I created MapProperty to read the information from the database as below.
The command runs fine with Map,ArrayList normal but error MapProperty.I want member to be ListProperty type so I can bind it to control
public MapProperty<String, ListProperty<String>> mapTaxonomy() {
MapProperty<String, ListProperty<String>> mapTaxonomy = new SimpleMapProperty<>();
try {
preparedStatement = connection.prepareStatement("");
resultSet = preparedStatement.executeQuery();
while (resultSet.next()) {
String taxonomy = resultSet.getString("Taxonomy");
ListProperty<String> memberSelector = mapTaxonomy.get(taxonomy);
if (memberSelector == null) {
memberSelector = new SimpleListProperty<>();
mapTaxonomy.put(taxonomy, memberSelector);
}
memberSelector.add(resultSet.getString("Selector"));
}
} catch (SQLException ex) {
Logger.getLogger(ParserService.class.getName()).log(Level.SEVERE, null, ex);
}
return mapTaxonomy;
}
#Override
public void initialize(URL location, ResourceBundle resources) {
MapProperty<String, ListProperty<String>> mapTaxonomy = mapTaxonomy();
}
After I run the following error statement,please help me
Caused by: java.lang.UnsupportedOperationException
at java.util.AbstractMap.put(AbstractMap.java:209)
at javafx.beans.binding.MapExpression.put(MapExpression.java:262)
at touya.akira.storages.database.table.parser.ParserService.mapTaxonomy(ParserService.java:70)
at touya.akira.parser.styles.fixed.method.pagination.PaginationPresenter.initialize(PaginationPresenter.java:64)
at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:2548)
... 67 more
The default value of a SimpleMapProperty is a empty unmodifiable map. An exception is thrown when you try to modify it. Specify a modifiable ObservableMap as initial value to fix this issue.
MapProperty<String, ListProperty<String>> mapTaxonomy = new SimpleMapProperty<>(FXCollections.observableHashMap());
Related
I want to serialize the result of query in data table
public static IList<DTO.Customer> GetData()
{
using (DBDataContext odb = new DBDataContext())
{
return ConvertDALtoDTO(odb.Customers.ToList());
}
}
public static List<DTO.Customer> ConvertDALtoDTO(List<DAL.Customer> d)
{
try
{
string SerializedObj = JsonConvert.SerializeObject(d,Formatting.Indented, new JsonSerializerSettings { ReferenceLoopHandling = ReferenceLoopHandling.Ignore });
List<DTO.Customer> result = JsonConvert.DeserializeObject<List<DTO.Customer>>(SerializedObj);
return result;
}
catch (Exception ex)
{
return null;
}
}
But i encountering an "out of Memory" error and after executing the Code the system memory is full and the error below is displayed
"Object reference not set to an instance of an object"
I built a web application using spring MVC, everything is working fine except the file upload in which I got random FileNotFoundExceptions. I found some solutions online like using a different tmp folder but I keep getting random error.
My code is:
#RequestMapping(value="/upload", method=RequestMethod.POST)
public #ResponseBody String handleFileUpload(#RequestParam("file") final MultipartFile multipartFile,
#RequestHeader("email") final String email, #RequestHeader("password") String password){
if (authenticateUser(email, password)) {
if (!multipartFile.isEmpty()) {
System.out.println("Start processing");
Thread thread = new Thread(){
public void run(){
ProcessCSV obj = new ProcessCSV();
try {
File file = multipartToFile(multipartFile);
if(file !=null) {
obj.extractEvents(file, email, cluster, session);
}
else {
System.out.println("null File");
}
} catch (IOException e) {
System.out.println("File conversion error");
e.printStackTrace();
}
}
};
thread.start();
return "true";
} else {
return "false";
}
}
else {
return "false";
}
}
and:
public File multipartToFile(MultipartFile multipartFile) throws IOException {
File uploadFile = null;
if(multipartFile != null && multipartFile.getSize() > 0) {
uploadFile = new File("/tmp/" + multipartFile.getOriginalFilename());
FileOutputStream fos = null;
try {
uploadFile.createNewFile();
fos = new FileOutputStream(uploadFile);
IOUtils.copy(multipartFile.getInputStream(), fos);
} catch (FileNotFoundException e) {
System.out.println("File conversion error");
e.printStackTrace();
} catch (IOException e) {
System.out.println("File conversion error");
e.printStackTrace();
} finally {
if (fos != null) {
try {
fos.close();
} catch (IOException e) {
System.out.println("File conversion error");
e.printStackTrace();
}
}
}
}
else {
System.out.println("null MultipartFile");
}
return uploadFile;
}
and the configuration file:
multipart.maxFileSize: 100MB
multipart.maxRequestSize: 100MB
multipart.location = ${user.home}
server.port = 8090
I used different versions of the multipartToFile function, one was using multipartfile.transferTo() but I was getting the same random error. Any advice?
