ERROR while querying ACM driver's information

Question

I am using following scheme to transmit sound over network:
file -> input datasource -> processor -> output datasource -> RTPManager -> network
File from which i am transmitting is temporary. I am create this file before transmit and delete it after.
1. Application starts
2. I am perform transmit first time - everything fine, but in std otput i see message "ERROR while querying ACM driver's information".
3. I am perform transmit second time - everything fine, but file that i am created for transmitting stays locked by JMF for about 20 minutes.
4. Any transmit after "ERROR while querying ACM driver's information" locks input file for about 15-20 minutes.
Any suggestions will be appreciated.
Thanks for advance!

Answer 1

I can't download your code RAR, so can you just post the code you're using to handle the shutdown? (and please use the code tags)Thanks for anwser. There is entire test code i wrote (code with "mutex" variable is not nessesary, i wrote it just for clearer output):
import javax.media.*;
import javax.media.format.AudioFormat;
import javax.media.protocol.ContentDescriptor;
import javax.media.protocol.DataSource;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.File;
import java.nio.channels.FileChannel;
public class Test {
    public static void main(String[] args) {
        File sourceFile = new File("1.wav");
        for (int i = 0; i < 3; i++) {
            System.out.format("Try number %d\n", i);
            File tempFile;
            try {
                tempFile = File.createTempFile("TestTemp", ".wav");
            } catch (IOException e) {
                System.err.format("Cannot create temporary file %s \n", e);
                return;
            if (!copyFile(sourceFile, tempFile)) {
                return;
            DataSource ds;
            try {
                ds = javax.media.Manager.createDataSource(new MediaLocator("file:" + tempFile.getPath()));
            } catch (Exception e) {
                System.err.format("Cannot create datasource %s \n", e);
                return;
            Format[] formats = new Format[1];
            formats[0] = new AudioFormat(AudioFormat.ULAW_RTP, 8000, 8, 1);
            ProcessorModel prm = new ProcessorModel(ds, formats, new ContentDescriptor(ContentDescriptor.RAW_RTP));
            Processor processor;
            try {
                processor = Manager.createRealizedProcessor(prm);
            } catch (Exception e) {
                System.err.format("Cannot create processor %s \n", e);
                return;
            processor.close();
            Object mutex = new Object();
            synchronized (mutex) {
                try {
                    mutex.wait(1000);
                } catch (InterruptedException e) {
                    System.err.format("Thread interrupted, try number " + i + "\n");
                    return;
            if (!tempFile.delete()) {
                System.err.format("Cannot delete temporary file, try number " + i + "\n");
            System.out.format("Try end number %d\n", i);
    public static boolean copyFile(File sourceFile, File destFile) {
        FileChannel source = null;
        FileChannel destination = null;
        try {
            source = new FileInputStream(sourceFile).getChannel();
            destination = new FileOutputStream(destFile).getChannel();
            destination.transferFrom(source, 0, source.size());
        } catch (Exception e) {
            System.err.format("Error while copying files %s \n", e);
            return false;
        finally {
            if (source != null) {
                try {
                    source.close();
                } catch (IOException e) {
                    System.err.format("Error while trying close source file %s \n", e);
            if (destination != null) {
                try {
                    destination.close();
                } catch (IOException e) {
                    System.err.format("Error while trying close destination file %s \n", e);
        return true;
}I have figured out that if i continue to try deleting files used by processor (that already closed) while program is running, files will be deleted after ~15 minutes. I have figured out this while testing my main application. This test app also may be modified to reproduce this behaviour. If you want, i can submit a modified test code to reproduce this behaviour.
If JMF is maintaining a file lock, then I assume you've improperly shutdown the processor / datasink...About resource deallocation. First, there is no datasink i have been created manually (may be jmf create it internally, but i dont think so). In my test application i've been created only input datasource and processor. I have tried deallocate datasource also, but this is dont have any effect. In JMF reference we can see this description of method Processor.close():
"Releases all resources and cease all activity."
I think this is enough to call Processor.close() to deallocate input file, is that right?