Runtime.getRuntime().exec(Command) problems...

hi, i am trying to run a NET USE command through using:
Runtime.getRuntime().exec(Command);
where Command is a valid NET USE command. I know it is valid because i executed this exact command
from the command line and it worked fine. This class works perfectly under Windows, but then i took it to an
OS/2 environment and i am getting this error. Does anybody know what i need to do to modify so it will work
under OS/2? any gotchas? thanks

i read that article, and there is a lot to go over. I will start that right now. Anyways, i got the actual stack trace
from this error:
at java.lang.Win32Process.create(Native Method)
at java.lang.Win32Process.<init>(Win32Process.java:67)
at java.lang.Runtime.execInternal(Native Method)
at java.lang.Runtime.exec(Runtime.java:566)
at java.lang.Runtime.exec(Runtime.java:428)
at java.lang.Runtime.exec(Runtime.java:364)
at java.lang.Runtime.exec(Runtime.java:326)
at ReconnectReportServer.run(ReportServer.java:499)
at java.lang.Thread.run(Thread.java:536)
and, once again, i am running this on OS/2. I compiled it on OS/2 as well. Any ideas? thanks!

Similar Messages

Strange behaviour of Runtime.getRuntime().exec(command)

hello guys,
i wrote a program which executes some commands in commandline (actually tried multiple stuff.)
what did i try?
open "cmd.exe" manually (administrator)
type "echo %PROCESSOR_ARCHITECTURE%" and hit enter, which returns me
"AMD64"
type "java -version" and hit enter, which returns me:
"java version "1.6.0_10-beta"
Java(TM) SE Runtime Environment (build 1.6.0_10-beta-b25)
Java HotSpot(TM) 64-Bit Server VM (build 11.0-b12, mixed mode)"
type "reg query "HKLM\SOFTWARE\7-zip"" returns me:
HKEY_LOCAL_MACHINE\SOFTWARE\7-zip
Path REG_SZ C:\Program Files\7-Zip\
i wrote two functions to execute an command
1) simply calls exec and reads errin and stdout from the process started:
public static String execute(String command) {
          String result = "";
          try {
               // Execute a command
               Process child = Runtime.getRuntime().exec(command);
               // Read from an input stream
               InputStream in = child.getInputStream();
               int c;
               while ((c = in.read()) != -1) {
                    result += ((char) c);
               in.close();
               in = child.getErrorStream();
               while ((c = in.read()) != -1) {
                    result += ((char) c);
               in.close();
          } catch (IOException e) {
          return result;
     }the second function allows me to send multiple commands to the cmd
public static String exec(String[] commands) {
          String line;
          String result = "";
          OutputStream stdin = null;
          InputStream stderr = null;
          InputStream stdout = null;
          // launch EXE and grab stdin/stdout and stderr
          try {
               Process process;
               process = Runtime.getRuntime().exec("cmd.exe");
               stdin = process.getOutputStream();
               stderr = process.getErrorStream();
               stdout = process.getInputStream();
               // "write" the parms into stdin
               for (int i = 0; i < commands.length; i++) {
                    line = commands[i] + "\n";
                    stdin.write(line.getBytes());
                    stdin.flush();
               stdin.close();
               // clean up if any output in stdout
               BufferedReader brCleanUp = new BufferedReader(
                         new InputStreamReader(stdout));
               while ((line = brCleanUp.readLine()) != null) {
                    result += line + "\n";
               brCleanUp.close();
               // clean up if any output in stderr
               brCleanUp = new BufferedReader(new InputStreamReader(stderr));
               while ((line = brCleanUp.readLine()) != null) {
                    result += "ERR: " + line + "\n";
               brCleanUp.close();
          } catch (IOException e) {
               // TODO Auto-generated catch block
               e.printStackTrace();
          return result;
     }so i try to execute the commands from above (yes, i am using \\ and \" in java)
(1) "echo %PROCESSOR_ARCHITECTURE%"
(2) "java -version"
(3) "reg query "HKLM\SOFTWARE\7-zip""
the first function returns me (note that ALL results are different from the stuff above!):
(1) "" <-- empty ?!
(2) java version "1.6.0_11"
Java(TM) SE Runtime Environment (build 1.6.0_11-b03)
Java HotSpot(TM) Client VM (build 11.0-b16, mixed mode, sharing)
(3) ERROR: The system was unable to find the specified registry key or value.
the second function returns me:
(1) x86 <-- huh? i have AMD64
(2) java version "1.6.0_11"
Java(TM) SE Runtime Environment (build 1.6.0_11-b03)
Java HotSpot(TM) Client VM (build 11.0-b16, mixed mode, sharing)
(3) ERROR: The system was unable to find the specified registry key or value.
horray! in this version the java version is correct! processor architecture is not empty but totally incorrect and the reg query is still err.
any help is wellcome
note: i only put stuff here, which returns me strange behaviour, most things are working correct with my functions (using the Runtime.getRuntime().exec(command); code)
note2: "reg query "HKLM\HARDWARE\DESCRIPTION\System\CentralProcessor\0" /t REG_SZ" IS working, so why are "some" queries result in ERR, while they are working if typed by hand in cmd.exe?