Thank you
EDIT stack trace:
java.io.IOException: java.io.FileNotFoundException: /Users/aaa/upload_07720775_4b37_4b86_b370_40280388f3a4_00000003.tmp (No such file or directory)
at org.apache.catalina.core.ApplicationPart.write(ApplicationPart.java:121)
at org.springframework.web.multipart.support.StandardMultipartHttpServletRequest$StandardMultipartFile.transferTo(StandardMultipartHttpServletRequest.java:260)
at main.RESTController.multipartToFile(RESTController.java:358)
at main.RESTController$1.run(RESTController.java:241)
Caused by: java.io.FileNotFoundException: /Users/aaa/upload_07720775_4b37_4b86_b370_40280388f3a4_00000003.tmp (No such file or directory)
at java.io.FileInputStream.open0(Native Method)
at java.io.FileInputStream.open(FileInputStream.java:195)
at java.io.FileInputStream.<init>(FileInputStream.java:138)
at org.apache.tomcat.util.http.fileupload.disk.DiskFileItem.write(DiskFileItem.java:392)
at org.apache.catalina.core.ApplicationPart.write(ApplicationPart.java:119)
... 3 more
I had just had a night of terror with this error. I found out that MultiPartFile is only recognisable to and by the #Controller class. So if you pass it to another bean which is not a controller, Spring will not be able to help you. It somewhat makes sense that the #Controller is tightly bound to the front screen (communication from the browser to the system - Controllers are the entry point from the browser). So any conversation must happen there in the Controller.
In my case, I did something like the following:
#Controller
public class FileUploadingController{
#PostMapping("/uploadHistoricData")
public String saveUploadedDataFromBrowser(#RequestParam("file") MultipartFile file) {
try {
String pathToFile = "/home/username/destination/"
new File(pathToFile).mkdir();
File newFile = new File(pathToFile + "/uploadedFile.csv");
file.transferTo(newFile); //transfer the uploaded file data to a java.io.File which can be passed between layers
dataService.processUploadedFile( newFile);
} catch (IOException e) {
//handle your exception here please
}
return "redirect:/index?successfulDataUpload";
}
}`
I had the same problem, it looks like MultipartFile is using different current dir internally, so all not absolute paths are not working.
I had to convert my path to an absolute path and then it worked.
It is working inside #RestController and in other beans too.
Path path = Paths.get(filename).toAbsolutePath();
fileToImport.transferTo(path.toFile());
fileToImport is MultipartFile.
I am trying to replace fragment with another inside a onItemClick of list view and i want to send a selected item name from list fragment to another fragment but its showing null pointer exception
#Override
public void onItemClick(AdapterView arg0, View view, int position,
long id)
{
try
{
Log.e("----- inside onItemClick -----", citySelected);
MapVisibleFragment newFragment = new MapVisibleFragment();
Bundle args = new Bundle();
args.putString("CITYNAME", citySelected);
newFragment.setArguments(args);
((BaseContainerFragment) getParentFragment()).replaceFragment(
newFragment, true);
} catch (Exception e)
{
e.printStackTrace();
}
}
but the same concept is working inside button click for the below one
try
{
ListFragmentFromDBRecords2 newFragment = new ListFragmentFromDBRecords2();
Bundle args = new Bundle();
args.putStringArrayList("names", allData);
newFragment.setArguments(args);
((BaseContainerFragment) getParentFragment()).replaceFragment(
newFragment, true);
Log.d("--->>>>", allData.toString());
}
catch (Exception e)
{
e.printStackTrace();
}
Based on your comment
((BaseContainerFragment) getParentFragment())
is null for you. Check why getParentFragment() method returns null.
