#SpringBoot: HandleInterceptor preHandle throw Exception in html format

Question

I am trying to put interceptor to handle my custom authentication logic. So my prehandler will throw an exception if person in not logged in . I have my ErrorHandler controller added in script[/error] which gives json formatted error.

But when prehandler throws an exception it's all in html format, can i redirect my request to /error controller or if possible give my response in json format.

Script

public class AuthenticationInterceptor extends HandlerInterceptorAdapter {

@Override
public boolean preHandle(HttpServletRequest request,
                         HttpServletResponse response, Object handler) throws Exception {

    throw new Exception("HELLO");
}

}

Current Output

<title>Apache Tomcat/8.5.11 - Error report</title>

HTTP Status 500 - Request processing failed; nested exception is java.lang.Exception: HELLO

Expected Output

{"timestamp":1496584878547,"status":500,"error":"Found","message":"Hello"}

Did you find any solution by yourself already? I have the same issue. — BigJ
– BigJ, Commented Sep 19, 2018 at 14:34

silentsudo · Accepted Answer · 2022-11-10 07:27:05Z

As per this discussion we cannot directly use controller advice with handlers. Here is how i have achieved it.

Create json string for error message
Use HttpServletResponse to write this error message to downstream

Ex.

@Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws IOException {
        final String tenantId = request.getHeader(X_TENANT_ID);
        if (ObjectUtils.isEmpty(tenantId)) {
            return returnErrorResponse(response);
        } else {
            Assert.notNull(tenantId, tenantExceptionMessage);
            TenantIdContext.setTenantIdContext(tenantId);
            return true;
        }
    }

Error message implementation

private boolean returnErrorResponse(HttpServletResponse response) throws IOException {
        final int httpErrorCode = HttpServletResponse.SC_BAD_REQUEST;
        response.setStatus(httpErrorCode);
        response.setContentType(MediaType.APPLICATION_JSON_VALUE);
        response.setCharacterEncoding("UTF-8");
        final String jsonMessage = objectMapper.writeValueAsString(new TenantIdMissing(tenantExceptionMessage.get(), httpErrorCode));
        System.out.println(jsonMessage);
        response.getWriter().write(jsonMessage);
        return false;
    }

Object mapper as instance variable for lazy devs to create json string.

private final ObjectMapper objectMapper = new ObjectMapper();

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#SpringBoot: HandleInterceptor preHandle throw Exception in html format

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HTTP Status 500 - Request processing failed; nested exception is java.lang.Exception: HELLO

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