ok, i exported a jar file and execute it from cmd:
java -jar myjar.jar
now the output is:
(1) "" if called by version 1, possible to retrieve by version 2 (no clue why!)
(2) "java version "1.6.0_10-beta"
Java(TM) SE Runtime Environment (build 1.6.0_10-beta-b25)
Java HotSpot(TM) 64-Bit Server VM (build 11.0-b12, mixed mode)"
(3) C:\Program Files\7-Zip\
so all three problems are gone! (but its a hard way, as i need both functions and parse a lot of text... :/ )
thanks for the tip, that eclipse changes variables (i really did not knew this one...)

Runtime.getRuntime().exec portability problem

Hello everyone!
I've got a problem with running external application (in my case it's pdfLaTeX). The code looks as follows:
System.out.println(AppConfig.getExeFile() + " " + params); // AppConfig.getExeFile() is a static function that outputs a String object.
Process p = Runtime.getRuntime().exec(AppConfig.getExeFile() + " " + params); // params is a String object as well.
p.waitFor();
// ...On Linux everything works great. System.out.println() outputs the following line:
/opt/texlive/bin/pdflatex -halt-on-error -output-directory /tmp /tmp/tabular.texThe application executes successfully.
However, I can't get my program to run on Windows. In this case, the generated command looks as follows:
"C:\Program Files\LaTeX\MiKTeX 2.7\miktex\bin\pdflatex.exe" -halt-on-error -output-directory C:\DOCUME~1\Roman\USTAWI~1\Temp C:\DOCUME~1\Roman\USTAWI~1\Temp\tabular.texAfter displaying this line, my application freezes. The child process (pdflatex.exe) is frozen as well. Then I kill both processes.
Here's the PdfLaTeX's log file after failure:
{C:/Documents and Settings/All Users/Dane aplikacji/MiKTeX/2.7/pdftex/config/pd
ftex.map}
!pdfTeX error: (file C:/Documents and Settings/All Users/Dane aplikacji/MiKTeX
/2.7/pdftex/config/pdftex.map): fflush() failed
==> Fatal error occurred, no output PDF file produced!and here's how it should look like:
{C:/Documents and Settings/All Users/Dane aplikacji/MiKTeX/2.7/pdftex/config/pd
ftex.map}] (tabular.aux) )
Here is how much of TeX's memory you used:
202 strings out of 95340
2116 string characters out of 1183965
46926 words of memory out of 1500000
3474 multiletter control sequences out of 110000
3640 words of font info for 14 fonts, out of 1200000 for 2000
14 hyphenation exceptions out of 8191
23i,6n,17p,173b,100s stack positions out of 5000i,500n,10000p,200000b,5000s
<C:/Program Files/LaTeX/MiKTeX 2.7/fonts/type1/bluesk
y/cm/cmr10.pfb>
Output written on tabular.pdf (1 page, 10003 bytes).
PDF statistics:
10 PDF objects out of 1000 (max. 8388607)
0 named destinations out of 1000 (max. 131072)
1 words of extra memory for PDF output out of 10000 (max. 10000000)I suspected that the problem was caused by presence of spaces in command (I've tried several other solutions such as putting parameters into String[] array, escaping, adding double-quotes, putting the command to the batch file), but when I run my the same command from the command line, everything works fine.
I believe that I'm making some kind of a stupid mistake because it doesn't look like it's pdfLaTeX's fault.
Thanks in advance for your hints. Solutions are welcome as well ;-)

