Executing another exe from a java class

Hi All,
I want to execute another executable from a java class. I am doing that with the help of Runtime.getRuntime().exec(String) function.
My executable runs for quite sometime and it keeps printing something to stdout consistently.
I want to read whatever this exe is putting out to stdout as and when it is put out, not after the whole process has finished.
Now, Runtime.getRuntime().exec(String) just spawns the exe in another process space and I am not able to get its handle, maybe I have missed something.
Is there any other method/way to do what I want to?
TIA
-Satish

Now, Runtime.getRuntime().exec(String) just spawns the
exe in another process space and I am not able to get
its handle, maybe I have missed something.
Is there any other method/way to do what I want to?Acutally, Runtime.getRuntime().exec(String) returns a Process object. Use this process to "talk" to the program you just launched. For your needs, try Process.getOutputStream(). Take a look at the API for Process at http://java.sun.com/j2se/1.3/docs/api/java/lang/Process.html
Hope this helps.

Similar Messages

Problem executing .bat file from within Java class

I'm stumped: I have no problem executing a .bat file that sets classpaths and executes a Java jar, but when I try to execute other executables first and then the .jar, my application hangs and since the DOS box doesn't come up over my GUI, I can't see what's going on.
This works:
public void execute() throws Exception {
String s = "c:\\cs47auxs\\omnijar\\omni.bat";
Process p = Runtime.getRuntime().exec("\"" + s + "\"");
p.waitFor();
JOptionPane.showMessageDialog(frame,
"The Database Has Been Successfully Reloaded.",
"Information Message",
JOptionPane.INFORMATION_MESSAGE);
Here's the .bat 'omni.bat'
set JAVA_HOME=c:\j2sdk1.4.2_04\bin
%JAVA_HOME%\java -jar C:\CS47AUXS\OMNILOADJAR\OmniLoad.jar
This doesn't work:
public void execute() throws Exception {
String s = "c:\\cs47auxs\\omnijar\\jobomni.bat";
Process p = Runtime.getRuntime().exec("\"" + s + "\"");
p.waitFor();
JOptionPane.showMessageDialog(frame,
"The Database Has Been Successfully Reloaded.",
"Information Message",
JOptionPane.INFORMATION_MESSAGE);
Here's the .bat file 'jobomni.bat'
SET NETX_HOME=C:\CS47AUXS
SET COBOL_HOME=C:\CS47AUXS\OFFLINE
CD %NETX_HOME%
CALL SET-NETX.CMD
CD %COBOL_HOME%
SSBPPC10 JOBOMNI X
SET JH=C:\J2SDK1.4.2_04\BIN
SET OMNI_HOME=C:\CS47AUXS\OMNILOADJAR
CD %OMNI_HOME%
%JH%\java -jar omniload.jar
Can anyone shed some light here? Even when I execute the application from the command line the new DOS box doesn't become visible nor can I see any errors. If I could just get that visibility, I could probably figure out what is going wrong.

Same problem with me as well.... Badly looking for a solution...
I predict the following:
- If your batch file has pretty less number of dos/shell commands then it gets executed fine with exec() and proc.waitFor();
- If you increase the number of dos/shell commands in the bat file then try executing it then it definately hangs at proc.waitFor();
Even "cmd.exe /C C:\\test.bat" hangs... if the commands are more...
Is this some sort of bug? or am i doing anything wrong? I tried searching for solution on the net and search forums... but couldnt find a solution for the same.. not sure where i missed, what i missed...
Incase some one finds a solution.. do post it here...
Message was edited by:
amadas

How to make a .exe from a java .class

Hi All,
I want to write a scheduler program in Java and that class file I want to install as a service in windows scheduler. So for that purposr I need an executale right?
How can I convert a java class to a .exe program.
Thanks and Regards
KK

No need to create exe file. U can covert into .bat file. With help of windows scheduler u can run the file as per ur required.

Execute a .exe from a Java program

How can i execute a program though Java (e.g. the program could be a scandisk or disk defragmenter or paint etc.)
Is there a possibility to do that?

