Runtime.exec() on a server

Hi there,
I am just wondering if it is possible to have a servlet call runtime.exec() on the server side computer to start up a new process. Thanks.

Yes it can.

Similar Messages

Runtime.exec() in Java not working in Oracle 10 Application Server

Hi ,
I am trying to call a .exe file which is in the Web Application folder .
I am Using Process p = Runtime.exec("path to .exe file ")
This code is working fine when used with JBOSS , but not working with Oracle Application server .
Please tell me whether i need to do any chnages to make it work
Thanks in advance .

I ran a quick test with your code, I just had to make some small changes, and things work for me...
I'm testing with JDeveloper 10g 10.1.3.2.0 ...
The only thing I wonder is DBUser DBPass DBHost, those are not the actual values, correct?, neither they are environment variables?...
In the server hosting your OAS, you should try running the whole CMD line from the start/run dialog ... make sure it works in that server ...
Here is the code used in my test:
In JSP:
<%@ page import="runexepkg.*" %>
<%
String msg = "";
try
RunEXE p = new RunEXE();
msg = p.main1();
catch(Throwable t)
     System.out.println("Exception Raised");
     t.printStackTrace();
%>
<%= msg %>In Java Class:
package runexepkg;
import java.sql.*;
public class RunEXE
    String ss="";
    public String main1()
    try
        Runtime rt=Runtime.getRuntime();
        Process p = rt.exec("CMD /C start C:\\oraappserver\\j2ee\\WebGis\\applications\\PowerGis\\web\\WEB-INF\\classes\\GisProject\\cust_data_1.exe DBUser DBPass DBHost");
        System.out.println("Command has been executed");
        Class.forName("oracle.jdbc.driver.OracleDriver");
        Connection con = DriverManager.getConnection("jdbc:oracle:thin:@DBHost:DBPort:orcl","DBUser","DBPass");
        System.out.println("Test Connection ========== "+con);
        Statement st = con.createStatement();
        ResultSet rs = st.executeQuery("SELECT SYSDATE FROM DUAL");
        if(rs.next())
            ss="Command has been executed - Database has been accessed";
        else
            ss="Command has been executed - Database was not accessed";
    catch(Throwable t)
        System.out.println("Exception raised, command has NOT been executed");
        ss="Exception raised, command has NOT been executed";
        t.printStackTrace();
    return ss;
}Edited by: Rodolfo Ferrari on Jul 23, 2009 10:40 PM

How do I copy a file to a remote server using runtime exec - plz Help!

Hi,
I am trying to copy a file to a remote server using a runtime exec command as follows:
Runtime.getRuntime().exec("scp "+getProperty(ListNewHandsetDetailsConstant.PROP_OUTPUT_PATH_JAR)+getProperty(ListNewHandsetDetailsConstant.PROP_OUTPUT_JAR_NAME)+".jar "+" "+getProperty(ListNewHandsetDetailsConstant.PROP_OUTPUT_PATH_TWO_USERNAME)+"@"+getProperty(ListNewHandsetDetailsConstant.PROP_OUTPUT_PATH_TWO_URL)+":"+getProperty(ListNewHandsetDetailsConstant.PROP_OUTPUT_PATH_TWO_JAR));
Problem is this statement does not execute, as when I try it directly on command line, it requests for a password. Any suggestions on how I can get rid of that? I think I might have to configure my ssh_config file, but when I did some "Googling", I found the configuration settings of a ssh2_config file. I tried those (changing it to Host-based Authentication), but it didn't recognise them. Please help, this is so urgent!
Regards,
Simz

Don't use Runtime.exec (or ProcessBuilder) for this. Check out JSch at JCraft (or some other Java SSH API.

Where to put files in using runtime.exec(run.exe)?

I try to use the following program in EJB to call my EXE program in the J2EE server:
runtime.exec("c:\\j2ee\\public\\exe\\run.exe temp.txt");
In the execution of mill_turn.exe, it will open several files for read and write.
So where to put the file temp.txt and other files the run.exe need to read?
Looks like the J2EE server can not find them?
Thanks!

