removed unused imports

core/src/main/java/hudson/PluginManager.java

@@ -109,7 +109,6 @@ import edu.umd.cs.findbugs.annotations.CheckForNull;
 import edu.umd.cs.findbugs.annotations.NonNull;
 import javax.servlet.ServletContext;
 import javax.servlet.ServletException;
-import javax.swing.text.NumberFormatter;
 import javax.xml.parsers.ParserConfigurationException;
 import javax.xml.parsers.SAXParserFactory;
 import java.io.ByteArrayInputStream;

core/src/main/java/hudson/UDPBroadcastThread.java

@@ -25,12 +25,10 @@
 package hudson;
 
 import hudson.init.Initializer;
-import jenkins.model.Jenkins;
 import jenkins.util.SystemProperties;
 import org.kohsuke.accmod.Restricted;
 import org.kohsuke.accmod.restrictions.NoExternalUse;
 
-import java.io.IOException;
 import java.util.logging.Logger;
 
 import static hudson.init.InitMilestone.COMPLETED;

core/src/main/java/hudson/cli/CreateNodeCommand.java

@@ -27,8 +27,6 @@ package hudson.cli;
 import hudson.Extension;
 import hudson.model.Computer;
 import hudson.model.Node;
-import hudson.model.Slave;
-import hudson.model.User;
 import jenkins.model.Jenkins;
 
 import org.kohsuke.args4j.Argument;

core/src/main/java/hudson/model/AbstractCIBase.java

@@ -33,11 +33,8 @@ import hudson.slaves.RetentionStrategy;
 import jenkins.model.Jenkins;
 import org.kohsuke.stapler.StaplerFallback;
 import org.kohsuke.stapler.StaplerProxy;
-import org.kohsuke.accmod.Restricted;
-import org.kohsuke.accmod.restrictions.NoExternalUse;
 
 import java.util.*;
-import java.util.concurrent.CopyOnWriteArraySet;
 import java.util.logging.Level;
 import java.util.logging.Logger;
 import edu.umd.cs.findbugs.annotations.CheckForNull;

core/src/main/java/hudson/model/Descriptor.java

@@ -24,7 +24,6 @@
 package hudson.model;
 
 import hudson.DescriptorExtensionList;
-import hudson.Extension;
 import hudson.PluginWrapper;
 import hudson.RelativePath;
 import hudson.XmlFile;

core/src/main/java/hudson/model/FileParameterValue.java

@@ -36,11 +36,8 @@ import java.io.OutputStream;
 import java.io.UnsupportedEncodingException;
 import java.nio.file.Files;
 import java.nio.file.InvalidPathException;
-import java.nio.file.Path;
 import java.util.regex.Pattern;
-import javax.servlet.ServletException;
 
-import jenkins.util.SystemProperties;
 import org.apache.commons.fileupload.FileItem;
 import org.apache.commons.fileupload.FileItemHeaders;
 import org.apache.commons.fileupload.disk.DiskFileItem;

core/src/main/java/hudson/model/ItemGroup.java

@@ -25,7 +25,6 @@ package hudson.model;
 
 import hudson.model.listeners.ItemListener;
 import java.io.IOException;
-import java.util.ArrayList;
 import java.util.Collection;
 import java.io.File;
 import java.util.List;

core/src/main/java/hudson/model/Label.java

@@ -58,7 +58,6 @@ import org.kohsuke.stapler.export.ExportedBean;
 
 import java.io.Serializable;
 import java.io.StringReader;
-import java.util.ArrayList;
 import java.util.Collection;
 import java.util.Collections;
 import java.util.Comparator;

core/src/main/java/hudson/model/StringParameterDefinition.java

@@ -109,6 +109,7 @@ public class StringParameterDefinition extends SimpleParameterDefinition {
     @Extension @Symbol({"string","stringParam"})
     public static class DescriptorImpl extends ParameterDescriptor {
         @Override
+        @NonNull
         public String getDisplayName() {
             return Messages.StringParameterDefinition_DisplayName();
         }

core/src/main/java/hudson/model/TimeZoneProperty.java

@@ -6,7 +6,6 @@ import hudson.util.ListBoxModel.Option;
 import edu.umd.cs.findbugs.annotations.CheckForNull;
 import edu.umd.cs.findbugs.annotations.NonNull;
 import edu.umd.cs.findbugs.annotations.Nullable;
-import java.io.IOException;
 import java.util.TimeZone;
 import java.util.logging.Logger;
 import java.util.logging.Level;

core/src/main/java/hudson/security/ACL.java

@@ -27,8 +27,6 @@ import hudson.model.User;
 import hudson.model.View;
 import hudson.model.ViewDescriptor;
 import hudson.model.ViewGroup;
-import java.util.Arrays;
-import java.util.HashSet;
 import java.util.LinkedHashSet;
 import java.util.Set;
 import java.util.stream.Collectors;

core/src/main/java/jenkins/install/SetupWizard.java

@@ -53,7 +53,6 @@ import hudson.security.FullControlOnceLoggedInAuthorizationStrategy;
 import hudson.security.HudsonPrivateSecurityRealm;
 import hudson.security.SecurityRealm;
 import hudson.security.csrf.CrumbIssuer;
-import hudson.security.csrf.DefaultCrumbIssuer;
 import hudson.util.HttpResponses;
 import hudson.util.PluginServletFilter;
 import hudson.util.VersionNumber;

core/src/main/java/jenkins/model/Jenkins.java

@@ -37,7 +37,6 @@ import com.thoughtworks.xstream.XStream;
 import edu.umd.cs.findbugs.annotations.SuppressFBWarnings;
 import hudson.*;
 import hudson.Launcher.LocalLauncher;
-import hudson.security.csrf.DefaultCrumbIssuer;
 import hudson.security.csrf.GlobalCrumbIssuerConfiguration;
 import jenkins.AgentProtocol;
 import jenkins.diagnostics.URICheckEncodingMonitor;

core/src/main/java/jenkins/security/ConfidentialStore.java

@@ -14,7 +14,6 @@ import java.security.NoSuchAlgorithmException;
 import java.security.SecureRandom;
 import java.util.Iterator;
 import java.util.Map;
-import java.util.Random;
 import java.util.ServiceConfigurationError;
 import java.util.ServiceLoader;
 import java.util.concurrent.ConcurrentHashMap;

core/src/main/java/jenkins/security/ExceptionTranslationFilter.java

@@ -42,9 +42,6 @@ import javax.servlet.http.HttpServletRequest;
 import javax.servlet.http.HttpServletResponse;
 import javax.servlet.http.HttpSession;
 import java.io.IOException;
-import java.util.Collections;
-import java.util.IdentityHashMap;
-import java.util.Set;
 import java.util.logging.Level;
 import java.util.logging.Logger;
 

core/src/main/java/jenkins/security/HMACConfidentialKey.java

@@ -11,7 +11,6 @@ import java.nio.charset.StandardCharsets;
 import java.security.GeneralSecurityException;
 import java.security.MessageDigest;
 import java.security.NoSuchAlgorithmException;
-import java.util.Arrays;
 
 /**
  * {@link ConfidentialKey} that's used for creating a token by hashing some information with secret