This method is for saving data in database
public Response saveAll(PurchaseOrderHeaderDto purchaseOrderHeaderDto){
try{
s=sf.openSession();
tx=s.beginTransaction();
PurchaseOrderHeader orderDo=importDao(purchaseOrderHeaderDto);
for(int i=0;i<orderDo.getPurchaseItemList().size(); i++){
orderDo.getPurchaseItemList().get(i).setHeaderDetails(orderDo);
s.save(orderDo.getPurchaseItemList().get(i));
}
response.setStatus(200);
response.setMessage("succesfull");
tx.commit();
}
catch(ConstraintViolationException e){
System.out.println(e.getMessage());
response.setStatus(500);
response.setMessage("unsuccesfull");
tx.rollback();
}
finally{
s.close();
}
return response;
}
I am getting this error
Error during managed flush [org.hibernate.exception.DataException: could not execute statement]
I am not getting how to handle this exception(I know it is because of length but i want to handle this exception. Any suggestions are welcomed)
cause you are trying to catch ConstraintViolationException while you are getting DataException.
Try to use code below:
public Response saveAll(PurchaseOrderHeaderDto purchaseOrderHeaderDto) {
try {
s = sf.openSession();
tx = s.beginTransaction();
PurchaseOrderHeader orderDo = importDao(purchaseOrderHeaderDto);
for (int i = 0; i < orderDo.getPurchaseItemList().size(); i++) {
orderDo.getPurchaseItemList().get(i).setHeaderDetails(orderDo);
s.save(orderDo.getPurchaseItemList().get(i));
}
response.setStatus(200);
response.setMessage("succesfull");
tx.commit();
} catch (Exception e) {
System.out.println(e.getMessage());
response.setStatus(500);
response.setMessage("unsuccesfull");
tx.rollback();
} finally {
s.close();
}
return response;
}
this wil catch every exception, you may want to work on that later on, but it should work
I'm working on a WP8.1 WinRT project. I'm downloading a file and trying to open it but i get an error ? What is wrong with my code ?
private async void HandleDownloadAsync(DownloadOperation download, bool start)
{
try
{
Progress<DownloadOperation> progressCallback = new Progress<DownloadOperation>(ProgressCallback);
if (start)
{
await download.StartAsync().AsTask(cts.Token, progressCallback);
}
else
{
await download.AttachAsync().AsTask(cts.Token, progressCallback);
}
ResponseInformation response = download.GetResponseInformation();
}
catch (Exception ex)
{
Debug.WriteLine("Error HandleDownloadAsync: {0}", ex);
}
finally
{
OpenFile();
}
}
private async void OpenFile()
{
try
{
StorageFile fileToLaunch = await KnownFolders.PicturesLibrary.GetFileAsync(medNameChosen");
if (destinationFile.ToString() != null)
{
await Windows.System.Launcher.LaunchFileAsync(fileToLaunch);
}
}
catch (Exception ex)
{
Debug.WriteLine("Error: {0}", ex);
}
}
After i run the code below i get the following error:
Error: System.Runtime.InteropServices.COMException (0x80004005): Error HRESULT E_FAIL has been returned from a call to a COM component.
at Windows.System.Launcher.LaunchFileAsync(IStorageFile file)
at PM.Page.<OpenFile>d__1f.MoveNext()
I am writing a Java application which reads the data from MySQL and stores it in Cassandra as Sqoop does not support a direct import to Cassandra. I am using Producer-Consumer framework to achieve the same due to high number of records (in millions) in MySQL. But I am getting ReadTimeOut Exception (com.datastax.driver.core.exceptions.DriverException: Timeout during read). I have one Producer class which reads the data from MySQL and puts it into one queue. There is one consumer class which reads the data from that queue and pushes it to Cassndra. There is one manager class which acts as a coordination bridge between these two classes.
