Java
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Java – although there are no errors in the log, the email sent on Google App Engine is invalid
[I looked at all the questions related to this topic on so, but none of them seemed to explain the behavior I saw] I h…… -
Java – JUnit tests the hypothesis of theoretical failure
I'm implementing a JUnit test (version 4.11) that will run several times with different parameters So I use the JUnit …… -
Java – the calculator does not handle two operator equations
I am developing a calculator application and all functions have been turned off The only problem is that when I enter …… -
Java – how to conduct transactions in the service layer
There is a Dao layer in my project This is my usersdao interface, which implements usersdaoimpl public interface Users…… -
Java – Android HTTP request with client certificate
I'm trying to use this code to make a request to a server with client certificate authentication: try { /*** CA Ce…… -
Get the input and output quantity of MapReduce in Java
I want to get the number of inputs and outputs of the map phase and the reduce phase and time of completing the map / …… -
Multithreading – if there were more threads, would my program get more CPU time?
If the current kernel is scheduling 60 threads, they belong to 3 processes: They are all doing calculations (no disk I…… -
Java – user registration page not verified
<?PHP <?PHP $name = $_POST["name"]; $age = $_POST["age"]; $email = $_POST["email"]; …… -
Java – spring MVC – unable to compile classes for JSP
I'm following the spring MVC course of virtualpairprogrammers. There seems to be some problems with the workspace they…… -
Java – parsing tables with jsoup
I'm trying to use jsoup to extract email addresses and phone numbers from the LinkedIn configuration file, each in a t…… -
Java thread performance on raspberry pi
The goal of the application is to process 800 concurrent clients through TCP, and each client sends a 3.5kb XML. XML p…… -
Java – do string parameters usually escape automatically in Web services?
Today, I found that a simple% of the string parameters passed from the client to the server can lead to an incorrect r…… -
Java – the interest calculator does not display results
I try to finish this at the last minute of my java class. When I run the program and ask whether the user information …… -
Java – spring starts security, and oauth2 logs off to invalidate the session, so as to complete the authentication and approval cycle in the authorization server
I've been following Dave syer tutorial, SSO and oauth2, Part 5 https://github.com/spring-guides/tut-spring-security-an…… -
Java – format spring error message parameters
I have a spring boot web application, and I reject the value in the controller, as follows: @RequestMapping(value = "/…… -
Java – Import Hadoop source code into IntelliJ
Does anyone know what to do? I read import Maven dependencies in IntelliJ idea But it doesn't work thank you Solution …… -
Java – unable to handle the business interface of EJB classes
When starting Maven with test parameters, I got the exception mentioned above When creating an integration test deploy…… -
Java / parse error Trying to send from Android SDK to parse
This was set for another application a few days ago and works normally. The result was successfully sent to mongolab A…… -
How to find an unknown duplicate substring in a string or table Coulmn
I have a large string of numbers as input to the program (I think the sequence name is's'). It can be a string or a ta…… -
Java – without a print statement, the loop cannot see the value changed by other threads
In my code, I have a loop waiting to change a state from a different thread Another thread works, but my loop will nev…… -
Java – missing application resources
Write Spark Program in Java. The code is as follows: import org.apache.spark.SparkConf; import org.apache.spark.api.ja…… -
Using sockets in Java to communicate with multiple clients
Suppose I have 100 clients in my office I must create an application in which a running main thread is waiting for any…… -
Java – Android: how to build dates from server dates
I have the following code to convert the date string returned by the server into a self - string /** * Change date for…… -
Java – hibernate does not automatically update the @ elementcollection
According to the book, I update a list of elementcollection, I don't do transition Begin, hibernate will submit automa…… -
Why is Java’s exchange Slot cache line fill like this?
When I read the 'false sharing' mechanism in Java, I was in Java util. concurrent. Exchanger. The following code is fo…… -
Java – after GC applications run slowly
I have an application (game) running on the JVM The game's update logic (run 60 times / second) is complete, about 25%…… -
Java – how to stop and start executing a for loop
I'm creating a framework for our project, Before method (use JXL to read the first line) @BeforeMethod public void Tes…… -
How to convert date to hexadecimal in Java
I am not familiar with Java. I need to get the current datetime and express it as a string, for example: #1:1357902468…… -
Java – unable to resolve host ”; There is no address associated with the host name
Reading RSS links in my android app, I received this error: In my simulator, I can connect to Google. Com through a br…… -
Java – JWT login process and token validation on the server
What is the correct way to verify tokens on the server? I use the JWT token mechanism in my application, which is how …… -
Java – extends existing ant path Tags
Can existing path markers in ant build files be extended? For example, I want to expand: <path id="project.classpat…… -
Java – the typed method in the jparepository does not return the correct type
I have a method in the jparepository that should return a list of JPA entities: @Entity public class SomeEntity { ……