Start java application from another programm

Hi everyboda on this side,
i got a big problem. I would like to start out of MS excel an java programm and I would like to hand over data from the MSexcel programm to the java programm. I hope someone can help me. My idea was to create a batchfile, which I start from the excel-programm to run the java programm, but how do I hand over the data from excel to java?
In advance thanks to all the ones, who tried to help me - max

You could try to use a JDBC-ODBC bridge that allows you read the data of your excel file.....
Here, a guide for use it:
http://java.sun.com/j2se/1.3/docs/guide/jdbc/getstart/bridge.doc.html
Hope this helps.

Similar Messages

Calling Java Application from another

How can i call a Java Application from another java App.
eg., If my Java application is called MyApp and i would like call another java application from within it.
One way could be by using "System". I would like to know if there is any other method and is portable.
Thanks in advance.

hi,
it works and not!
if you start an other class with a command like this the 2nd prog/class terminates too if you terminate the caller-class!
dear
oliver scorp

Invoke one java application from another?

Hello,
Can anyone tell me how to Invoke one java application from another?
Suppose I have a small java application say, Hello.java which has its own main() method and
I also have another java application, say World.java which has its own main() method too.
What I want to do is invoke or startup World.java from Hello.java.
If possible kindly give code examples?

main is just a normal method so Hello can invoke the main method of World just as it would invoke any other method.
Kaj

Launching a java application from another java application

Hi,
I'm facing an interesting challenge :-)
Inside a Java application, I want to start another java application.
Possible solutions in my list :
1. Using jakarta commons launcher.
2. Runtime.exec (make the code platform dependent).
3. Starting the main method of the other app by create a new Thread inside the current app
4. I know people did this by calling an ant target from the java application but I don't have
any sample code, I appreciate any sample code for it.
Thanks,
Ali Salehi

That is an iteresting challenge :)Don't be mean; he's polite, done some investigation and taken the trouble to be clear. The question, presumably, is "has anyone got a different solution or a preference as to which of these is the best?"
In which case, my advice would be to say that invoking main in a separate thread is fundamentally different from Runtime.exec() because the former would run in the same JVM. Is this what you want? If one app has the other on its classpath then do they need to be separate apps? Could they be modules of a single app?

Calling a java application from another

Hello,
i have noticed a strange behaviour of my java app when i open it from another java app. When i run the core application with a bat file using jre1.6 everything works fine. Now what i want to do is create an application that checks the existance of jre 1.6, downloads it if it does not exist and run real application with the new jre. The second small app runs with a small jre 1.4.2. In reality it seem to work fine, it downloads the jre1.6 folder and exits normally. However when the real application is launched it behaves strangely without throwing any exceptions. And this behaviour seems to be random. for example, a jpanel may not show any components, or the whole jframe may close suddenly. Does anyone have any idea what is going on? Is there a chance that some classes of the first jre remain in memory and conflict when the second application is launched?

Just a wild guess: maybe you're invoking the java 1.6 binaries, but JAVA_HOME or something is pointing to java 1.4 libraries (or vice-versa), and you've found some weird interaction issue.

Starting Java application from other Java application..

Hi all,
I was wondering if it is possible to start a Java program from an other Java program.
In Java program 1, I have this code to execute the other application:
try {
Process p = Runtime.getRuntime().exec("cmd /c java -cp JavaApp2.jar com.test.TestFrame");
} catch (IOException e) {
}I tried this code, but unfortunately I couldn't opened the other (JavaApp2.jar) Java Application. Is there a way to open the other application anyways?
I really hope someone can help me. Help would be greatly appreciated! Thanks in advance.
Tongue78.