Producer class :-
public class MySQLPrintJobProducer implements Runnable {
private BlockingQueue<PrintJobDAO> printerJobQueue = null;
private Connection conn = null;
public MySQLPrintJobProducer(BlockingQueue<PrintJobDAO> printerJobQueue) throws MySQLClientException {
this.printerJobQueue = printerJobQueue;
connect();
}
private void connect() throws MySQLClientException {
try {
Class.forName(MySQLClientConstants.MYSQL_JDBC_DRIVER);
conn = DriverManager.getConnection("jdbc:mysql://mysqlserverhose/mysqldb?user=mysqluser&password=mysqlpasswd");
} catch (ClassNotFoundException e) {
throw new MySQLClientException(ExceptionUtils.getStackTrace(e));
} catch (SQLException e) {
throw new MySQLClientException(ExceptionUtils.getStackTrace(e));
}
}
public void run() {
ResultSet rs = null;
Statement stmt = null;
PreparedStatement pStmt = null;
try {
stmt = conn.createStatement();
// Get total number of print jobs stored.
rs = stmt.executeQuery(MySQLClientConstants.PRINT_JOB_COUNT_QUERY);
int totalPrintJobs = 0;
if(rs != null) {
while(rs.next()) {
totalPrintJobs = rs.getInt(1);
}
}
// Determine the number of iterations.
int rowOffset = 1;
int totalIteration = ((totalPrintJobs / ExportManagerConstants.DATA_TRANSFER_BATCH_SIZE) + 1);
pStmt = conn.prepareStatement(MySQLClientConstants.PRINT_JOB_FETCH_QUERY);
int totalRecordsFetched = 0;
// Iterate over to fetch Print Job Records in bathces and put it into the queue.
for(int i = 1; i <= totalIteration; i++) {
pStmt.setInt(1, rowOffset);
pStmt.setInt(2, ExportManagerConstants.DATA_TRANSFER_BATCH_SIZE);
System.out.println("In iteration : " + i + ", Row Offset : " + rowOffset);
rs = pStmt.executeQuery();
synchronized (this.printerJobQueue) {
if(this.printerJobQueue.remainingCapacity() > 0) {
while(rs.next()) {
totalRecordsFetched = rs.getRow();
printerJobQueue.offer(new PrintJobDAO(rs.getInt(1), rs.getInt(2), rs.getString(3), rs.getDate(4),
rs.getTimestamp(5), rs.getInt(6), rs.getInt(7), rs.getInt(8), rs.getInt(9),
rs.getInt(10), rs.getFloat(11), rs.getFloat(12), rs.getInt(13), rs.getFloat(14), rs.getInt(15),
rs.getDouble(16), rs.getDouble(17), rs.getDouble(18), rs.getDouble(19), rs.getDouble(20),
rs.getFloat(21)));
this.printerJobQueue.notifyAll();
}
System.out.println("In iteration : " + i + ", Records Fetched : " + totalRecordsFetched +
", Queue Size : " + printerJobQueue.size());
rowOffset += ExportManagerConstants.DATA_TRANSFER_BATCH_SIZE;
} else {
System.out.println("Print Job Queue is full, waiting for Consumer thread to clear.");
this.printerJobQueue.wait();
}
}
}
} catch (SQLException e) {
System.err.println(ExceptionUtils.getStackTrace(e));
} catch (InterruptedException e) {
System.err.println(ExceptionUtils.getStackTrace(e));
} finally {
try {
if(null != rs) {
rs.close();
}
if(null != stmt) {
stmt.close();
}
if(null != pStmt) {
pStmt.close();
}
} catch (SQLException e) {
System.err.println(ExceptionUtils.getStackTrace(e));
}
}
ExportManager.setProducerCompleted(true);
}
}
Consumer Class :-
public class CassandraPrintJobConsumer implements Runnable {
private Cluster cluster = null;
private Session session = null;
private BlockingQueue<PrintJobDAO> printerJobQueue = null;
public CassandraPrintJobConsumer(BlockingQueue<PrintJobDAO> printerJobQueue) throws CassandraClientException {
this.printerJobQueue = printerJobQueue;
cluster = Cluster.builder().withPort(9042).addContactPoint("http://cassandrahost").build();
}
public void run() {
int printJobConsumed = 0;
int batchInsertCount = 1;
if(cluster.isClosed()) {
connect();
}
session = cluster.connect();
PreparedStatement ps = session.prepare(CassandraClientConstants.INSERT_PRINT_JOB_DATA);
BatchStatement batch = new BatchStatement();
synchronized (this.printerJobQueue) {
while(true) {
if(!this.printerJobQueue.isEmpty()) {
for(int i = 1; i <= ExportManagerConstants.DATA_TRANSFER_BATCH_SIZE; i++) {
PrintJobDAO printJob = printerJobQueue.poll();
batch.add(ps.bind(printJob.getJobID(), printJob.getUserID(), printJob.getType(), printJob.getGpDate(), printJob.getDateTimes(),
printJob.getAppName(), printJob.getPrintedPages(), printJob.getSavedPages(), printJob.getPrinterID(), printJob.getWorkstationID(),
