diff --git a/src/main/org/apache/tools/ant/RuntimeConfigurable.java b/src/main/org/apache/tools/ant/RuntimeConfigurable.java
index 26f68dfee..0aafccbe2 100644
--- a/src/main/org/apache/tools/ant/RuntimeConfigurable.java
+++ b/src/main/org/apache/tools/ant/RuntimeConfigurable.java
@@ -52,7 +52,8 @@ public class RuntimeConfigurable implements Serializable {
     private String elementTag = null;
 
     /** List of child element wrappers. */
-    private List<RuntimeConfigurable> children = null;
+    // picking ArrayList rather than List as arrayList is Serializable
+    private ArrayList<RuntimeConfigurable> children = null;
 
     /** The element to configure. It is only used during
      * maybeConfigure.
@@ -589,7 +590,7 @@ public class RuntimeConfigurable implements Serializable {
 
         // Children (this is a shadow of UnknownElement#children)
         if (r.children != null) {
-            List<RuntimeConfigurable> newChildren = new ArrayList<RuntimeConfigurable>();
+            ArrayList<RuntimeConfigurable> newChildren = new ArrayList<RuntimeConfigurable>();
             newChildren.addAll(r.children);
             if (children != null) {
                 newChildren.addAll(children);
diff --git a/src/main/org/apache/tools/ant/filters/SortFilter.java b/src/main/org/apache/tools/ant/filters/SortFilter.java
index 471660c3b..44e8d72ed 100644
--- a/src/main/org/apache/tools/ant/filters/SortFilter.java
+++ b/src/main/org/apache/tools/ant/filters/SortFilter.java
@@ -362,7 +362,7 @@ public final class SortFilter extends BaseParamFilterReader
             if (reverse) {
                 Collections.sort(lines, new Comparator<String>() {
                         public int compare(String s1, String s2) {
-                            return (-s1.compareTo(s2));
+                            return (-s1.compareTo(s2)); //NOSONAR
                         }
                     });
             } else {
diff --git a/src/main/org/apache/tools/ant/taskdefs/AntStructure.java b/src/main/org/apache/tools/ant/taskdefs/AntStructure.java
index 707f4b9c0..8554a2a3a 100644
--- a/src/main/org/apache/tools/ant/taskdefs/AntStructure.java
+++ b/src/main/org/apache/tools/ant/taskdefs/AntStructure.java
@@ -390,8 +390,7 @@ public class AntStructure extends Task {
                     } catch (final IllegalAccessException ie) {
                         sb.append("CDATA ");
                     }
-                } else if (type.getSuperclass() != null
-                           && type.getSuperclass().getName().equals("java.lang.Enum")) {
+                } else if (Enum.class.isAssignableFrom(type)) {
                     try {
                         final Object[] values = (Object[]) type.getMethod("values", (Class[])  null)
                             .invoke(null, (Object[]) null);
diff --git a/src/main/org/apache/tools/ant/taskdefs/ExecuteJava.java b/src/main/org/apache/tools/ant/taskdefs/ExecuteJava.java
index b78b9a6a5..b36f2fe66 100644
--- a/src/main/org/apache/tools/ant/taskdefs/ExecuteJava.java
+++ b/src/main/org/apache/tools/ant/taskdefs/ExecuteJava.java
@@ -53,6 +53,7 @@ public class ExecuteJava implements Runnable, TimeoutObserver {
     private Long timeout = null;
     private volatile Throwable caught = null;
     private volatile boolean timedOut = false;
+    private boolean done = false;
     private Thread thread = null;
 