Yes, Runtime.getRuntime().exec(). this is for java 1.4.*
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Executing one system command from one java class. ERROR. Please help me

Hello i am trying to add users into one linux machine using one jaav program but when i execute the java class the system doesn't show me any error and dont make anything.
The linux command, in the main of the class, is correct; from thelinux shell it runs well, but from the java class it doesn't run.
Can you help me please?
thanks
import java.io.*;
public class ejecutaUsuario {
/** Creates a new instance of ejecutaUsuario */
public ejecutaUsuario(String cmdline) {
try {
String line;
Process p = Runtime.getRuntime().exec(cmdline);
BufferedReader input =
new BufferedReader
(new InputStreamReader(p.getInputStream()));
while ((line = input.readLine()) != null) {
System.out.println(line);
input.close();
catch (Exception err) {
err.printStackTrace();
System.out.println(err);
public static void main(String argv[]) {
String passwd="hola";
String usuarioInterno="xxxxxx";
new ejecutaUsuario("/bin/sh useradd -p `openssl passwd -1 -salt 12345678 " + passwd + "` -d /home/" + usuarioInterno + " -m -s /bin/bash " + usuarioInterno);

Try gettting the error input stream as well (getErrorStream()). Maybe you are getting output there.
You might want to try just executing the 'useradd' part, getting the output stream of that process, and then put the parameters of useradd into the outputstream.
Later
Cardwell

How to pass a "object" as a prameter from one java class to another java

hi experts, I want to know "How to pass and get object as a parameter from one java class to another java class". I tried follwoing code just check it and give suggetions..
import Budget.src.qrybean;
public class ConfirmBillPDF extends HttpServlet
qrybean db = new qrybean();
SimplePDFTable pdfTable = new SimplePDFTable();
pdfTable.simplePDFTableShow("2010","2011","1","2","1","131","102");
}Here i want to pass db with simplePDFTableShow method. simplePDFTableShow is in another java class. So how can i do this.
And also i want to know, how this obj will get.
please help me.
Edited by: andy_surya on Jul 14, 2010 7:51 AM

Hi andy_surya
what is this i am not understand
pdfTable.simplePDFTableShow("2010","2011","1","2","1","131","102");but i am try to solve your problem try this
qrybean db = new qrybean();
SimplePDFTable pdfTable = new SimplePDFTable();
pdfTable.simplePDFTableShow(db);and access like this in SimplePDFtable class update your method
simplePDFTable(qrybean tempDB)
// write your code
}

How to execute a jsp instruction from a java class?

How to execute a jsp instruction from a java class?
Any help please.
Thank's

I'll detail my problem:
Supposing that I have a jsp file called: start.jsp
In the start.jsp I instanciated an object called global from the class Global ( for example ).
Then, I called a custom taglib:
<ix:mytag/>
In the suitable tld file: the mytag is defined:
<tag>
<tag class>Tag1<.....
The java file Tag1 has method:
doStartTag(){
// here is the problem
global.doSomeFunctions();
Okay, the problem is that the object gobal is not defined in the class Tag1. what to do?
I think that I have to pass the object global as a parameter to the class Tag1. How to do that?
Actually, the problem was to insert the follwoing in the doStartTag method:
doStartTag(){
pageContext.getOut().print("<%= hello world %>");
The output is <%= hello world %> not hello world.
Okay, the new problem is how to pass an object as a parameter to a class called from a tld file.
Any help please.
Thank's too much

Problem with return a ColdFusion query object from a Java class

Hi!
I need to return a ColdFusion query object from a Java class
using a JDBC result set ( java.sql.ResultSet);
I have tried to pass my JDBC result set in to the constructor
of the coldfusion.sql.QueryTable class with this code:
ColdFusion code
<cfset pra = createObject("java","QueryUtil").init()>
<cfset newQuery = CreateObject("java",
"coldfusion.sql.QueryTable")>
<cfset newQuery.init( pra.getColdFusionQuery () ) >
My java class execute a query to db and return QueryTable
Java code (QueryUtil.java)
import coldfusion.sql.QueryTable; // (CFusion.jar for class
QueryTable)
import com.allaire.cfx //(cfx.jar for class Query used from
QueryTable)
public class QueryUtil
public static coldfusion.sql.QueryTable
getColdFusionQuery(java.sql.ResultSet rs)
return new coldfusion.sql.QueryTable(rs);
but when i run cfm page and coldfusion server tries to
execute : "<cfset pra =
createObject("java","QueryUtil").init()>" this error appears:
Object Instantiation Exception.
An exception occurred when instantiating a java object. The
cause of this exception was that: coldfusion/sql/QueryTable.
If i try to execute QueryUtil.java with Eclipse all it works.
Also I have tried to return java.sql.ResultSet directly to
coldfusion.sql.QueryTable.init () with failure.
Do you know some other solution?