What if there is no JAR file?Then you can make it out of the .class files. And to anticipate your next question, if there are no .class files there is no application at all, so you can't exec() it or call the main() method directly. Your point?
And JAR isn't part of the Java language.It is a major part of the Java platform.
This means you can only get access to a JAR file via the OS. Wrong again. CLASSPATH. URLClassLoader.
In short you cannot just shout main() in a Java program and hope some other Java program will hear you and start.Absolute rubbish. If the required classes are on the CLASSPATH you just call com.company2.app2.main(args) and off you go. Or you can load the main class and invoke its main() reflectively.
No source code required, or 'source code merge' either.

Start java application from java program

My problem is the following:
I start a java application A that allows you to select a couple of .java files.
After having choosen them, the application adds some additional information to these .java files (that means some more lines of code � we call it �infecting� the java files).
After the files have been infected, I want to start the application B implemented by these choosen and infected .java-files (without a new start of the Java Virtual Machine)
For doing so, we use the following method whichs works quite fine:
public static void ExecuteWithInvoke(String path, String classname)
 try
 new URLClassLoader(new URL[] {new File(path).toURL()})
 .loadClass(classname).getMethod("main",
 new Class[] { String[].class }).invoke(null,
 new Object[] { new String[] {} });
 catch (Exception e)
 {e.printStackTrace();}
The only problem that occurs:
When the application B is launched, the �old� version of the choosen .java files is used and not the current, already infected version of these files. (I guess because the �old� .class files are used.)
I solved this problem by finishing the program A after the infecting and restart my application B manually. In this case the infected .java files are used (I guess the new Start of the Java Virtual Machine solves my problem by reloading the �new� .class files)
How can I reach to start my application with the mentioned method but with the infected .java files and without having a new start of the JVM ??
Can anybody help me?
Thanks in advance
Sorry for my English, it�s a long time since I quit school

Hello,
my problem of reloading classes is still unsolved although you tried to help me!
Therefore I posted a little program to illustrate our difficulty.
It would be nice if somebody could have a look at this program.
We have a file Testdatei.java whose only method is the main method.
I get the class object of this file and with the help of Reflection the declared methods.
Evereything works fine so far.
Then I change the content of this file by adding an additional method a() (see change() for this).
Now I delete the old class file and I compile Testdatei.java again (see compileJava()) and once more I get the class object for this changed file. Afterwards I get the declared methods for this class via reflection.
But instead of showing now the methods main() and a() Reflection still only shows the method main().
I guess the changed class has not been reloaded!!
package testpackage;
import java.io.BufferedWriter;
import java.io.File;
import java.io.FileWriter;
import java.io.IOException;
import java.lang.reflect.Method;
import java.net.URL;
import java.net.URLClassLoader;
import com.sun.tools.javac.Main;
public class LoadClass
 private File f;
 private Class c = null;
 private Object o;
 public LoadClass()
 f = new File("C:/AAJ/src/testpackage/Testdatei.java");
 try
 o = neuesExemplar(f.getPath(), "testpackage.Testdatei");
 c = o.getClass();
 System.out.println("Class " + c.getName() + " found.");
 catch (Exception e)
 {e.printStackTrace();}
 Method [] method = c.getDeclaredMethods();
 for (int i=0; i<method.length; i++)
 System.out.println(method.getName());
 change();
 compileJava(f.getPath());
 File fileToDelete = new File("bin/testpackage/Testdatei.class");
 System.out.println(fileToDelete.delete());
 Class cla = null;
 try
 Object o = neuesExemplar(f.getPath(), "testpackage.Testdatei");
 cla = o.getClass();
 System.out.println("Class " + cla.getName() + " found.");
 catch (Exception e)
 {e.printStackTrace();}
 Method [] methods = cla.getDeclaredMethods();
 for (int i=0; i<methods.length; i++)
 System.out.println(methods[i].getName());
 private int compileJava(String javaFile)
 String[] args = {"-d", "C:/AAJ/bin/", "-classpath", System.getProperty("java.class.path"), javaFile};
 return Main.compile(args);
 public static void main(String[] args)
 new LoadClass();
 private Object neuesExemplar(String pfad, String klassename) throws Exception
 URL url = new File(pfad).toURL();
 URLClassLoader cl = new URLClassLoader( new URL[]{ url });
 Class c = cl.loadClass(klassename);
 return c.newInstance();
 private void change()
 FileWriter fw;
 BufferedWriter bw;
 try
 fw = new FileWriter(f);
 bw = new BufferedWriter(fw);
 bw.write("package testpackage;");
 bw.newLine();
 bw.newLine();
 bw.write("public class Testdatei");
 bw.newLine();
 bw.write("{");
 bw.newLine();
 bw.write("public static void main (String [] args)");
 bw.newLine();
 bw.write("{");
 bw.write("System.out.println(4);");
 bw.newLine();
 bw.write("}");
 bw.newLine();
 bw.newLine();
 bw.write("private void a ()");
 bw.newLine();
 bw.write("{");
 bw.newLine();
 bw.write("System.out.println(55);");
 bw.newLine();
 bw.write("}");
 bw.newLine();
 bw.write("}");
 bw.close();
 fw.close();
 catch (IOException e)
 {e.printStackTrace();}
I�m using eclipse 3.1.0. Is it possible that it�s a bug in eclipse that eclipse holds the old class file in memory from the beginning and always refers to this one and not to the new compiled one?
Thanks a lot
Simon