Hi,
What is probably happening is that the process is being blocked because you are not reading the output.
This is a common problem with exec.
Read this article:
http://www.javaworld.com/javaworld/jw-12-2000/jw-1229-traps.html
HTH,
Eugenio Alvarez

Runtime.getRuntime().exec(command)

I have to exec the keytool command from a server:
MY CODE:
String cmd = new String("/usr/local/j2sdkee/bin/keytool -genkey -dname \"cn="+nome+" "+cognome+", ou="+lavoro+", o="+impresa+", c="+stato+"\" -alias cert -keypass keypass -keystore /usr/local/server4/keystore/"+userid+" -storepass storepass -validity 180");
System.out.println("cmd = "+cmd);
Runtime rt = java.lang.Runtime.getRuntime();
Process ksGenerator = null;
ksGenerator = rt.exec(cmd);
ksGenerator.waitFor();
System.out.println("exitValue "+ksGenerator.exitValue());
PROBLEM:
The exit Value is correct (=0) and there isn't any exception .... but the command didn't work...
If i try to exec the command from shell it work.
How can i do???
THANKS

Someone in another forum suggested that one should ALWAYS use the exec command that takes an array of arguments, rather than a single string.

PROBLEM in executing a shell command through Runtime.getRuntime().exec()

Hi all,
I was trying to execute the following code:
import java.io.BufferedReader;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.sql.CallableStatement;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.Statement;
import java.sql.ResultSet;
* Created on Mar 13, 2007
* To change the template for this generated file go to
* Window>Preferences>Java>Code Generation>Code and Comments
* @author 195092
* To change the template for this generated type comment go to
* Window>Preferences>Java>Code Generation>Code and Comments
public class ClassReportDeleteDaemon {
     ClassReportDeleteDaemon()
     public static void main(String[] args) throws Exception
          Connection conn = null;
          Statement stmt = null;
          ResultSet rs;
          String strQuery = null;
          String strdaysback = null;
          String delstring = null;
          int daysback;
          try
               System.out.println("REPORT DELETION ::: FINDING DRIVER");
               Class.forName("oracle.jdbc.driver.OracleDriver");
          catch(Exception e)
               System.out.println("REPORT DELETION ::: DRIVER EXCEPTION--" + e.getMessage());
               System.out.println("REPORT DELETION ::: DRIVER NOT FOUND");
          try
               String strUrl = "jdbc:Oracle:thin:" + args[0] + "/" + args[1] + "@" + args[2];
               System.out.println("REPORT DELETION ::: TRYING FOR JDBC CONNECTION");
               conn = DriverManager.getConnection(strUrl);
               System.out.println("REPORT DELETION ::: SUCCESSFUL CONNECTION");
               while(true)
                    System.out.println("WHILE LOOP");
                    stmt = conn.createStatement();
                    strQuery = "SELECT REP_DAYS_OLD FROM T_REPORT_DEL";
                    rs = stmt.executeQuery(strQuery);
                    while(rs.next())
                         strdaysback = rs.getString("REP_DAYS_OLD");
                         //daysback = Integer.parseInt(strdaysback);
                    System.out.print("NO of Days===>" + strdaysback);
                    delstring = "find /tmp/reports1 -name " + "\"" + "*" + "\"" + " -mtime +" + strdaysback + " -print|xargs rm -r";
                    System.out.println("DELETE STRING===>" + delstring);
                    Process proc = Runtime.getRuntime().exec(delstring);
                    //Get error stream to display error messages encountered during execution of command
                    InputStream errStream=proc.getErrorStream();
                    //Get error stream to display output messages encountered during execution of command
                    InputStream inStream = proc.getInputStream();
                    InputStreamReader strReader = new InputStreamReader(errStream);
                    BufferedReader br = new BufferedReader(strReader);
                    String strLine = null;
                    while((strLine=br.readLine())!=null)
                         System.out.println(strLine);
               }     //end of while loop
          }     //end of try
          catch (Exception e)
               System.out.println("REPORT DELETION ::: EXCEPTION---" + e.getMessage());
               conn.close();
     }     //end of main
}     //end of ClassReportDeleteDaemon
But it is giving the error "BAD OPTION -print|xargs". The command run well in shell.
Please help.
Thanking u.......