I am having some troubles running an Xquery with Saxon9HE, which has a reference to an external module.
I would like Saxon to resolve the module with a relative path rather absolute.
the module declaration
module namespace common = "http://my-xquery-utils";
from the main xquery
import module namespace common = "http://my-xquery-utils" at "/home/myself/common.xquery";
from my java code
public class SaxonInvocator {
private static Processor proc = null;
private static XQueryEvaluator xqe = null;
private static DocumentBuilder db = null;
private static StaticQueryContext ctx = null;
/**
* Utility for debug, should not be called outside your IDE
*
* #param args xml, xqFile, xqParameter
*/
public static void main(String[] args) {
XmlObject instance = null;
try {
instance = XmlObject.Factory.parse(new File(args[0]));
} catch (XmlException ex) {
Logger.getLogger(SaxonInvocator.class.getName()).log(Level.SEVERE, null, ex);
} catch (IOException ex){
Logger.getLogger(SaxonInvocator.class.getName()).log(Level.SEVERE, null, ex);
}
System.out.print(transform(instance, args[1], args[2]));
}
public static String transform(XmlObject input, String xqFile, String xqParameter) {
String result = null;
try {
proc = new Processor(false);
proc.getUnderlyingConfiguration().getOptimizer().setOptimizationLevel(0);
ctx = proc.getUnderlyingConfiguration().newStaticQueryContext();
ctx.setModuleURIResolver(new ModuleURIResolver() {
#Override
public StreamSource[] resolve(String moduleURI, String baseURI, String[] locations) throws XPathException {
StreamSource[] modules = new StreamSource[locations.length];
for (int i = 0; i < locations.length; i++) {
modules[i] = new StreamSource(getResourceAsStream(locations[i]));
}
return modules;
}
});
db = proc.newDocumentBuilder();
XQueryCompiler comp = proc.newXQueryCompiler();
XQueryExecutable exp = comp.compile(getResourceAsStream(xqFile));
xqe = exp.load();
ByteArrayInputStream bais = new ByteArrayInputStream(input.xmlText().getBytes("UTF-8"));
StreamSource ss = new StreamSource(bais);
XdmNode node = db.build(ss);
xqe.setExternalVariable(
new QName(xqParameter), node);
result = xqe.evaluate().toString();
} catch (SaxonApiException e) {
e.printStackTrace();
} catch (UnsupportedEncodingException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
return result;
}
public static InputStream getResourceAsStream(String resource) {
InputStream stream = SaxonInvocator.class.getResourceAsStream("/" + resource);
if (stream == null) {
stream = SaxonInvocator.class.getResourceAsStream(resource);
}
if (stream == null) {
stream = SaxonInvocator.class.getResourceAsStream("my/project/" + resource);
}
if (stream == null) {
stream = SaxonInvocator.class.getResourceAsStream("/my/project/" + resource);
}
return stream;
}
}
If a change it into a relative path like
import module namespace common = "http://my-xquery-utils" at "common.xquery";
I get
Error on line 22 column 1
XQST0059: java.io.FileNotFoundException
I am not sure how the ModuleURIResolver should be used.
Saxon questions are best asked on the Saxon forum at http://saxonica.plan.io - questions asked here will probably be noticed eventually but sometimes, like this time, they aren't our first priority.
The basic answer is that for the relative URI to resolve, the base URI needs to be known, which means that you need to ensure that the baseURI property in the XQueryCompiler is set. This happens automatically if you compile the query from a File, but not if you compile it from an InputStream.
If you don't know a suitable base URI to set, the alternative is to write a ModuleURIResolver, which could for example fetch the module by making another call on getResourceAsStream().