Start java application from jsp?

is there any way i can have a JSP, bean or servlet start a java application on the server? maybe a better question is: what can i do to make sure that some class is always running on my javaserver? im talking about the server app. for a chat program that im making that will be an applet in a JSP page along with a load of other JSP pages that do other things...
sorry for my incoherence. i usually talk better than this. :)
Laz

just replying so the message comes to the top of the forum... can anyone help me here?
Thanks
Laz

How do I start and suspend Java Application from say C++ program

I want to start a Java application via C++ and on some condition i want to suspend the same program not terminate , but suspend

Have you tried running the virtual machine from your C++ application ? You can start Java applications from your C++ application using JNI after starting the Virtual machine from within your C++ application. According to the Java documentation you can even now stop the virtual machine from within your C++ program.
I haven't looked at the 'suspend' detail but I suppose it will not be a problem to call a method via JNI to set a flag to suspend a thread etc.
There is a tutorial: 'Invoking the Java Virtual Machine' at the following URL: http://java.sun.com/docs/books/tutorial/native1.1/invoking/invo.html.
This example seems to work only for version1.1 of the JDK. For JDK1.3, version 1.2, (I am not so sure whether I fully understand Sun's version numbers for Java yet) there is some updates on the JNI for starting the VM from C++. This article is called 'JNI Enhancements'. The URL for this article is:
http://java.sun.com/j2se/1.3.0/docs/guide/jni/jni-12.html
You have to set version to: JNI_VERSION_1_2
There is only one problem. I get an error when calling JNI_CreateJavaVM from C++. I could not find any documentation that indicates how you can go about diagnosing what is causing the problem. Normally in Visual C++ you can just get the probable cause by inspecting GetLastError() or the function itself can return helpful diagnostic (error) codes.
If you manage to start the VM correctly from within Visual C++ please let me know. My email address is [email protected]
good luck
Henko

Calling Java application from servlet

Hi !
I'm trying to run a Java application from within a servlet with Tomcat 4. I'm using the Runtime.getRuntime ().exec () method. So the application is run in a different JVM as a subprocess of the servlet. I use ObjectInputStream and ObjectOutputStream and a serializable object to enable communication between the servlet and the application.
I tested the application and the serializable object with another Java application that works as the caller and it works fine. However, replacing the caller application with the servlet I get a StreamCorruptedException. The structure of the caller application and the servlet is the same.
My questions are:
- Is there something I should configure in Tomcat to create a subprocess ?
- What is the cause of the StreamCorruptedException ? How do I get it with the servlet and not with the application ?
- Should I use an environment with the call to Runtime.getRuntime ().exec () ? How do I use it ?
- Is the called application forced to run in my servlet's context ?
- Is there a better way to do this ?
Thanks to all

