Revert "NullPointerException in HopsworksHttpClient (logicalclocks#352)"

This reverts commit fb4dd2b.

Author: manu-sj

java/hsfs/src/main/java/com/logicalclocks/hsfs/metadata/HopsworksHttpClient.java

@@ -22,14 +22,12 @@
 import org.apache.http.HttpRequest;
 import org.apache.http.client.ResponseHandler;
 import org.slf4j.Logger;
-import org.slf4j.LoggerFactory;
 
 import java.io.File;
 import java.io.IOException;
-import java.nio.charset.Charset;
 
 public interface HopsworksHttpClient {
-  Logger LOGGER = LoggerFactory.getLogger(HopsworksHttpClient.class);
+  static final Logger LOGGER = null;
 
   <T> T handleRequest(HttpRequest request, ResponseHandler<T> responseHandler)
       throws IOException, FeatureStoreException;
@@ -48,7 +46,7 @@ <T> T handleRequest(HttpRequest request, ResponseHandler<T> responseHandler)
 
   static String readCertKey(String materialPwd) {
     try {
-      return FileUtils.readFileToString(new File(materialPwd), Charset.defaultCharset());
+      return FileUtils.readFileToString(new File(materialPwd));
     } catch (IOException ex) {
       LOGGER.warn("Failed to get cert password.", ex);
     }

java/hsfs/src/test/java/com/logicalclocks/hsfs/metadata/TestHopsworksClient.java

@@ -46,12 +46,4 @@ public void testStringEntitySerialization() throws IOException {
     Assertions.assertEquals("{\"email\":\"test@test.com\",\"firstName\":\"test\",\"lastName\":\"de la Rúa Martínez\"}",
         json);
   }
-
-  // FSTORE-1562: readCertKey throws NullPointerException if
-  @Test
-  public void testReadCertKey_failure() {
-    String key = HopsworksHttpClient.readCertKey("/this/path/does/not/exists");
-    Assertions.assertNull(key);
-  }
-
 }