printJob.getPrintedCost(), printJob.getSavedCost(), printJob.getSourcePrinterID(), printJob.getSourcePrinterPrintedCost(),
printJob.getJcID(), printJob.getCoverageC(), printJob.getCoverageM(), printJob.getCoverageY(), printJob.getCoverageK(),
printJob.getCoverageTotal(), printJob.getPagesAnalyzed()));
printJobConsumed++;
}
session.execute(batch);
System.out.println("After Batch - " + batchInsertCount + ", record insert count : " + printJobConsumed);
batchInsertCount++;
this.printerJobQueue.notifyAll();
} else {
System.out.println("Print Job Queue is empty, nothing to export.");
try {
this.printerJobQueue.wait();
} catch (InterruptedException e) {
System.err.println(ExceptionUtils.getStackTrace(e));
}
}
if(ExportManager.isProducerCompleted() && this.printerJobQueue.isEmpty()) {
break;
}
}
}
}
}
Manager Class :-
public class ExportManager {
private static boolean isInitalized = false;
private static boolean producerCompleted = false;
private static MySQLPrintJobProducer printJobProducer = null;
private static CassandraPrintJobConsumer printJobConsumer = null;
private static BlockingQueue<PrintJobDAO> printJobQueue = null;
public static boolean isProducerCompleted() {
return producerCompleted;
}
public static void setProducerCompleted(boolean producerCompleted) {
ExportManager.producerCompleted = producerCompleted;
}
private static void init() throws MySQLClientException, CassandraClientException {
if(!isInitalized) {
printJobQueue = new LinkedBlockingQueue<PrintJobDAO>(ExportManagerConstants.DATA_TRANSFER_BATCH_SIZE * 2);
printJobProducer = new MySQLPrintJobProducer(printJobQueue);
printJobConsumer = new CassandraPrintJobConsumer(printJobQueue);
isInitalized = true;
}
}
public static void exportPrintJobs() throws ExportException {
try {
init();
} catch (MySQLClientException e) {
throw new ExportException("Print Job Export failed.", e);
} catch (CassandraClientException e) {
throw new ExportException("Print Job Export failed.", e);
}
Thread producerThread = new Thread(printJobProducer);
Thread consumerThread = new Thread(printJobConsumer);
consumerThread.start();
producerThread.start();
}
}
TestNG class :-
public class TestExportManager {
#Test
public void testExportPrintJobs() {
try {
ExportManager.exportPrintJobs();
Thread.currentThread().join();
} catch (ExportException e) {
Assert.fail("ExportManager.exportPrintJobs() failed.", e);
} catch (InterruptedException e) {
Assert.fail("ExportManager.exportPrintJobs() failed.", e);
}
}
}
I have also made some configuration changes by following this link. Still I am getting following exception after inserting 18000 - 20000 records.
Exception in thread "Thread-2" com.datastax.driver.core.exceptions.NoHostAvailableException: All host(s) tried for query failed (tried: /192.168.10.80
(com.datastax.driver.core.exceptions.DriverException: Timeout during read))
at com.datastax.driver.core.exceptions.NoHostAvailableException.copy(NoHostAvailableException.java:64)
at com.datastax.driver.core.DefaultResultSetFuture.extractCauseFromExecutionException(DefaultResultSetFuture.java:256)
at com.datastax.driver.core.DefaultResultSetFuture.getUninterruptibly(DefaultResultSetFuture.java:172)
at com.datastax.driver.core.SessionManager.execute(SessionManager.java:91)
at com.incendiary.ga.client.cassandra.CassandraPrintJobConsumer.run(CassandraPrintJobConsumer.java:108)
at java.lang.Thread.run(Unknown Source)
Caused by: com.datastax.driver.core.exceptions.NoHostAvailableException: All host(s) tried for query failed (tried: /192.168.10.80 (com.datastax.drive
r.core.exceptions.DriverException: Timeout during read))
at com.datastax.driver.core.RequestHandler.sendRequest(RequestHandler.java:100)
at com.datastax.driver.core.RequestHandler$1.run(RequestHandler.java:171)
at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(Unknown Source)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
... 1 more
I am not able to figure out the actual reason for the issue. I could not find any exception in Cassandra system log. I am using Apache Cassandra 2.0.7 and cassandra-driver-core 2.0.1.
