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Exception in thread "pool-1-thread-1" null pointer Exception NoSuchMethodError

I am working on a multi threaded application where i get some request from JMS, threads are running to receive the message. Here how my thread is working:
Model mapper in the try block is causing the issue i think:
patientAdder.addPatient(patientAddMessage, authResult, queueSender, baseUrl, modelMapper);
here is complete code:
Executors.newSingleThreadExecutor().execute(new Runnable() {
public void run() {
while (true) {
SonicQueueMessageSender queueSender = null;
try {
queueSender = new SonicQueueMessageSender(queueConnProvider);
} catch (JMSException e3) {
// TODO Auto-generated catch block
e3.printStackTrace();
}
String patientAddMessage = null;
try {
patientAddMessage = new SonicMessageReceiver(connectionProvider)
.getAddJsonMessage("MirthMessage");
} catch (JMSException e2) {
// TODO Auto-generated catch block
e2.printStackTrace();
}
final AuthModel auth = new AuthModel();
String authResult = null;
final PatientAdder patientAdder = new PatientAdder();
SecurityTokenModel securityToken = null;
String authPostString = null;
try {
authPostString = new ObjectMapper()
.writeValueAsString(auth);
} catch (JsonGenerationException e) {
e.printStackTrace();
} catch (JsonMappingException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
System.out.println("Auth post string is: "+ authPostString);
System.out.println("base url is: " + baseUrl);
String authPostOutput = client
.doGetAuthRestPost(authPostString, url);
try {
securityToken = getAuth(authPostOutput);
} catch (JsonParseException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
} catch (JsonMappingException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
} catch (IOException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
}
authResult = securityToken.getAccessToken();
try {
patientAdder.addPatient(patientAddMessage, authResult, queueSender, baseUrl, modelMapper);
} catch (JsonParseException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (JsonMappingException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
// poster.postMessage(patientAddMessage, authResult);
catch (IllegalAccessException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (InvocationTargetException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (NoSuchMethodException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}catch(Exception e){
e.printStackTrace();
}
}
}
});
I need to map the message i'm getting in request to a bean class and for that i'm creating a ModelMapper class object that has a function to map properties but when i try to create new object of my mapper class i'm getting a NPE:
Exception in thread "pool-1-thread-1" java.lang.NullPointerException
at com.prnreferral.util.commons.ModelMapper.mapCanonicalMessageToPatientModel(ModelMapper.java:82)
at com.prnreferral.patientprocess.add.PatientAdder.addPatient(PatientAdder.java:52)
at com.prnreferral.patientprocess.add.PIXSAddPatient$1.run(PIXSAddPatient.java:148)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1110)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:603)
at java.lang.Thread.run(Thread.java:722)
I'm sure that object is created as i checked it by adding some conditions, but there is something that i'm missing causing this issue
I also tried to add a new function to check if there is any issue with this function, but getting
Exception in thread "pool-1-thread-1" java.lang.NoSuchMethodError: com.prnreferral.util.commons.ModelMapper.printString()V
at com.prnreferral.patientprocess.add.PatientAdder.addPatient(PatientAdder.java:49)
at com.prnreferral.patientprocess.add.PIXSAddPatient$2.run(PIXSAddPatient.java:173)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1110)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:603)
at java.lang.Thread.run(Thread.java:722)
I'm stuck on this issue, no idea what to do, can anyone help me. Thanks in advance.

Notify client in client server application

first of all, I'm rather new to socket programming to go easy on me ;).
I have a Java program that uses client-server programming to communicate between 1 or more clients and the server. So the clients can send any number of messages to the server where the messages are dealt with and all is fine so far. Now I want to notify the clients of e.g. database changes on the server side. So for example if one client changes for example table A, the other clients should also be notified about this change.
What I have so far is the following (server):
ExecutorService executor = null;
try (ServerSocket socket = new ServerSocket(port);)
{
executor = Executors.newFixedThreadPool(getThreadCount(5));
while(true)
{
Socket clientSocket = socket.accept();
Runnable worker = new PCRequestMapper(clientSocket);
executor.execute(worker);
}
}
catch(IOException ioe)
{
ioe.printStackTrace();
}
finally
{
if(executor != null)
{
executor.shutdown();
}
}
The request mapper class then looks like this:
public class PCRequestMapper implements Runnable
{
private Socket client = null;
private static Map<Integer, PCRequestData> requestData = null;
public PCRequestMapper(Socket client)
{
this.client = client;
}
#Override
public void run()
{
try (ObjectInputStream in = new ObjectInputStream(
client.getInputStream());
ObjectOutputStream writer = new ObjectOutputStream(
client.getOutputStream());)
{
System.out.println("Thread started in PCRequestHandler with name: "
+ Thread.currentThread().getName());
Object recObj = in.readObject();
// ToDo Do something
PCBaseRequest req = (PCBaseRequest) recObj;
System.out.println("Req type: " + req.getRequestType() + " name: "
+ req.getName());
PCRequestData data = requestData.get(req.getRequestType());
if(data == null)
{
PCException ex = new PCException();
ex.setStackTrace(new Throwable().getStackTrace());
PCBaseReply reply = getErrorReply("No mapped request handler found in services.xml for request: "+req.getRequestType()+" - "+req.getName(),
PCException.NO_MAPPED_HANDLER, ex);
writer.writeObject(reply);
}
else
{
Class<?> c = Class.forName(data.getMappedClass());
Constructor<?> cons = c.getConstructor();
PCIRequestHandler object = (PCIRequestHandler)cons.newInstance();
PCBaseReply reply = object.heyHo(req);
System.out.println("Writing reply: "+reply.getClass());
writer.writeObject(reply);
}
} catch (IOException ioe)
{
ioe.printStackTrace();
} catch (ClassNotFoundException cnfe)
{
cnfe.printStackTrace();
} catch (NoSuchMethodException e)
{
// TODO Auto-generated catch block
e.printStackTrace();
} catch (SecurityException e)
{
// TODO Auto-generated catch block
e.printStackTrace();
} catch (InstantiationException e)
{
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IllegalAccessException e)
{
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IllegalArgumentException e)
{
// TODO Auto-generated catch block
e.printStackTrace();
} catch (InvocationTargetException e)
{
// TODO Auto-generated catch block
e.printStackTrace();
}
}
It basically takes a message (request), maps it to a configured class and then that class performs whatever action needed.
On the client side, I have a class called RequestSender, which is used to send arbitrary requests to the server:
public class PCRequestSender
{
private static int getPort(int defaultPort)
{
final String port = PCConfigHandler.getStringProperty("serverPort");
if (null != port)
{
try
{
return Integer.parseInt(port);
} catch (NumberFormatException e)
{
System.out.println("Value of port property"
+ " is not a valid positive integer [" + port + "]."
+ " Reverting to default [" + defaultPort + "].");
}
}
return defaultPort;
}
public static PCBaseReply sendRequest(PCBaseRequest req)
{
PCBaseReply reply = null;
int port = getPort(8081);
String address = PCConfigHandler.getStringProperty("serverAddress");
try (Socket serverSocket = new Socket(address, port);
ObjectOutputStream out = new ObjectOutputStream(
serverSocket.getOutputStream());
ObjectInputStream in = new ObjectInputStream(
serverSocket.getInputStream());)
{
out.writeObject(req);
Object recObj = in.readObject();
reply = (PCBaseReply) recObj;
System.out.println("Reply: "+reply);
} catch (IOException e)
{
e.printStackTrace();
} catch (ClassNotFoundException e)
{
e.printStackTrace();
}
return reply;
}
}
Now I'm a bit at a loss, because I would also like to constantly listen to a server socket to catch notifications. Do I need another socket on the server side? Is my setup not tooooo ideal?
I'm helpful for any hints...thanks!

