SONAR-15388 - BBS Validation with missing response body

server/sonar-alm-client/src/main/java/org/sonar/alm/client/bitbucketserver/BitbucketServerRestClient.java

@@ -168,7 +168,7 @@ public class BitbucketServerRestClient {
 
   protected static String getErrorMessage(ResponseBody body) throws IOException {
     String bodyString = body.string();
-    if (equals(MediaType.parse("application/json;charset=utf-8"), body.contentType())) {
+    if (equals(MediaType.parse("application/json;charset=utf-8"), body.contentType()) && !isNullOrEmpty(bodyString)) {
       try {
         return Stream.of(buildGson().fromJson(bodyString, Errors.class).errorData)
           .map(e -> e.exceptionName + " " + e.message)

server/sonar-alm-client/src/test/java/org/sonar/alm/client/bitbucketserver/BitbucketServerRestClientTest.java

@@ -486,6 +486,17 @@ public class BitbucketServerRestClientTest {
       .extracting(e -> ((BitbucketServerException) e).getHttpStatus()).isEqualTo(404);
   }
 
+  @Test
+  public void fail_validate_url_when_body_is_empty() {
+    server.enqueue(new MockResponse().setResponseCode(404).setBody(""));
+
+    String serverUrl = server.url("/").toString();
+    assertThatThrownBy(() -> underTest.validateUrl(serverUrl))
+      .isInstanceOf(BitbucketServerException.class)
+      .hasMessage("")
+      .extracting(e -> ((BitbucketServerException) e).getHttpStatus()).isEqualTo(404);
+  }
+
   @Test
   public void fail_validate_url_when_validate_url_return_non_json_payload() {
     server.enqueue(new MockResponse().setResponseCode(400)