Java spring 控制器没有被映射
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Java spring controller is not being mapped
提问by CrazySabbath
I have a spring web application, which has few controllers. My problem is that while trying to redeploy .war to tomcat (or simply restarting application) controllers aren't being mapped from the first try. I have to redeploy app or restart again until they are finally mapped...I have no idea why this is happening.
我有一个 Spring Web 应用程序，它的控制器很少。我的问题是，在尝试将 .war 重新部署到 tomcat（或简单地重新启动应用程序）时，控制器并未从第一次尝试开始映射。我必须重新部署应用程序或重新启动，直到它们最终被映射......我不知道为什么会发生这种情况。
One of my controllers:
我的控制器之一：
@RestController
@RequestMapping("kt")
public class KTIntegrationController {
@Autowired
KtImportService importService;
@ExceptionHandler(ItemNotFoundException.class)
@ResponseStatus(value= HttpStatus.NOT_FOUND)
public RestError handleNotFoundException(ItemNotFoundException e) {
return new RestError(404, "NOT FOUND", e.getMessage());
}
@RequestMapping(value="import/to-db", method=RequestMethod.POST)
public RestResponse<List<String>> loadToDB(@RequestParam("initiator") String initiator,
@RequestParam("process") String pid,
@RequestParam("category") String institution) throws KtImportException {
return new RestResponse<List<String>>(importService.loadToDB(initiator,pid,institution));
}
}
Tomcat log (when controller was not mapped):
Tomcat 日志（未映射控制器时）：
...
...
[12:47:40.887] INFO o.s.w.s.m.m.a.RequestMappingHandlerAdapter - Looking for @ControllerAdvice: org.springframework.boot.context.embedded.AnnotationConfigEmbeddedWebApplicationContext@bf5b3f: startup date [Thu Aug 27 12:47:23 EEST 2015]; root of context hierarchy
[12:47:41.107] INFO o.s.w.s.m.m.a.RequestMappingHandlerMapping - Mapped "{[/error],methods=[],params=[],headers=[],consumes=[],produces=[],custom=[]}" onto public org.springframework.http.ResponseEntity<java.util.Map<java.lang.String, java.lang.Object>> org.springframework.boot.autoconfigure.web.BasicErrorController.error(javax.servlet.http.HttpServletRequest)
[12:47:41.108] INFO o.s.w.s.m.m.a.RequestMappingHandlerMapping - Mapped "{[/error],methods=[],params=[],headers=[],consumes=[],produces=[text/html],custom=[]}" onto public org.springframework.web.servlet.ModelAndView org.springframework.boot.autoconfigure.web.BasicErrorController.errorHtml(javax.servlet.http.HttpServletRequest)
[12:47:41.173] INFO o.s.w.s.h.SimpleUrlHandlerMapping - Mapped URL path [/webjars/**] onto handler of type [class org.springframework.web.servlet.resource.ResourceHttpRequestHandler]
[12:47:41.173] INFO o.s.w.s.h.SimpleUrlHandlerMapping - Mapped URL path [/**] onto handler of type [class org.springframework.web.servlet.resource.ResourceHttpRequestHandler]
[12:47:41.291] INFO o.s.w.s.h.SimpleUrlHandlerMapping - Mapped URL path [/**/favicon.ico] onto handler of type [class org.springframework.web.servlet.resource.ResourceHttpRequestHandler]
[12:47:41.895] INFO o.s.j.e.a.AnnotationMBeanExporter - Registering beans for JMX exposure on startup
[12:47:41.922] INFO o.s.boot.SpringApplication - Started application in 19.463 seconds (JVM running for 547.311)
...
...
Tomcat log (when controller was mapped):
Tomcat 日志（映射控制器时）：
...
...
[11:27:39.426] INFO o.s.w.s.m.m.a.RequestMappingHandlerAdapter - Looking for @ControllerAdvice: org.springframework.boot.context.embedded.AnnotationConfigEmbeddedWebApplicationContext@1722a662: startup date [Thu Aug 27 11:27:28 EEST 2015]; root of context hierarchy
[11:27:39.577] INFO o.s.w.s.m.m.a.RequestMappingHandlerMapping - Mapped "{[/kt/import/to-db],methods=[POST],params=[],headers=[],consumes=[],produces=[],custom=[]}" onto public com.gerasolutions.rest.RestResponse<java.util.List<java.lang.String>> com.gera.integration.rc.rest.controller.KTIntegrationController.loadToDB(java.lang.String,java.lang.String,java.lang.String) throws com.gera.integration.rc.core.domain.KtImportException
...