get user groups members using Google Directory API

I'm using the Google Directory API, here is the code that I'm using and I get the user info. But I need to get also the groups that the user is member.
My question is how can I do that when I have the user. I have another code to get the members, from a group but this impractical, because if I do that. I'll will need to get all the members for all the groups.
public static void get_user(String correo) {
Users us;
try {
service = getDirectoryService("admin#domain.mx");
try {
us = service.users().list().setCustomer("my_customer").setQuery("email:"+correo).execute();
System.out.println("us:"+us);
List<User> lu = us.getUsers();
System.out.println("lu:"+lu);
if (lu!=null) {
System.out.println("reses:"+lu.size());
for (int i=0;i<lu.size();i++) {
User u = lu.get(i);
String id = u.getId();
String pemail = u.getPrimaryEmail();
UserName username = u.getName();
System.out.println("xxxx.................");
System.out.println(i+":"+id);
System.out.println("username:"+username.getFullName());
System.out.println("full:"+username.getGivenName());
System.out.println("email:"+pemail);
System.out.println("organization unit:"+u.getOrgUnitPath());
}
}
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
} catch (GeneralSecurityException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
} catch (IOException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
} catch (URISyntaxException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
}
}

Can't list files when accessing FTP folder from Heroku app

I'm have created a java app that reads files from a FTP server.I have tested this app locally(with success) and now i have deployed this app to heroku.
This is a piece a my code :
public void CSVListing() {
String[] fnames = {"1","2","3","4"};
try {
try {
client.connect(host);
} catch (SocketException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
} catch (IOException ex) {
// TODO Auto-generated catch block
ex.printStackTrace();
}
//----------------------------------------
boolean login = false;
try {
login = client.login(user, pass);
} catch (IOException e2) {
// TODO Auto-generated catch block
e2.printStackTrace();
}
if (login) {
System.out.println("Login success...");
//boolean logout = false;
System.out.println("ready to work");
}
else {
System.out.println("Login fail...");
}
//----------------------------------------
System.out.println(client.printWorkingDirectory());
fnames = client.listNames();
System.out.println("FNAMES ARE" + fnames);
for(String s: fnames){
System.out.println(s);
}
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
......................................................
I have locally executed this code and it gives me a list of the files, but when I execute this on my heroku app online >>fnames = client.listNames();<< returns null according to my logs. I'm accessing the same FTP host in both executions (locally and online).
Can somebody help me and tell me where i'm wrong?

Did you check your permissions? Awhile ago I pass through something similar, the problem was that the user connecting to the FTP server didn't have permission to download files.

Why sendText calls throw timeout exception when using websockets?

I am new to websocket, and trying out with few examples. The application I created works fine for sometime say 10 - 15 mins, and from then on, it throws the timeout exception when sendText method is called on websocket session. I changed the value for "org.apache.tomcat.websocket.BLOCKING_SEND_TIMEOUT" to -1 and now it hangs.
could you please help me to resolve this issue.
The code I have written to send the data to websocket is as below:
public void update() {
Dashboard dashboardData = tunnelDataService.getDashboardData();
ObjectWriter ow = new ObjectMapper().writer();
String json = null;
try {
json = ow.writeValueAsString(dashboardData);
} catch (JsonGenerationException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
} catch (JsonMappingException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
} catch (IOException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
}
try {
synchronized (lock) {
if (session.isOpen()) {
session.getBasicRemote().sendText(json);
}
}
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
I am deploying this application on JBoss EAP 6.3.