Here's my code:
1. The serializable object:
// Object Obj
import java.io.*;
public class Obj implements Serializable
public int n;
public Obj ()
n = 0;
public Obj (int n)
this.n = n;
public String toString ()
return getClass ().getName () + " -> (n = " + n + ")";
2. The application Sub (subprogram)
// Application Sub
import java.io.*;
public class Sub
private static File f;
private static FileWriter fw;
public static void main (String [] args)
throws IOException, InterruptedException, ClassNotFoundException
ObjectInputStream ois;
ObjectOutputStream oos;
Obj obj;
ois = new ObjectInputStream (System.in);
obj = (Obj) ois.readObject ();
f = new File ("Sub.txt");
fw = new FileWriter (f);
fw.write (obj.toString ());
fw.close ();
oos = new ObjectOutputStream (System.out);
oos.writeObject (obj);
ois.close ();
oos.close ();
3. The application AMain (caller application)
// Application AMain
import java.io.*;
class AMain
private static File f;
private static FileWriter fw;
public static void main (String [] args)
throws IOException, ClassNotFoundException
Runtime r;
Process p;
ObjectInputStream ois;
ObjectOutputStream oos;
Obj obj, obj2;
r = Runtime.getRuntime ();
p = r.exec ("java Sub");
oos = new ObjectOutputStream (p.getOutputStream ());
obj = new Obj (5);
oos.writeObject (obj);
oos.flush ();
B.comunica (obj);
System.out.println ("AMain sends to Sub: " + obj.toString ());
try
p.waitFor ();
catch (InterruptedException e)
System.out.println ("Subprogram was interrupted");
System.out.println (e.toString ());
ois = new ObjectInputStream (p.getInputStream ());
System.out.print ("Sub sends to AMain: ");
obj2 = (Obj) ois.readObject ();
System.out.println (" " + obj2.toString ());
oos.close ();
ois.close ();
p.destroy ();
4. The servlet SMain (the calling servlet)
// Servlet SMain
import javax.servlet.*;
import javax.servlet.http.*;
import java.sql.*;
import java.io.*;
import java.util.*;
public class SMain extends HttpServlet
public void doPost (HttpServletRequest req, HttpServletResponse res)
throws ServletException, IOException
Runtime r;
Process p;
ObjectInputStream ois;
ObjectOutputStream oos;
Obj obj, obj2;
int state, i;
res.setContentType ("text/html");
ServletOutputStream out = res.getOutputStream ();
out.println ("<html>");
out.println ("<head><title>Sub</title></head>");
out.println ("<body>");
out.println ("Invoking subprogram...");
out.println (" ");
try
r = Runtime.getRuntime();
p = r.exec ("java -cp .;c:\\Programs\\Apache~1.0\\webapps\\SMain\\WEB-INF\\classes Sub");
out.println ("...invoked ");
oos = new ObjectOutputStream (p.getOutputStream ());
obj = new Obj (5);
oos.writeObject (obj);
oos.flush ();
out.println (" SMain sends to Sub: " + obj.toString () + " ");
try
p.waitFor ();
catch (InterruptedException e)
out.println (" Subprogram was interrupted ");
out.println (" " + e.toString () + " ");
state = p.exitValue ();
out.println (" Subprogram state: " + state + " ");
ois = new ObjectInputStream (p.getInputStream ());
out.print (" Sub sends to SMain: ");
obj2 = (Obj) ois.readObject ();
p.destroy ();
catch (SecurityException e)
out.println (" SecurityException ");
out.println (" " + e.toString () + " ");
catch (IOException e)
out.println (" IOException ");
out.println (" " + e.toString () + " ");
catch (Exception e)
out.println (" Exception ");
out.println (" " + e.toString () + " ");
out.println ("</body>");
out.println ("</html>");
So, as you can see, both application AMain and servlet SMain invoke application Sub and pass it the serializable object Obj. Oddly enough, application AMain works fine whereas servlet SMain throws a StreamCorruptedException exception.
johnpoole said:
�It's hard to guess what would cause the exception without seeing code, but the interaction between the processes would differ from that between two applications, because the servlet process is started with a different class loader. I'm not sure which one the jvm started by the call would use.�
How can I enforce that a System classloader be used in the call to Runtime.getRuntime ().exec () ? (I mean by System classloader a classloader equals to the one applications are launched from console).
johnpoole said
�Is there a reason why you aren't starting the second process manually and then connecting to it on a port?�
The idea is providing a Web interface for an application running in the server. The servlet is used to restrict access to this application but once access is granted (passing the servlet) the application should not be constrained.

