Develop Reference

BitcoinJ wallet shows wrong balance

I'm getting familiar with BitcoinJ. So now there is a function for user that registers for the first time and there should be created address for him. But it doesn't work. It says there is already some money.
// USER HAS NEVER USED COIN_ATLAS ( IT IS THE FIRST TIME )
public void addUser()
{
DBObject dbUser;
WalletAppKit kit = new WalletAppKit(TestNet3Params.get(), new File("."), "forwarding-service-testnet");
params = TestNet3Params.get();
Debug.Log("Wait a bit...");
kit.startAsync();
kit.awaitRunning();
BlockChain chain = null;
my_wallet = kit.wallet(); // Wallet created for that user
try {
chain = new BlockChain(params, my_wallet,
new MemoryBlockStore(params));
} catch (BlockStoreException e) {
e.printStackTrace();
}
PeerGroup peerGroup = new PeerGroup(params, chain);
peerGroup.addPeerDiscovery(new DnsDiscovery(params));
peerGroup.addWallet(my_wallet);
peerGroup.startAsync();
Debug.Log("WALLET: " + my_wallet.currentReceiveAddress());
Debug.Log("WALLET BALANCE: " + my_wallet.getBalance().toFriendlyString());
my_wallet.addCoinsReceivedEventListener(new WalletCoinsReceivedEventListener() {
#Override
public void onCoinsReceived(Wallet wallet, Transaction transaction, Coin coin, Coin coin1) {
send("NEW TRANSACTION:");
sendWithMarkdown("FROM: " + wallet.currentReceiveAddress() + " : " + bold(coin1.toFriendlyString()));
Coin value = transaction.getValueSentToMe(wallet);
System.out.println("Received tx for " + value.toFriendlyString() + ": " + transaction);
Futures.addCallback(transaction.getConfidence().getDepthFuture(1), new FutureCallback<TransactionConfidence>() {
#Override
public void onSuccess(#Nullable TransactionConfidence transactionConfidence) {
send(bold("Transaction confirmed!"));
send(bold(value.toFriendlyString() + " is deposited!"));
}
#Override
public void onFailure(Throwable throwable) {
}
});
}
});
peerGroup.downloadBlockChain();
peerGroup.stopAsync();
dbUser = new BasicDBObject("_id", bot_user.getId())
.append("firstName", bot_user.getFirstName())
.append("password", bot_user.getPassword())
.append("address", my_wallet.currentReceiveAddress().toString())
.append("BTC", (double)my_wallet.getBalance().getValue());
collection.insert(dbUser);
}
There is what I get in output:
WALLET: mtrjbnpq5wDzoywrKqod63tpB7ZUFrr7q5
WALLET BALANCE: 1.21503904 BTC
But if I check this address in blockchain, it shows 0.
So how to create wallet the right way?

How to properly wait for apache spark launcher job during launching it from another application?

I am trying to avoid "while(true)" solution when i waiting until my spark apache job is done, but without success.
I have spark application which suppose to process some data and put a result to database, i do call it from my spring service and would like to wait until the job is done.
Example:
Launcher with method:
#Override
public void run(UUID docId, String query) throws Exception {
launcher.addAppArgs(docId.toString(), query);
SparkAppHandle sparkAppHandle = launcher.startApplication();
sparkAppHandle.addListener(new SparkAppHandle.Listener() {
#Override
public void stateChanged(SparkAppHandle handle) {
System.out.println(handle.getState() + " new state");
}
#Override
public void infoChanged(SparkAppHandle handle) {
System.out.println(handle.getState() + " new state");
}
});
System.out.println(sparkAppHandle.getState().toString());
}
How to wait properly until state of handler is "Finished".

