Catch exceptions in the filter and convert it to Global Exception.
Then write response to user about error
It is a global exception handler mechanism which helps user to catch error in ANYWHERE including Controller, Service, Filters, even Spring exceptions are converted.
<dependency>
<groupId>com.tgf.exception</groupId>
<artifactId>handler</artifactId>
<version>1.0.0</version>
</dependency>
1- First add dependecy to your project. Also enable library with @EnableSingleException that helps to load other related configs.
2- Just select a exception which all exceptions will be converted by simply adding @SelectedException(exception = GlobalException.class)
@EnableSingleException
@SelectedException(exception = GlobalException.class)
@Configuration
public class Config {
}
3- After you enable it. You have to create a custom exception which must implements SingleException.
public class GlobalException extends RuntimeException implements SingleException {
private JsonNode errorResponse;
private String message = "";
@Override
public JsonNode getErrorResponse() {
return errorResponse;
}
@Override
public void setErrorResponse(JsonNode jsonNode) {
this.errorResponse = jsonNode;
}
public String getMessage() {
return message;
}
public void setMessage(String message) {
this.message = message;
}
}
4- Error response is unstructured data and depend on your implementation as well. Basic response is supported as below response.
{
"method": "GET",
"path": "/tgf/data",
"time": "2024-03-08T01:44:15.4385552",
"msg": "Request processing failed: com.to.go.fit.exception.GlobalException: Test",
"status": 500
}
5- If you create a bean which implements ResponseGenerator then you can customize your error response.
@Component
public class CustomGenerator implements ResponseGenerator {
@Override
public JsonNode apply(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, JsonNode jsonNode, String message) {
// you can return Array or object or whatever which will be converted to json.
}
}
- Spring context is necessary (Other than spring applications it will not work)
- Jackson is mandotary.
- You can check all dependencies in pom.xml which are provided only. You can simply remove provided from them.
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