我收到以下错误，因为其中一个元素返回null
javax.xml.ws.WebServiceException: javax.xml.bind.UnmarshalException
- with linked exception:
[javax.xml.stream.XMLStreamException: ParseError at [row,col]:[1,217]
Message: An invalid XML character (Unicode: 0x0) was found in the element content of the document.]
at com.sun.xml.internal.ws.server.sei.EndpointMethodHandler.invoke(Unknown Source)
at com.sun.xml.internal.ws.server.sei.SEIInvokerTube.processRequest(Unknown Source)
at com.sun.xml.internal.ws.api.pipe.Fiber.__doRun(Unknown Source)
at com.sun.xml.internal.ws.api.pipe.Fiber._doRun(Unknown Source)
at com.sun.xml.internal.ws.api.pipe.Fiber.doRun(Unknown Source)
at com.sun.xml.internal.ws.api.pipe.Fiber.runSync(Unknown Source)
at com.sun.xml.internal.ws.server.WSEndpointImpl$2.process(Unknown Source)
at com.sun.xml.internal.ws.transport.http.HttpAdapter$HttpToolkit.handle(Unknown Source)
at com.sun.xml.internal.ws.transport.http.HttpAdapter.handle(Unknown Source)
at com.sun.xml.internal.ws.transport.http.server.WSHttpHandler.handleExchange(Unknown Source)
at com.sun.xml.internal.ws.transport.http.server.WSHttpHandler.handle(Unknown Source)
at com.sun.net.httpserver.Filter$Chain.doFilter(Unknown Source)
at sun.net.httpserver.AuthFilter.doFilter(Unknown Source)
at com.sun.net.httpserver.Filter$Chain.doFilter(Unknown Source)
at sun.net.httpserver.ServerImpl$Exchange$LinkHandler.handle(Unknown Source)
at com.sun.net.httpserver.Filter$Chain.doFilter(Unknown Source)
at sun.net.httpserver.ServerImpl$Exchange.run(Unknown Source)
at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
at java.lang.Thread.run(Unknown Source)
Caused by: javax.xml.bind.UnmarshalException
- with linked exception:
[javax.xml.stream.XMLStreamException: ParseError at [row,col]:[1,217]
Message: An invalid XML character (Unicode: 0x0) was found in the element content of the document.]
at com.sun.xml.internal.bind.v2.runtime.unmarshaller.UnmarshallerImpl.handleStreamException(Unknown Source)
at com.sun.xml.internal.bind.v2.runtime.unmarshaller.UnmarshallerImpl.unmarshal0(Unknown Source)
at com.sun.xml.internal.bind.v2.runtime.BridgeImpl.unmarshal(Unknown Source)
at com.sun.xml.internal.bind.api.Bridge.unmarshal(Unknown Source)
at com.sun.xml.internal.ws.server.sei.EndpointArgumentsBuilder$DocLit.readRequest(Unknown Source)
... 20 more
Caused by: javax.xml.stream.XMLStreamException: ParseError at [row,col]:[1,217]
Message: An invalid XML character (Unicode: 0x0) was found in the element content of the document.
at com.sun.org.apache.xerces.internal.impl.XMLStreamReaderImpl.next(Unknown Source)
at com.sun.xml.internal.ws.util.xml.XMLStreamReaderFilter.next(Unknown Source)
at com.sun.xml.internal.bind.v2.runtime.unmarshaller.StAXStreamConnector.bridge(Unknown Source)
... 24 more
由 Unicode：0x0 表示我有三台服务器作为Web服务运行，它们使用udp消息相互交互。我尝试在reserveRemoteLibrary方法中设置断点，但它没有到达那里。
这是 libraryResponseData 方法中的一点，我收到错误： //这是我收到错误的地方。即使我在reserveRemote方法中设置断点也无法达到它
System.out.println(_mcgillServer.reserveRemoteBook(userName,
password, bookName, authorName));
_result = _mcgillServer.reserveRemoteBook(userName,
password, bookName, authorName);
System.out.println("_mcgillServer :" + _result + ":"
+ _mcgillServer.displayBookList());
/**
* Description: Allows a user to reserve book based on the book name he
* enters in the remote library
*
* @param: User name
* @param: Password
* @param: Book name
* @param: Author Name
* @return: Returns a string with book details telling whether the user was
* able to reserve the book or not.