     /**
@@ -150,7 +151,7 @@ public class ExecuteJava implements Runnable, TimeoutObserver {
                     + " is not declared static");
             }
             if (timeout == null) {
-                run();
+                run(); //NOSONAR
             } else {
                 thread = new Thread(this, "ExecuteJava");
                 Task currentThreadTask
@@ -168,7 +169,9 @@ public class ExecuteJava implements Runnable, TimeoutObserver {
                     thread.start();
                     w.start();
                     try {
-                        wait();
+                        while (!done) {
+                            wait();
+                        }
                     } catch (InterruptedException e) {
                         // ignore
                     }
@@ -228,6 +231,7 @@ public class ExecuteJava implements Runnable, TimeoutObserver {
                 perm.restoreSecurityManager();
             }
             synchronized (this) {
+                done = true;
                 notifyAll();
             }
         }
@@ -243,6 +247,7 @@ public class ExecuteJava implements Runnable, TimeoutObserver {
             timedOut = true;
             thread.interrupt();
         }
+        done = true;
         notifyAll();
     }
 
diff --git a/src/main/org/apache/tools/ant/taskdefs/Manifest.java b/src/main/org/apache/tools/ant/taskdefs/Manifest.java
index 06c74ddc7..0d7c05e61 100644
--- a/src/main/org/apache/tools/ant/taskdefs/Manifest.java
+++ b/src/main/org/apache/tools/ant/taskdefs/Manifest.java
@@ -1066,7 +1066,7 @@ public class Manifest {
         try {
             write(new PrintWriter(sw));
         } catch (IOException e) {
-            return null;
+            return "";
         }
         return sw.toString();
     }
diff --git a/src/main/org/apache/tools/ant/taskdefs/Parallel.java b/src/main/org/apache/tools/ant/taskdefs/Parallel.java
index c4f5c9e94..469ba418e 100644
--- a/src/main/org/apache/tools/ant/taskdefs/Parallel.java
+++ b/src/main/org/apache/tools/ant/taskdefs/Parallel.java
@@ -312,7 +312,13 @@ public class Parallel extends Task
                 Thread timeoutThread = new Thread() {
                     public synchronized void run() {
                         try {
-                            wait(timeout);
+                            final long start = System.currentTimeMillis();
+                            final long end = start + timeout;
+                            long now = System.currentTimeMillis();
+                            while (now < end) {
+                                wait(end - now);
+                                now = System.currentTimeMillis();
+                            }
                             synchronized (semaphore) {
                                 stillRunning = false;
                                 timedOut = true;
@@ -352,7 +358,7 @@ public class Parallel extends Task
                             // System.out.println("Thread " + i + " is still
                             // alive ");
                             // still running - wait for it
-                            semaphore.wait();
+                            semaphore.wait(); //NOSONAR
                             continue outer2;
                         }
                     }
diff --git a/src/main/org/apache/tools/ant/taskdefs/cvslib/ChangeLogParser.java b/src/main/org/apache/tools/ant/taskdefs/cvslib/ChangeLogParser.java
index 0096aadfe..b08810769 100644
--- a/src/main/org/apache/tools/ant/taskdefs/cvslib/ChangeLogParser.java
+++ b/src/main/org/apache/tools/ant/taskdefs/cvslib/ChangeLogParser.java
@@ -44,21 +44,16 @@ class ChangeLogParser {
     private static final int GET_REVISION = 4;
     private static final int GET_PREVIOUS_REV = 5;
 
-// FIXME formatters are not thread-safe
-
     /** input format for dates read in from cvs log */
-    private static final SimpleDateFormat INPUT_DATE
+    private final SimpleDateFormat inputDate
         = new SimpleDateFormat("yyyy/MM/dd HH:mm:ss", Locale.US);
     /**
      * New formatter used to parse CVS date/timestamp.
      */
-    private static final SimpleDateFormat CVS1129_INPUT_DATE =
+    private final SimpleDateFormat cvs1129InputDate =
         new SimpleDateFormat("yyyy-MM-dd HH:mm:ss Z", Locale.US);
 
     static {
-        TimeZone utc = TimeZone.getTimeZone("UTC");
-        INPUT_DATE.setTimeZone(utc);
-        CVS1129_INPUT_DATE.setTimeZone(utc);
     }
 
