep running and multiple slave programs will be running simultaneously with the master program. When a slave program starts, it is on its own. Also, if possible, I would like to have each of these slave.java programs open in a new separate command window, so I can observe each slave program running in separate windows.
Any suggestions for code or helpful documentation are greatly appreciated.
Thank you,
Logan

Thank you all.
At the bottom of master.java I have successfully started a batch file with these lines:
String jcmd = "cmd.exe /c start c:/data/simulations/MsgViewCount2.bat";
Process proc = Runtime.getRuntime().exec(jcmd);
But I still cannot get a java program to start. Here is one variation I have tried:
String [] cmdArray = new String[2];
cmdArray[0] = "java";
cmdArray[1] = "slave1";
Runtime runtime = Runtime.getRuntime();
Process process = runtime.exec(cmdArray);
This compiles, and no errors occur, but nothing happens.
Regarding this comment:
Why Runtime.exec? Either make the slaves Runnable or
just call their main() methods.
Oh, I see. Sepearate output. :PNone of the slave.java programs have any output.
Thanks again.

Executing C program from with a java program

How do you call a c program from within a java program, and parse arguments into that program and return something.
Cheers for any reply...

Read http://www.javaworld.com/jw-12-2000/jw-1229-traps.html

Executing a Java Program from within a Java Program

I need to execute the following Java Program from withing another Java Program. The office toolbar command line is
D:\WINDOWS\system32\java.exe -cp E:\Development\Eclipse\UpdateServer\Classes -server -showversion UpdateServer
I can find no combination of ProcessBuilder commands, including those that include "Cmd.exe /c" that will make this program run from within another Java Program. All the examples I can find only show how to run Windows *.exe programs. I keep getting error 123 from ProcessBuilder.start(), but I can find no documentation for error 123.

Assuming your code didn't get mangled by the forum
(it's missing one "), it may be that your "-cp
E:\\Develop.." argument is getting quoted as it has a
space in it; try passing "-cp" and "E:\\Develop..."
as two arguments.That worked; specifically the following tested OK:
ProcessBuilder pb = new ProcessBuilder("D:\\WINDOWS\\System32\\Java.exe", "-cp", "E:\\Development\\Eclipse\\UpdateServer\\Classes\\", "-server", "-showversion", "UpdateServer" );
pb.directory(new File("E:\\Development\\Eclipse\\UpdateServer\\Classes\\"));
try{
     Process p = pb.start();
     InputStream is = p.getErrorStream();
     InputStreamReader isr = new InputStreamReader(is);
     BufferedReader br = new BufferedReader(isr);
     String line;
     while ((line = br.readLine()) != null)
          System.out.println(line);
     p.waitFor();
}catch(IOException ioe){
I was sure I tried that exact same code before, and it did not work, but now it does, at least at the top level (when it is in main of a test program). I will have to wait to try it until later when it is buried deep in a subroutine.

How to terminate and restart a java program from a controling java program?

I have a situation where my program needs to run exactly once each one
hour. This is a huge program that creates a lot of threads and opens
lot of resources. After one hour has lapsed, I want to terminate this
program (as if Exit(0) was performed on it or as if Ctrl C was pressed
from the command line to terminate a running program) and then run it again and so on repeat the cycle each hour. This will guarantee that
all the resouces taken by the programs are freed or if some threads were still blocked on i/o, are indeed terminated each hour.
The java program does not have any user interface and it is run from the
command line.

if you can change the program to be controlled, you could make it listen for commands on some networkport for shutting it down.
If this is not an option you could start OS programs to kill the first program. On Unix System kill will do, but you need the process id so you'd need another os call ...
You could do the os calls in two ways
a) execute shell commands (search the forum on how to do that
b) write a little C wrapper for the os call so you can call them from JNI (Java Native Interface)
I do not know of any way do this kind of thing directly
regards
Spieler

How to call parent view event or method from popup in java webdynpro

Hi ,
I have view in my webdynpro component. I created a button, when i click i am opening a popup window.
In side popup window i am doing some search criteria. I want call a parent view method from popup window and populate search results in parent view table control.I can able to pass the data through context mapping. But i want a custom method where i want to write a code to populate the table control ( i don;t want to use the wdDoModifyView() method).
Please help me.
Thanks
Aravinda

Hi,
     The methods in a view are only accessible inside same view. you cannot call it outside the view or
     in any other view although its in same component.
     If you want to have a method in both views, then create the method in component controller and
     from there you can access the method any where in whole component.