I got it in Java SE1.4.
File dir=new File("c:\\j2ee\\public_html\\Mill_turn\\exe\\");
Process proc = rt.exec(cmd,null,dir);Use above codes, I really got the right output from my external program for the first time. But , after that, the output keeps same when I change the filename in the following code:
cmd="c:\\..\\run.exe temp.prt"
to
cmd="c:\\..\\run.exe Abc1.prt" , which must have different output.
The codes for calling external program are implemented in the SessionBean of J2EE.

Using Runtime.exec on a Unix System

hi,
I have a web service which executes a command line process 'Runtime.exec(command)'. When the server starts to go on a high load I start to get "IOException: Not Enough Space" which I understand means that I am running out of swap space. No problem as I can increase the swap space to cope with demand. The problem is that I have read that when JVM attempts a fork on a Unix system it temporarily creates a new JVM with the same space requirements as the app server JVM. So if I set my app server to require 1GB memory, I am likely to need to set up swap so that it has 1GB * Number of Parallel Processes. I need to know if this is correct. Our application today does not limit the number of Runtime.exec commands which can be run in parallel and if the above is true we are going to have a problem ensuring we don't run out of memory.
Can any one verify this or suggest other solutions to the problem?
Thanks
Stephen

hi,
Yes, very helpful jwenting! Problem is that we are working with legacy systems where we have few other options. If you can give any positive input it's not worth leaving your option at all.
Thanks
Stephen

Using runtime.exec to zip some files

Hi,
I am using runtime.exec to try to automatically zip a bunch of files on a server. However, it does not seem to be working.
Before I execute the command, I save the zip command in a string. I then print the string to a log file, and then execute the runtime zip command. But nothing happens.
Yet, when I copy the string from the log, and paste it in a terminal, it properly creates the zip files. So, I know I have the correct command string, it just does not seem to be working within the java application. Also, the command string uses fully qualified directories, so it is not a directory issue.
I am using ubuntu linux.
Any ideas?
-Adam

adamSpline wrote:
Hi,
I am using runtime.exec to try to automatically zip a bunch of files on a server. However, it does not seem to be working.
Before I execute the command, I save the zip command in a string. I then print the string to a log file, and then execute the runtime zip command. But nothing happens. Within Runtime.exec() any command does not run in a shell and I bet you use wild cards and/or other commands to be interpreted by a shell which will not be interpreted since there is no shell. And, since you don't mention error messages or the return code, I will also bet you don't process the Process stdout , stderr and the return code properly.
It looks to me like you have fallen for at least two for the traps in [http://www.javaworld.com/javaworld/jw-12-2000/jw-1229-traps.html|http://www.javaworld.com/javaworld/jw-12-2000/jw-1229-traps.html].
>
Yet, when I copy the string from the log, and paste it in a terminal, it properly creates the zip files. So, I know I have the correct command string, it just does not seem to be working within the java application. Also, the command string uses fully qualified directories, so it is not a directory issue.
I am using ubuntu linux.
Any ideas?I agree with 'masijade' - use the built in Java classes.
>
-Adam

Runtime.exec() hangs on solaris 10, deadlock in soft_delete_session ?