I am also using SparkLauncher from a Spring application. Here is a summary of the approach that I took (by following examples in the JavaDoc).
The #Service used to launch the job also implements SparkHandle.Listener and passes a reference to itself via .startApplication e.g.
...
...
#Service
public class JobLauncher implements SparkAppHandle.Listener {
...
...
...
private SparkAppHandle launchJob(String mainClass, String[] args) throws Exception {
String appResource = getAppResourceName();
SparkAppHandle handle = new SparkLauncher()
.setAppResource(appResource).addAppArgs(args)
.setMainClass(mainClass)
.setMaster(sparkMaster)
.setDeployMode(sparkDeployMode)
.setSparkHome(sparkHome)
.setConf(SparkLauncher.DRIVER_MEMORY, "2g")
.startApplication(this);
LOG.info("Launched [" + mainClass + "] from [" + appResource + "] State [" + handle.getState() + "]");
return handle;
}
/**
* Callback method for changes to the Spark Job
*/
#Override
public void infoChanged(SparkAppHandle handle) {
LOG.info("Spark App Id [" + handle.getAppId() + "] Info Changed. State [" + handle.getState() + "]");
}
/**
* Callback method for changes to the Spark Job's state
*/
#Override
public void stateChanged(SparkAppHandle handle) {
LOG.info("Spark App Id [" + handle.getAppId() + "] State Changed. State [" + handle.getState() + "]");
}
Using this approach, one can take action when the state changes to "FAILED", "FINISHED" or "KILLED".
I hope this information is helpful to you.

I implemented using CountDownLatch, and it works as expected.
...
final CountDownLatch countDownLatch = new CountDownLatch(1);
SparkAppListener sparkAppListener = new SparkAppListener(countDownLatch);
SparkAppHandle appHandle = sparkLauncher.startApplication(sparkAppListener);
Thread sparkAppListenerThread = new Thread(sparkAppListener);
sparkAppListenerThread.start();
long timeout = 120;
countDownLatch.await(timeout, TimeUnit.SECONDS);
...
private static class SparkAppListener implements SparkAppHandle.Listener, Runnable {
private static final Log log = LogFactory.getLog(SparkAppListener.class);
private final CountDownLatch countDownLatch;
public SparkAppListener(CountDownLatch countDownLatch) {
this.countDownLatch = countDownLatch;
}
#Override
public void stateChanged(SparkAppHandle handle) {
String sparkAppId = handle.getAppId();
State appState = handle.getState();
if (sparkAppId != null) {
log.info("Spark job with app id: " + sparkAppId + ",\t State changed to: " + appState + " - "
+ SPARK_STATE_MSG.get(appState));
} else {
log.info("Spark job's state changed to: " + appState + " - " + SPARK_STATE_MSG.get(appState));
}
if (appState != null && appState.isFinal()) {
countDownLatch.countDown();
}
}
#Override
public void infoChanged(SparkAppHandle handle) {}
#Override
public void run() {}
}