     //The following is data used while processing stdout of CVS command
@@ -102,6 +97,10 @@ class ChangeLogParser {
         for (int i = 0; i < moduleNames.length; i++) {
             moduleNameLengths[i] = moduleNames[i].length();
         }
+
+        TimeZone utc = TimeZone.getTimeZone("UTC");
+        inputDate.setTimeZone(utc);
+        cvs1129InputDate.setTimeZone(utc);
     }
 
     /**
@@ -297,10 +296,10 @@ class ChangeLogParser {
      */
     private Date parseDate(final String date) {
         try {
-            return INPUT_DATE.parse(date);
+            return inputDate.parse(date);
         } catch (ParseException e) {
             try {
-                return CVS1129_INPUT_DATE.parse(date);
+                return cvs1129InputDate.parse(date);
             } catch (ParseException e2) {
                 throw new IllegalStateException("Invalid date format: " + date);
             }
diff --git a/src/main/org/apache/tools/ant/taskdefs/cvslib/ChangeLogWriter.java b/src/main/org/apache/tools/ant/taskdefs/cvslib/ChangeLogWriter.java
index 2385e51ff..7e43f3aaf 100644
--- a/src/main/org/apache/tools/ant/taskdefs/cvslib/ChangeLogWriter.java
+++ b/src/main/org/apache/tools/ant/taskdefs/cvslib/ChangeLogWriter.java
@@ -34,18 +34,18 @@ import org.w3c.dom.Element;
  */
 public class ChangeLogWriter {
     /** output format for dates written to xml file */
-    private static final SimpleDateFormat OUTPUT_DATE
+    private final SimpleDateFormat outputDate
         = new SimpleDateFormat("yyyy-MM-dd");
     /** output format for times written to xml file */
-    private static final SimpleDateFormat OUTPUT_TIME
+    private static SimpleDateFormat outputTime
         = new SimpleDateFormat("HH:mm");
     /** stateless helper for writing the XML document */
     private static final DOMElementWriter DOM_WRITER = new DOMElementWriter();
 
-    static {
+    public ChangeLogWriter() {
         TimeZone utc = TimeZone.getTimeZone("UTC");
-        OUTPUT_DATE.setTimeZone(utc);
-        OUTPUT_TIME.setTimeZone(utc);
+        outputDate.setTimeZone(utc);
+        outputTime.setTimeZone(utc);
     }
 
     /**
@@ -87,9 +87,9 @@ public class ChangeLogWriter {
                             final CVSEntry entry) throws IOException {
         Element ent = doc.createElement("entry");
         DOMUtils.appendTextElement(ent, "date",
-                                   OUTPUT_DATE.format(entry.getDate()));
+                                   outputDate.format(entry.getDate()));
         DOMUtils.appendTextElement(ent, "time",
-                                   OUTPUT_TIME.format(entry.getDate()));
+                                   outputTime.format(entry.getDate()));
         DOMUtils.appendCDATAElement(ent, "author", entry.getAuthor());
 
         final Enumeration enumeration = entry.getFiles().elements();
diff --git a/src/main/org/apache/tools/ant/taskdefs/optional/EchoProperties.java b/src/main/org/apache/tools/ant/taskdefs/optional/EchoProperties.java
index d8ef51a2f..30bcc759c 100644
--- a/src/main/org/apache/tools/ant/taskdefs/optional/EchoProperties.java
+++ b/src/main/org/apache/tools/ant/taskdefs/optional/EchoProperties.java
@@ -440,6 +440,24 @@ public class EchoProperties extends Task {
             Tuple that = (Tuple) o;
             return key.compareTo(that.key);
         }
+
+        @Override
+        public boolean equals(Object o) {
+            if (o == this) {
+                return true;
+            }
+            if (o == null || o.getClass() != getClass()) {
+                return false;
+            }
+            Tuple that = (Tuple) o;
+            return (key == null ? that.key == null : key.equals(that.key))
+                && (value == null ? that.value == null : value.equals(that.value));
+        }
+
+        @Override
+        public int hashCode() {
+            return key != null ? key.hashCode() : 0;
+        }
     }
 