Hi,
In my application sometimes Runtime.exec calls hangs for ever.
The pstack of java process is at the end of the post. It seems like there is a deadlock in soft_delete_session.
Does anyone know of any java/os patch we can apply to fix this issue?
I will really appreciate any tips to get over this issue.
# uname -a
SunOS thor256 5.10 Generic_120011-14 sun4u sparc SUNW,Sun-Fire-V245
# /opt/VRTSjre/jre1.5/bin/java -version
java version "1.5.0_10"
Java(TM) 2 Runtime Environment, Standard Edition (build 1.5.0_10-b03)
Java HotSpot(TM) Server VM (build 1.5.0_10-b03, mixed mode)
The trace is as follows:
0xff340408 __lwp_park + 0x10
0xff339068 mutex_lock_internal + 0x5d0
0xfb08a2ec soft_delete_session + 0xf0
0xfb089f90 soft_delete_all_sessions + 0x4c
0xfb084348 finalize_common + 0x70
0xfb0844d8 softtoken_fini + 0x44
0xfb0d8d48 _fini + 0x4
0xff3c00d0 call_fini + 0xc8
0xff3ca614 remove_hdl + 0xab8
0xff3c4d54 dlclose_intn + 0x98
0xff3c4e68 dlclose + 0x5c
0xfb3a2b3c pkcs11_slottable_delete + 0x138
0xfb39d664 pkcs11_fini + 0x4c
0xff2c0ea0 postforkchild_handler + 0x30
0xff332c20 fork + 0x140
0xfe8f8df4 Java_java_lang_UNIXProcess_forkAndExec + 0x7d4
0xf9226020 0xf9226020 * java.lang.UNIXProcess.forkAndExec(byte[], byte[], int, byte[], int, byte[], boolean, java.io.FileDescriptor, java.io.FileDescriptor, java.io.FileDescriptor) bci:0 (Compiled frame; information may be imprecise)
0xf92216c4 0xf92216c4 * java.lang.UNIXProcess.(byte[], byte[], int, byte[], int, byte[], boolean) bci:62 line:53 (Compiled frame)
0xf90fa6b8 0xf90fa6b8 * java.lang.ProcessImpl.start(java.lang.String[], java.util.Map, java.lang.String, boolean) bci:182 line:65 (Compiled frame)
0xf90fbe0c 0xf90fbe0c * java.lang.ProcessBuilder.start() bci:112 line:451 (Compiled frame)
0xf921842c 0xf921842c * java.lang.Runtime.exec(java.lang.String[], java.lang.String[], java.io.File) bci:16 line:591 (Compiled frame)
0xf9005874 * java.lang.Runtime.exec(java.lang.String[]) bci:4 line:464 (Interpreted frame)
0xf9005874 * TestExec.run() bci:26 line:22 (Interpreted frame)
0xf9005c2c * java.lang.Thread.run() bci:11 line:595 (Interpreted frame)
0xf9000218
0xfecdca88 void JavaCalls::call_helper(JavaValue*,methodHandle*,JavaCallArguments*,Thread*) + 0x5b8
0xfecf4310 void JavaCalls::call_virtual(JavaValue*,Handle,KlassHandle,symbolHandle,symbolHandle ,Thread*) + 0x18c
0xfecf416c void thread_entry(JavaThread*,Thread*) + 0x12c
0xfecf3ff0 void JavaThread::run() + 0x1f4
0xff02fb30 void*_start(void*) + 0x200
0xff340368 lwpstart

Found this information about this problem:
Bug: http://bugs.opensolaris.org/bugdatabase/view_bug.do?bug_id=6276483
Info for patch 127111-11: http://sunsolve.sun.com/search/document.do?assetkey=1-21-127111-11-1
Download page: http://sunsolve.sun.com/show.do?target=patches/zos-s10

Set Path to DLLs for Runtime.exec(...)

I have got a little server application that creates a Process of an external application. (eg Example1.exe or Example2.exe - which one is to be called is configurable via property files)
All of these external apps rely on a couple of DLLs, that are distributed seperately from the ExampleX.exe.
So my directory structure looks something like this:
/Server (contains my java app)
/Server/dll (contains the dlls)
/Server/app (contains ExampleX.exe files)
How do I configure my Runtime.exec(...) so that it can supply a PATH info to my DLLs?
How about the ...exec(String command, String[] envp, File dir) call?
-> It already works when the DLLs are in the same dir as my .exe files.
-> I would like to avoid setting a global PATH to my DLLs in the OS.
Has anybody already dug itself through this pile?

Solved my problem, awarded the Dukes to myself! ;-)
Here's what I did in case somebody else has similar probs:
The envp Parameter didn't work for me. The Application and the DLLs were found but the Subprocess was somehow screwed up - the Threading didn't work right. (I have no clue how that could be, but whatever...)
Anyway I could put the path to the DLLs in the PATH info of my startup script for the Java-Server. The subprocess inherits that information.
I used relative path info there so that nobody has to fiddle around in the script when the application is moved to different directories.
The only thing you have to do then is to set the present working directory of the subprocess to the location of the server via ...execute(String, String[], File)
You need to supply thecomplete path to the application in the first String parameter that way but all in all this semms to be the most sensible way to do it.

