function description: when tomcat starts, a thread is started at the same time. Currently, there is no problem with thread startup, but a null pointer exception is caused due to the inability to inject javabean,. The javabean to be injected is encaps...
TbUser user = restTemplate.getForObject("http: moviemodel user {id}",TbUser.class,id); TbUser user = restTemplate.getForObject("http: localhost:8010 user {id}",TbUser.class,id); the first of these two methods is n...
idnullrequiredtrue : even if you try to get the id value using HttpServletRequest, you can t get the print result as null . ...
recently set up a ssm project of my own. I used to use @ Autowired to try @ Resource this time. However, injection always fails when using resource, no error is reported at startup, and null pointer exception is reported at run time. error java.lang...
I can t find the class in the core package after import and compilation. What should I do? ...
public JsonResult add(@Valid Person person, BindingResult bindingResult) { bindingResult.getAllErrors() :;; } ...
what is the weaving of AOP and what does it mean? ask God to answer what "weaving " means in popular words ...
Why store it after the server generates Token ? from the official documents of JWT, we know that, JSON WEB TOKEN consists of three parts: Header Payload Signature here we only talk about the saved content in Payload , quoted from the JWT o...
for example, is there only a proxy object and no target object in an IOC container such as service bean annotated with @ Transactional? ...
it is said that springmvc is thread-safe. I know that stateless objects must be thread-safe. But when Service is injected into Controller, it becomes a stateful object . Is it still thread-safe? public class UserController { } public cla...
now there is database An on a server, in which there is a table aa, that needs to back up the data in this table aa to database B of server b, and the name of the table should be changed from bb, database to mysql, framework to springmvc, data source Dru...
if neither name, nor type, is specified, it is automatically assembled in byName mode; if there is no match, it falls back to an original type for matching, and if there is a match, it is automatically assembled; I would like to ask what the @ Resourc...
RT, I want to run a test, but I always report this error. What s the problem? org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name com.repository.ProductCategoryRepositoryTest : Unsatisfied dependency expr...
the same query, using mongoTemplate will be much slower, using mongodb tool, looking at the execution plan is very fast, the difference is very big ...
public class ScanRegisterBean implements Serializable{ @Min(value = 1) @Max(value = Long.MAX_VALUE) private long id; @NotBlank(groups = {ScanRegister.class, Register.class}) @Length(min = 2, max = 20,groups = {ScanRegister.class, Re...
how to implement distributed websock push in a cluster environment? Ws s session cannot be persisted, so it can only be used as a stand-alone in map. Is there any elegant solution besides nginx s ip_hash? ...
backend code: ,reponseheader,ResponseEntiry; : ; , a.txt,::aaaa: "YWFhYQ== " springrequestMappingHandler: : ask for advice, how to solve it? do you want to change the configuration of handlermapping? I have tried to use ByteArrayHttpMessageConve...
Spring mvc two components: HandlerMapping and HandlerAdapter; HandlerMapping can already help us match the specific controller (Controller)? then why do you need HandlerAdapter?? ...
@Pointcut("execution(public * com.hellobj.tool.data.megersch.controller.Result.*(..))") public void webLog(){} @Before("webLog()") public void doBefore(JoinPoint joinPoint) throws Throwable { LOGGER.info(&quo...
** * * @return list * public List<UserResponseVO> listConditionsAggregations() { TermsAggregationBuilder builder = AggregationBuilders.terms("interests").field("interests"); SearchQuery query = new NativeSearchQuery...
what does the code circled in the following picture mean? ...
I am the version of Ubuntu18. The process of installing php7.1, through source code is as follows: 1. Extract the installation package php-7.1.18.tar.gz 2. Configure installation variables (to be simpler, mainly " usr local php " is the installatio...
the same code modification is delayed to run three times, and the result is different. question 1: as a result of the first two times, according to the JS event polling mechanism, the timer should be triggered after the console.log. Why does the value ...
! [picture upload.] the environmental background of the problems and what methods you have tried related codes Please paste the code text below (do not replace the code with pictures) what result do you expect? What is the error message act...
< el-form class= "from-1 " ref= "form ": model= "form ": rules= "rules " label-width= "80px " style= "width:100%; height: 380px; " > <el-form class="from_n1" style="width:940px; margin:auto;"> <div id=&q...