ok
i print all my code
pratica.java execute a query to db and return a querytable
java class
import java.util.*;
import java.sql.*;
import coldfusion.sql.*;
public class Pratica {
private HashMap my;
private String URI,LOGIN,PWD,DRIVER;
private Connection conn=null;
//funzione init
//riceve due strutture converite in hashmap
// globals
// dbprop
public Pratica(HashMap globals,HashMap dbprop) {
my = new HashMap();
my.put("GLOBALS",globals);
my.put("DBPROP",dbprop);
URI = "jdbc:sqlserver://it-bra-s0016;databaseName=nmobl";
LOGIN = "usr_dev";
PWD = "developer";
DRIVER = "com.microsoft.sqlserver.jdbc.SQLServerDriver";
try{
// Carico il driver JDBC per la connessione con il database
MySQL
Class.forName(DRIVER);
/* Connessione alla base di dati */
conn=DriverManager.getConnection(URI,LOGIN,PWD);
if(conn!=null) System.out.println("Connection Successful!");
} catch (ClassNotFoundException e) {
// Could not find the database driver
System.out.print("\ndriver non trovato "+e.getMessage());
System.out.flush();
catch (SQLException e) {
// Could not connect to the database
System.out.print("\nConnessione fallita "+e.getMessage());
System.out.flush();
//funzione search
//riceve un hash map con i filtri di ricerca
public QueryTable search(/*HashMap arg*/) {
ResultSet rs=null;
Statement stmt=null;
QueryTable ret=null;
String query="SELECT * FROM TAN100pratiche";
try{
stmt = conn.createStatement();// Creo lo Statement per
l'esecuzione della query
rs=stmt.executeQuery(query);
// while (rs.next()) {
// System.out.println(rs.getString("descrizione"));
catch (Exception e) {
e.printStackTrace();
try {
ret = Pratica.RsToQueryTable(rs);
} catch (SQLException e) {
e.printStackTrace();
this.close();
return(ret);
// ret=this.RsToQuery(rs);
// this.close(); //chiude le connessioni,recordset e
statament
//retstruct CF vede HashMap come struct
//METODO DI TEST
public HashMap retstruct(){
return(my);
//conversione resultset to querytable
private static QueryTable RsToQueryTable(ResultSet rs)
throws SQLException{
return new QueryTable(rs);
//chiura resultset statament e connessione
private void close(){
try{
conn.close();
conn=null;
catch (Exception e) {
e.printStackTrace();
coldfusion code
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01
Transitional//EN">
<html>
<head>
<title>Test JDBC CFML Using CFScript</title>
</head>
<body>
<cftry>
<cfset glb_map =
createObject("java","java.util.HashMap")>
<cfset dbprop_map =
createObject("java","java.util.HashMap")>
<cfset glb_map.init(glb)> 
<cfset dbprop_map.init(glb["DBPROP"])>
<cfset pra =
createObject("java","Pratica").init(glb_map,dbprop_map)>
<cfset ourQuery
=createObject("java","coldfusion.sql.QueryTable").init(pra.search())>
<cfcatch>
<h2>Error - info below</h2>
<cfdump var="#cfcatch#"><cfabort>
</cfcatch>
</cftry>
<h2>Success - statement dumped below</h2>
<cfdump var="#ourQuery#">
</body>
</html>
error at line <cfset pra =
createObject("java","Pratica").init(glb_map,dbprop_map)>
An exception occurred when instantiating a java object. The
cause of this exception was that: coldfusion/sql/QueryTable.
-----------------------------------------------------------------------

Facing problem in creating socket in a method from an already deployed application exe while same method is working from another exe from same environment from same location.

