Fail service creation when Transifex credentials are invalid

src/main/java/org/genesys2/transifex/client/TransifexException.java

+/**
+ * Copyright 2014 Global Crop Diversity Trust
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ **/
+
+package org.genesys2.transifex.client;
+
+
+public class TransifexException extends Exception {
+
+	public TransifexException(String message, Throwable e) {
+		super(message, e);
+	}
+
+}

src/main/java/org/genesys2/transifex/client/TransifexServiceImpl.java

@@ -74,6 +74,24 @@ public class TransifexServiceImpl implements TransifexService, InitializingBean
 	public void afterPropertiesSet() throws Exception {
 		transifexProjectUrl = TRANSIFEX_API_URL.concat("/project/").concat(projectSlug);
 		LOG.info("Transifex project URL: " + transifexProjectUrl);
+		ensureTransifexCredentials();
+	}
+
+	private void ensureTransifexCredentials() throws TransifexException {
+		HttpHeaders headers = basicAuthentication();
+		HttpEntity<String> request = new HttpEntity<>(headers);
+		try {
+			ResponseEntity<String> response = template.exchange(transifexProjectUrl + "/?details", HttpMethod.GET, request, String.class);
+
+			// response.getBody() // contains JSON information about the project
+
+			if (LOG.isInfoEnabled()) {
+				LOG.info("Transifex connection okay! HTTP status code=" + response.getStatusCode());
+			}
+		} catch (HttpClientErrorException e) {
+			// Fail here to stop initializing the context!
+			throw new TransifexException("Transifex credentials are not valid.", e);
+		}
 	}
 
 	// Transifex requires Basic HTTP authentication!
@@ -200,9 +218,9 @@ public class TransifexServiceImpl implements TransifexService, InitializingBean
 
 		// Create Multi value map with all necessary information for request
 		MultiValueMap<String, Object> map = new LinkedMultiValueMap<>();
-//		map.add("slug", slug);
-//		map.add("name", title);
-//		map.add("i18n_type", "XHTML");
+		// map.add("slug", slug);
+		// map.add("name", title);
+		// map.add("i18n_type", "XHTML");
 
 		File tempFile = File.createTempFile(slug, ".xhtml");
 		// default FileWriter support default encoding only
@@ -221,7 +239,7 @@ public class TransifexServiceImpl implements TransifexService, InitializingBean
 
 			// Send our post request(with .xhtml file) to Transifex
 			template.put(transifexProjectUrl + "/resource/{slug}/content/", request, slug);
-			
+
 		} catch (HttpClientErrorException e) {
 			LOG.error(e.getMessage());
 			LOG.error(e.getResponseBodyAsString());