     private List sortProperties(Properties props) {
diff --git a/src/main/org/apache/tools/ant/taskdefs/optional/TraXLiaison.java b/src/main/org/apache/tools/ant/taskdefs/optional/TraXLiaison.java
index 859f0be2d..85dd311b8 100644
--- a/src/main/org/apache/tools/ant/taskdefs/optional/TraXLiaison.java
+++ b/src/main/org/apache/tools/ant/taskdefs/optional/TraXLiaison.java
@@ -335,7 +335,7 @@ public class TraXLiaison implements XSLTLiaison4, ErrorListener, XSLTLoggerAware
         }
 
         if (traceConfiguration != null) {
-            if ("org.apache.xalan.transformer.TransformerImpl"
+            if ("org.apache.xalan.transformer.TransformerImpl" //NOSONAR
                 .equals(transformer.getClass().getName())) {
                 try {
                     final Class traceSupport =
diff --git a/src/main/org/apache/tools/ant/taskdefs/rmic/KaffeRmic.java b/src/main/org/apache/tools/ant/taskdefs/rmic/KaffeRmic.java
index 2108a68b9..ff72ad406 100644
--- a/src/main/org/apache/tools/ant/taskdefs/rmic/KaffeRmic.java
+++ b/src/main/org/apache/tools/ant/taskdefs/rmic/KaffeRmic.java
@@ -67,7 +67,7 @@ public class KaffeRmic extends DefaultRmicAdapter {
         }
 
         cmd.setExecutable(c.getName());
-        if (!c.getName().equals(RMIC_CLASSNAMES[RMIC_CLASSNAMES.length - 1])) {
+        if (!c.getName().equals(RMIC_CLASSNAMES[RMIC_CLASSNAMES.length - 1])) { //NOSONAR
             // only supported since Kaffe 1.1.2
             cmd.createArgument().setValue("-verbose");
             getRmic().log(Commandline.describeCommand(cmd));
diff --git a/src/main/org/apache/tools/ant/types/AntFilterReader.java b/src/main/org/apache/tools/ant/types/AntFilterReader.java
index 20c41bc70..bdc1c316f 100644
--- a/src/main/org/apache/tools/ant/types/AntFilterReader.java
+++ b/src/main/org/apache/tools/ant/types/AntFilterReader.java
@@ -27,8 +27,7 @@ import org.apache.tools.ant.Project;
  * An AntFilterReader is a wrapper class that encloses the classname
  * and configuration of a Configurable FilterReader.
  */
-public final class AntFilterReader
-    extends DataType implements Cloneable {
+public final class AntFilterReader extends DataType {
 
     private String className;
 
diff --git a/src/main/org/apache/tools/ant/types/FilterChain.java b/src/main/org/apache/tools/ant/types/FilterChain.java
index b495a5a32..da7d96716 100644
--- a/src/main/org/apache/tools/ant/types/FilterChain.java
+++ b/src/main/org/apache/tools/ant/types/FilterChain.java
@@ -45,8 +45,7 @@ import org.apache.tools.ant.filters.TokenFilter;
  * FilterChain may contain a chained set of filter readers.
  *
  */
-public class FilterChain extends DataType
-    implements Cloneable {
+public class FilterChain extends DataType {
 
     private Vector<Object> filterReaders = new Vector<Object>();
 
diff --git a/src/main/org/apache/tools/ant/types/Mapper.java b/src/main/org/apache/tools/ant/types/Mapper.java
index 941e8dd8c..c02e78207 100644
--- a/src/main/org/apache/tools/ant/types/Mapper.java
+++ b/src/main/org/apache/tools/ant/types/Mapper.java
@@ -30,7 +30,7 @@ import org.apache.tools.ant.util.FileNameMapper;
  * Element to define a FileNameMapper.
  *
  */
-public class Mapper extends DataType implements Cloneable {
+public class Mapper extends DataType {
     // CheckStyle:VisibilityModifier OFF - bc
 