Since the pipe '|' is interpreted by the shell then you need the shell to invoke your command
        String[] command = {"sh","-c","find /tmp/reports1 -name " + "\"" + "*" + "\"" + " -mtime +" + strdaysback + " -print|xargs rm -r"};
        final Process process = Runtime.getRuntime().exec(command);
You should also read http://www.javaworld.com/javaworld/jw-12-2000/jw-1229-traps.html at least twice and implement the recommendation regarding stdout and stderr.
P.S. Why are you not using Java to find and delete these files?
Message was edited by:
sabre150

Running curl command from a java program using Runtime.getRuntime.exec

for some reason my curl command does not run when I run it from within my java program and errors out with "https protocol not supported". This same curl command however runs fine from any directory on my red hat linux system.
To debug the problem, I printed my curl command from the java program before calling Runtime.getRuntime.exec command and then used this o/p to run from the command line and it runs fine.
I am not using libcurl or anything else, I am running a simple curl command as a command line utility from inside a Java program.
Any ideas on why this might be happening?

thanks a lot for your response. The reason why I am using curl is because I need to use certificates and keys to gain access to the internal server. So I use curl "<url> --cert <path to the certificate>" --key "<path to the key>". If you don't mid could you please tell me which version of curl you are using.
I am using 7.15 in my system.
Below is the code which errors out.
public int execCurlCmd(String command)
          String s = null;
          try {
              // run the Unix "ps -ef" command
                 Process p = Runtime.getRuntime().exec(command);
                 BufferedReader stdInput = new BufferedReader(new
                      InputStreamReader(p.getInputStream()));
                 BufferedReader stdError = new BufferedReader(new
                      InputStreamReader(p.getErrorStream()));
                 // read the output from the command
                 System.out.println("Here is the standard output of the command:\n");
                 while ((s = stdInput.readLine()) != null) {
                     System.out.println(s);
                 // read any errors from the attempted command
                 System.out.println("Here is the standard error of the command (if any):\n");
                 while ((s = stdError.readLine()) != null) {
                     System.out.println(s);
                 return(0);
             catch (IOException e) {
                 System.out.println("exception happened - here's what I know: ");
                 e.printStackTrace();
                 return(-1);
     }

Runtime.getRuntime().exec problems

i am trying to run files from my java application, i use the following command
Runtime.getRuntime().exec("cmd /c start " + filePath);but it seems that it cant handle file path with spaces, like
C:\Documents and Settings\Administrator\My Documents\My Web\Untitled-3.fla
it works well with path like this
C:\Downloads\1.rar
am i right? and how to solve this problem? thanks

        final String[] command =
            "cmd.exe",
            "/C",
            "start \"" + filename + "\"",
        final Process p = Runtime.getRuntime().exec(command);this method can only trigger files in the same folder as the java application, isnt it?

Problem with Runtime.getRuntime().exec

Hi ,
i'm using jBuilderX and windows 2000 server . My problem is that i can't
find why
in my code it doesn't work this:
import java.lang.*;
String command = new String("c:\\testd\\testf.bat"); // testf.bat -
batch file
Runtime.getRuntime().exec(command); // it doesn't
have any effect
Thanks in advance,

What's it supposed to do?
I can definitely help you on this 1, but I'd really like to see your streamoutputs. You can get these from the Process object that is created, but you'll need to add some threaded listeners to get the data.
Is this possible?

Runtime.getRuntime().exec works on windows failed on linux!

