Getting "No message available" error with Spring Boot + REST application
Solution 1
You're probably missing @SpringBootApplication
:
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
@SpringBootApplication
public class Application {
public static void main(String[] args) throws Exception {
SpringApplication.run(Application.class, args);
}
}
@SpringBootApplication
includes @ComponentScan
which scans the package it's in and all children packages. Your controller may not be in any of them.
Solution 2
Three Possible Solutions:
1) Make sure the YourController.java file that has the @Controller and the YourSpringBootFile.java file that has the @SpringBootApplication are in the same package.
So you know what I'm talking about, here is my WebController.java file:
@RestController
public class WebController {
private static final String template = "Hello, %s!";
private final AtomicLong counter = new AtomicLong();
@RequestMapping(value= "/hi", method = RequestMethod.GET)
public @ResponseBody Greeting sayHello(
@RequestParam(value = "name", required = false, defaultValue = "Stranger") String name) {
System.out.println("Inside sayHello() of WebController.java");
return new Greeting(counter.incrementAndGet(), String.format(template, name));
}
}
Here is my JsonPostExampleProj1Application.java:
@SpringBootApplication
public class JsonPostExampleProj1Application {
public static void main(String[] args) {
SpringApplication.run(JsonPostExampleProj1Application.class, args);
}
}
2) If you want your controller to be in a different package outside of YourSpringBootFile.java's package, then follow these instructions = Spring: Run multiple "SpringApplication.Run()" in application main method
3) Try using @RestController instead of @Controller on top of your Controller class.
Solution 3
This can help someone as it was in my case.
Make sure the package name of the controller is the derived (or child) package of your Spring main method package.
For example:
If the main method package is com.company.demo.example
then the controller package should be like com.company.demo.example.controller
(if you specify something like com.company.demo.controller
it won't work!).
Solution 4
Apart from the anotatting the SpringBoot entry point with @SpringBootApplication((scanBasePackages = "com.duwamish.x.y")
so that it includes all the spring components/beans when initialized,
The contextPath also has to be right. If the application is deployed to tomcat with the application name as myapplication
see below,
$ ll /usr/local/apache-tomcat-8.0.42/webapps/
total 179216
12495017 drwxrwxrwx 17 urayagppd NORD\Domain Users 578 Mar 8 11:59 ROOT
12495019 drwxrwxrwx 55 urayagppd NORD\Domain Users 1870 Mar 8 11:59 docs
12495042 drwxrwxrwx 7 urayagppd NORD\Domain Users 238 Mar 8 11:59 examples
12495109 drwxrwxrwx 7 urayagppd NORD\Domain Users 238 Mar 8 11:59 host-manager
12495114 drwxrwxrwx 8 urayagppd NORD\Domain Users 272 Mar 8 11:59 manager
16169612 drwxr-xr-x 4 urayagppd NORD\Domain Users 136 May 7 18:47 myapplication
16169594 -rw-r--r-- 1 urayagppd NORD\Domain Users 45340041 May 7 18:47 myapplication.war
Then REST endpoint would be /myapplication/api/greetings
But if the application war is deployed as ROOT
, the endpoint resource will be /api/greetings
only.
Solution 5
If you are using @SpringBootApplication
alone, then make sure your rest service controller is in the same package like below -
com.testSpring->SpringBootApplication class com.testSpring.controller->RestfulController classes com.testSpring.model->Model classes ..etc
If you are using @ComponentScan(basePackageClasses = UserController.class)
, then mention specific controller class names.
Naveen
Updated on June 06, 2021Comments
-
Naveen almost 3 years
I have created demo Spring Boot project and implemented Restful services as shown here
@RestController public class GreetingsController { @RequestMapping(value="/api/greetings", method=RequestMethod.GET, produces=MediaType.APPLICATION_JSON_VALUE) public ResponseEntity<String> getGreetings(){ return new ResponseEntity<String>("Hello World", HttpStatus.OK); } }
When I tried to invoke the service with Postman tool with url "http://localhost:8080/api/greetings" as request method GET, I am getting below error message
{ "timestamp": 1449495844177, "status": 404, "error": "Not Found", "message": "No message available", "path": "/api/greetings" }
Per Spring Boot application, I don't have to configure the Spring Dispatcher servlet in web.xml.
Can someone help me to find out the missing point here?