*/
public String reserveRemoteBook(String userName, String password,
String bookName, String authorName) {
System.out.println("Inside remote"+userName+password+bookName+authorName );
String _result = null;
String _educationalInstitution = null;
String _firstName = null;
String _lastName = null;
String _phoneNumber = null;
StringBuilder _reserveBookStringBuilder = new StringBuilder();
if (checkBookExistence(bookName)) {
Iterator<Student> _userNameIterator = _listOfStudents.iterator();
while (_userNameIterator.hasNext()) {
Student st = (Student) _userNameIterator.next();
if (userName.equals(st.getM_uniqueUsername())
&& password.equals(st.getM_password())) {
_educationalInstitution = st.getM_educationalInstitution();
_firstName = st.getM_firstName();
_lastName = st.getM_lastName();
_phoneNumber = st.getM_phoneNumber();
}
}
ReserveBook _reserveBook = new ReserveBook(userName, bookName,
_educationalInstitution, _firstName, _lastName,
_phoneNumber);
_reserveBookList.add(_reserveBook);
@SuppressWarnings("rawtypes")
Iterator reserveBookListIterator = _reserveBookList.iterator();
while (reserveBookListIterator.hasNext()) {
ReserveBook reserveBookFetchData = (ReserveBook) reserveBookListIterator
.next();
System.out.println(reserveBookFetchData.getM_userName());
System.out.println(" ");
System.out.println(reserveBookFetchData.getM_bookName());
System.out.println(" ");
System.out.println(reserveBookFetchData.getM_Date());
System.out.println(" ");
_reserveBookStringBuilder.append("Books Reserved Successfully");
_result = _reserveBookStringBuilder.toString();
}
int _noOfBook = 0;
for (String s : _bookMap.keySet()) {
String authorTest;
authorTest = _bookMap.get(s).getM_authorName();
if (authorTest.equals(authorName)) {
_noOfBook = _bookMap.get(s).getM_noOfBook();
/*
* if (_bookMap.isEmpty()) {
*
* reserveInterLibrary(userName, password, bookName,
* authorName); }
*/
_noOfBook = _noOfBook - 1;
}
_bookMap.remove(s);
if (_noOfBook > 0) {
Book _book = new Book(bookName, authorName, _noOfBook);
_bookMap.put(bookName, _book);
}
}
// _reserveBookStringBuilder.append("/n");
_reserveBookStringBuilder.append("Library Updated");
// _reserveBookStringBuilder.append("/n");
// _reserveBookStringBuilder.append(_bookMap.toString());
_result = _reserveBookStringBuilder.toString();
}
else {
_result = "error";
}
return _result;
}
/**
* Description: Reserves a book in the remote library if the book is not
* available in the local library
*
* @param: userName,password,bookName,authorName
* @return: Returns a success message and error message
*/
public String reserveInterLibrary(String userName, String password,
String bookName, String authorName) {
String _result = null;// Send final result
final ArrayList<String> result = new ArrayList<String>();
String _educationalInstitution = null;
String _libraryResponse = null;
Iterator<Student> _userNameIterator = _listOfStudents.iterator();
while (_userNameIterator.hasNext()) {
Student st = (Student) _userNameIterator.next();
if (userName.equals(st.getM_uniqueUsername())
&& password.equals(st.getM_password())) {
_educationalInstitution = st.getM_educationalInstitution();
}
}
drms.org.concordia.DrmsService concordiaService = new drms.org.concordia.DrmsService();
final drms.org.concordia.DRMSInterface _concordiaServer = concordiaService
.getDrmsPort();
drms.org.mcgill.DrmsService mcgillService = new drms.org.mcgill.DrmsService();
final drms.org.mcgill.DRMSInterface _mcgillServer = mcgillService
.getDrmsPort();
drms.org.dawson.DrmsService dawsonService = new drms.org.dawson.DrmsService();
final drms.org.dawson.DRMSInterface _dawsonServer = dawsonService
.getDrmsPort();
// Server reference created
// logic to request for book
// logic when request sent by concordia server
if (_educationalInstitution.toLowerCase().equals("concordia")) {