Hi,
I'm trying to execute a linux command from java 1.4.2 using Runtime.getRuntime().exec(). The linux command produces output and write to a file in my home dir. The command runs interactively in the shell and also run on windows.
The command is actually a mozilla pk12util. My java code to run this pk12util works on windows, but not on linux (fedora). When I print out the command I'm trying to run in java, I can run it interactively in bash shell.
Method below is where the problem seems to be:
public void writeCert() {
// Declaring variables
System.out.println("Entering writeCert method");
String command = null;
certFile = new File(credFileName);
// building the command for either Linux or Windows
if (System.getProperty("os.name").equals("Linux")) {
command = linuxPathPrefix + File.separator + "pk12util -o "
+ credFileName + " -n \"" + nickName + "\" -d "
+ dbDirectory + " -K " + slotpw + " -w " + slotpw + " -W "
+ pk12pw;
System.out.println("System type is linux.");
System.out.println("Command is: " + command);
if (System.getProperty("os.name").indexOf("Windows") != -1) {
// command = pk12utilLoc + File.separator + "pk12util -o
// "+credFileName+" -n "\"+nickname+\"" -d \""+dbDirectory+"\" -K
// "+pk12pw+" -w "+pk12pw+" -W "+pk12pw;
command = pk12utilLoc + File.separator + "pk12util.exe -o "
+ credFileName + " -n \"" + nickName + "\" -d "
+ dbDirectory + " -K " + slotpw + " -w " + slotpw + " -W "
+ pk12pw;
System.out.println("System type is windows.");
System.out.println("Command is: " + command);
// If the system is neither Linux or Windows, throw exception
if (command == null) {
System.out.println("command equals null");
try {
throw new Exception("Can't identify OS");
} catch (Exception e) {
System.out.println(e.getMessage());
e.printStackTrace();
// Having built the command, running it with Runtime.exec
File f = new File(credFileName);
// setting up process, getting readers and writers
Process extraction = null;
BufferedOutputStream writeCred = null;
// executing command - note -o option does not create output
// file, or write anything to it, for Linux
try {
extraction = Runtime.getRuntime().exec(command);
} catch (IOException e) {
System.out.println(e.getMessage());
e.printStackTrace();
// Dealing with the the output of the command; think -o
// option in command should just write the credential but dealing with output anyway
BufferedWriter CredentialOut = null;
OutputStream line;
try {
CredentialOut = new BufferedWriter (
new OutputStreamWriter(
new FileOutputStream(credFileName)));
catch (FileNotFoundException e) {
System.out.println(e.getMessage());
e.printStackTrace();
// writing out the output; currently having problems because I am trying to run
}

My error is due to the nickname "-n <nickname" parameter error. I think the problem is having a double quotes around my nickname, but if I take out the double quotes around my nickname "Jana Test's ID" won't work either because there are spaces between the String. Error below:
Command is: /usr/bin/pk12util -o jtest.p12 -n "Jana Test's Development ID" -d /home/jnguyen/.mozilla/firefox/zdpsq44v.default -K test123 -w test123 -W test123
Read from standard outputStreamjava.io.PrintStream@19821f
Read from error stream: "pk12util: find user certs from nickname failed: security library: bad database."
null
java.lang.NullPointerException
at ExtractCert.writeCert(ExtractCert.java:260)
at ExtractCert.main(ExtractCert.java:302)
Code is:
private String nickName = null;
private void setNickname(String nicknameIn) {
nickName = nicknameIn;
// building the command for either Linux or Windows
if (System.getProperty("os.name").equals("Linux")) {
command = linuxPathPrefix + File.separator + "pk12util -o " + credFileName + " -n \"" + nickName + "\" -d " + dbDirectory + " -K " + slotpw + " -w " + slotpw + " -W " + pk12pw;
System.out.println("System type is linux.");
System.out.println("Command is: " + command);
extraction = Runtime.getRuntime().exec(command);
BufferedReader br = new BufferedReader(
new
InputStreamReader(extraction.getErrorStream()));
PrintStream p = new PrintStream(extraction.getOutputStream());
System.out.println("Read from standard outputStream" + p);

Runtime.getRuntime().exec - relies on the J2RE?

Well here is a problem...
My program works fine using the Runtime.getRuntime().exec command, and the program works as-intended on my computer. But that's because I have the latest and greatest Java apparel (especially the J2RE).
Now, a friend of mine who does not program, took my program and tried it on his computer. It worked (the GUI loaded and buttons functioned) but it didn't actually do anything other than serve as a nice-looking GUI lol.
The problem was, it was creating the file I had it create (using FileWriter) but it wasn't EXECUTING that file like I designed the program to.
I used the Runtime.getRuntime().exec to execute the file - my question is, if the person doesn't have the Java Runtime Environment, will that command work? He clearly has Java on his computer (the GUI loaded) but he might not have the J2RE...
Any thoughts? Any suggestions for an alternative way to execute a file?
Thanks!
-Josh

I don't understand why this wont work on other
people's computers...
I create the file "commands.bat" in their C:\
directory. I then have the following command to
execute it:
Runtime.getRuntime().exec("cmd.exe /c
\"C:\\crasher.bat\"");It works perfect for me... But it doesn't work for
other people. For other people, it creates the batch
file in the right place, it just wont execute it and
I am not sure why...
-JoshYou said "commands.bat" but your code is executing "crasher.bat". I have the feeling you're trying to crash their computers or something?
cmd.exe is an executable on certain flavors of Windows. Other flavors of Windows have command.exe, not cmd.exe. So you have to pick the same platform, or make the actual command that you execute be dynamic (read it from a property file to determine what to execute).
Go to those other machines and see if you can execute that same command from the command line. Do some debugging for pete's sake.