     protected MapperType type = null;
diff --git a/src/main/org/apache/tools/ant/types/Permissions.java b/src/main/org/apache/tools/ant/types/Permissions.java
index 96da71bd0..d0559c75d 100644
--- a/src/main/org/apache/tools/ant/types/Permissions.java
+++ b/src/main/org/apache/tools/ant/types/Permissions.java
@@ -302,7 +302,7 @@ public class Permissions {
          * @param perm The permission to check against.
          */
         boolean matches(final java.security.Permission perm) {
-            if (!className.equals(perm.getClass().getName())) {
+            if (!className.equals(perm.getClass().getName())) { //NOSONAR
                 return false;
             }
             if (name != null) {
diff --git a/src/main/org/apache/tools/ant/types/XMLCatalog.java b/src/main/org/apache/tools/ant/types/XMLCatalog.java
index bd9be4312..2edd5a136 100644
--- a/src/main/org/apache/tools/ant/types/XMLCatalog.java
+++ b/src/main/org/apache/tools/ant/types/XMLCatalog.java
@@ -119,7 +119,7 @@ import org.xml.sax.XMLReader;
  *
  */
 public class XMLCatalog extends DataType
-    implements Cloneable, EntityResolver, URIResolver {
+    implements EntityResolver, URIResolver {
 
     /** helper for some File.toURL connversions */
     private static final FileUtils FILE_UTILS = FileUtils.getFileUtils();
diff --git a/src/main/org/apache/tools/ant/types/resources/ArchiveResource.java b/src/main/org/apache/tools/ant/types/resources/ArchiveResource.java
index 308de03e0..09ce03224 100644
--- a/src/main/org/apache/tools/ant/types/resources/ArchiveResource.java
+++ b/src/main/org/apache/tools/ant/types/resources/ArchiveResource.java
@@ -216,7 +216,7 @@ public abstract class ArchiveResource extends Resource {
         if (isReference()) {
             return getCheckedRef().equals(another);
         }
-        if (another == null || !(another.getClass().equals(getClass()))) {
+        if (another == null || another.getClass() != getClass()) {
             return false;
         }
         ArchiveResource r = (ArchiveResource) another;
diff --git a/src/main/org/apache/tools/ant/types/resources/MappedResource.java b/src/main/org/apache/tools/ant/types/resources/MappedResource.java
index 339c88bf9..c18cbf488 100644
--- a/src/main/org/apache/tools/ant/types/resources/MappedResource.java
+++ b/src/main/org/apache/tools/ant/types/resources/MappedResource.java
@@ -95,7 +95,7 @@ public class MappedResource extends ResourceDecorator {
      */
     @Override
     public boolean equals(Object other) {
-        if (other == null || !other.getClass().equals(getClass())) {
+        if (other == null || other.getClass() != getClass()) {
             return false;
         }
         MappedResource m = (MappedResource) other;
diff --git a/src/main/org/apache/tools/ant/types/resources/ResourceDecorator.java b/src/main/org/apache/tools/ant/types/resources/ResourceDecorator.java
index 3806cf2ca..9eb8c1d84 100644
--- a/src/main/org/apache/tools/ant/types/resources/ResourceDecorator.java
+++ b/src/main/org/apache/tools/ant/types/resources/ResourceDecorator.java
@@ -74,6 +74,7 @@ public abstract class ResourceDecorator extends Resource {
      * Get the name of the resource.
      * @return the name of the wrapped resource.
      */
+    @Override
     public String getName() {
         return getResource().getName();
     }
@@ -82,6 +83,7 @@ public abstract class ResourceDecorator extends Resource {
      * The exists attribute tells whether a file exists.
      * @return true if this resource exists.
      */
+    @Override
     public boolean isExists() {
         return getResource().isExists();
     }
@@ -92,6 +94,7 @@ public abstract class ResourceDecorator extends Resource {
      * @return 0 if the resource does not exist to mirror the behavior
      * of {@link java.io.File File}.
      */
+    @Override
     public long getLastModified() {
         return getResource().getLastModified();
     }
@@ -100,6 +103,7 @@ public abstract class ResourceDecorator extends Resource {
      * Tells if the resource is a directory.
      * @return boolean flag indicating if the resource is a directory.
      */
+    @Override
     public boolean isDirectory() {
         return getResource().isDirectory();
     }
@@ -109,6 +113,7 @@ public abstract class ResourceDecorator extends Resource {
      * @return the size, as a long, 0 if the Resource does not exist (for
      *         compatibility with java.io.File), or UNKNOWN_SIZE if not known.
      */
+    @Override
     public long getSize() {
         return getResource().getSize();
     }
@@ -121,6 +126,7 @@ public abstract class ResourceDecorator extends Resource {
      * @throws UnsupportedOperationException if InputStreams are not
      *         supported for this Resource type.
      */
+    @Override
     public InputStream getInputStream() throws IOException {
         return getResource().getInputStream();
     }
@@ -133,6 +139,7 @@ public abstract class ResourceDecorator extends Resource {
      * @throws UnsupportedOperationException if OutputStreams are not
      *         supported for this Resource type.
      */
+    @Override
     public OutputStream getOutputStream() throws IOException {
         return getResource().getOutputStream();
     }
@@ -141,6 +148,7 @@ public abstract class ResourceDecorator extends Resource {
      * Fulfill the ResourceCollection contract.
      * @return whether this Resource is a FileProvider.
      */
+    @Override
     public boolean isFilesystemOnly() {
         return as(FileProvider.class) != null;
     }
@@ -149,6 +157,7 @@ public abstract class ResourceDecorator extends Resource {
      * Overrides the base version.
      * @param r the Reference to set.
      */
+    @Override
     public void setRefid(Reference r) {
         if (resource != null) {
             throw noChildrenAllowed();
@@ -159,6 +168,7 @@ public abstract class ResourceDecorator extends Resource {
     /**
      * {@inheritDoc}
      */
+    @Override
     public <T> T as(Class<T> clazz) {
         return getResource().as(clazz);
     }
@@ -166,6 +176,7 @@ public abstract class ResourceDecorator extends Resource {
     /**
      * {@inheritDoc}
      */
+    @Override
     public int compareTo(Resource other) {
         if (other == this) {
             return 0;
@@ -181,7 +192,9 @@ public abstract class ResourceDecorator extends Resource {
      * Get the hash code for this Resource.
      * @return hash code as int.
      */
-    public int hashCode() {
+    @Override
+    public int hashCode() { // NOSONAR
+        // super.equals + compareTo are consistent with this implementation
         return (getClass().hashCode() << 4) | getResource().hashCode();
     }
 