asynccallback failures

In my app I need to add string vallues to the file(.property file, if it is important). and user enter this values in gwt GUI. Here is it's important part:
final Button submit = new Button("Submit");
addButton(submit);
submit.addSelectionListener(new SelectionListener<ButtonEvent>() {
#Override
public void componentSelected(ButtonEvent ce) {
keyWord.selectAll();
regexp.selectAll();
if (keyWord.getValue() != null){
setKeyWord(customerId, keyWord.getValue());
keyWord.setValue("");
}
if (regexp.getValue() != null){
setRegExp(customerId, regexp.getValue());
regexp.setValue("");
}
}
});
}
private void setKeyWord(final String customerId, final String keyword){
final AsyncCallback<String> callbackItems = new AsyncCallback<String>() {
public void onFailure(final Throwable caught) {
Window.alert("unable to add " + caught.toString());
}
public void onSuccess(final String x) {
Window.alert(x);
}
};
serverManagementSvc.setKeyWords(customerId, keyword, callbackItems);
}
private void setRegExp(final String customerId, final String regexp){
final AsyncCallback<String> calbackItems = new AsyncCallback<String>() {
#Override
public void onFailure(Throwable throwable) {
Window.alert("unable to add " + throwable.toString());
}
#Override
public void onSuccess(String s) {
Window.alert(s);
}
};
serverManagementSvc.setRegExp(customerId, regexp, calbackItems);
}
So I need to use Asunccallback to call methods which are in the "server part".
here are these methods:
//adds a new keyword to customers properties
public String setKeyWords(String customer, String word){
try{
PropertiesConfiguration props = new PropertiesConfiguration("/home/mikhail/bzrrep/DLP/DLPServer/src/main/resources/rules.properties");
String newKeyWord = new String(props.getString("users." + customer + ".keywords" + "," + word));
props.setProperty("users." + customer + ".keywords", newKeyWord);
props.save();
}catch (ConfigurationException e){
e.printStackTrace();
}
return "keyword " + word + " added";
}
// adds a new regexp to customer properties
public String setRegExp(String customer, String regexp){
try {
PropertiesConfiguration props = new PropertiesConfiguration("/home/mikhail/bzrrep/DLP/DLPServer/src/main/resources/rules.properties");
String newRegValue = new String(props.getString("users." + customer + ".regexps" + "," + regexp));
props.setProperty("users." + customer + ".regexps", newRegValue);
props.save();
} catch (ConfigurationException e){
e.printStackTrace();
}
return "regexp " + regexp + " added to " + customer + "'s config";
}
all interfaces are present.
when I run my code And press "submit" button in gui I see that both asynccallback failured(Window.alert, as you can see, shows "null pointer exception" despite of the fact that values which I send to methods are not null). why can it be? can you suggest me something?
UPD here is error which is shown by firebug:
uncaught exception: java.lang.ClassCastException
function W8(){try{null.a()}catch(a){return a}}

the problem is solved: there were a simple mistake in the code. I've closed brackets at the wrong place:
//adds a new keyword to customers properties
public String setKeyWords(String customer, String word){
try{
PropertiesConfiguration props = new PropertiesConfiguration("/home/mikhail/bzrrep/DLP/DLPServer/src/main/resources/rules.properties");
String newKeyWord = new String(props.getString("users." + customer + ".keywords") + "," + word);
props.setProperty("users." + customer + ".keywords", newKeyWord);
props.save();
}catch (ConfigurationException e){
e.printStackTrace();
}
return "keyword " + word + " added";
}
// adds a new regexp to customer properties
public String setRegExp(String customer, String regexp){
try {
PropertiesConfiguration props = new PropertiesConfiguration("/home/mikhail/bzrrep/DLP/DLPServer/src/main/resources/rules.properties");
String newRegValue = new String(props.getString("users." + customer + ".regexps") + "," + regexp);
props.setProperty("users." + customer + ".regexps", newRegValue);
props.save();
} catch (ConfigurationException e){
e.printStackTrace();
}
return "regexp " + regexp + " added to " + customer + "'s config";
}

I recommend that you recompile the GWT code using
-style PRETTY
and then check that firebug output again; it may give you a better clue, compared to your updated uncaught exception.
Next, I suggest you run it in the eclipse debugger, and set breakpoints in both the client and server code, and then you can inspect the variables and step through the code.