Use of Runtime.exec

I know that there are security concerns with making a call to the java.lang.Runtime's
exec method, but are there any performance concerns? When an exec call is made
by an object within the application server does the forking of a new process to
execute the command cause a process equivalent in size to the application server
to be generated? Our application server process is quite large, so this would
be an expensive operation.

The OS-level semantics of Runtime.exec are tied to JVM implementation (that's why
it doesn't work on most releases of the MacOS for example)...
Runtime.exec has a lot of not-so-intuitive handholding associated with it. For
example, did you know that on most flavors of Windows JVMs, you have to read out
of the STDOUT and STDERR streams, or the process you invoked will hang when their
buffer fills up? JavaWorld ran an article a while back with all the details on
this-- you can write a stream gobbler to suck up anything and send it to /dev/null
to avoid problems.
"Ash Beitz" <[email protected]> wrote:
>
I know that there are security concerns with making a call to the java.lang.Runtime's
exec method, but are there any performance concerns? When an exec call
is made
by an object within the application server does the forking of a new
process to
execute the command cause a process equivalent in size to the application
server
to be generated? Our application server process is quite large, so this
would
be an expensive operation.

Performance issue Runtime. exec("cp folder1 folder") in Linux,Weblogic.

Using Runtime. exec() copying files from folder1 to folder2 using cp command in Linux. It will take each file copy 2 sec if we use web logic 10.3 and jrocket. if we run in Linux without web logic it takes only 0.013 sec. why it takes more time to load cp command with web logic.
Environment
Weblogic 10.3
Linux 5.2
Jrocket 1.6

A 64 bit VM is not necessarily faster than a 32 bit one. I remember at least on suggestion that it could be slower.
Make sure you use the -server option.
As a guess IBM isn't necessarily a slouch when it comes to Java. It might simply be that their VM was faster. Could have used a different dom library as well.
Could be an environment problem of course.
Profiling the application and the machine as well might provide information.

Why cant I Runtime.exec(file.getAbsolutePath()) ???

I want to run custom file (not directory!) using Runtime.exec() (or you know other way? :) )
Here is what i get::
java.io.IOException: CreateProcess: C:\Documents and Settings\Sugar.SERVER\jbproject\test\theFileICannotOpen.txt error=2
     at java.lang.Win32Process.create(Native Method)
     at java.lang.Win32Process.<init>(Win32Process.java:66)
     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 NotWorkingRuntimeClass.main(NotWorkingRuntimeClass.java:27)P.S. 1) the file i want to open EXISTS.
2) I can get also the 193 error code.
P.P.S. It WORKS on *.exe files. How to make all type-files to open? (allow the system to decide which application to use for opening the fie, of course...)
Please help!
THANK YOU!!!

Well, then i've got another question.
How to open the specified file using the system's default program for such file types?
Thanks again, Boris.

Problem with Runtime.exec()

Hi,
I'm having a problem with Runtime.exec() . I have a batch file with debug option to FTP the desktop file to mainframe. When I executed this in Windows it's shows me the responce from the server (like ' Transfer Completed' ) for my FTP commands. But when I launch this through java it's only shows the errors not the normal responces from the server. I need this responses to confirm the proper transfer of file.
My Java Code:
String strCommand = "cmd.exe /c " + outdirectory + batchfilename;
boolean bWait = true;
Runtime r = Runtime.getRuntime();
Process pr = r.exec(strCommand);
BufferedInputStream bis =new BufferedInputStream(pr.getInputStream ());
int c=0;
/** Outlet for IO for the process **/
while (c!=-1) {
c=bis.read();
/**Now wait for the process to get finished **/
if(bWait == true){
pr.waitFor();
pr.destroy();
My Batch file is :
FTP -n -d -s:C:\IT2.cmd > C:\tIT2.log
EXIT
Thanks
Sathiesh