@@ -267,4 +280,5 @@ public abstract class ResourceDecorator extends Resource {
         throw new BuildException("you can't change the size of a "
                                  + getDataTypeName());
     }
+
 }
diff --git a/src/main/org/apache/tools/ant/types/resources/StringResource.java b/src/main/org/apache/tools/ant/types/resources/StringResource.java
index b12a2e14f..fe7b2959e 100644
--- a/src/main/org/apache/tools/ant/types/resources/StringResource.java
+++ b/src/main/org/apache/tools/ant/types/resources/StringResource.java
@@ -71,6 +71,7 @@ public class StringResource extends Resource {
      * Enforce String immutability.
      * @param s the new name/value for this StringResource.
      */
+    @Override
     public synchronized void setName(String s) {
         if (getName() != null) {
             throw new BuildException(new ImmutableResourceException());
@@ -90,6 +91,7 @@ public class StringResource extends Resource {
      * Synchronize access.
      * @return the name/value of this StringResource.
      */
+    @Override
     public synchronized String getName() {
         return super.getName();
     }
@@ -107,6 +109,7 @@ public class StringResource extends Resource {
      *
      * @return true if this resource exists.
      */
+    @Override
     public boolean isExists() {
         return getValue() != null;
     }
@@ -144,6 +147,7 @@ public class StringResource extends Resource {
      * @return the size, as a long, 0 if the Resource does not exist (for
      *         compatibility with java.io.File), or UNKNOWN_SIZE if not known.
      */
+    @Override
     public synchronized long getSize() {
         return isReference() ? ((Resource) getCheckedRef()).getSize()
                 : getContent().length();
@@ -153,7 +157,9 @@ public class StringResource extends Resource {
      * Get the hash code for this Resource.
      * @return hash code as int.
      */
+    @Override
     public synchronized int hashCode() {
+        // super.equals + super.compareTo are consistent with this implementation
         if (isReference()) {
             return getCheckedRef().hashCode();
         }
@@ -166,6 +172,7 @@ public class StringResource extends Resource {
      * @return the string contents of the resource.
      * @since Ant 1.7
      */
+    @Override
     public String toString() {
         return String.valueOf(getContent());
     }
@@ -178,6 +185,7 @@ public class StringResource extends Resource {
      * @throws UnsupportedOperationException if InputStreams are not
      *         supported for this Resource type.
      */
+    @Override
     public synchronized InputStream getInputStream() throws IOException {
         if (isReference()) {
             return ((Resource) getCheckedRef()).getInputStream();
@@ -198,6 +206,7 @@ public class StringResource extends Resource {
      * @throws UnsupportedOperationException if OutputStreams are not
      *         supported for this Resource type.
      */
+    @Override
     public synchronized OutputStream getOutputStream() throws IOException {
         if (isReference()) {
             return ((Resource) getCheckedRef()).getOutputStream();
@@ -212,6 +221,7 @@ public class StringResource extends Resource {
      * Overrides the super version.
      * @param r the Reference to set.
      */
+    @Override
     public void setRefid(Reference r) {
         if (encoding != DEFAULT_ENCODING) {
             throw tooManyAttributes();
@@ -250,6 +260,7 @@ public class StringResource extends Resource {
             baos = (ByteArrayOutputStream) out;
         }
 
