java

问题 I am new to Java custom annotations I am developing a custom annotation which encrypt and decrypt a string and store it in database using spring and mongodb and for encryption I am using jasypt. I am not getting the exact procedure to do so. My code. Entity public class Demo { @Id private Long id; private String somethingPublic; @EncryptDemo() private String somethingPrivate; //getter setter } custom annotation @Target({ ElementType.METHOD, ElementType.FIELD }) @Retention(RetentionPolicy

问题 I have a head scratcher here and I do not know how to handle this. I have several test classes that run via xml. Around 90 test classes, each with about 10+ @Test steps inside them. I have a selenium grid configued, with a maxSession=5 so no more than 5 parallel browser instances can run parallel on a single node. Heres the part I do NOT understand. Lets say I kick off this xml file with all of these test classes, I set my thread-count=10 hoping that 10 tests will kick off at a time. What

问题 I've a problem using XStream in Spring context. The method c.t.x.XStream.addImplicitCollection(Class ownerType, String fieldName, String itemFieldName, Class itemType) doesn't work correctly if we import the xstream dependency in pom but it does work if we import xstream source code and we esclude related dependency in pom. We used the following dependencies' version: xstream : 1.4.11.1 spring-boot-dependencies : 2.1.2.RELEASE Testing fromXml with the xstream's dependency in the pom.xml we

问题 I'd like to know if it's possible to navigate through Vaadin grid or treegrid and select an item using only keyboard arrow keys? From what i've seen while testing the components, the default behavior seems to be either to move only to one specific cell in grid or to a specific row in treegrid. Selection can be achieved if the user presses spacebar. I've tried to add a shortcutListener to grid but it doesn't seem to work with arrow keys. And the grid scrollbar doesn't move with the selected

问题 I'm using Java Spring 3.0.4 (can't upgrade due to some requirements) and I need to enable Cors in order for my front-end to talk to my back-end. My back-end is an angular application running on: http://localhost:4200/home I have tried the following with no luck: public static final String CREDENTIALS_NAME = "Access-Control-Allow-Credentials"; public static final String ORIGIN_NAME = "Access-Control-Allow-Origin"; public static final String METHODS_NAME = "Access-Control-Allow-Methods"; public

问题 I have the following code: public class Tester { public static void main(String[] args) { HashMap<Integer,String> map = new HashMap<Integer,String>(); map.put(1, "one"); map.put(2, "twp"); map.put(2, "two2"); int highest = Integer.MIN_VALUE; String highestString = null; int secondHighest = Integer.MIN_VALUE; String secondHighestString = null; if (highest == Integer.MIN_VALUE){ highest = Collections.max(map.keySet() ); highestString = map.get(highest); map.remove(highest); } if (secondHighest

问题 I have the following code: public class Tester { public static void main(String[] args) { HashMap<Integer,String> map = new HashMap<Integer,String>(); map.put(1, "one"); map.put(2, "twp"); map.put(2, "two2"); int highest = Integer.MIN_VALUE; String highestString = null; int secondHighest = Integer.MIN_VALUE; String secondHighestString = null; if (highest == Integer.MIN_VALUE){ highest = Collections.max(map.keySet() ); highestString = map.get(highest); map.remove(highest); } if (secondHighest

问题 I want to store an object from my class in file, and after that to be able to load the object from this file. But somewhere I am making a mistake(s) and cannot figure out where. May I receive some help? public class GameManagerSystem implements GameManager, Serializable { private static final long serialVersionUID = -5966618586666474164L; HashMap<Game, GameStatus> games; HashMap<Ticket, ArrayList<Object>> baggage; HashSet<Ticket> bookedTickets; Place place; public GameManagerSystem(Place

问题 I am trying to create a 2d array of String using Streams: String[] fruit1DArray; String[][] fruit2DArray; Map<String, String> fruitMap = new HashMap<>(); fruitMap.put("apple", "red"); fruitMap.put("pear", "green"); fruitMap.put("orange", "orange"); fruit1DArray = fruitMap.entrySet() .stream() .map(key -> key.getKey()) .toArray(size -> new String[size]); fruit2DArray = fruitMap.entrySet() .stream() .map(entry-> new String[]{entry.getKey()}) .toArray(size -> new String[size][1]); System.out

问题 I am trying to create a 2d array of String using Streams: String[] fruit1DArray; String[][] fruit2DArray; Map<String, String> fruitMap = new HashMap<>(); fruitMap.put("apple", "red"); fruitMap.put("pear", "green"); fruitMap.put("orange", "orange"); fruit1DArray = fruitMap.entrySet() .stream() .map(key -> key.getKey()) .toArray(size -> new String[size]); fruit2DArray = fruitMap.entrySet() .stream() .map(entry-> new String[]{entry.getKey()}) .toArray(size -> new String[size][1]); System.out