Runtime.getRuntime.exec() may hang?

Hi, I am trying to run a Microsoft application, suspend.exe, under Java, on xp. I noticed that sometimes the program would hang, after issuing the command.
String command = "cmd /c suspend.exe -n 15 -s 3 -l c:\\scpt\\s3.txt -e " ;
suspend = Runtime.getRuntime().exec (command);
Is there a compatibility between MS and Java after Java releases the control to the native environment? Has anyone seen this? Sometimes this gets kicked off, and sometimes it doesn't.
* I am really confused. Thanks for any help

thank you, I will look into this.
Btw, do you know how to start a java program at start up? I have searched and read some articles, but none seems to do the trick for me.
I have:
1) create a bat file. This bat file runs fine w/ double clicking, but when trying to place it in startup folder and run it, it quits.
2) create a simple c vesion of .exe file. This possesses the same behavior as above
3) create a short cut to the bat file and place it in startup folder. Nothing happens.
4) add reg. key in regedit with
'java Pclient'
and
'java c:\scpt\Pclient'
nothing seems to happen.
still searching...
thank you.

Runtime.getRuntime().exec() does not return

Hello,
I am running into a case where the call to Runtime.getRuntime.exec(command) does not return. The scenario is that the main thread spawns another thread which calls the Runtime.exec(). Since the call does not return, both threads seems to be hung. The jstack output from the main thread shows
----------------- t@2 -----------------
0xfeedab45 ___lwp_cond_wait + 0x15
0xfeb4030d void os::PlatformEvent::park() + 0xa9
0xfebadd48 void ObjectMonitor::wait(long long,bool,Thread*) + 0x26c
0xfe770287 void ObjectSynchronizer::wait(Handle,long long,Thread*) + 0xef
0xfe76ffbb JVM_MonitorWait + 0x20f
0xfb20a032 * java.lang.Object.wait(long) bci:0 (Interpreted frame)
0xfb20308d * java.lang.Thread.join(long) bci:38 line:1143 (Interpreted frame)
0xfb20308d * java.lang.Thread.join() bci:2 line:1196 (Interpreted frame)
0xfb20308d * DataLoader.checkThreadGroup() bci:92 line:316 (Interpreted frame)
0xfb202f27 * DataLoader.checkTables(int) bci:1 line:336 (Interpreted frame)
0xfb202f69 * DataLoader.runLoad(int, java.lang.String, java.lang.String, java.lang.String, com.sabre.fltsked.apm.util.FSIOHelper)
... more below ....
So it is waiting for the spawned thread on a join()
And the jstack dump for the thread that called exec() is
----------------- t@70 -----------------
0xfeed7409 __lwp_park + 0x19
0xfeed1be7 cond_wait_queue + 0x5e
0xfeed1f64 cond_wait_common + 0x1db
0xfeed20d2 condwait + 0x7b
0xfeed20fd cond_wait + 0x21
0xfeed2136 pthread_cond_wait + 0x1b
0x9741082a soft_delete_object_cleanup + 0x57
0x97410906 soft_delete_object + 0x5b
0x97410953 soft_delete_all_objects_in_session + 0x2e
0x97407b7a soft_delete_session + 0xec
0x97407860 soft_delete_all_sessions + 0x3c
0x97402525 finalize_common + 0x66
0x974026ae softtoken_fini + 0x34
0x974355f9 _fini + 0x21
0xfefdd49a remove_hdl + 0x766
0xfefd8be9 dlclose_core + 0xb1
0xfefd8c1d dlclose_intn + 0x21
0xfefd8c96 dlclose_check + 0x2a
0xfefd8d00 dlclose + 0x38
0x97480aeb pkcs11_slottable_delete + 0xb1
0x9747c691 finalize_common + 0xe2
0x9747c6e0 pkcs11_fini + 0x3e
0x9747c3bf pkcs11_fork_child + 0x73
0xfee628b8 postforkchild_handler + 0x2f
0xfeeca9ec fork + 0x12e
0xfe338029 Java_java_lang_UNIXProcess_forkAndExec + 0x395
0xfb20a032 * java.lang.UNIXProcess.forkAndExec(byte[], byte[], int, byte[], int, byte[], boolean, java.io.FileDescriptor, java.io.FileDescriptor, java.io.FileDescriptor) bci
:0 (Interpreted frame)
0xfb202f69 * java.lang.UNIXProcess.<init>(byte[], byte[], int, byte[], int, byte[], boolean) bci:62 line:53 (Interpreted frame)
0xfb20308d * java.lang.ProcessImpl.start(java.lang.String[], java.util.Map, java.lang.String, boolean) bci:182 line:65 (Interpreted frame)
0xfb202f27 * java.lang.ProcessBuilder.start() bci:112 line:452 (Interpreted frame)
0xfb202f27 * java.lang.Runtime.exec(java.lang.String[], java.lang.String[], java.io.File) bci:16 line:593 (Interpreted frame)
0xfb202f27 * java.lang.Runtime.exec(java.lang.String, java.lang.String[], java.io.File) bci:69 line:431 (Interpreted frame)
0xfb202f27 * java.lang.Runtime.exec(java.lang.String) bci:4 line:328 (Interpreted frame)
0xfb202f27 *SQLLoad(java.lang.StringBuffer) bci:181 line:51 (Interpreted frame)
0xfb202e61 *FSLoadThread.run() bci:84 line:54 (Interpreted frame)
The command I am trying to exec is "sqlldr" and I do have it in my PATH variable. Why is that the call to exec does not return? Any ideas?
This is on jdk1.6.0_17
Thanks,
Bijoy.