How to execute a Perl program from within a Java prog

How do I execute a Perl program from within a Java program.
Lets say the Perl program that I want to execute is 'abc'. Now, 'abc' requires some input that I want to give it from within the Java program. How do I do it?
And finally, how do I execute that Perl program from within the Java program.
If I execute the Perl program alone then I do it in the following way -
perl abc inp1 inp2 inp3
where inp1, inp2, inp3 are inputs to the Perl program. I will not be able to change or modify the coding of the Perl program - 'abc' as I do not have access to its code. Its a kind of an application whose usual method of execution is in the above shown way. So, how do I execute 'abc' from within a Java program.

what part of don't crosspost, don't you understand?
http://forum.java.sun.com/thread.jsp?forum=4&thread=427193

Executing a Perl program from within a Java prog

How do I execute a Perl program from within a Java program.
Lets say that the Perl program that I want to execute is 'abc'.'abc' requires some input that I want to give from within the java program. How do I do that? Then I want to execute the Perl program from within the Java prog. How do I do it?

don't crosspost.
http://forum.java.sun.com/thread.jsp?forum=31&thread=427211&tstart=0&trange=100

How to call a exe or bat file from java program

hi,
i actually want to know that how to call a exe or bat file from program so that i can run them parallely.

Try this :
String strCmd = "myFile.bat";
try
     Runtime rTime = Runtime.getRuntime();
     Process process = rTime.exec(strCmd);
     InputStream p_in = process.getInputStream();
     OutputStream p_out = process.getOutputStream();
     InputStream p_err = process.getErrorStream();
     p_in.close();
     p_out.close();
     p_err.close();
catch(Exception e) {
     throw new Exception("Unable to start, "+strCmd);
}

How to call main method in one class from another class

Suppose i have a code like this
class Demo
public static void main(String args[])
System.out.println("We are in First class");
class Demo1
public static void main(String args[])
System.out.println("We are in second class");
In the above program how to call main method in demo calss from Demo1 class......???????

No, i dont know how to call other than main methods from other classes
And one more doubt i have i.e. Like in C can we see the execution of the program like how the code is being compiled step by step and how the value of the variable changes from step to step like(Add Watch).........

How to call a AM method with parameters from Managed Bean?

Hi Everyone,
I have a situation where I need to call AM method (setDefaultSubInv) from Managed bean, under Value change Listner method. Here is what I am doing, I have added AM method on to the page bindings, then in bean calling this
Class[] paramTypes = { };
Object[] params = { } ;
invokeEL("#{bindings.setDefaultSubInv.execute}", paramTypes, params);
This works and able to call this method if there are no parameters. Say I have to pass a parameter to AM method setDefaultSubInv(String a), i tried calling this from the bean but throws an error
String aVal = "test";
Class[] paramTypes = {String.class };
Object[] params = {aVal } ;
invokeEL("#{bindings.setDefaultSubInv.execute}", paramTypes, params);
I am not sure this is the right way to call the method with parameters. Can anyone tell how to call a AM method with parameters from Manage bean
Thanks,
San.

Simply do the following
1- Make your Method in Client Interface.
2- Add it to Page Def.
3- Customize your Script Like the below one to Achieve your goal.
BindingContainer bindings = getBindings();
OperationBinding operationBinding = bindings.getOperationBinding("GetUserRoles");
operationBinding.getParamsMap().put("username", "oracle");
operationBinding.getParamsMap().put("role", "F1211");
operationBinding.getParamsMap().put("Connection", "JDBC");
Object result = operationBinding.execute();
if (!operationBinding.getErrors().isEmpty()) {
return null;
return null;
i hope it help you
thanks

How do you dump a external hard drive from PC to mac

How do i dump my external hard drive from a PC to my Mac

If you don't see the external HD when you connect it to the Mac, then you need to use Disk Utility to format the XHD to a FAT32 drive. Once done it will read on the Mac and PC without any problems.

How many softwares are there to create a setup file for java programs

Hi, i am new to java
I want to know how many softwares are there to create a setup file for java programs.
I know one software i.e java launcher to create a setup file.
I want to know about any other softwares are available to create a setup file for java programs.
I created a setup file for swings program in JCreator.
And don't think that i am wastiing ur time with this question .
Help me regarding this topic.
Thanks in Advance

superstar wrote:
I want to know how many softwares are there to create a setup file for java programs.13, no wait, 42.
I know one software i.e java launcher to create a setup file.You should clearly identify what you think you already know.
I want to know about any other softwares are available to create a setup file for java programs.
I created a setup file for swings program in JCreator.Is this the one you talked before, or is this different?
And don't think that i am wasting ur time with this question .Why should I not think that?

How to call a sql server stored procedure from oracle

Hi all,
Please anybody tell me how to call a sql server stored procedure from oracle.
I've made an hsodbc connection and i can do insert, update, fetch data in sql server from oracle. But calling SP gives error. when I tried an SP at oracle that has line like
"dbo"."CreateReceipt"@hsa
where CreateReceipt is the SP of sql server and hsa is the DSN, it gives the error that "dbo"."CreateReceipt" should be declared.
my database version is 10g
Please help me how can i call it... I need to pass some parameters too to the SP
thanking you

