Runtime.exec() fails to run "javac" with "*.java" as arguments

Hello,
I am observing that Runtime.exec() consistently fails to execute "javac" when the Java files to be compiled are specified as "*.java". It fails with the following error:
javac: file not found: /home/engine931/*.java
Usage: javac <options> <source files>
The same command used for Runtime.exec() runs fine from a the command shell. Is this is known problem with the Runtime class on UNIX, because it works fine on Windows.
Any advise is appreciated.
Thanks,
Ranjit

Your shell is expanding the command when you run javac from the shell. Try constructing your Runtime parameters so that your shell is executed, which then executes javac.
The specific behavior is entirely dependent on the command interpreter that's used.

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Runtime.exec() fails sometime to execute a command

Hello,
I have a program thats using Runtime.exec to execute some external programs sequence with some redirection operators.
For e.g, I have some command as follows;
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Thanks,
~jaideep
Herer is the code snippet;
Runtime runtime = Runtime.getRuntime();
//create process object to handle result
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commandToRun = "cmd /c " + command;
process = runtime.exec( commandToRun );
CommandOutputReader cmdError = new CommandOutputReader(process.getErrorStream());
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cmdError.start();
cmdOutput.start();
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chkProcess.start();
int retValue = process.waitFor();
if(retValue != 0)
return -1;
output = cmdOutput.getOutputData();
cmdError = null;
cmdOutput = null;
chkProcess = null;
/*******************************supporting CommandOutputReader class *********************************/
public class CommandOutputReader extends Thread
private transient InputStream inputStream; //to get output of any command
private transient String output; //output will store command output
protected boolean isDone;
public CommandOutputReader()
super();
output = "";
this.inputStream = null;
public CommandOutputReader(InputStream stream)
super();
output = "";
this.inputStream = stream;
public void setStream(InputStream stream)
this.inputStream = stream;
public String getOutputData()
return output;
public void run()
if(inputStream != null)
final BufferedReader bufferReader = new BufferedReader(new InputStreamReader(inputStream), 1024 * 128);
String line = null;
try
while ( (line = bufferReader.readLine()) != null)
if (ResourceString.getLocale() != null)
Utility.log(Level.DEBUG,line);
//output += line + System.getProperty(Constants.ALL_NEWLINE_GETPROPERTY_PARAM);
output += line + "\r\n";
System.out.println("<< "+ this.getId() + " >>" + output );
System.out.println("<< "+ this.getId() + " >>" + "closed the i/p stream...");
inputStream.close();
bufferReader.close();
catch (IOException objIOException)
if (ResourceString.getLocale() != null)
Utility.log(Level.ERROR, ResourceString.getString("io_exeception_reading_cmd_output")+
objIOException.getMessage());
output = ResourceString.getString("io_exeception_reading_cmd_output");
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output = "io exeception reading cmd output";
finally {
isDone = true;
public boolean isDone() {
return isDone;
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/*******************************supporting process controller class *********************************/
public class CheckProcess extends Thread
private transient Process monitoredProcess;
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private transient long maxWait = Constants.WAIT_PERIOD;
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super();
this.monitoredProcess = monitoredProcess;
continueLoop =true;
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this.maxWait = max;
public void stopProcess()
continueLoop=false;
public void run()
//long start1 = java.util.Calendar.getInstance().getTimeInMillis();
final long start1 = System.currentTimeMillis();
while (true && continueLoop)
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if (System.currentTimeMillis() - start1 > maxWait)
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monitoredProcess.destroy();
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monitoredProcess = null;
return;
try
sleep(1000);
catch (InterruptedException e)
if (ResourceString.getLocale() != null)
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System.out.println("Exception in sleep" + e.getLocalizedMessage());
if(monitoredProcess != null)
monitoredProcess.destroy();
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// @PMD:REVIEWED:NullAssignment: by jbarde on 9/28/06 7:29 PM
monitoredProcess = null;
/*******************************supporting process controller class *********************************/

Hi,
Infact the command passed to the exec() is in the form of a batch file, which contains on of these commands. I can not put all commands in one batch file due to inherent nature of the program.
But my main concern was that, why would it behave like this. If I run the same command for 30 times 1~3 times the same command can not be executed (returns with error code 1, on wiun2k pro) and rest times it works perfectly fine.
Do you see any abnormality in the code.
I ahve used the same sequence of code as in the article suggested by
"masijade". i.e having threads to monitor the process and other threads to read and empty out the input and error streams so that the buffer does not get full.
But I see here the problem is not of process getting hanged, I sense this because my waitFor() returns with error code as 1, had the process hanged it would not have returned , am I making sense?
Regards,
~jaideep

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Runtime.exec() fails to run "javac" with "*.java" as arguments

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