+        @Override
         public void close() throws IOException {
             super.close();
             String result = encoding == null
diff --git a/src/main/org/apache/tools/ant/types/resources/URLResource.java b/src/main/org/apache/tools/ant/types/resources/URLResource.java
index 70d6c9baa..027a9bd51 100644
--- a/src/main/org/apache/tools/ant/types/resources/URLResource.java
+++ b/src/main/org/apache/tools/ant/types/resources/URLResource.java
@@ -313,7 +313,7 @@ public class URLResource extends Resource implements URLProvider {
         if (isReference()) {
             return getCheckedRef().equals(another);
         }
-        if (another == null || !(another.getClass().equals(getClass()))) {
+        if (another == null || another.getClass() != getClass()) {
             return false;
         }
         URLResource otheru = (URLResource) another;
diff --git a/src/main/org/apache/tools/ant/util/OutputStreamFunneler.java b/src/main/org/apache/tools/ant/util/OutputStreamFunneler.java
index 6694c3f07..9b4cef3c6 100644
--- a/src/main/org/apache/tools/ant/util/OutputStreamFunneler.java
+++ b/src/main/org/apache/tools/ant/util/OutputStreamFunneler.java
@@ -143,8 +143,14 @@ public class OutputStreamFunneler {
         if (!funnel.closed) {
             try {
                 if (timeoutMillis > 0) {
+                    final long start = System.currentTimeMillis();
+                    final long end = start + timeoutMillis;
+                    long now = System.currentTimeMillis();
                     try {
-                        wait(timeoutMillis);
+                        while (now < end) {
+                            wait(end - now);
+                            now = System.currentTimeMillis();
+                        }
                     } catch (InterruptedException eyeEx) {
                         //ignore
                     }
diff --git a/src/main/org/apache/tools/ant/util/ResourceUtils.java b/src/main/org/apache/tools/ant/util/ResourceUtils.java
index 6397f714b..518ed5ad5 100644
--- a/src/main/org/apache/tools/ant/util/ResourceUtils.java
+++ b/src/main/org/apache/tools/ant/util/ResourceUtils.java
@@ -72,7 +72,7 @@ public class ResourceUtils {
      */
     public static final String ISO_8859_1 = "ISO-8859-1";
 