Dll Created In: - MFC VC
6.0
Application Exe Developed In:
- VC 6.0, C# and VB.net (Applications which are using dll)
OS: - Windows XP sp2 32bit
/ Windows Server 2008 64 bit
Problem: - Facing problem in creating socket
in a method from an already deployed application exe while same method is working from another exe from same environment from same location.
Description: - We have product component which
has an exe component and from exe we invoke a method, which is defining in dll, and that dll is developed in MFC VC6.0. In the dll we have a method which downloads images from another system after making socket connection. But every time we are getting Error
code 7, it is not giving desire result while same method is working from another exe from same environment from same location. And also me dll is deployed on many systems and giving proper output from same application.
Already Attempt: - Because error is coming on
client side so what we did, we created a driver in C# which invokes same method from same environment(on client machine) using same dll and we are astonished because it worked fine there.
Kindly Suggest: -
We are not able to figure out root cause because nothing is coming in windows event logs but what I did, for finding the problem line, I wrote logs on each line and found the exact line in application exe which is not working,
actually it is not executing Create () method,
I will give snippet of the code for understanding the problem because we are not finding any kind solution for it.
Kindly assist us in understanding and fixing this problem.
Code Snippet: -
Int Initialize (LPTSTR SiteAddress, short PortId)
try
CClientTSSocket *m_pJtsSockto;
m_pJtsSockto = new CClientTSSocket;
LONG lErr = m_pJtsSockto->ConnectTS(csIPAddress,PortId);
ErrorLog (0, 0, "--------ConnectTS has been called ------------","" );
catch(...)
DWORD errorCode = GetLastError();
CString errorMessage ;
errorMessage.Format("%lu",errorCode);
ErrorLog (0, 0, "Image System", (LPTSTR)(LPCTSTR)errorMessage);
return IS_ERR_WINDOWS;
Note: -
CClientTSSocket extends CAsyncSocket
IS_ERR_WINDOWS is a macro error code which value I found 7.
LONG ConnectTS(CString strIP, UINT n_Port)
ErrorLog(0,0,"ConnectTS is calling Create [is going to call]","");
if(!Create())
ErrorLog(0,0,"ConnectTS is calling [Create not called successfully] ","");
n_Err = GetLastError();
ErrorLog(n_Err,0,"ConnectTS is calling1111111111111111Erorrrrrrrrrrrrr","");
return NET_INIT;
ErrorLog(0,0,"ConnectTS is calling2222222222222222222","");
if(!AsyncSelect(0))
n_Err = GetLastError();
return NET_INIT;
if(!Connect(strIP,n_Port))
n_Err = GetLastError();
ErrorLog(n_Err,0,"ConnectTS","");
return SERVER_NOT_CONNECTED;
Code description: -
From
int GETImage_MT() method we call Initialize() method and pass client machine IP and Port and there we call
ConnectTS() method, In this method we Create() method and finally it returns the error code as mention in macro 7.
Logs after running the program: -
--------ConnectTS has been called ------------
ConnectTS is calling Create [is going to call]
Image System
0
Note: - According to logs, problem is coming in Create method().
Here 0 is errorMessage received in catch block. And from catch block it returns macro value 7. And when we run same method individually from same machine, same environment through same dll
from different exe, it is working fine and we are facing any kind of problem. While same problem application was working properly earlier but now continuously it showing problem.
Kindly assist us to resolve the issue.

Pointer variable was already initialized; I have mention in code; kindly assist us.
Dll Created In: - MFC VC 6.0
Application Exe Developed In: - VC 6.0, C# and VB.net (Applications which are using dll)
OS: - Windows XP sp2 32bit / Windows Server 2008 64 bit
Problem: - Facing problem in creating socket
in a method from an already deployed application exe while same method is working from another exe from same environment from same location.
Description: - We have product component
which has an exe component and from exe we invoke a method, which is defining in dll, and that dll is developed in MFC VC6.0. In the dll we have a method which downloads images from another system after making socket connection. But every time we are getting
Error code 7, it is not giving desire result while same method is working from another exe from same environment from same location. And also me dll is deployed on many systems and giving proper output from same application.
Already Attempt: - Because error is coming
on client side so what we did, we created a driver in C# which invokes same method from same environment (on client machine) using same dll and we are astonished because it worked fine there.
Kindly Suggest:
- We are not able to figure out root cause because nothing is coming in windows event logs but what I did, for finding the problem line, I wrote logs on each line and found the exact line in application exe which is not
working, actually it is not executing Create () method, I will give snippet of the code for understanding
the problem because we are not finding any kind solution for it. Kindly assist us in understanding and fixing this problem.
Code Snippet: -
Int Initialize (LPTSTR SiteAddress, short PortId)
try
CClientTSSocket *m_pJtsSockto;
m_pJtsSockto = new CClientTSSocket;
LONG lErr = m_pJtsSockto->ConnectTS(csIPAddress,PortId);
ErrorLog (0, 0, "--------ConnectTS has been called ------------","" );
catch(...)
                   DWORD errorCode = GetLastError();
                   CString errorMessage ;
                   errorMessage.Format("%lu",errorCode);
                   ErrorLog (0, 0, "Image System", (LPTSTR)(LPCTSTR)errorMessage);
                   return  IS_ERR_WINDOWS;
Note: - CClientTSSocket extends CAsyncSocket
IS_ERR_WINDOWS is a macro error code which value I found 7.
LONG ConnectTS(CString strIP, UINT n_Port)
          ErrorLog(0,0,"ConnectTS is calling Create [is going to call]","");
          if(!Create())
                   ErrorLog(0,0,"ConnectTS is calling [Create not called successfully] ","");
          n_Err = GetLastError();
          ErrorLog(n_Err,0,"ConnectTS is calling1111111111111111Erorrrrrrrrrrrrr","");
                  return NET_INIT;
          ErrorLog(0,0,"ConnectTS is calling2222222222222222222","");
          if(!AsyncSelect(0))
                   n_Err = GetLastError();
                   return NET_INIT;
          if(!Connect(strIP,n_Port))
                   n_Err = GetLastError();
                   ErrorLog(n_Err,0,"ConnectTS","");
                   return SERVER_NOT_CONNECTED;
Code description: - From int GETImage_MT() method
we call Initialize() method and pass client machine IP and Port and there we call ConnectTS() method, In
this method we Create() method and finally it returns the error code as mention in macro 7.
Logs after running the program: -
--------ConnectTS has been called ------------
ConnectTS is calling Create [is going to call]
Image System  0
Note: - According to logs, problem is coming in Create method(). Here
0 is errorMessage received in catch block. And from catch block it returns macro value 7. And when we run same method individually from same machine, same environment through same dll from different exe, it is working fine and we are facing any kind of problem.
While same problem application was working properly earlier but now continuously it showing problem.
Kindly assist us to resolve the issue.

