java

问题 I have always wondered why I need a Properties class as I can always create a HashMap and keep the key/value pairs there. May be it reduces the amount of code to write to load/store properties file. Because otherwise we have to create BufferedReader and read files and split the String and all these. But if we are going to get our key / value pairs from sources other than file then probably it doesn't make any difference whether we are using Properties class or HashMap class. I just need

问题 This question already has answers here : Why does Spring MVC respond with a 404 and report “No mapping found for HTTP request with URI […] in DispatcherServlet”? (11 answers) Closed 4 years ago . Morning, I already checked most of the answers to this problem (No mapping found for HTTP request with URI.... in DispatcherServlet with name) and also (No mapping found for HTTP request with URI [/ChickenTest/index] in DispatcherServlet with name 'dispatcherServlet') but I'm still getting "No

问题 I have always wondered why I need a Properties class as I can always create a HashMap and keep the key/value pairs there. May be it reduces the amount of code to write to load/store properties file. Because otherwise we have to create BufferedReader and read files and split the String and all these. But if we are going to get our key / value pairs from sources other than file then probably it doesn't make any difference whether we are using Properties class or HashMap class. I just need

问题 I have 3 classes, Account , CappedAccount , UserAccount , CappedAccount , and UserAccount both extend Account . Account contains the following: abstract class Account { ... /** * Attempts to add money to account. */ public void add(double amount) { balance += amount; } } CappedAccount overrides this behavior: public class CappedAccount extends Account { ... @Override public void add(double amount) { if (balance + amount > cap) { // New Precondition return; } balance += amount; } } UserAccount

问题 Is there a way to integrate spring RestTemplate with JavaBean validation api. ? I know there is a integration for spring controller. you can put @Valid on request body param and if Employee is not valid you will get MethodArgumentNotValidException exception . which you can handel in exception handler class. @PostMapping(value = "/add", produces = APPLICATION_JSON_VALUE) public ResponseEntity<String> addEmployee( @RequestBody @Valid Employee emp) { //... } But what I want is similar way to

问题 I’m using Wildfly 9.0.0.CR2. How do I enable on-the-fly compilation of JSPs? I found this configuration in another thread <subsystem xmlns="urn:jboss:domain:web:1.4" default-virtual-server="default-host" native="false"> <configuration> <jsp-configuration development="true" check-interval="1" modification-test-interval="1" recompile-on-fail="true"/> </configuration> </subsystem> but alas, it doesn’t work, result in gin the below exception when I restart my JBoss server … 14:23:05,224 ERROR

问题 I’m using Wildfly 9.0.0.CR2. How do I enable on-the-fly compilation of JSPs? I found this configuration in another thread <subsystem xmlns="urn:jboss:domain:web:1.4" default-virtual-server="default-host" native="false"> <configuration> <jsp-configuration development="true" check-interval="1" modification-test-interval="1" recompile-on-fail="true"/> </configuration> </subsystem> but alas, it doesn’t work, result in gin the below exception when I restart my JBoss server … 14:23:05,224 ERROR

问题 This question already has answers here : Java LocalDate Formatting of 2000-1-2 error [duplicate] (2 answers) Closed 2 years ago . DateTimeFormatter is not giving correct format for Dec 30 and 31 2018 as per following snippet. final String DATE_FORMAT = "YYYYMM"; DateTimeFormatter dateFormat = DateTimeFormatter.ofPattern(DATE_FORMAT); LocalDateTime startDate = LocalDateTime.of(2018,12,29,5,0,0); System.out.println(startDate.format(dateFormat)); //prints 201812 LocalDateTime startDate =

问题 This is probably a rudimentary question but I am still kinda new to programming and I've wondered for awhile. I've done multiple projects in Python, C#, and Java, and when I try to use new libraries (especially for Python) people always say to make sure its in the right PATH and such. I just followed an online tutorial on how to install Java on a new computer and it rekindled my question of what a path really is. Is the Path just were the programming language looks for a library in the file

问题 This is probably a rudimentary question but I am still kinda new to programming and I've wondered for awhile. I've done multiple projects in Python, C#, and Java, and when I try to use new libraries (especially for Python) people always say to make sure its in the right PATH and such. I just followed an online tutorial on how to install Java on a new computer and it rekindled my question of what a path really is. Is the Path just were the programming language looks for a library in the file