-    private static final long MAX_IO_CHUNK_SIZE = 16*1024*1024; // 16 MB
+    private static final long MAX_IO_CHUNK_SIZE = 16*1024*1024l; // 16 MB
 
     /**
      * Tells which source files should be reprocessed based on the
@@ -630,7 +630,7 @@ public class ResourceUtils {
                 }
                 expected = in1.readLine();
             }
-            return in2.readLine() == null ? 0 : -1;
+            return in2.readLine() == null ? 0 : -1; //NOSONAR
         } finally {
             FileUtils.close(in1);
             FileUtils.close(in2);
diff --git a/src/main/org/apache/tools/ant/util/WorkerAnt.java b/src/main/org/apache/tools/ant/util/WorkerAnt.java
index 288d74dd5..768f38744 100644
--- a/src/main/org/apache/tools/ant/util/WorkerAnt.java
+++ b/src/main/org/apache/tools/ant/util/WorkerAnt.java
@@ -117,9 +117,13 @@ public class WorkerAnt extends Thread {
      * @throws InterruptedException if the execution was interrupted
      */
     public void waitUntilFinished(long timeout) throws InterruptedException {
+        final long start = System.currentTimeMillis();
+        final long end = start + timeout;
         synchronized (notify) {
-            if (!finished) {
-                notify.wait(timeout);
+            long now = System.currentTimeMillis();
+            while (!finished && now < end) {
+                notify.wait(end - now);
+                now = System.currentTimeMillis();
             }
         }
     }
diff --git a/src/main/org/apache/tools/bzip2/BlockSort.java b/src/main/org/apache/tools/bzip2/BlockSort.java
index b382470f8..073b2230e 100644
--- a/src/main/org/apache/tools/bzip2/BlockSort.java
+++ b/src/main/org/apache/tools/bzip2/BlockSort.java
@@ -975,7 +975,7 @@ class BlockSort {
             runningOrder[i] = i;
         }
 
-        for (int h = 364; h != 1;) {
+        for (int h = 364; h != 1;) { //NOSONAR
             h /= 3;
             for (int i = h; i <= 255; i++) {
                 final int vv = runningOrder[i];
diff --git a/src/main/org/apache/tools/tar/TarUtils.java b/src/main/org/apache/tools/tar/TarUtils.java
index 12bd1da32..f86154ea3 100644
--- a/src/main/org/apache/tools/tar/TarUtils.java
+++ b/src/main/org/apache/tools/tar/TarUtils.java
@@ -191,7 +191,7 @@ public class TarUtils {
         if (negative) {
             // 2's complement
             val--;
-            val ^= (long) Math.pow(2, (length - 1) * 8) - 1;
+            val ^= (long) Math.pow(2, (length - 1) * 8.0) - 1;
         }
         return negative ? -val : val;
     }
diff --git a/src/main/org/apache/tools/zip/UnsupportedZipFeatureException.java b/src/main/org/apache/tools/zip/UnsupportedZipFeatureException.java
index 21d48f204..291d494d7 100644
--- a/src/main/org/apache/tools/zip/UnsupportedZipFeatureException.java
+++ b/src/main/org/apache/tools/zip/UnsupportedZipFeatureException.java
@@ -28,8 +28,8 @@ import java.util.zip.ZipException;
 public class UnsupportedZipFeatureException extends ZipException {
 
     private final Feature reason;
-    private final ZipEntry entry;
-    private static final long serialVersionUID = 4430521921766595597L;
+    private transient final ZipEntry entry;
+    private static final long serialVersionUID = 20161221L;
 
     /**
      * Creates an exception.
@@ -61,7 +61,7 @@ public class UnsupportedZipFeatureException extends ZipException {
     /**
      * ZIP Features that may or may not be supported.
      */
-    public static class Feature {
+    public static class Feature implements java.io.Serializable {
         /**
          * The entry is encrypted.
          */
@@ -86,4 +86,4 @@ public class UnsupportedZipFeatureException extends ZipException {
             return name;
         }
     }
-}
\ No newline at end of file
+}