final String _concordiaRequestMessage = _educationalInstitution
+ " " + userName + " " + password + " " + bookName
+ " " + authorName;
Boolean _responseReceived = false;
final Thread t1 = new Thread() {
public void run() {
result.add(_mcgillServer
.libraryResponseData(_mcgillPortNumber));
}
};
t1.setDaemon(true);
t1.start();
System.out.println("Attemping to connect to " + IPAddress
+ ") via UDP port" + _mcgillPortNumber);
result.add("Attemping to connect to " + IPAddress
+ ") via UDP port" + _mcgillPortNumber);
result.add("/n");
System.out.println("Sending data "
+ _concordiaRequestMessage.length()
+ " bytes to server.");
_libraryResponse = _concordiaServer.requestData(
_mcgillPortNumber, _concordiaRequestMessage);
String test = _libraryResponse.trim().toLowerCase();
result.add(_libraryResponse + "from Mcgill Server");
if (test.equals("error")) {
_responseReceived = true;
}
else {
_responseReceived = false;
}
if (_responseReceived) {
final Thread t2 = new Thread() {
public void run() {
result.add(_dawsonServer
.libraryResponseData(_dawsonPortNumber));
}
};
t2.setDaemon(true);
t2.start();
System.out.println("Attemping to connect to " + IPAddress
+ ") via UDP port" + _dawsonPortNumber);
result.add("Attemping to connect to " + IPAddress
+ ") via UDP port" + _dawsonPortNumber);
result.add("/n");
result.add("Sending data "
+ _concordiaRequestMessage.length()
+ " bytes to server.");
_libraryResponse = _concordiaServer.requestData(
_dawsonPortNumber, _concordiaRequestMessage);
result.add(_libraryResponse + "from Dawson Server");
}
}
else if (_educationalInstitution.toLowerCase().equals("mcgill")) {
final String _mcgillRequestMessage = _educationalInstitution
+ " " + userName + " " + password + " " + bookName
+ " " + authorName;
Boolean _responseReceived = false;
final Thread t1 = new Thread() {
@Override
public void run() {
result.add(_concordiaServer
.libraryResponseData(_concordiaPortNumber));
}
};
t1.setDaemon(true);
t1.start();
System.out.println("Attemping to connect to " + IPAddress
+ ") via UDP port" + _concordiaPortNumber);
result.add("Attemping to connect to " + IPAddress
+ ") via UDP port" + _concordiaPortNumber);
result.add("/n");
System.out.println("Sending data "
+ _mcgillRequestMessage.length() + "bytes to server");
_libraryResponse = _mcgillServer.requestData(
_concordiaPortNumber, _mcgillRequestMessage);
result.add(_libraryResponse + "from Concordia server");
if ("error".equals(_libraryResponse.trim().toLowerCase())) {
_responseReceived = true;
}
else {
_responseReceived = false;
}
if (_responseReceived) {
final Thread t2 = new Thread() {
@Override
public void run() {
result.add(_dawsonServer
.libraryResponseData(_dawsonPortNumber));
}
};
t2.setDaemon(true);
t2.start();
System.out.println("Attemping to connect to " + IPAddress
+ ") via UDP port" + _dawsonPortNumber);
result.add("Attemping to connect to " + IPAddress
+ ") via UDP port" + _dawsonPortNumber);
result.add("/n");
result.add("Sending data "
+ _mcgillRequestMessage.length()
+ " bytes to server.");
_libraryResponse = _mcgillServer.requestData(
_dawsonPortNumber, _mcgillRequestMessage);
result.add(_libraryResponse + "from Dawson Server");
}
}
else if (_educationalInstitution.toLowerCase().equals("dawson")) {
final String _dawsonRequestMessage = _educationalInstitution
+ " " + userName + " " + password + " " + bookName
+ " " + authorName;
Boolean _responseReceived = false;
final Thread t1 = new Thread() {
public void run() {
result.add(_concordiaServer
.libraryResponseData(_concordiaPortNumber));
}
};
t1.setDaemon(true);
t1.start();
System.out.println("Attemping to connect to " + IPAddress
+ ") via UDP port" + _concordiaPortNumber);
result.add("Attemping to connect to " + IPAddress
+ ") via UDP port" + _concordiaPortNumber);
result.add("/n");
