NIFI-259: Fixed checkstyle violations

nifi-api/src/main/java/org/apache/nifi/annotation/behavior/Stateful.java

@@ -44,15 +44,11 @@ import org.apache.nifi.components.state.StateManager;
 public @interface Stateful {
     /**
      * Provides a description of what information is being stored in the {@link StateManager}
-     *
-     * @return a description of what information is being stored in the {@link StateManager}
      */
     String description();
 
     /**
      * Indicates the Scope(s) associated with the State that is stored and retrieved.
-     *
-     * @return
      */
     Scope[]scopes();
 }

nifi-api/src/main/java/org/apache/nifi/components/state/StateManager.java

@@ -69,8 +69,8 @@ public interface StateManager {
      * If the state has not yet been set, the StateMap's version will be -1, and the map of values will be empty.
      *
      * @param scope the scope to use when fetching the state
-     * @return
-     * @throws IOException
+     * @return the current state for the component
+     * @throws IOException if unable to communicate with the underlying storage mechanism
      */
     StateMap getState(Scope scope) throws IOException;
 

nifi-api/src/main/java/org/apache/nifi/components/state/StateMap.java

@@ -35,7 +35,7 @@ public interface StateMap {
 
     /**
      * Returns the value associated with the given key
-     * 
+     *
      * @param key the key whose value should be retrieved
      * @return the value associated with the given key, or <code>null</code> if no value is associated
      *         with this key.

nifi-api/src/main/java/org/apache/nifi/processor/ProcessSession.java

@@ -25,7 +25,6 @@ import java.util.Map;
 import java.util.Set;
 import java.util.regex.Pattern;
 
-import org.apache.nifi.components.state.StateManager;
 import org.apache.nifi.controller.queue.QueueSize;
 import org.apache.nifi.flowfile.FlowFile;
 import org.apache.nifi.processor.exception.FlowFileAccessException;

nifi-docs/src/main/asciidoc/administration-guide.adoc

@@ -548,6 +548,11 @@ We can initialize our Kerberos ticket by running the following command:
 [source]
 kinit nifi
 
+Note, the above `kinit` command requires that Kerberos client libraries be installed. This is accomplished in Fedora-based Linux distributions via:
+
+[source]
+yum install krb5-workstation krb5-libs krb5-auth-dialog
+
 Now, when we start NiFi, it will use Kerberos to authentication as the `nifi` user when communicating with ZooKeeper.
 
 

nifi-mock/src/main/java/org/apache/nifi/util/StandardProcessorTestRunner.java

@@ -798,8 +798,8 @@ public class StandardProcessorTestRunner implements TestRunner {
     /**
      * Returns the State Manager for the given Controller Service.
      *
-     * @param controllerService
-     * @return
+     * @param controllerService the Controller Service whose State Manager should be returned
+     * @return the State Manager for the given Controller Service
      */
     @Override
     public MockStateManager getStateManager(final ControllerService controllerService) {

nifi-nar-bundles/nifi-framework-bundle/nifi-framework/nifi-framework-core-api/src/main/java/org/apache/nifi/controller/ConfiguredComponent.java

@@ -36,7 +36,7 @@ public interface ConfiguredComponent {
 
     /**
      * Sets the property with the given name to the given value
-     * 
+     *
      * @param name the name of the property to update
      * @param value the value to update the property to
      * @param triggerOnPropertyModified if <code>true</code>, will trigger the #onPropertyModified method of the component

nifi-nar-bundles/nifi-framework-bundle/nifi-framework/nifi-framework-core-api/src/main/java/org/apache/nifi/logging/LogRepository.java

@@ -67,7 +67,7 @@ public interface LogRepository {
 
     /**
      * Sets the current logger for the component
-     * 
+     *
      * @param logger the logger to use
      */
     void setLogger(ComponentLog logger);

nifi-nar-bundles/nifi-framework-bundle/nifi-framework/nifi-framework-core/src/main/java/org/apache/nifi/controller/scheduling/StandardProcessScheduler.java

@@ -122,7 +122,7 @@ public final class StandardProcessScheduler implements ProcessScheduler {
 
     /**
      * Submits the given task to be executed exactly once in a background thread
-     * 
+     *
      * @param task the task to perform
      */
     public void submitFrameworkTask(final Runnable task) {

nifi-nar-bundles/nifi-hadoop-bundle/nifi-hdfs-processors/src/main/java/org/apache/nifi/processors/hadoop/util/HDFSListing.java

@@ -89,9 +89,9 @@ public class HDFSListing {
     }
 
     /**
-     * Converts this HDFSListing into a Map<String, String> so that it can be stored in a StateManager.
+     * Converts this HDFSListing into a Map&lt;String, String&gt; so that it can be stored in a StateManager.
      *
-     * @return a Map<String, String> that represents the same information as this HDFSListing
+     * @return a Map that represents the same information as this HDFSListing
      */
     public Map<String, String> toMap() {
         final Map<String, String> map = new HashMap<>(1 + matchingPaths.size());

nifi-nar-bundles/nifi-standard-bundle/nifi-standard-processors/src/main/java/org/apache/nifi/processors/standard/TailFile.java

@@ -192,7 +192,7 @@ public class TailFile extends AbstractProcessor {
      * Recovers values for the State that was stored in a local file.
      *
      * @param context the ProcessContext that indicates where the state is stored
-     * @return a Map<String, String> that contains the keys defined in {@link TailFileState.StateKeys}
+     * @return a Map that contains the keys defined in {@link TailFileState.StateKeys}
      * @throws IOException if the state file exists but was unable to be read
      */
     private Map<String, String> recoverStateValuesFromFile(final ProcessContext context) throws IOException {