java.lang.Process hang when recursively called - mcafee

Question

My program recursivly calls the McAfee OnDemad Virusscanner for a specific path. In a loop I fill the path with several files, scan it, remove the files, fill it and so on.
After a while the program suddenly hangs and I've no clue for the reason.
Calendar cl = Calendar.getInstance();
String cmd="uvscan -v /var/tmp/McAfee/scanFiles/"
try {
long start=cl.getTimeInMillis();
process = Runtime.getRuntime().exec(cmd, null);
Worker worker = new Worker(process);
worker.start();
try {
LOGGER.debug("Virusscan timeout set to {}ms", timeout);
worker.join(timeout);
if (worker.exit != null)
workerRC=worker.exit;
else {
cl = Calendar.getInstance();
long waitTime=cl.getTimeInMillis()-start;
throw new TimeoutException("Virusscan timeout after " + waitTime + "ms");
}
// else
// throw new TimeoutException();
} catch(InterruptedException ex) {
worker.interrupt();
Thread.currentThread().interrupt();
cl = Calendar.getInstance();
long waitTime=cl.getTimeInMillis()-start;
throw new TimeoutException("Virusscan timeout after " + waitTime + "ms");
}
File scanLog = new File(ConfigReader.getScanLog());
if (!ConfigReader.mustKeepScanLog()) scanLog.deleteOnExit();
LOGGER.debug("ScanLog is: " + scanLog.getPath() + " - RC=" + workerRC);
BufferedWriter bw = new BufferedWriter(new FileWriter(scanLog));
BufferedReader stdInput = new BufferedReader(new InputStreamReader(process.getInputStream()));
// read the output from the command
while ((buffer = stdInput.readLine()) != null) {
inspectScanlog(buffer, workerRC);
bw.write(buffer+"\n");
LOGGER.debug("Scan STDOUT: " + buffer);
}
BufferedReader stdErr = new BufferedReader(new InputStreamReader(process.getErrorStream()));
while ((buffer = stdErr.readLine()) != null) {
LOGGER.debug("Scan STDERR: " + buffer);
}
bw.close();
cl = Calendar.getInstance();
long waitTime=cl.getTimeInMillis()-start;
LOGGER.info("Virusscan took " + waitTime + "ms");
if (workerRC != 0){
int cc=12;
ConfigReader.setMaxCC(cc);
LOGGER.error("RC={} - Virusscan ended with error. CMD=",cc, cmd);
if (workerRC==13) {
LOGGER.error("RC={} - The scanner found one or more viruses or hostile objects - such as a Trojan-horse program, joke program, or test file.", cc);
}
}
}
catch (Exception e) {
int cc=12;
ConfigReader.setMaxCC(cc);
LOGGER.error("RC={} - {}",cc, e.getMessage());
e.printStackTrace();
} finally {
if (process!=null) {
process.destroy();
}
}
It looks like a hang of the complete program; even the timeout (240000ms) doesn't match. The GC-log seems kind of interrupted:
258.070: [Full GC [PSYoungGen: 13456K->7362K(85120K)] [PSOldGen: 59271K->60735K(81728K)] 72727K->68098K(166848K) [PSPermGen: 16282K->16282K(30400K)], 0.3019290 secs] [Times: user=0.31 sys=0.00, real=0.31 secs]
264.208: [GC [PSYoungGen: 65466K->8773K(92224K)] 126202K->69581K(173952K), 0.0528360 secs] [Times: user=0.10 sys=0.00, real=0.05 secs]
265.445: [GC [PSYoungGen: 81774K->9133K(92096K)] 142582K->70061K(173824K), 0.0205430 secs] [Times: user=0.03 sys=0.00, real=0.02 secs]
266.916: [GC [PSYoungGen: 82515K->9698K(100096K)] 143443K->70658K(181824K), 0.0189050 secs] [Times: user=0.04 sys=0.00, real=0.02 secs]
267.817: [GC [PSYoungGen: 92311K->1436K(100480K)] 153271K->70986K(182208K), 0.0210400 secs] [Times: user=0.03 sys=0.01, real=0.02 secs]
274.208: [GC [PSYoungGen: 84072K->672K(112256K)] 153622K->71297K(193984K), 0.0029610 secs] [Times: user=0.00 sys=0.00, real=0.00 secs]
275.769: [GC [PSYoungGen: 94880K->500K(112832K)] 165505K->71732K(194560K), 0.0022440 secs]
The uvscan-command has been called 277.609 seconds after program-start.
Could anyone suggest how to get the reason for the hang?
Thanks in advance,
Ulrich