ioexception

I am experiencing a problem with this code: public class gravityv1 { public static double[] calculategravity(double[] mass, int[] diameter) { double[] gravity = new double[mass.length]; for (int n = 0; n < mass.length; n++) { gravity[n] = (6.67E-11 * mass[n]) / Math.pow((diameter[n] / 2), 2); } return gravity; } public static void print(double[] gravity, double[] mass, int[] diameter, String[] planet) { System.out.println(" Planetary Data"); System.out.println("Planet Diameter(km) Mass(kg) g(m/s^2)"); System.out.println("---------------------------------------------------------------------");

I have a following class: public class SessionStore { Subject<Session, Session> subject; public SessionStore() { subject = new SerializedSubject<>(BehaviorSubject.create(new Session()); } public void set(Session session) { subject.onNext(session); } public Observable<UserSession> observe() { return subject.distinctUntilChanged(); } } In activity I observe the session and perform network operation on each change: private Subscription init() { return sessionStore .observe() .flatMap(new Func1<Session, Observable<Object>>() { @Override public Observable<Object> call(Session session) { return

So I've been battling this issue for about a week now and think I know the issue but I don't want to report an answer there until I have it pegged down. In a nutshell, I get an IOException when trying to use the SerialPort.Open() command. As it turns out, this is very common and most terminal programs actually do as well, but they simply ignore it. Please read my post above for the full tale. Now what I want to do is ignore the IOException but still open the serial port . I cannot do this with try/catch, or at least I don't know how. I was wondering is there a way to try something and somehow

I'm writing a java file-transfer app, and i have some troubles with deserialisation myself-defined class Message from Datagramms. Other topics at StackOverflow has similar issues, but i didn't found something helpful from there, so i'm sorry in advance if i missed it. so, class Message is: import java.io.Serializable; public class Message implements Serializable { private static final long serialVersionUID = 1L; private int segmentID; private byte[] packet; private int bytesToWrite; public Message(){ segmentID = -1; } public Message(int segmentID, byte[] packet, int bytesToWrite) { this

I converted native lportal DB from Hypersonic to PostgreSQL. Added portal-ext.properties files with my PostgreSQL configurations and added postgresql-42.1.1 to D:\files\liferay-ce-portal-7.0-ga3\tomcat-8.0.32\lib\ext # PostgreSQL # jdbc.default.driverClassName=org.postgresql.Driver jdbc.default.url=jdbc:postgresql://localhost:5432/test jdbc.default.username=postgres jdbc.default.password=root And when I'm starting my liferay it shows me an Exception. But If I remove portal-ext.properties it will work fine! What the problem?? 08:36:35,748 ERROR [Framework Event Dispatcher: Equinox Container:

This question already has an answer here: How to handle infinite loop caused by invalid input (InputMismatchException) using Scanner 5 answers In my program I'm trying to get a user to input an int between 1-3 and then do something based off what they type. If it is not a number or not one of the options then it will allow them to reenter a valid option. The issue I have is I'm having trouble brainstorming how to not have it infinitely loop and just allow them to enter in a number after the console tells them they entered an invalid input. int i = 0; while (i < 1) { try { int level = scan

Many people asked question like that but this one is a little bit different. Here is the code: public static BufferedReader reader; public static String readString() throws IOException { reader = new BufferedReader(new InputStreamReader(System.in)); String s = reader.readLine(); reader.close(); return s; } While program runtime readString method is invoked many times. The second call causes exception: stream closed . I can not understand: why it ends up so? Every time we declare new BufferedReader . So the stream must be also new. Or not? If not, how should I organize my program so that it

I've got a communication system based on TcpClient, and it works great except for when it's doing HTTPS to a particular IP. Then it starts to fail. By using a browser or HttpWebRequest, I have no problems doing HTTPS to that IP. I've created a test program to narrow my problem down to its basic essence, you can have a look at it here if you want: TestViaTcp That test program works perfectly for basic HTTP to the same IP, it always produces a successful response to the request. I put it in a loop, trigger it with a keypress, it will continue to succeed all day long. As soon as I toggle the