Runtime.exec child process - C program, I/O blocked???
Hi i'm meeting this interesting problem. I am running a simple C app from a Java app as a child process. I want to read/write both the Input and Output before the child process is finished but especially the output of the C app seems to be bloked before the process is finsished and thus i can not make any dialogue with the app when needed?
Any ideas...., here's the source
try
String[] command={"cmd","/c","prog.exe"};
Runtime rt = Runtime.getRuntime();
Process proc = rt.exec(command);
InputStream stderr = proc.getInputStream();
/*String str="123";
BufferedOutputStream bufStr= (BufferedOutputStream) proc.getOutputStream();
bufStr.write(123);
bufStr.flush();*/
InputStreamReader isr = new InputStreamReader(stderr);
BufferedReader br = new BufferedReader(isr);
String line = null;
while ( (line = br.readLine()) != null)
System.out.println(line);
PrintWriter out = new PrintWriter(new OutputStreamWriter(proc.getOutputStream()), true);
out.write("qwer");
out.flush();
int exitVal = proc.waitFor();
System.out.println("Process exitValue: " + exitVal);
} catch (Throwable t)
Another thing - when it reaches to reading the output of the C app , the execution of main is suspended and it hangs indefinitely....?
thanks a lot , it really bugs me.....
As for
http://www.javaworld.com/javaworld/jw-12-2000/jw-1229-
traps.html?page=4 ,
i have read it a couple of times and digested it:),
tryed a couple of things but i can't say anything
there solves my problem. If you have anything
particular in your mind please, please specifuy or
quote in the post....How can I ! You don't show your latest code and your original code needed changing so that it implemented the guidelines in the reference.
>
And one more thing , i am pretty sure that the
problem is in the fact that the .exe prog blocks its
out stream until finishing, i'm working on why and
how to undo it....Since I don't have access to the source code of your exe and I don't have the source code of your java and I don't have your problem with executing any of my exe files then I can't comment. And, yes my exe files do write to stdin, read from stdout and read from stderr. I also use the same approach with perl and python scripts.
Similar Messages
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Runtime.exec() + getOutputStream() +write+me program=hang
I'm trying to write to the standard input of an external prorgram by using Runtime.exec() and writing to the outputstream of the process it creates. I write to the standard in and then wait for that process to finish using waitFor() but it just hangs there. Is there something special to do before writing the data?
There is nothing funky about my code, it's just basic stuff.
OutputStream out =process.getOutputStream();
out.write(data);
out.flush();
out.close();
process.wairFor();Do you really know
1. That the process got the data and processed it?
2. That the process exited and you are still hanging?
Sorry if I'm just stating the obvious, but is the other process perhaps waiting for an end-of-line or end-of-input?
Finally, you didn't say what the other process technology is, but I've had some surprises when attempting to work between java and other technologies. Example: Other process was LEX, which uses a Windows flag to check for character or block input. Flag was set in a surprising manner when java was the source, and my LEX blocked forever. -
Runtime.exec and ServerSocket for IPC...blocking problems
I have built an IDE for assembling/deploying web applications.
I am supporting a 'test' mode in the IDE where a compiled 'solution/application' is executed in a separate vm from the IDE using Runtime.exec. For the whole sandbox thing. Don't want a wayward application crashing my IDE.
Naturally I want a way to communicate start/stop from the IDE to the running application. So sockets are my only choice. Calling process.destroy from my IDE won't invoke a shutdownhandler in the generated application's vm, and I want an orderly shutdown as the generated applications open resources/etc.
When I execute the generated application from within the IDE the thread code that creates a server socket blocks in the ServerSocket constructor...why?
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Any ideas?I have decided on a different approach.
At first I thought...ok I have the ServerSocket on the wrong 'side'. I then put the ServerSocket code in the always-running IDE and the Socket code on the running/exec'd application. But still a hang on the running application when constructing the Socket.
I decided instead to call Process.destroy on the running app.
Given that generated app is running in a separate vm, when it shuts down via process.destroy from the ide...although vm shutdown hooks aren't called...I guess it's ok since a destroy of the vm will release all resources. Not as clean as I'd like though.
Additionally, I cannot determine 'true' start of application as no socket notification can be done. I merely determine start after a Runtime.exec of jvm process. Subsequent errors in startup will merely be determined by the IDE in process.waitFor or process.exitValue.
I was getting a wierd socket error when attempting my prior solutions...and not a lot on the web regarding this subject...all relevant posts seemed to be in German/from Germany. Odd. Would need my wife to translate! Mein gott!
