added spring boot ControllerAdvice

recommendation/src/main/java/de/weinbrecht/luc/bpm/architecture/recommendation/adapter/in/web/RestExceptionHandlerAdvice.java

@@ -0,0 +1,20 @@
+package de.weinbrecht.luc.bpm.architecture.recommendation.adapter.in.web;
+
+import io.github.domainprimitives.validation.InvariantException;
+import org.springframework.http.HttpHeaders;
+import org.springframework.http.ResponseEntity;
+import org.springframework.web.bind.annotation.ControllerAdvice;
+import org.springframework.web.bind.annotation.ExceptionHandler;
+import org.springframework.web.context.request.WebRequest;
+import org.springframework.web.servlet.mvc.method.annotation.ResponseEntityExceptionHandler;
+
+import static org.springframework.http.HttpStatus.BAD_REQUEST;
+
+@ControllerAdvice
+public class RestExceptionHandlerAdvice extends ResponseEntityExceptionHandler {
+
+    @ExceptionHandler(value = InvariantException.class)
+    protected ResponseEntity<Object> handleInvariantConflict(InvariantException ex, WebRequest request) {
+        return handleExceptionInternal(ex, ex.getMessage(), new HttpHeaders(), BAD_REQUEST, request);
+    }
+}

recommendation/src/test/java/de/weinbrecht/luc/bpm/architecture/recommendation/adapter/in/web/DemoController.java

@@ -0,0 +1,18 @@
+package de.weinbrecht.luc.bpm.architecture.recommendation.adapter.in.web;
+
+import io.github.domainprimitives.validation.InvariantException;
+import lombok.RequiredArgsConstructor;
+import org.springframework.web.bind.annotation.GetMapping;
+import org.springframework.web.bind.annotation.RequestMapping;
+import org.springframework.web.bind.annotation.RestController;
+
+@RequiredArgsConstructor
+@RestController
+@RequestMapping("error")
+public class DemoController {
+
+    @GetMapping()
+    public void provideInvariant() {
+        throw new InvariantException("Foo", "Testing");
+    }
+}

recommendation/src/test/java/de/weinbrecht/luc/bpm/architecture/recommendation/adapter/in/web/RestExceptionHandlerAdviceTest.java

@@ -0,0 +1,22 @@
+package de.weinbrecht.luc.bpm.architecture.recommendation.adapter.in.web;
+
+import org.junit.jupiter.api.Test;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.boot.test.autoconfigure.web.servlet.WebMvcTest;
+import org.springframework.test.web.servlet.MockMvc;
+
+import static org.springframework.test.web.servlet.request.MockMvcRequestBuilders.get;
+import static org.springframework.test.web.servlet.result.MockMvcResultMatchers.status;
+
+
+@WebMvcTest(DemoController.class)
+class RestExceptionHandlerAdviceTest {
+
+    @Autowired
+    private MockMvc mockMvc;
+
+    @Test
+    void should_handle_invariants() throws Exception {
+        mockMvc.perform(get("/error")).andExpect(status().isBadRequest());
+    }
+}