It has definitely forked, and this is the child process. It says so. If it was the parent process it would just show Java code related to launching processes. That does not involve PKCS11. After the fork there are two identical processes with the same stack: the child process of the fork goes on to replace itself with the target command via Unix exec(), which it doesn't look like it is succeeding at. The parent process doesn't do much at all, probably just housekeeping and then a Unix wait() for Process.waitFor() to hook into.

Runtime.getruntime.exec() getOutputStream()

Hi,
can anyone tell me what this is used for?
i though i maybe could use it in this example
exec(cmd /c start)
out.write("dir".getBytes());
but that doesn't seem to work?
also does anyone know like if i want to start a cmd and want to keep that open and do multiple commands like first cd then dir
i thought u could with the ouputstream, but that isn't right? or am i wrong?
thanks in advance

You need something like
       String[] command =
            "cmd",
        Process p = Runtime.getRuntime().exec(command);
        new Thread(new SyncPipe(p.getErrorStream(), System.err)).start();
        new Thread(new SyncPipe(p.getInputStream(), System.out)).start();
        PrintWriter stdin = new PrintWriter(p.getOutputStream());
        stdin.println("dir c:\\ /A /Q");
        // write any other commands you want here
        stdin.close();
        int returnCode = p.waitFor();
        System.out.println("Return code = " + returnCode);where SyncPipe is a runnable in which the run() method copies the content of the InputStream to the OutputStream. You can use StreamGobbler instead.
Note - commands sent to the stdin of cmd.exe need to be terminated by a new line. When you have finished all input you should close stdin.
Note 1 - since the string "dir c:\\ /A /Q") is interpreted by cmd.exe you MUST use the \ char as a file separator.

Using Process Runtime.getRuntime().exec

http://im1.shutterfly.com/procserv/47b4d633b3127cceb46774c84ee80000001610
Here is a URL to a part of the current process I need to run. Actually there are 4 steps that preceed these but they are ran in order and must be done before these (that part is easy). Sorry it kinda chopped off the left side a little bit.
My question is, can I do this entirely using Runtime.getRuntime().exec() commands or do I need to involve multi threading. The reason I am asking is because P13 cannot run until P8 and P9 completes, but that shouldn't stop the rest of the program from running.
If I have something like
Process P4 = Runtime.getRuntime().exec(P4);
Process P5 = Runtime.getRuntime().exec(P2);
// Some handling for the streams of these processes goes here
P4.waitFor();
P2.waitFor();
if(P2.exitValue() != 0){
Process P5 = Runtime.getRuntime().exec(P5);
Process P6 = Runtime.getRuntime().exec(P6);
// Some handling for the streams of these processes goes here
Does that mean the whole program will stop and wait until P4 is done before even checking for P2? If P2 is finished would the program continue and run P5 and P6 even if P4 is still running or will it wait for P4 to complete also. P4 has nothing to do with P2?
Also any advice ???