Ahh, you are redirecting the standard out from the ftp command to a file, therefore no output is sendt back to your java code,
you have to redirect the stderr stream, not the stdout stream in your batch file;
FTP -n -d -s:C:\IT2.cmd 2> C:\tIT2.log(notice the "2>" instead of ">")
Now your batch file should direct the error stream to the log, and the standard output back to the java program.
(I'm used to UNIX streams, not NT, but the "2>" redirection should work on NT also I guess)

Question about Runtime.exec

Rob,
Thanks for your help.
I asked a question about a weird Exception on Nov 14, and you told me that I am
using Runtime.exec to start an external process, and that process is crashing.
I am a green-hand on Weblogic, and I am trying to enhancing a project developped
by another person, so I am not familiar with some concepts yet.
Could you please give me some simple explanation about Runtime.exec and external
process?
I found two methods that uses "Runtime" from two classes as following, could you
help me to see whether or not there is something wrong with the usage of Runtime?
Thank you very much.
private int runShellCommand(String command) {
int exitVal = -1;
try {
File runDir = new File(runDirectory);
String[] env = new String[0];
Runtime rt = Runtime.getRuntime();
               double start = System.currentTimeMillis();
Process proc = rt.exec(command, env, runDir);
// Capture output in separate thread
ThreadedStreamReader error = new ThreadedStreamReader(proc.getErrorStream(),
"ERROR");
ThreadedStreamReader output = new ThreadedStreamReader(proc.getInputStream(),
"OUTPUT");
error.start();
output.start();
exitVal = proc.waitFor();
if (logger.isDebugEnabled()) {
     double runtime = (System.currentTimeMillis() - start) / 1000.0;
     logger.info("run " + runId + " " + command + " finished in " + runtime
+ " seconds");
} catch (IOException e) {
logger.fatal("DOE-2 failed \n" + e.getMessage());
} catch (InterruptedException e) {
e.printStackTrace();
return exitVal;
public static void main(String[] args) throws Exception, InterruptedException
final Doe2MessageServer server = new Doe2MessageServer();
while(!connected) {
Thread.sleep(1000);
logger.info("Attempting to start JMS service ...");
               try {
          server.init();
               } catch (Exception ex) {
// shutdown hook to close JMS connection
Runtime.getRuntime().addShutdownHook(
new Thread() {
public void run() {
server.finalize();
server.receiveMessage();

Runtime.exec is a J2SE API. It's not really specific to WLS.
You can read about it here:
http://java.sun.com/j2se/1.4.1/docs/api/java/lang/Runtime.html
It looks like you are starting a JMS Server in a separate process and
that process is crashing.
(You could of course just use WLS's JMS Server instead :>)
-- Rob
Iris Qu wrote:
Rob,
Thanks for your help.
I asked a question about a weird Exception on Nov 14, and you told me that I am
using Runtime.exec to start an external process, and that process is crashing.
I am a green-hand on Weblogic, and I am trying to enhancing a project developped
by another person, so I am not familiar with some concepts yet.
Could you please give me some simple explanation about Runtime.exec and external
process?
I found two methods that uses "Runtime" from two classes as following, could you
help me to see whether or not there is something wrong with the usage of Runtime?
Thank you very much.
private int runShellCommand(String command) {
int exitVal = -1;
try {
File runDir = new File(runDirectory);
String[] env = new String[0];
Runtime rt = Runtime.getRuntime();
               double start = System.currentTimeMillis();
Process proc = rt.exec(command, env, runDir);
// Capture output in separate thread
ThreadedStreamReader error = new ThreadedStreamReader(proc.getErrorStream(),
"ERROR");
ThreadedStreamReader output = new ThreadedStreamReader(proc.getInputStream(),
"OUTPUT");
error.start();
output.start();
exitVal = proc.waitFor();
if (logger.isDebugEnabled()) {
     double runtime = (System.currentTimeMillis() - start) / 1000.0;
     logger.info("run " + runId + " " + command + " finished in " + runtime
+ " seconds");
} catch (IOException e) {
logger.fatal("DOE-2 failed \n" + e.getMessage());
} catch (InterruptedException e) {
e.printStackTrace();
return exitVal;
public static void main(String[] args) throws Exception, InterruptedException
final Doe2MessageServer server = new Doe2MessageServer();
while(!connected) {
Thread.sleep(1000);
logger.info("Attempting to start JMS service ...");
               try {
          server.init();
               } catch (Exception ex) {
// shutdown hook to close JMS connection
Runtime.getRuntime().addShutdownHook(
new Thread() {
public void run() {
server.finalize();
server.receiveMessage();