Not able to execute one Java program from another one via. exec()

Hi,
I am new to this forum, so I might be asking a very trivial quetion.
My program Ap1 is :
class Ap1
public static void main(String a[]) throws Exception
Runtime rt=Runtime.getRuntime();
Process p=null;
p=rt.exec("javac,Pr.java");
Runtime.getRuntime().exec("javac,Pr.java");
When I run the above program, I get below error at the line 7(bold one):
D:\batchwe>javac Ap1.java
D:\batchwe>java Ap1
Exception in thread "main" java.io.IOException: CreateProcess: javac,Pr.java err
or=2
at java.lang.ProcessImpl.create(Native Method)
at java.lang.ProcessImpl.<init>(ProcessImpl.java:81)
at java.lang.ProcessImpl.start(ProcessImpl.java:30)
at java.lang.ProcessBuilder.start(ProcessBuilder.java:451)
at java.lang.Runtime.exec(Runtime.java:591)
at java.lang.Runtime.exec(Runtime.java:429)
at java.lang.Runtime.exec(Runtime.java:326)
at Ap1.main(Ap1.java:7)
Path is set as below(which seems correct):
D:\batchwe>path
PATH=C:\Program Files\Java\jdk1.5.0_05\bin
I am just wondering how to call one Java program from another one?!
Please help.
thanks
Rashmi

Hi diptaPB,
Thanks for your suggestion.
Here is how I tried it again, but not getting the desired output:
Class Pr looks like below -->
class Pr
public static void main(String a[])
System.out.println("hi from process");
When I run 'Pr' from command prompt, i get the desired output:
D:\batchwe>java Pr
hi from process
However, when I call 'Pr' from another program Ap2.java, it seems that it does not call 'Pr':
class Ap2
public static void main(String a[]) throws Exception
Runtime rt=Runtime.getRuntime();
Process p=null;
String[] cmd=new String[2];
cmd[0]="javac";
cmd[1]="Pr.java";
p=rt.exec("cmd");
D:\batchwe>javac Ap2.java
D:\batchwe>java Ap2
************* no output appears here***********************
Looking forward for your help.
regards
Rashmi

Running a Java application from a Swing GUI

Hi,
I was wondering if there is a simple way to run a Java application from a GUI built with Swing. I would presume there would be, because the Swing GUI is a Java application itself, technically.
So, I want a user to click a button on my GUI, and then have another Java application, which is in the same package with the same classpaths and stuff, run.
Is there a simple way to do this? Do any tutorials exist on this? If someone could give me any advice, or even a simple "yes this is possible, and it is simple" or "this is possible, but difficult" or "no this is not possible" answer, I would appreciate it. If anyone needs more information, I'll be happy to provide it.
Thanks,
Dan