P4 and P2 will both be running in parallel (or as much as your OS and hardware allows them to be). As soon as both are done, and regardless of which finishes first, whatever follows P2.waitFor() will execute.
If you have multiple groups of processes, where the processes within a group must execute sequentially, but the groups themselves can run independently of each other, then you'll need to either use Java's threads, or wrap each group of sequential processes in a shell script or batch file the executes that group sequentially.
If there are complex dependencies among the groups--that is, multiple groups must wait on the same process, or one group must wait for multiple other groups, then it might be easier to control the concurrency in Java.

Runtime.getRuntime().exec(...) problems and exit codes

Hi,
I am trying to launch an application 4 times with different arguments from a Java app. I have tried doing it sequentially and in four different threads, but the results are the same: sometimes the 4 of them are properly launched, sometimes (the most of the times) only 3 are launched and sometimes only 2. I have tried with cmd and cmdarray[] as parameters for exec but the results are the same.
This is one of the four threads I use:
Runnable r1 = new Runnable(){
                    public void run(){
                         String ecgCommand = "./flute -S -m:" + Config.ECGS_FLUTE_IP + " -p:" + Config.ECGS_FLUTE_PORT + " -F:" + Config.ECGS + " -r:" + Config.ECGS_FLUTE_RATE + " -C";
                         System.out.println(ecgCommand);
                         InputStream ecgsStream = null;
                         InputStreamReader isr = null;
                         BufferedReader br = null;
                         try{
                              ecgsProcess = Runtime.getRuntime().exec(ecgCommand, null, new File(Config.HOME_PATH + Config.FLUTE_PATH));
                              String line;
                              ecgsStream = ecgsProcess.getInputStream();
                              isr = new InputStreamReader(ecgsStream);
                              br = new BufferedReader(isr);
                              StyledDocument styleDoc = mm.ecgFluteMessages.getStyledDocument();
                              Style def = StyleContext.getDefaultStyleContext().getStyle(StyleContext.DEFAULT_STYLE);
                              while((line = br.readLine()) != null && running){
                                   if(styleDoc.getLength() > 25000)     mm.ecgFluteMessages.setText("");
                                   styleDoc.insertString(styleDoc.getLength(), line+ "\n", def);
                                   mm.ecgFluteMessages.setCaretPosition(mm.ecgFluteMessages.getDocument().getLength());
                              System.out.println(ecgsProcess.waitFor());
                         }catch(Exception e){
                              try {
                                   br.close();
                                   isr.close();
                                   ecgsStream.close();
                              } catch (Exception e1) {
                                   e.printStackTrace();
               new Thread(r1).start();Adding a Thread.sleep between runnables doesn't have any effect.
In addition, those processes that are not properly launched return an exit value of 255. I have searched for its meaning but I have found nothing. Could anybody tell me where can I find a list of the JVM exit codes in order to guess what is happening?
Can anybody help me with this issue? Help is much appreciated.
Thanks a lot

I have been looking for it but it seems it has not any exit code list or any documentation regarding this. Anyway, I think 255 is a JVM error code (the last one, errors are numbered in modulo 256) which means that the error has nothing to do with JVM but with the application execution (flute in my case).
I have added a prompt for the errorStream and I have this message for the 255 exited programs:
not well-formed (invalid token) at line 15+
And the four commands are like this:
*./flute -S -m:239.255.255.253 -p:60102 -F:./ecgs -r:150 -C*
*./flute -S -m:239.255.255.252 -p:60103 -F:./ads -r:150 -C*
*./flute -S -m:239.255.255.251 -p:60104 -F:./pushvod -r:50 -C*
*./flute -S -m:239.255.255.250 -p:60105 -F:./banners -r:150 -C*
So, as the process is sometimes initialized properly and others it is not, it seems that there is a problem with the tokenizing of the command not happening always. As I have tried it with a single command line and with an array of command strings (the first for "./flute" and the followings for each argument) with the same results I can't understand why is this problem happening sometimes. Happening always would help me in giving a clue but that's not the case.
Any idea? Thanks a lot.
Edited by: dulceangustia on Apr 3, 2008 3:41 AM

Runtime.getRuntime().exec(Command) problems...

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