Calling another application from a java program

Hi, Java ppl.
I wanted to know how can I call another program say a help application or an exe from a java program. anyone with any advice or a piece of code would help.
Thanks
Pradeep

I had the same situation and I tried the code that you sugested and it works. I was wondering, what am I expecting in the while loop that appears after the int inp; statement? Is some data going to be displayed on the screen? How essential is to have that while loop after the calling the exec() method?
Sorry for the amount of questions, I never tried this before.
Best regards,
Luis E.

Call Bean from normal java class

Dear Friends,
Is it ok to call an entity bean or session bean frm normal Java class.
(Java class is in the same application as the beans).
Is there a special way to lookup the beans from normal java classes.
Thanking You,
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it is ok and very commonly done.
Note that the simple java program must be running in the same local network. You cannot have the java program and EJBs distributed over internet. (I m not certain of it, but mostly I shoudl be correct. If you have the resources, try it out and let me know)
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Pda execute other exe from Labview

I'm looking for ways to execute an exe from Labview PDA that is stored on the PDA (another PDA application)... I'm running WM5.0 ... .any ideas ...
Greycat

Hey Greycat.
That is a great question! So as you noticed there is no equivalent to System Exec in LabVIEW PDA, so you cannot launch an application that way. I would think that there would be a DLL that could be called on the PDA that will allow you to launch applications. However, after several Google searches I was not able to come up with any specific code or DLLs. Once you found that DLL hoewever, you shouldn't have problems launch an EXE. I am assuming that these are not other LabVIEW PDA built EXEs, which is a shame since you might be able to open a VI reference to that VI.
Andy F.
Message Edited by Andy F. on 04-25-2006 06:52 PM
National Instruments

Execute another exe file by my VI

Hello,
I am trying to execute anothe exe file, which was not created using LabView, from my VI.
Is it possible? How could I do it?
Thank you

Use the System Exec function. Under Connectivity -> Libraries & Executables palette.

How can I call a pop up window from a java class ?

Hi,
I am developing a web app. I would like to call a windoz pop up from a java class.
How can i do that ?
Thanks

user504072 wrote:
It was possible to do it in ASP .NET even from the server side with the method Page.ClientScript. What do you think what Page.ClientScript stands for?
I's an encapsulation for the JavaScript code required and hides the separation between frontend and backend. There was a reason why so many developers stick to the MVC-pattern wich ist violated here.
I did not know it is not possible to do the same thing in Java.I'ts not a task of the backend to layout the user interaction GUI.
bye
TPD

Any difference in creating a web service from a java class or session bean?

Hi,
The JDeveloper tutorial at http://www.oracle.com/technology/obe/obe1013jdev/10131/devdepandmanagingws/devdepandmanagingws.htm demonstrates creating a web service from a plain java class. I'm wondering:
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Thanks for any ideas about this.

Hi,
EJB Session beans (EJB 3.0) are deployed as WebServices by annotating the class with @WebService and the methds with @WebMethod (both tags require you to add the JSR-181 library to your project (available in the JDeveloper list of libraries)). Unlike the J2E WebService, the EJB session bean service is turned into a WebService upon deployment. This means you obtain teh WSDL file after deployment
- Assuming it's possible to create a web service from a stateless session bean, is there any advantage/disadvantage creating a web service from a java class vs a stateless session bean?
The difference is that EJB Session bean based web services are integrated with the J2EE container, which means that they can leverage container services like transaction handling, data sources, security, JMS etc.
Frank

Executing another exe from a java class

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