You can increase read time out in you driver side . By using withSocket method in this you have SocketOption class using that you can read time out .By default is read time out is 10 millisecond .
I'm implementing a function that detects if there is a webcam. This piece of code works fine in windows and I had no problem with it in linux centos OS. Now I'm trying to run the same code in Ubuntu, here an exception is thrown.
Exception in thread "main" java.lang.NullPointerException
at CameraProperties.CheckForCameraPlugin.check(CheckForCameraPlugin.java:51)
at Main.Main.main(Main.java:39)
The code is given below.
public boolean check()
{
boolean b = true;
service = Executors.newFixedThreadPool(1);
task = service.submit(new InitialCameraChecker());
try
{
final String str;
// waits the 10 seconds for the Callable.call to finish.
str = task.get();
if (str.matches("nodevice"))
{
b = false;//Return false if no camera device found
}
else
{
b = true;
}
}
catch (InterruptedException | ExecutionException ex)
{
msgbox.showJoptionPane(15);
}
service.shutdownNow();
return b;
}
The callable class is given below
class InitialCameraChecker implements Callable<String>
{
private List<Integer> devices = new ArrayList<Integer>();
private final static String VERSION_ID = "1.0.0";
private String res;
//Checking for the Camera
public String call()
{
try
{
loadWebcam();
discoverDevices();
if (devices.isEmpty())
{
res = "nodevice";//No we cam device found
}
else
{
res = "founddevice";//Found Web Cam Device
}
}
catch (Exception ex)
{
System.out.println("Exception_logout" + ex.toString());
}
return res;
}
//Discovering the camera device
private void discoverDevices()
{
for (int i = 0; i < 10; i++)
{
CvCapture cap = null;
try
{
cap = cvCreateCameraCapture(i);
int res = cvGrabFrame(cap);
if (res > 0)
{
devices.add(i);
break;
}
}
catch (Exception e)
{
System.out.println("Exception in camaracheck Thread1");
}
finally
{
if (cap != null)
{
try
{
cvReleaseCapture(cap.pointerByReference());
}
catch (Exception e)
{
e.printStackTrace();
}
}
}
}
}
//Loading the dlls for starting the camera
private void loadWebcam()
{
String tmpDir = System.getProperty("java.io.tmpdir");
File faPath = new File(tmpDir + File.separator + "WebcamApplet_" + VERSION_ID.replaceAll("\\.", "-"));
System.setProperty("jna.library.path", faPath.getAbsolutePath());
}
}
Please tell me what is the problem. This works fine in windows.
I'm working on parsing JSON on BlackBerry using org.json.me, but I can't parsing the result. Simulator Console says: No Stack Trace
Here's my code to parsing JSON after receiving JSON string from my restclient
try {
JSONObject outer=new JSONObject(data);
JSONArray ja = outer.getJSONArray("status");
JSONArray arr=ja.getJSONArray(0);
System.out.println(arr);
} catch (JSONException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
And here's the piece code to get JSON from the server
public PromoThread(final String url, final ResponseCallback callback){
Thread t = new Thread(new Runnable(){
public void run() {
waitScreen = new WaitPopupScreen();
System.out.println("Log >> Promo thread run...");
synchronized (UiApplication.getEventLock()){
UiApplication.getUiApplication().pushScreen(waitScreen);
}
//network call
try {
conn = (HttpConnection) new ConnectionFactory().getConnection(url).getConnection();
conn.setRequestMethod(HttpConnection.GET);
conn.setRequestProperty("User-Agent", "Profile/MIDP-1.0 Confirguration/CLDC-1.0");
if (conn.getResponseCode() == HttpConnection.HTTP_OK) {
in = conn.openInputStream();
// parser.parse(in, handler);
//buff.append(IOUtilities.streamToBytes(in));
//result = buff.toString();
results = new String(IOUtilities.streamToBytes(in));
//System.out.println("Log >> Result: " + results);
UiApplication.getUiApplication().invokeLater(
new Runnable() {
public void run() {
//UiApplication.getUiApplication().popScreen(waitScreen);
callback.callback(results, waitScreen);
}
});
}
} catch (Exception ex) {
ex.printStackTrace();
} finally {
try {
if (in != null) {
in.close();
}
conn.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
});
//start thread
t.start();
}
Thanks for your help