Runtime.exec() error codes

I am getting the following exception when I try doing...
r.exec ( "cmd/c start/b notepad" );
Want to diagnose but don't see the errorcode any where documented.
thanks in advance.
java.io.IOException: CreateProcess: start dir error=2
at java.lang.Win32Process.create(Native Method)
at java.lang.Win32Process.<init>(Win32Process.java:63)
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 com.ugsolutions.aif.installer.Installer.main(Unknown Source)

hi I am having the same problem. I have a .cmd file that needs an arguement to run. The .cmd file connects to a server via PSCP. The .cmd file works properly on it's own on the commandline with an appropriate arguement, but as for using it thru the java file - it doesnt even hang, it just doesnt execute. Can anyone help me please?
Fin.
CODE:
import java.io.*;
class ExecDemo
     public static void main(String[] args) throws IOException
          //if( args.length < 2 )
          //     System.out.println( "Please specify parameters" );
          //else
               //System.out.println( args[0] );
               //System.out.println( args[1] );
               String command;
               command = "/cmd -c package.cmd 331/Finbarr/*";
               System.out.print( command );
               Runtime rt = Runtime.getRuntime ();
               try
                    Process rtProcess = rt.exec ( command ); //
                    // Print command output onto standard output
                    InputStream is = rtProcess.getInputStream();
                    InputStreamReader isr = new InputStreamReader(is);
                    BufferedReader br = new BufferedReader(isr);
                    String str;
                    System.out.println();
                    System.out.println("starting...");
                    int i = 0;
                    while ((str = br.readLine()) != null)
                         System.out.println(i + " " + str);
                         i ++;
                    is.close();
                    System.out.println("over...");
                    try
                         rtProcess.waitFor();
                    catch (InterruptedException ire)
                         ire.printStackTrace();
               catch (IOException ioe)
                    ioe.printStackTrace();
}

Security issues - Runtime().exec() on RMIServer

Hi.
I have a RMI system where the RMIClient calls the RMIServer to start a new program - notepad.exe - at the RMIServer.
RMIServer has a remote object that uses Runtime().exec() to start notepad.exe.
I have the following security policy file on the RMIServer:
grant {
permission java.net.SocketPermission "*:1024-65535",
"connect,accept";
permission java.net.SocketPermission "*:80", "connect";
permission java.io.FilePermission "C:\\WINNT\\system32", "read,write,execute";
I am getting the following exception:
java.security.AccessControlException: access denied (java.io.FilePermission <<ALL FILES>> execute)
at java.security.AccessControlContext.checkPermission(Unknown Source)
at java.security.AccessController.checkPermission(Unknown Source)
at java.lang.SecurityManager.checkPermission(Unknown Source)
at java.lang.SecurityManager.checkExec(Unknown Source)
at java.lang.Runtime.exec(Unknown Source)
at java.lang.Runtime.exec(Unknown Source)
at java.lang.Runtime.exec(Unknown Source)
at java.lang.Runtime.exec(Unknown Source)
at HelloImpl.executeLocalProgram(HelloImpl.java:32)
at HelloImpl.sayHello(HelloImpl.java:22)
at java.lang.reflect.Method.invoke(Native Method)
at sun.rmi.server.UnicastServerRef.dispatch(Unknown Source)
at sun.rmi.transport.Transport$1.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at sun.rmi.transport.Transport.serviceCall(Unknown Source)
at sun.rmi.transport.tcp.TCPTransport.handleMessages(Unknown Source)
I am not sure if I am missing any other security configuration. Please advise.
thankyou.
Denny

I think you may have the first path specified wrongly. Try making the first parameter "C:\\WINNT\\system32\\notepad.exe" see the JavaDoc for java.io.FilePermission for specifics.
Dave.

Runtime.exec() on a server

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