...
[11:27:39.586] INFO o.s.w.s.m.m.a.RequestMappingHandlerMapping - Mapped "{[/error],methods=[],params=[],headers=[],consumes=[],produces=[],custom=[]}" onto public org.springframework.http.ResponseEntity<java.util.Map<java.lang.String, java.lang.Object>> org.springframework.boot.autoconfigure.web.BasicErrorController.error(javax.servlet.http.HttpServletRequest)
[11:27:39.586] INFO o.s.w.s.m.m.a.RequestMappingHandlerMapping - Mapped "{[/error],methods=[],params=[],headers=[],consumes=[],produces=[text/html],custom=[]}" onto public org.springframework.web.servlet.ModelAndView org.springframework.boot.autoconfigure.web.BasicErrorController.errorHtml(javax.servlet.http.HttpServletRequest)
[11:27:39.634] INFO o.s.w.s.h.SimpleUrlHandlerMapping - Mapped URL path [/webjars/**] onto handler of type [class org.springframework.web.servlet.resource.ResourceHttpRequestHandler]
[11:27:39.635] INFO o.s.w.s.h.SimpleUrlHandlerMapping - Mapped URL path [/**] onto handler of type [class org.springframework.web.servlet.resource.ResourceHttpRequestHandler]
[11:27:39.706] INFO o.s.w.s.h.SimpleUrlHandlerMapping - Mapped URL path [/**/favicon.ico] onto handler of type [class org.springframework.web.servlet.resource.ResourceHttpRequestHandler]
[11:27:40.009] INFO o.s.j.e.a.AnnotationMBeanExporter - Registering beans for JMX exposure on startup
[11:27:40.022] INFO o.s.boot.SpringApplication - Started application in 12.283 seconds (JVM running for 19.89)
...
...
I don't expect to find answer how to fix this here, since this is a pretty confusing bug (well, at least for me), but some ideas or pointers where I could start looking would be most helpeful.
我不希望在这里找到如何解决这个问题的答案，因为这是一个非常令人困惑的错误（好吧，至少对我来说），但是我可以开始寻找的一些想法或指示将是最有帮助的。
--EDIT--
- 编辑 -
Project structure:
项目结构：
app
-> src
-> main
-> java
-> com.app.a
-> c
-> config
-> Config.class
-> r
-> controller
-> Controller.class
Application.class
ServletInitialiazer.class
-> resources
-> webapp (this is empty)
Application.class:
应用程序类：
@Configuration
@ComponentScan(basePackages={"com.app.a.*"})
@EnableAutoConfiguration
public class Application {
public static void main(String[] args) {
SpringApplication.run(Application.class, args);
}
}
ServletInitializer.class:
ServletInitializer.class:
public class ServletInitializer extends SpringBootServletInitializer {
@Override
protected SpringApplicationBuilder configure(SpringApplicationBuilder application) {
return application.sources(Application.class);
}
}
Config.class has datasource and other beans defined in it. (shouldn't affect this bug)
Config.class 中定义了数据源和其他 bean。（应该不会影响这个bug）
--EDIT--
- 编辑 -
What's more, if I simply boot this application .war from my laptop, using command line: mvn spring-boot:run, everything works, controllers are always being mapped from the first try.
更重要的是，如果我只是从我的笔记本电脑启动这个应用程序 .war，使用命令行：mvn spring-boot:run，一切正常，控制器总是从第一次尝试开始映射。
采纳答案by CrazySabbath
Solution to the problem:
问题的解决方法：
My spring web application is using few java projects (included jars through maven) that I wrote. Problem was, that included jars, which are used like typical java libraries, where in fact spring-boot projects. Removing spring-boot from java projects, that were using spring-boot, solved this issue.
我的spring web应用程序使用了我编写的几个java项目（包括通过maven的jar）。问题是，这包括 jars，它像典型的 java 库一样使用，实际上是 spring-boot 项目。从使用 spring-boot 的 java 项目中删除 spring-boot 解决了这个问题。
回答by fillup
One thing which I've found to work in the past with these type of errors is to change the granularity of the package scanning:
我发现过去可以解决这些类型的错误的一件事是更改包扫描的粒度：
e.g.
例如
@ComponentScan(basePackages={"com.app"})
I know it's bizarre but it's worked for me in the past. I've no idea why this happens though.
我知道这很奇怪，但它过去对我有用。我不知道为什么会发生这种情况。