is JmDNS.create() is blocking or non blocking

i have created JmDNS example:
public class Service {
public static void main(String[] args) {
try {
JmDNS mdnsServer = null;
mdnsServer = JmDNS.create("localhost");
// Register a test service.
ServiceInfo testService = ServiceInfo.create("_myTest._tcp.local.", "Test-Service", 3, "test_service");
mdnsServer.registerService(testService);
} catch (IOException e) {
e.printStackTrace();
}
}
}
It runs for few seconds then it exits program, So i am wondering is it blocking or non blocking. I was thinking since it broadcast service over network so we need to exit application manually
Same is true for following ServiceDiscovery
public class ServiceDiscovery {
private static ServiceListenerClass listener;
private static int count = 0;
public static void main(String[] args) throws IOException {
JmDNS jmdns = null;
InetAddress address = null;
String type = "_myTest._tcp.local.";
Enumeration<NetworkInterface> ifc = NetworkInterface.getNetworkInterfaces();
while (ifc.hasMoreElements()) {
NetworkInterface anInterface = ifc.nextElement();
if (anInterface.isUp()) {
Enumeration<InetAddress> addr = anInterface.getInetAddresses();
while (addr.hasMoreElements()) {
if (!(address = addr.nextElement()).isLoopbackAddress())
break;
}
}
}
jmdns = JmDNS.create(address, type);
listener = new ServiceListenerClass();
jmdns.addServiceListener(type, listener);
}
public static class ServiceListenerClass implements ServiceListener {
public void serviceAdded(ServiceEvent event) {
event.getDNS().requestServiceInfo(event.getInfo().getServer(), event.getName(), true);
}
public void serviceRemoved(ServiceEvent event) {
System.out.println((count--) + " " + event.getInfo().getName());
}
public void serviceResolved(ServiceEvent event) {
System.out.println((count++) + " :Res: " + event.getInfo().getName() + " " + event.getInfo().getPort() + " " + event.getInfo().getApplication()
+ " " + event.getInfo().getDomain() + " " + event.getInfo().getKey());
for (InetAddress address : event.getInfo().getInetAddresses())
System.out.println(address.getHostAddress());
}
}
}

Without guarantee: JmDNS.create is non-blocking, the one which is blocking is the jmdns.registerService() method.