I don't know if it is possible to run the main method from another Java app by simply calling it...
But you could just copy and paste the stuff from your main method into a new static method called something like runDBQuery and have all the execution run from there.
How does that sound? Is it possible?
What I'm suggeting is:
Original
public class DBQuery{
public static void methodA(){
public static void doQuery(){
methodA();
public static void main(String[] args){
// Your method calls
//Your initializing
doQuery();
}Revised:
public class DBQuery{
public static void methodA(){
public static void doQuery(){
methodA();
public static void doMyQuery(){
// Your method calls
//Your initializing
doQuery();
// No main needed!!
//public static void main(String[] args){
// Your method calls
//doQuery();
//}

Call a Java Application from MicroFocus COBOL (in UNIX environment)

Hello,
Could you please let me know, how to call a Java application from a MicroFocus COBOL application. If anyone has any code samples, that would be of great help.
Thanks in advance,
Tijo.

You generally can't cause a program to be executed on a different >server. Basic security, you know. Besides this idea of having the Java >application run on a different server wasn't mentioned in your original >post. That leads me to believe we don't have the whole story.So I think you need to step back and find out what are the requirements. For example: Does your program need to start this Java application running, or is it already running and your program needs to connect to it somehow?
My program has to start a Java class file, meaning that the Micro Focus COBOL module will call the Java class file. Will it be running on the same machine as your program, or on some other machine?
For both cases, I would like to know the answer.a) Running on the same machine as my program is running.
b) Running on the different machine.
And then there are the questions about whether your program needs to have a conversation with the Java application, or whether it just needs to start it and that's all.
COBOL program has to call a Java class by passing some parameters and Java class in turn process it and return some value back.. Kind of Request and Response model.Plenty of questions to be asked. Go and find out what they are.
Sorry ... if I am not clear on my questions. Anyhow, thank you very much for providing the information.

Can we call simple a java application from any one of this AS adapters

Can we call a simple java application from any one of this AS adapters?
Prakash
Message was edited by:
user629857

You can achieve this using LiveCycle PDF Generator JAVA API. You can find required code here:
Adobe LiveCycle * Quick Start (SOAP mode): Converting a Microsoft Word document to a PDF document using the Java API
In parameters:
//Set createPDF2 parameter values
String adobePDFSettings = "Standard";
String securitySettings = "No Security";
String fileTypeSettings = "Standard OCR";
"Standard OCR" file type setting will run OCR on input pdf. In the code, instead of doc file provide a pdf file. Resultant pdf will be searchable PDF i.e OCRed PDF.
Feel feel to ask any further questions.

Calling a java application from j2ee web application

Hi,
I have a j2ee application in which i am making a call to a jar file which is a java application.
Runtime a4 = Runtime.getRuntime();
Runtime a = Runtime.getRuntime();
String cmd[] = new String[14];
cmd[0] = "cmd";
cmd[1] = "/c";
cmd[2] = "start";
cmd[3] = "javaw";
cmd[4] = "-jar";
cmd[5] = CATALINA_HOME+"\\webapps\\AveksaTesting\\AveksaTestingJava\\dist\\AveksaTestingJava.jar";
cmd[6] = SERVER_TESTS;
cmd[7] = COLLECTOR_TESTS;
cmd[8] = SYSTEM_TESTS;
cmd[9] = CREATE_ORACLE;
cmd[10] = DB_NAME;
cmd[11] = DB_DUMP;
cmd[12] = email;
cmd[13] = isMIGRATE;
try{
java.lang.Process p = a.exec(cmd);
Now in the called java application, i am first shutting down the tomcat server by calling shutdown.bat script and then starting it using startup.bat. But the problem i am facing is when i restart the server from java application, it says address already in use(i.e. port 8445 on which tomcat is runninng).
Id i just call the java application and do the same operation it works fine. I guess when i am calling java from j2ee application, j2ee still has some threads holding java and not shutting down tomcat properly.
Can anyone suggest me what can be done in this case. I have to call a java application from j2ee and restart the tomcat server many times.
Thanks in advance
-Vikram

Annoyingly crossposted.
http://forum.java.sun.com/thread.jspa?threadID=730657

Start java application from another programm

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