Can anybody help telling me what is wrong with my code? I am trying to connect to SQLite database, and executing some queries. when trying to create and open the database, create and insert the table, no exception returned. but when I try to execute delete statement,
DatabaseIOException: File system error (12)
always returned. I don't know the cause of the exception exactly. would you tell me what usually cause this kind of exception? I don't even know when I need to close the database and when I don't need to. this solution also makes me confused.
here is my code:
public class DatabaseManager {
Logger log = new Logger();
Database db;
public DatabaseManager() {
createDatabase();
}
private void createDatabase() {
// Determine if an SDCard is present
boolean sdCardPresent = false;
String root = null;
Enumeration enum = FileSystemRegistry.listRoots();
while (enum.hasMoreElements()) {
root = (String) enum.nextElement();
if(root.equalsIgnoreCase("sdcard/")) {
sdCardPresent = true;
}
}
if(!sdCardPresent) {
alert("This application requires an SD card to be present. Exiting application...");
}
else {
try {
URI uri = URI.create("/SDCard/databases/MyAdvanceUI/myadvanceui.db");
db = DatabaseFactory.openOrCreate(uri);
db.close();
//alert("Database OK!");
} catch (Exception e) {
// TODO Auto-generated catch block
//alert("Exception in createDatabase(): " + e);
}
}
}
private void alert(final String message) {
UiApplication.getUiApplication().invokeLater(new Runnable() {
public void run() {
Dialog.inform(message);
System.exit(0);
}
});
}
private void createTableTask() {
try {
URI uri = URI.create("/SDCard/databases/MyAdvanceUI/myadvanceui.db");
db = DatabaseFactory.open(uri);
Statement st = db.createStatement("CREATE TABLE IF NOT EXISTS t_task (id INTEGER PRIMARY KEY AUTOINCREMENT, "
+ "client TEXT, task TEXT)");
st.prepare();
st.execute();
st.close();
db.close();
//alert("Table Task created!");
} catch (Exception e) {
// TODO: handle exception
//alert("Exception in createTableTask(): " + e);
}
}
private void insertTableTask() {
String[] clients = { "Budi Setiawan", "Dian Kusuma", "Joko Ahmad", "Titi Haryanto", "Wahyu" };
String[] tasks = {
"Penawaran terhadap instalasi server",
"Follow up untuk keperluan produk terbaru",
"Pendekatan untuk membina relasi",
"Penawaran jasa maintenance",
"Penawaran terhadap instalasi database"
};
try {
URI uri = URI.create("/SDCard/databases/MyAdvanceUI/myadvanceui.db");
db = DatabaseFactory.open(uri);
for(int i = 0; i < clients.length; i++) {
Statement st = db.createStatement("INSERT INTO t_task (client, task) VALUES (?, ?)");
st.prepare();
st.bind(1, clients[i]);
st.bind(2, tasks[i]);
st.execute();
st.close();
}
db.close();
} catch (Exception e) {
// TODO: handle exception
//alert("Exception in insertTableTask(): " + e);
}
}
public void loadInitialData() {
createTableTask();
insertTableTask();
}
public Cursor getTasks() {
// TODO Auto-generated method stub
Cursor results = null;
try {
URI uri = URI.create("/SDCard/databases/MyAdvanceUI/myadvanceui.db");
db = DatabaseFactory.open(uri);
Statement st = db.createStatement("SELECT client, task FROM t_task");
st.prepare();
results = st.getCursor();
return results;
} catch (Exception e) {
// TODO: handle exception
//alert("Exception: " + e);
}
return results;
}
public void delete(String string) {
// TODO Auto-generated method stub
try {
URI uri = URI.create("/SDCard/databases/MyAdvanceUI/myadvanceui.db");
db = DatabaseFactory.open(uri);
Statement st = db.createStatement("DELETE FROM t_task WHERE client=?");
st.prepare();
st.bind(1, string);
st.execute();
} catch (Exception e) {
// TODO: handle exception
alert("Exception: " + e);
}
}
}
thank you for your help.
I don't see that you close the statement and close the database after select and delete actions. Most probably you can't open database because it wasn't closed correctly.
Big warning SD card isn't available when user mounted devices to PC as external drive. Some devices are going without SD card preinstalled. DB operations are really slow on 5 OS devices. Your alert method code wan't close db what could be issue to open it after on the next application start.
Warning As #pankar mentioned in comment you should add finally {} where you will close resources for sure. In your current implementation if you get exception in execution you will never close database.
Big improvements You don't need to create and prepare statement every loop. Just do it before for. Do bind and execute every loop. And close statement after for.
Improvements You could keep one opened db during application run cycle. It will save you some line of code and time for opening closing.
Notation It's bad practice to have parameter named like 'string'. I would rename it to something more meaningful.