Bluecove: SERVICE_SEARCH_DEVICE_NOT_REACHABLE issue

I try to connect to a custom Bluetooth device using BlueCove. I can pair the device, but when I try to search for services I always get SERVICE_SEARCH_DEVICE_NOT_REACHABLE in serviceSearchCompleted() and no services are discovered. If I try the same thing outside Java (in Windows), the PC bluetooth device discovers and can connect (using COM21, COM22, ...) to the SPP service on my device.
What am I doing wrong?
I also tried to do the service search after the device discovery is ended. Same issue.
Please find below my code.
Many thanks in advance for any idea on how to solve this,
Adrian.
public class Test {
private static Logger LOG = Logger.getLogger(Test.class.getName());
private static final String NAME = "XXXX";
private static final String PIN = "1234";
private static final UUID[] UUIDS = new UUID[] {new UUID(0x0003), new UUID(0x1101)};
private LocalDevice localDevice;
private DiscoveryAgent discoveryAgent;
private DiscoveryListener discoveryListener = new GDiscoveryListener();
private Map<Integer, RemoteDevice> searchForServices = new HashMap<Integer, RemoteDevice>();
private Collection<ServiceRecord> servicesDiscovered = new HashSet<ServiceRecord>();
private Object lock = new Object();
private CountDownLatch waitForDevices;
protected void connect() {
try {
localDevice = LocalDevice.getLocalDevice();
localDevice.setDiscoverable(DiscoveryAgent.GIAC);
LOG.info("Local Device: " + localDevice.getFriendlyName()
+ "(" + localDevice.getBluetoothAddress() + ")");
discoveryAgent = localDevice.getDiscoveryAgent();
LOG.finest("Start discovering devices");
discoveryAgent.startInquiry(DiscoveryAgent.GIAC, discoveryListener);
try {
synchronized(lock) {
lock.wait();
}
if (searchForServices.size() > 0) {
waitForDevices = new CountDownLatch(searchForServices.size());
waitForDevices.await();
}
}
catch (InterruptedException e) {
LOG.log(Level.WARNING, "Error waiting to terminate discovery", e);
}
LOG.finest(servicesDiscovered.size() + " services discovered");
LOG.finest("Device discovery completed");
} catch (BluetoothStateException e) {
LOG.log(Level.WARNING, "Error initializing Bluetooth", e);
}
}
private class GDiscoveryListener implements DiscoveryListener {
public void deviceDiscovered(RemoteDevice rd, DeviceClass dc) {
try {
String name = rd.getFriendlyName(false);
boolean isMine = NAME.equals(name);
LOG.info("Discovered: " + name + "(" + rd.getBluetoothAddress() + ")"
+ (isMine ? "" : " - ignoring"));
if (!isMine)
return;
if (!rd.isAuthenticated()) {
LOG.finest("Try to pair with " + name
+ " PIN: " + PIN);
boolean paired = RemoteDeviceHelper.authenticate(rd, PIN);
LOG.info("Pair with " + name + (paired ? " succesfull" : " failed"));
}
int transID = discoveryAgent.searchServices(null, UUIDS, rd, discoveryListener);
searchForServices.put(transID, rd);
LOG.finest("Searching for services for " + name + " with transaction " + transID);
} catch (BluetoothStateException e) {
LOG.log(Level.WARNING, "Cannot search services for "
+ rd.getBluetoothAddress(), e);
} catch (IOException e) {
LOG.log(Level.WARNING, "Error connecting ", e);
} catch (Throwable t) {
LOG.log(Level.WARNING, "Cannot search services for "
+ rd.getBluetoothAddress(), t);
}
}
public void inquiryCompleted(int respCode) {
synchronized(lock) {
lock.notify();
}
switch (respCode) {
case DiscoveryListener.INQUIRY_COMPLETED :
LOG.fine("INQUIRY_COMPLETED");
break;
case DiscoveryListener.INQUIRY_TERMINATED :
LOG.fine("INQUIRY_TERMINATED");
break;
case DiscoveryListener.INQUIRY_ERROR :
LOG.fine("INQUIRY_ERROR");
break;
default :
LOG.fine("Unknown Response Code - " + respCode);
break;
}
}
public void serviceSearchCompleted(int transID, int respCode) {
String rd = searchForServices.get(transID).getBluetoothAddress();
//searchForServices.remove(transID);
switch (respCode) {
case DiscoveryListener.SERVICE_SEARCH_COMPLETED:
LOG.fine(rd + ": The service search completed normally");
break;
case DiscoveryListener.SERVICE_SEARCH_TERMINATED:
LOG.fine(rd + ": The service search request was cancelled by a call to DiscoveryAgent.cancelServiceSearch(int)");
break;
case DiscoveryListener.SERVICE_SEARCH_ERROR:
LOG.warning(rd + ": An error occurred while processing the request");
break;
case DiscoveryListener.SERVICE_SEARCH_NO_RECORDS:
LOG.info(rd + ": No records were found during the service search");
break;
case DiscoveryListener.SERVICE_SEARCH_DEVICE_NOT_REACHABLE:
LOG.warning(rd + ": The device specified in the search request could not be reached or the local device could not establish a connection to the remote device");
break;
default:
LOG.warning(rd + ": Unknown Response Code - " + respCode);
break;
}
if (waitForDevices != null)
waitForDevices.countDown();
}
public void servicesDiscovered(int transID, ServiceRecord[] srs) {
LOG.info("Services discovered in transaction " + transID + " : " + srs.length);
for (ServiceRecord sr : srs) {
LOG.info(sr.getConnectionURL(ServiceRecord.NOAUTHENTICATE_NOENCRYPT, false));
servicesDiscovered.add(sr);
}
}
}
public static void main(String[] args) {
new Test().connect();
}
}

I had the same problem while connecting to a Bluetooth earpiece. Like you I was also searching for more than one service at a time and It always returned SERVICE_SEARCH_DEVICE_NOT_REACHABLE. So, I tried searching for only one service and it worked. So, try modifying your code as:
...
private static final UUID[] UUIDS = new UUID[] {new UUID(0x0003)}