java

问题 I'm getting below issue while accessing ApplicationMaster UI from the RM WebUI (hadoop 2.6.0). There is no standalone WebProxy server running. The Proxy is running as a part of ResourceManager. "HTTP ERROR 500 Problem accessing /proxy/application_1431357703844_0004/. Reason: Connection refused" Log entries in resourcemanager logs: 2015-05-11 19:25:01,837 INFO webproxy.WebAppProxyServlet (WebAppProxyServlet.java:doGet(330)) - ubuntu is accessing unchecked http://slave1:51704/ which is the app

问题 I'm getting below issue while accessing ApplicationMaster UI from the RM WebUI (hadoop 2.6.0). There is no standalone WebProxy server running. The Proxy is running as a part of ResourceManager. "HTTP ERROR 500 Problem accessing /proxy/application_1431357703844_0004/. Reason: Connection refused" Log entries in resourcemanager logs: 2015-05-11 19:25:01,837 INFO webproxy.WebAppProxyServlet (WebAppProxyServlet.java:doGet(330)) - ubuntu is accessing unchecked http://slave1:51704/ which is the app

问题 I've been trying to use the Android Documentation to determine how to start an activity with putExtra. My putExtra value is of type String and I've tried numerous combinations of "true", "1", putting the string in quotes. I've tried switching the flags to "-n", "-a", etc... Can somebody point out what I'm doing wrong here? I've ready many other articles but they are usually for some built in intent. I'm starting my own custom intent. Starting an intent with a string key. -e|--es <EXTRA_KEY>

问题 First time using JavaFX, I'm trying to test it with an Hello World! window. I'm using Java 8 (update 211) with Eclipse on a MacOS with Mojave 10.14.5. I'm working on this project: I put all the JavaFX jar I think I need into the build path (maybe I'm missing some jars?). I'm trying to open a window with JavaFX using this code: import javafx.application.Application; import javafx.event.ActionEvent; import javafx.event.EventHandler; import javafx.scene.Scene; import javafx.scene.control.Button;

问题 First time using JavaFX, I'm trying to test it with an Hello World! window. I'm using Java 8 (update 211) with Eclipse on a MacOS with Mojave 10.14.5. I'm working on this project: I put all the JavaFX jar I think I need into the build path (maybe I'm missing some jars?). I'm trying to open a window with JavaFX using this code: import javafx.application.Application; import javafx.event.ActionEvent; import javafx.event.EventHandler; import javafx.scene.Scene; import javafx.scene.control.Button;

问题 I have a Java project that I'm making which has had several commits on github. I recently changed OS versions on Kubuntu from 17.10 -> 18.04, and have installed Netbeans 8.2 with Java Version 1.8.0_171 to avoid Java 9+ compatibility issues. I can't clone the project from git, every time I try to import it using the built in Git "Team" support, my cridentials bounce back. This is mysterious since I use KeePassX to manage all my ID information and directly copy-paste it. I've verified that this

问题 I understand that it is illegal in Java to cast a List<Number> to a List<Double> , since List<Double> is not a subtype of List<Number> : List<Number> list1 = new ArrayList<>(); List<Double> list2 = (List<Double>) list1; // inconvertible types With this understanding I would expect that it is also illegal to cast a List<? extends List<Number>> to a List<List<Double>> , since I would think that List<Double> does not belong to the family of types given by List<Number> . However, this cast is

问题 How can I show a tree inside a JComboBox popup? Here is example tree: Theoretical computer science Mathematical logic Automata theory Algorithms and data structures Analysis of algorithms Algorithms 回答1: There is no default way to put a tree in a combo box. There are a couple of options: If you can give allowing expansion of nodes, you can achieve a similar effect by adding space before some of the options in a standard JComobBox. Or even space and a dash in front of leaf options. If you need

问题 So ... I'm looking for a hash function that -- assuming no input skew -- will distribute nonempty Strings of (up to) 16 bytes "reasonably uniformly" onto a range [0..n] where n is user input but does not change over time. And I should be able to argue why the function should provide that "resonably uniform" distribution. In the end, all I need is a Java implementation of the hash function for use in a server and a reason "why" this hash function is suitable. So I'm looking less for "perfect

问题 So ... I'm looking for a hash function that -- assuming no input skew -- will distribute nonempty Strings of (up to) 16 bytes "reasonably uniformly" onto a range [0..n] where n is user input but does not change over time. And I should be able to argue why the function should provide that "resonably uniform" distribution. In the end, all I need is a Java implementation of the hash function for use in a server and a reason "why" this hash function is suitable. So I'm looking less for "perfect