[OLINGO-936] fix sonar issues

lib/server-core/src/main/java/org/apache/olingo/server/core/debug/ServerCoreDebugger.java

@@ -20,6 +20,7 @@ package org.apache.olingo.server.core.debug;
 
 import java.io.ByteArrayInputStream;
 import java.io.InputStream;
+import java.nio.charset.Charset;
 import java.util.ArrayList;
 import java.util.List;
 import java.util.Map;
@@ -39,6 +40,7 @@ import org.apache.olingo.server.api.uri.UriInfo;
 
 public class ServerCoreDebugger {
 
+  private static final Charset DEFAULT_ENCODING = Charset.forName("UTF-8");
   private final List<RuntimeMeasurement> runtimeInformation = new ArrayList<RuntimeMeasurement>();
   private final OData odata;
 
@@ -82,7 +84,8 @@ public class ServerCoreDebugger {
     ODataResponse odResponse = new ODataResponse();
     odResponse.setStatusCode(HttpStatusCode.INTERNAL_SERVER_ERROR.getStatusCode());
     odResponse.setHeader(HttpHeader.CONTENT_TYPE, ContentType.TEXT_PLAIN.toContentTypeString());
-    InputStream content = new ByteArrayInputStream("ODataLibrary: Could not assemble debug response.".getBytes());
+    InputStream content = new ByteArrayInputStream("ODataLibrary: Could not assemble debug response."
+        .getBytes(DEFAULT_ENCODING));
     odResponse.setContent(content);
     return odResponse;
   }

lib/server-core/src/main/java/org/apache/olingo/server/core/deserializer/batch/BatchParser.java

@@ -49,12 +49,6 @@ public class BatchParser {
       return parseBatch(in, boundary, transformator);
     } catch (IOException e) {
       throw new ODataRuntimeException(e);
-    } finally {
-      try {
-        in.close();
-      } catch (IOException e) {
-        throw new ODataRuntimeException(e);
-      }
     }
   }
 

lib/server-core/src/main/java/org/apache/olingo/server/core/deserializer/batch/Header.java

@@ -26,7 +26,7 @@ import java.util.Locale;
 import java.util.Map;
 
 public class Header implements Iterable<HeaderField>, Cloneable {
-  private final Map<String, HeaderField> headers = new HashMap<String, HeaderField>();
+  private Map<String, HeaderField> headers = new HashMap<String, HeaderField>();
   private int lineNumber;
 
   public Header(final int lineNumer) {
@@ -111,7 +111,6 @@ public class Header implements Iterable<HeaderField>, Cloneable {
 
   private HeaderField getHeaderFieldOrDefault(final String name, final int lineNumber) {
     HeaderField headerField = headers.get(name.toLowerCase(Locale.ENGLISH));
-
     if (headerField == null) {
       headerField = new HeaderField(name, lineNumber);
       headers.put(name.toLowerCase(Locale.ENGLISH), headerField);
@@ -121,14 +120,15 @@ public class Header implements Iterable<HeaderField>, Cloneable {
   }
 
   @Override
-  public Header clone() {
+  public Header clone() throws CloneNotSupportedException{
-    final Header newInstance = new Header(lineNumber);
+    Header clone = (Header) super.clone();
-
+    clone.lineNumber = lineNumber;
+    clone.headers = new HashMap<String, HeaderField>();
     for (final Map.Entry<String, HeaderField> entries : headers.entrySet()) {
-      newInstance.headers.put(entries.getKey(), entries.getValue().clone());
+      clone.headers.put(entries.getKey(), entries.getValue().clone());
     }
 
-    return newInstance;
+    return clone;
   }
 
   @Override

lib/server-core/src/main/java/org/apache/olingo/server/core/deserializer/batch/HeaderField.java

@@ -23,8 +23,8 @@ import java.util.List;
 
 public class HeaderField implements Cloneable {
   private final String fieldName;
-  private final List<String> values;
   private final int lineNumber;
+  private List<String> values;
 
   public HeaderField(final String fieldName, final int lineNumber) {
     this(fieldName, new ArrayList<String>(), lineNumber);
@@ -60,11 +60,11 @@ public class HeaderField implements Cloneable {
   }
 
   @Override
-  public HeaderField clone() {
+  public HeaderField clone() throws CloneNotSupportedException{
-    List<String> newValues = new ArrayList<String>(values.size());
+    HeaderField clone = (HeaderField) super.clone();
-    newValues.addAll(values);
+    clone.values = new ArrayList<String>(values.size());
-
+    clone.values.addAll(values);
-    return new HeaderField(fieldName, newValues, lineNumber);
+    return clone;
   }
 
   public int getLineNumber() {

lib/server-core/src/main/java/org/apache/olingo/server/core/serializer/BatchResponseSerializer.java

@@ -234,11 +234,11 @@ public class BatchResponseSerializer {
       content = getBody(response);
     }
 
-    public int getLength() {
+    private int getLength() {
       return content.length;
     }
 
-    public byte[] getContent() {
+    private byte[] getContent() {
       return content;
     }
 

lib/server-core/src/test/java/org/apache/olingo/server/core/deserializer/batch/HeaderTest.java

@@ -22,6 +22,7 @@ import static org.junit.Assert.assertEquals;
 import static org.junit.Assert.assertNull;
 import static org.junit.Assert.assertTrue;
 
+import java.util.ArrayList;
 import java.util.Arrays;
 import java.util.List;
 
@@ -86,7 +87,7 @@ public class HeaderTest {
   }
 
   @Test
-  public void deepCopy() {
+  public void deepCopy() throws Exception {
     Header header = new Header(1);
     header.addHeader(HttpHeader.CONTENT_TYPE, ContentType.MULTIPART_MIXED + ";boundary=123", 1);
 
@@ -99,6 +100,21 @@ public class HeaderTest {
     assertTrue(header.getHeaderField(HttpHeader.CONTENT_TYPE) != copy.getHeaderField(HttpHeader.CONTENT_TYPE));
   }
 
+  @Test
+  public void deepCopyHeaderField() throws Exception {
+    List<String> values = new ArrayList<String>();
+    values.add("abc");
+    values.add("def");
+    HeaderField field = new HeaderField("name", values, 17);
+
+    HeaderField clone = field.clone();
+    assertEquals(field.getFieldName(), clone.getFieldName());
+    assertEquals(field.getLineNumber(), clone.getLineNumber());
+    assertEquals(field.getValues(), clone.getValues());
+
+    assertTrue(field.getValues() != clone.getValues());
+  }
+
   @Test
   public void duplicatedAddList() {
     Header header = new Header(1);