ioexception

问题 I'm using a Pi 3 with google IOT to operate some relays that control valves on an irrigation system. The system uses the internet to get a weather forecast to work how much water to use, and uses NanoHTTPD to provide a UI. It's running nicely, but occasionally I get an error which stops the whole thing. From the log files: 05-04 05:26:14.677 737-1077/com.google.android.gms.persistent W/Conscrypt: Could not set socket write timeout: 05-04 05:26:14.678 737-1077/com.google.android.gms.persistent

问题 I can "fix" the below exception with a try-catch loop but I cannot understand the reason. Why does the part "in.readLine()" continuosly ignite IOExceptions? What is really the purpose of throwing such exceptions, the goal probably not just more side effects? Code and IOExceptions $ javac ReadLineTest.java ReadLineTest.java:9: unreported exception java.io.IOException; must be caught or declared to be thrown while((s=in.readLine())!=null){ ^ 1 error $ cat ReadLineTest.java import java.io.*;

问题 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

问题 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

问题 I'm pretty new to Hadoop. However, I've been able to successfully setup hadoop 2.7.3 with Java 7 in the cluster mode on my servers. Everything works totally fine. But then, when I try to switch to Java 8 and start dfs, there is an error: Exception in thread "main" java.io.IOException: failure to login at org.apache.hadoop.security.UserGroupInformation.loginUserFromSubject(UserGroupInformation.java:824) at org.apache.hadoop.security.UserGroupInformation.getLoginUser(UserGroupInformation.java

问题 I am running the following command to get my encrypted obb file for apk expansion. jobb -d /home/manoj/Desktop/Test -o main.1.com.example.helloworld.obb -k "manoj" -pn com.example.helloworld -pv 1 I am getting following exception. Please tell what went wrong. Slop: 0 Directory Overhead: 0 Slop: 1132 Directory Overhead: 768 Partial Sector [32] writing to sector: 15 Partial Sector [32] writing to sector: 15 Partial Sector [32] writing to sector: 15 Partial Sector [331] writing to sector: 223

问题 I get the following IOException : java.io.IOException: Access is denied at java.io.WinNTFileSystem.createFileExclusively(Native Method) at java.io.File.createNewFile(File.java:850) at zipUnzipper.main(zipUnzipper.java:41) When trying to run the following piece of code : public class zipUnzipper { public zipUnzipper() { } public static void main(String[] args){ //Unzip to temp folder. Add all files to mFiles. Print names of all files in mFfiles. File file = new File("C:\\aZipFile.zip"); String

问题 When I try to run my Job I am getting the following exception: Exception in thread "main" java.io.IOException: Mkdirs failed to create /some/path at org.apache.hadoop.util.RunJar.ensureDirectory(RunJar.java:106) at org.apache.hadoop.util.RunJar.main(RunJar.java:150) Where the /some/path is hadoop.tmp.dir. However when I issue the dfs -ls cmd on /some/path I can see that it exists and the dataset file is present (was copied before lunching the job). Also the path is correctly defined in hadoop

问题 I'm having a problem with my designer on a MVVM project. I have a TreeView with a custom DataTemplate : <DataTemplate> <StackPanel Orientation="Horizontal"> <Image Name="img" Width="20" Height="20" Stretch="Fill" Source="{Binding RelativeSource={RelativeSource Mode=FindAncestor, AncestorType={x:Type TreeViewItem}}, Path=Header, Converter={StaticResource HeaderToImageConverter}}" /> <TextBlock Text="{Binding}" Margin="5,0" /> </StackPanel> </DataTemplate> Resource declaration : <Window x:Class

问题 I have this servlet code in java: package servlets; import java.io.*; import java.util.*; import javax.servlet.*; import java.net.*; public class Servlet1 extends GenericServlet{ private ServletConfig sc; public void init(ServletConfig conf) throws ServletException{ super.init(conf); sc = conf; } public void read_file(){ String filename = "/web/WEB-INF/Data.txt"; BufferedReader br = new BufferedReader(new FileReader(filename)); // Why this doesn't work ? } public void service(ServletRequest