Program: 31000
Project: 31000
Buggy source:
public void initBitcoin(@Nullable DeterministicSeed restoreFromSeed) throws IOException {
  Threading.USER_THREAD=Platform::runLater;
  bitcoin=new WalletAppKit(params,AppDirectory.dir().toFile(),APP_NAME){
{
      walletFactory=PledgingWallet::new;
    }
    @Override protected void onSetupCompleted(){
      wallet=(PledgingWallet)bitcoin.wallet();
      backend=new LighthouseBackend(CLIENT,vPeerGroup,vChain,wallet);
      reached("String_Node_Str");
      walletLoadedLatch.countDown();
      if (params == RegTestParams.get()) {
        vPeerGroup.addAddress(new PeerAddress(unchecked(InetAddress::getLocalHost),RegTestParams.get().getPort()));
        vPeerGroup.addAddress(new PeerAddress(unchecked(InetAddress::getLocalHost),RegTestParams.get().getPort() + 1));
        vPeerGroup.setMinBroadcastConnections(1);
        vPeerGroup.setUseLocalhostPeerWhenPossible(false);
      }
 else {
        PeerDiscovery hardCodedPeers=new PeerDiscovery(){
          @Override public InetSocketAddress[] getPeers(          long timeoutValue,          TimeUnit timeoutUnit) throws PeerDiscoveryException {
            InetSocketAddress[] result=new InetSocketAddress[2];
            result[0]=new InetSocketAddress("String_Node_Str",params.getPort());
            result[1]=new InetSocketAddress("String_Node_Str",params.getPort());
            return result;
          }
          @Override public void shutdown(){
          }
        }
;
        vPeerGroup.addPeerDiscovery(hardCodedPeers);
        vPeerGroup.setMaxConnections(2);
        vPeerGroup.setConnectTimeoutMillis(10000);
        vPeerGroup.waitForPeersOfVersion(2,GetUTXOsMessage.MIN_PROTOCOL_VERSION).addListener(() -> {
          vPeerGroup.addPeerDiscovery(new DnsDiscovery(params));
          vPeerGroup.setMaxConnections(6);
        }
,Threading.SAME_THREAD);
      }
      vPeerGroup.addEventListener(new AbstractPeerEventListener(){
        @Override public void onPeerConnected(        Peer peer,        int peerCount){
          if (peer.getAddress().getAddr().isLoopbackAddress() && !peer.getPeerVersionMessage().isGetUTXOsSupported()) {
            log.warn("String_Node_Str");
            informationalAlert("String_Node_Str","String_Node_Str" + "String_Node_Str");
            vPeerGroup.setUseLocalhostPeerWhenPossible(false);
            vPeerGroup.setMaxConnections(4);
          }
        }
      }
);
    }
  }
;
  if (bitcoin.isChainFileLocked()) {
    informationalAlert("String_Node_Str","String_Node_Str");
    Platform.exit();
    bitcoin=null;
    walletLoadedLatch.countDown();
    return;
  }
  if (params == MainNetParams.get()) {
    bitcoin.setCheckpoints(getClass().getResourceAsStream("String_Node_Str"));
  }
 else   if (params == TestNet3Params.get()) {
    bitcoin.setCheckpoints(getClass().getResourceAsStream("String_Node_Str"));
  }
  bitcoin.setPeerNodes(new PeerAddress[0]).setBlockingStartup(false).setDownloadListener(MainWindow.bitcoinUIModel.getDownloadListener()).setUserAgent("String_Node_Str","String_Node_Str" + VERSION).restoreWalletFromSeed(restoreFromSeed);
  if (useTor && params != RegTestParams.get())   bitcoin.useTor();
  reached("String_Node_Str");
  bitcoin.addListener(new Service.Listener(){
    @Override public void failed(    Service.State from,    Throwable failure){
      bitcoin=null;
      walletLoadedLatch.countDown();
      CrashWindow.open(failure);
    }
  }
,Threading.SAME_THREAD);
  bitcoin.startAsync();
}

