java-8

问题 I am trying to validate Jaxb objects against an xsd by marshalling them. This was working fine in weblogic11 but after migration to weblogic12c it isn't working. For example, even if the mandatory tags are missing, there is no error and xml is being formed successfully! I noticed event.getLinkedException() is returning null. ValidateXml.java import java.io.File; import java.io.StringWriter; import java.util.ArrayList; import java.util.HashMap; import java.util.List; import java.util.Map;

问题 I am trying to unmarshall XML String payload using JAXB in jdk1.8.0_162, while trying to get JAXBContext.newInstance, I am getting javax.xml.bind.JAXBException - with linked exception:[java.lang.ClassNotFoundException: oracle.xml.jaxb.JaxbContextImpl], any input would be great! I have tried adding following dependencies in my pom.xml based on different suggestions from various stackoverflow forums, nothing seems to work : <groupId>javax.xml.bind</groupId> <artifactId>jaxb-api</artifactId>

问题 I am trying to unmarshall XML String payload using JAXB in jdk1.8.0_162, while trying to get JAXBContext.newInstance, I am getting javax.xml.bind.JAXBException - with linked exception:[java.lang.ClassNotFoundException: oracle.xml.jaxb.JaxbContextImpl], any input would be great! I have tried adding following dependencies in my pom.xml based on different suggestions from various stackoverflow forums, nothing seems to work : <groupId>javax.xml.bind</groupId> <artifactId>jaxb-api</artifactId>

问题 I have a list of Student Objects as below. Student1 DOB : 12/02/2010 Student2 DOB : 12/03/2010 Student1 DOB : 12/04/2010 Student4 DOB : Student2 DOB : Student3 DOB : 12/01/2010 Student{ String name; Date dob; } I want to group the Students based on the DOB as below. All Students should be grouped based on the student name. Students must be in descending order of dob. Same Students grouped together should be in descending order of dob. Remaining Student objects must be in same order as it is

问题 I have a list of Student Objects as below. Student1 DOB : 12/02/2010 Student2 DOB : 12/03/2010 Student1 DOB : 12/04/2010 Student4 DOB : Student2 DOB : Student3 DOB : 12/01/2010 Student{ String name; Date dob; } I want to group the Students based on the DOB as below. All Students should be grouped based on the student name. Students must be in descending order of dob. Same Students grouped together should be in descending order of dob. Remaining Student objects must be in same order as it is

问题 My understanding of the Swing Event Dispatcher Thread (EDT) is that its a dedicated thread where event handling code is executed. So, if my understanding is correct, then in the example below: private class ButtonClickListener implements ActionListener{ public void actionPerformed(ActionEvent e) { // START EDT String command = e.getActionCommand(); if( command.equals( "OK" )) { statusLabel.setText("Ok Button clicked."); } else if( command.equals( "Submit" ) ) { statusLabel.setText("Submit

问题 After spending the day of learning about the java Concurrency API, I still dont quite get how could I create the following functionality with the help of CompletableFuture and ExecutorService classes: When I get a request on my REST endpoint I need to: Start an asynchronous task (includes DB query, filtering, etc.), which will give me a list of String URLs at the end In the meanwhile, responde back to the REST caller with HTTP OK, that the request was received, I'm working on it When the

问题 I'm having some trouble understanding streams. I've looked around and can't seem to find an example that matches my use case. I have an existing nested for loop: List<ObjectB> objectBs = new ArrayList<ObjectB>(); for (ObjectA objA: objectAList) { for (ObjectB objB: objA.getObjectBList()) { if (objB.getNumber() != 2) { objectBs.add(objB); } } } Alot of exampls show how to add objB.getNumber() to a list but not objB . 回答1: You can use flatMap to obtain a Stream<ObjectB> of all the ObjectB

问题 @FunctionalInterface public interface Runnable { public abstract void run(); } public class MethodReference1 { public static String ThreadStatus() { System.out.println( Thread.currentThread().getName() + " is running..."); return "threadname"; } public static void main(String[] args) { Thread t1 = new Thread(() -> ThreadStatus()); t1.start(); } } In the above example using Java 8, ThreadStatus() returns a string but Runnable interface "run()" method doesnt return any value. But it still works

问题 I need to count Elements in a Stream and assign it to an Integer without casting. .count() does return long thought about the .collect(Collectors.reducing(..)) but cant figure it out. I feel like there is something simple I don't get. My Try: Stream<String> s = Stream.of("Hallo ", "Test", "String"); Integer count = s.filter(e -> (e.length() >= lb && e.length() <= ub && !e.contains(" "))) .map(e -> e.toUpperCase()) .distinct() .collect(Collectors.reducing(0, e -> 1, Integer::sum))); System.out