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Strange problem when a c++ program is triggered by Runtime.exec()
I am working in linux system. I have 2 programs:
1. one is a c++ program e.g. AAA. In this program, i use "system("gcc ...")" to call gcc to do some internal processing
2. the other is a java program BBB. In this program, i use Runtime.exec("AAA") to run program AAA.
case 1
if I run c++ program AAA directly, everything goes well, gcc call via "system" is successful.
case 2
if I run java program BBB to trigger AAA indirectly, the AAA can be executed, but the system call (gcc call inside AAA) is failed.
so, what is wrong? any hints? what is the solution to make case #2 work? I just want to use BBB to trigger AAA, and the system call should also be successful.
thanks in advance for your help!"...but the system call (gcc call inside AAA) is failed."
Isn't terribly descriptive, but I'm guessing that it complains it can't find gcc?
If that's the case then it's because the call to Runtime.exec() runs the code in a shell with no idea where anything is, whereas when you run the C++ code straight it is running in the shell you kicked it off in. Something along those lines anyway.
Someone else'll be able to tell you how to get it to work. I'm sure I've seen this sort of problem here several times. -
I am trying to launch a new java application from my java program like this-:
import java.io.*;
public class test123{
//String userStr="";
public static void main(String args[]) throws Exception{
Process p = Runtime.getRuntime().exec("java JavaExec",null,currentDir);
Thread.sleep(10000);
System.out.println("After Destroy");
} The JavaExec file�s code is -:
import java.io.*;
import org.apache.log4j.Logger;
public class JavaExec
static Logger logger = Logger.getLogger("JavaExec.class");
public static void main(String args[])
try
Runtime runtime = Runtime.getRuntime();
Process process = runtime.exec("notepad");
int exitCode=0;
while(true)
//logger.info("Inside the infinite while loop in javaexec");
try
exitCode = process.exitValue();
System.out.println(exitCode);
process.destroy();
process = runtime.exec("notepad");
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Please let me know the solution to this problem.....
Thanks in Advance
Inder Jeet SinghConvoluted at best. You don't need that loop, just useexitCode = process.exitValue();and it will block until notepad exits.
P.S. Why a Runtime.exec() executing a Java program that does a Runtime.exec() on notepad? -
Hello,
I have built a gui around a stand-alone executable, which is an image processing algorithm, which should be run let us say 10 times, on different images.
Thus when pressing let us say the start-button, the program should be executed.
I can do this by Runtime.getRuntime().exec("thealgo.exe");
This works fine, since the results of the algorithm are succesfully written to disc. Also reading in these results for later use works correctly as well.
Yet I would like to update some parts of my gui, for example putting a label like "processing" or showing the current image being processed.
Yet this doesn't work!! The gui is only updated when all processing is finished, thus only when the loop is finished!!
To show what the problem is:
for (int i=0;i<10;i++)
try
Runtime runtime = Runtime.getRuntime();
String [] toRun={"cmd.exe","start","NBSinVis.exe"};
Process process = runtime.exec(toRun);
process.waitFor();
runtime.freeMemory();
returnVal = process.exitValue();
process.destroy();
catch (IOException ioe)
System.out.println(ioe);
catch (InterruptedException ie)
System.out.println(ie);
jLabel.setText("the new text " + i);
Yet in this case only the last time the label would be updated.
Any ideas??
Thank you in advancethank you for responding. This is what I did:
I replaced the setText method with a method as you wrote:
void updateTest()
javax.swing.SwingUtilities.invokeLater(new Runnable()
public void run()
statusBar.setText("Woohooo..");
so I have the following:
updateTest();
for (int i=0;i<10;i++)
execAlgo(); //using Runtime.exec()
But it gives the same result.
With the Swingworker-class, should I put the execAlgo()-method in a new StringWorker, or every GUI-update in a new SwingWorker?
What already occured, is that I put the execAlgo in a new Thread, but then it starts all 10 algo's at a time, because it doesn't wait for one to finish, which isn't what I want either.
Thank you again -
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UID PID PPID etc
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Runtime.getRuntime().exec() - native process
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Thanx in advanceI guess your implementation of matchIp() is wrong:
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+ "COMMAND: c\n" + "\n" + "QUIT:q\n" + "\n"
+ "135.19.45.18> ").getBytes());
System.out.println(readUntilIpMatch(dummyStrem));
private StringBuilder buffer = new StringBuilder();
protected String readUntilIpMatch(final InputStream in) {
while (true) {
try {
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buffer.append((char) in.read());
Pattern pattern = Pattern
.compile("\\d{1,3}(\\.\\d{1,3}){3}(?=\\D)");
Matcher matcher = pattern.matcher(buffer);
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bye
TPD -
Using Runtime exec() to open and close process like java or javac
Hi, I m a student who is learning IT and is wondering if
Runtime exec() can run and stop commands like java and javac?