System.out.println("Sending data "
+ _dawsonRequestMessage.length() + " bytes to server.");
_libraryResponse = _dawsonServer.requestData(
_concordiaPortNumber, _dawsonRequestMessage);
result.add(_libraryResponse + "from Concordia Server");
if ("error".equals(_libraryResponse.trim().toLowerCase())) {
_responseReceived = true;
}
else {
_responseReceived = false;
}
if (_responseReceived) {
final Thread t2 = new Thread() {
public void run() {
result.add(_mcgillServer
.libraryResponseData(_mcgillPortNumber));
}
};
t2.setDaemon(true);
t2.start();
System.out.println("Attemping to connect to " + IPAddress
+ ") via UDP port" + _mcgillPortNumber);
result.add("Attemping to connect to " + IPAddress
+ ") via UDP port" + _mcgillPortNumber);
result.add("Sending data "
+ _dawsonRequestMessage.length()
+ " bytes to server.");
_libraryResponse = _dawsonServer.requestData(
_mcgillPortNumber, _dawsonRequestMessage);
result.add(_libraryResponse + "from mcgill Server");
}
}
_result = result.toString();
return _result;
}
/**
* Description: Return the reserveInterLibrary method with the results of
* reserveBook method Based on the UDP request from the invoked library it
* sends the UDP response whether the requested library method had the book
* or not. If yes it reserves the book and sends a success message
*
*
* @param: Port Number
* @return: Response from the requested server
*/
public String libraryResponseData(int portNumber) {
String _result = null;
try {
@SuppressWarnings("resource")
final DatagramSocket serverSocket = new DatagramSocket(portNumber,
IPAddress);
drms.org.concordia.DrmsService concordiaService = new drms.org.concordia.DrmsService();
final drms.org.concordia.DRMSInterface _concordiaServer = concordiaService
.getDrmsPort();
drms.org.mcgill.DrmsService mcgillService = new drms.org.mcgill.DrmsService();
drms.org.mcgill.DRMSInterface _mcgillServer = mcgillService
.getDrmsPort();
drms.org.dawson.DrmsService dawsonService = new drms.org.dawson.DrmsService();
drms.org.dawson.DRMSInterface _dawsonServer = dawsonService
.getDrmsPort();
byte[] receiveData = new byte[102400];
byte[] sendData = new byte[102400];
while (true) {
receiveData = new byte[102400];
final DatagramPacket receivePacket = new DatagramPacket(
receiveData, receiveData.length);
System.out.println("Waiting for datagram packet");
serverSocket.receive(receivePacket);
final String _request = new String(receivePacket.getData());
String[] splited = _request.split("\\s+");
String _educationalInstitution = splited[0];
String userName = splited[1];
String password = splited[2];
String bookName = splited[3];
String authorName = splited[4];
final InetAddress IPAddress = receivePacket.getAddress();
final int port = receivePacket.getPort();
System.out.println("From: " + IPAddress + ":" + port);
System.out.println("Request Message from: "
+ _request.toUpperCase());
System.out.println(_educationalInstitution);
if (_educationalInstitution.toLowerCase().equals("concordia")) {
if (portNumber == _mcgillPortNumber) {
// This is the point where I get error . Even when i set break points in reserveRemote method am not able to reach it System.out.println(_mcgillServer.reserveRemoteBook(userName,
password, bookName, authorName));
_result = _mcgillServer.reserveRemoteBook(userName,
password, bookName, authorName);
System.out.println("_mcgillServer :" + _result + ":"
+ _mcgillServer.displayBookList());
}
other else if cases follows
System.out.println(_result);
sendData = _result.getBytes();
System.out.println(sendData.length);
final DatagramPacket sendPacket = new DatagramPacket(sendData,
sendData.length, IPAddress, port);
serverSocket.send(sendPacket);
}
}
catch (final SocketException ex) {
ex.printStackTrace();
}
catch (final IOException e) {
e.printStackTrace();
}
return _result;
}