Fixed version (ground truth):
public void initBitcoin(@Nullable DeterministicSeed restoreFromSeed) throws IOException {
  walletLoadedLatch=new CountDownLatch(1);
  Threading.USER_THREAD=Platform::runLater;
  bitcoin=new WalletAppKit(params,AppDirectory.dir().toFile(),APP_NAME){
{
      walletFactory=PledgingWallet::new;
    }
    @Override protected void onSetupCompleted(){
      wallet=(PledgingWallet)bitcoin.wallet();
      backend=new LighthouseBackend(CLIENT,vPeerGroup,vChain,wallet);
      reached("String_Node_Str");
      walletLoadedLatch.countDown();
      if (params == RegTestParams.get()) {
        vPeerGroup.addAddress(new PeerAddress(unchecked(InetAddress::getLocalHost),RegTestParams.get().getPort()));
        vPeerGroup.addAddress(new PeerAddress(unchecked(InetAddress::getLocalHost),RegTestParams.get().getPort() + 1));
        vPeerGroup.setMinBroadcastConnections(1);
        vPeerGroup.setUseLocalhostPeerWhenPossible(false);
      }
 else {
        PeerDiscovery hardCodedPeers=new PeerDiscovery(){
          @Override public InetSocketAddress[] getPeers(          long timeoutValue,          TimeUnit timeoutUnit) throws PeerDiscoveryException {
            InetSocketAddress[] result=new InetSocketAddress[2];
            result[0]=new InetSocketAddress("String_Node_Str",params.getPort());
            result[1]=new InetSocketAddress("String_Node_Str",params.getPort());
            return result;
          }
          @Override public void shutdown(){
          }
        }
;
        vPeerGroup.addPeerDiscovery(hardCodedPeers);
        vPeerGroup.setMaxConnections(2);
        vPeerGroup.setConnectTimeoutMillis(10000);
        vPeerGroup.waitForPeersOfVersion(2,GetUTXOsMessage.MIN_PROTOCOL_VERSION).addListener(() -> {
          vPeerGroup.addPeerDiscovery(new DnsDiscovery(params));
          vPeerGroup.setMaxConnections(6);
        }
,Threading.SAME_THREAD);
      }
      vPeerGroup.addEventListener(new AbstractPeerEventListener(){
        @Override public void onPeerConnected(        Peer peer,        int peerCount){
          if (peer.getAddress().getAddr().isLoopbackAddress() && !peer.getPeerVersionMessage().isGetUTXOsSupported()) {
            log.warn("String_Node_Str");
            informationalAlert("String_Node_Str","String_Node_Str" + "String_Node_Str");
            vPeerGroup.setUseLocalhostPeerWhenPossible(false);
            vPeerGroup.setMaxConnections(4);
          }
        }
      }
);
    }
  }
;
  if (bitcoin.isChainFileLocked()) {
    informationalAlert("String_Node_Str","String_Node_Str");
    Platform.exit();
    bitcoin=null;
    walletLoadedLatch.countDown();
    return;
  }
  if (params == MainNetParams.get()) {
    bitcoin.setCheckpoints(getClass().getResourceAsStream("String_Node_Str"));
  }
 else   if (params == TestNet3Params.get()) {
    bitcoin.setCheckpoints(getClass().getResourceAsStream("String_Node_Str"));
  }
  bitcoin.setPeerNodes(new PeerAddress[0]).setBlockingStartup(false).setDownloadListener(MainWindow.bitcoinUIModel.getDownloadListener()).setUserAgent("String_Node_Str","String_Node_Str" + VERSION).restoreWalletFromSeed(restoreFromSeed);
  if (useTor && params != RegTestParams.get())   bitcoin.useTor();
  reached("String_Node_Str");
  bitcoin.addListener(new Service.Listener(){
    @Override public void failed(    Service.State from,    Throwable failure){
      bitcoin=null;
      walletLoadedLatch.countDown();
      CrashWindow.open(failure);
    }
  }
,Threading.SAME_THREAD);
  bitcoin.startAsync();
}