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import java.util.*;
import java.io.*;
import javax.swing.*;
import java.awt.event.*;
import java.awt.*;
class StreamGobbler extends Thread
InputStream is;
String type;
StreamGobbler(InputStream is, String type)
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test1 t = new test1();
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Best way to close a Runtime.exec() process and how to handle closing it?
I have multiple Runtime.exec() Processes running and am wondering what the best way it is to close them and take care of closing the resources. I see that Process.destroy() seems to be the way to terminate the Process - is finalize() the best way to close anything in that Process?
ThanksI was involved with your other thread, so I think I know what you are trying to do.
All Dr's answers are correct.
Now you have a program A written by you that does Runtime.exec() of multiple instances
of another program B written by you. You want A to somehow tell B to exit.
You must use some kind of Inter Process Communication. If this is the only interraction
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Solution 1:
Start a thread in B and read stdin. A will write to stdin a command, such as QUIT.
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Solution 2:
Start a SocketServer in B that accepts connections on a separate thread.
When A wants B to exit, it connects to it and writes a command such as QUIT.
When B reads it, it does System.exit().
You may note that QUIT is not the only command you can send from A to B, in case you will need more.
Edited by: baftos on Nov 5, 2007 2:15 PM -
Start a new java process using Runtime.Exec() seems to ignore the -Xmx
I am working with a process that requires a minimum of 1.5 GB to run and works better if more is available.
So I am determining how much memory is available at startup and restarting the jre by calling
Runtime.exec("java -Dcom.sun.management.jmxremote=true -Xmx1500M -jar XXX.jar")
which reinvokes the same process with a new max memory size.
The initial call to the process is
java -Dcom.sun.management.jmxremote=true -Xmx3500M -jar XXX.jar
The initial call returns 3262251008 from Runtime.maxmemory()
When reinvoked through Runtime.exec() as above
Runtime.maxmemory() still returns 3262251008
Is there a way to separate the new process from the size specified by the parent process?That is strange. Here is a program I wrote which calls itself recursively.
import java.io.IOException;
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import java.util.ArrayList;
import static java.util.Arrays.asList;
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readin(p.getInputStream());
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new Thread(new Runnable() {
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byte[] bytes = new byte[1024];
int len;
while((len = in.read(bytes))>0)
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in.close();
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Maximum memory size= 66650112
Maximum memory size= 133234688
Maximum memory size= 99942400
Maximum memory size= 35389440
Maximum memory size= 231014400 -
Spawn a java process using runtime.exec() method
Hi,
This is my first post in this forum. I have a small problem. I am trying to spawn a java process using Runtime.getRuntime().exec() method in Solaris. However, there is no result in this check the follwoing program.
/* Program Starts here */
import java.io.*;
public class Test {
public static void main(String args[]) {
String cmd[] = {"java", "-version"};
Runtime runtime = Runtime.getRuntime();
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Process proc = runtime.exec(cmd);
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/* Program ends here */
There is neither any exception nor any result.
The result I am expecting is it should print the following:
java version "1.4.0"
Java(TM) 2 Runtime Environment, Standard Edition (build 1.4.0-b92)
Java HotSpot(TM) Client VM (build 1.4.0-b92, mixed mode)
Please help me out in this regard
Thanks in advance
Chotu.Yes your right. It is proc.getInputStream() or proc.getErrorStream(). That is what I get for trying to use my memory instead of looking it up. Though hopefully the OP would have seen the return type of the other methods and figured it out.
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Process proc=runtime.exec("sh","-c","//home//usr//mkdir abcd") not working
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I also have this error
I use Tomcat 4.0 and Window Me
Do u think that the problem is "Window OS" or Tomcat Setting
I have a problem. I want to complie the other Java Program "hi.java" using servlet.
I am compiling the servlet code succesfully, but the web page can't display anything.
The real path of "hi.java" is in the
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This is my servlet code..............pls help.............thx!
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import javax.servlet.http.*;
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I have a program that does the following:
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What can i do to get the socket to close?
I even tried to explicity call close() on it, and that didn't work. Any ideas would be great.
I am running this on WindowsXP using netstat to monitor the port utilization.
here is some sample code
import java.io.*;
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public class ForkTest
public static void main(String[] args)
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at java.net.PlainDatagramSocketImpl.bind(Native Method)
at java.net.DatagramSocket.bind(DatagramSocket.java:368)
at java.net.DatagramSocket.<init>(DatagramSocket.java:210)
at java.net.DatagramSocket.<init>(DatagramSocket.java:261)
at java.net.DatagramSocket.<init>(DatagramSocket.java:234)
at ForkTest.main(ForkTest.java:11)
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