Sometimes, when I create a process with Runtime.exec, waitFor never
returns, even though I'm clearing the error and output streams.
Here is my code, with important lines starred:
static void shexec(String command) throws
InternalErrorException {
String[]
commandArray = {"/bin/sh", "-c", command};
String[]
envArray = {"TERM=vt100"};
Log.logMessage("About
to call exec");
try
{
Log.logMessage("/bin/sh -c " + command);
****
Process p =
Runtime.getRuntime().exec(commandArray, envArray);
InputStream is = p.getErrorStream();
byte cbuf[] = new byte[1024];
int len;
while ((len = is.read(cbuf, 0, 1024)) != -1) {
if
(len > 0) {
String errorMessage = new String(cbuf, 0, len);
Log.logMessage("Read " + len + " bytes from
ErrorStream:" + errorMessage);
throw new InternalErrorException(errorMessage);
}
}
Log.logMessage("Done with ErrorStream");
is = p.getInputStream();
while ((len = is.read(cbuf, 0, 1024)) != -1)
Log.logMessage("Read
" + len + " bytes from InputStream");
Log.logMessage("Done with InputStream");
p.getOutputStream().close();
****
Log.logMessage("About to call waitFor");
****
p.waitFor();
****
Log.logMessage("Return value is " + p.exitValue());
Log.logMessage("Back from waitFor");
****
} catch (Exception e) {
Log.logMessage("Exception occurred: " + e);
throw new InternalErrorException(e);
}
}
My log file reads:
- About to call exec
- /bin/sh -c lynx -dump -force_html
/home/systers/javamlm/archive/94.text-html >
/home/systers/javamlm/archive/94.text-plain
- Done with ErrorStream
- Done with InputStream
- About to call waitFor
I am using:
- java version "1.3.0"
- Java(TM) 2 Runtime Environment, Standard Edition (build
Blackdown-1.3.0-FCS)
- Java HotSpot(TM) Client VM (build Blackdown-1.3.0-FCS, mixed mode)
ps shows the process as being defunct.
This has been frustrating me for a long time.
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