hi,
thank you for the response.
when i call the sp using DBMS_HS_PASSTHROUGH, without parameters it works successfully, but with parameters it gives the following error
ORA-28500: connection from ORACLE to a non-Oracle system returned this message:
[Generic Connectivity Using ODBC][Microsoft][ODBC SQL Server Driver]Invalid parameter number[Microsoft][ODBC SQL Server Driver]Invalid Descriptor Index (SQL State: S1093; SQL Code: 0)
my code is,
declare
c INTEGER;
nr INTEGER;
begin
c := DBMS_HS_PASSTHROUGH.OPEN_CURSOR@hsa;
DBMS_HS_PASSTHROUGH.PARSE@hsa(c, 'Create_Receipt(?,?)');
DBMS_HS_PASSTHROUGH.BIND_VARIABLE@hsa(c,1,'abc');
DBMS_HS_PASSTHROUGH.BIND_VARIABLE@hsa(c,2,'xyz');
nr:=DBMS_HS_PASSTHROUGH.EXECUTE_NON_QUERY@hsa(c);
DBMS_HS_PASSTHROUGH.CLOSE_CURSOR@hsa(c);
end;
Create_Receipt is the sp which requires two parameters.
please give me a solution
thanking you
sreejith

How to store xml data into file in xml format through java program?

HI Friends,
Please let me know
How to store xml data into file in xml format through java program?
thanks......
can discuss further at messenger.....
Avanish Kumar Singh
Software Engineer,
Samsung India Development Center,
Bangalore--560001.
[email protected]

Hi i need to write the data from an XML file to a Microsoft SQL SErver database!
i got a piece of code from the net which allows me to parse th file:
import java.io.IOException;
import org.xml.sax.*;
import org.xml.sax.helpers.*;
import org.apache.xerces.parsers.SAXParser;
import java.lang.*;
public class MySaxParser extends DefaultHandler
private static int INDENT = 4;
private static String attList = "";
public static void main(String[] argv)
if (argv.length != 1)
System.out.println("Usage: java MySaxParser [URI]");
System.exit(0);
String uri = argv[0];
try
XMLReader parser = XMLReaderFactory.createXMLReader("org.apache.xerces.parsers.SAXParser");
MySaxParser MySaxParserInstance = new MySaxParser();
parser.setContentHandler(MySaxParserInstance);
parser.parse(uri);
catch(IOException ioe)
ioe.printStackTrace();
catch(SAXException saxe)
saxe.printStackTrace();
private int idx = 0;
public void characters(char[] ch, int start, int length)
throws SAXException
String s = new String(ch, start, length);
if (ch[0] == '\n')
return;
System.out.println(getIndent() + " Value: " + s);
public void endDocument() throws SAXException
idx -= INDENT;
public void endElement(String uri, String localName, String qName) throws SAXException
if (!attList.equals(""))
System.out.println(getIndent() + " Attributes: " + attList);
attList = "";
System.out.println(getIndent() + "end document");
idx -= INDENT;
public void startDocument() throws SAXException
idx += INDENT;
public void startElement(String uri,
String localName,
String qName,
Attributes attributes) throws SAXException
idx += INDENT;
System.out.println('\n' + getIndent() + "start element: " + localName);
if (localName.compareTo("Machine") == 0)
System.out.println("YES");
if (attributes.getLength() > 0)
idx += INDENT;
for (int i = 0; i < attributes.getLength(); i++)
attList = attList + attributes.getLocalName(i) + " = " + attributes.getValue(i);
if (i < (attributes.getLength() - 1))
attList = attList + ", ";
idx-= INDENT;
private String getIndent()
StringBuffer sb = new StringBuffer();
for (int i = 0; i < idx; i++)
sb.append(" ");
return sb.toString();
}// END PRGM
Now , am not a very good Java DEv. and i need to find a soln. to this prob within 1 week.
The next step is to write the data to the DB.
Am sending an example of my file:
<Start>
<Machine>
<Hostname> IPCServer </Hostname>
<HostID> 80c04499 </HostID>
<MachineType> sun4u [ID 466748 kern.info] Sun Ultra 5/10 UPA/PCI (UltraSPARC-IIi 360MHz) </MachineType>
<CPU> UltraSPARC-IIi at 360 MHz </CPU>
<Memory> RAM : 512 MB </Memory>
<HostAdapter>
<HA> kern.info] </HA>
</HostAdapter>
<Harddisks>
<HD>
<HD1> c0t0d0 ctrl kern.info] target 0 lun 0 </HD1>
<HD2> ST38420A 8.2 GB </HD2>
</HD>
</Harddisks>
<GraphicCard> m64B : PCI PGX 8-bit +Accel. </GraphicCard>
<NetworkType> hme0 : Fast-Ethernet </NetworkType>
<EthernetAddress> 09:00:30:C1:34:90 </EthernetAddress>
<IPAddress> 149.51.23.140 </IPAddress>
</Machine>
</Start>
Note that i can have more than 1 machines (meaning that i have to loop thru the file to be able to write to the DB)
Cal u tellme what to do!
Even better- do u have a piece of code that will help me understand and implement the database writing portion?
I badly need help here.
THANX

How to call a remote external c++ program from a local java program?

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