diff --git a/gerrit-gwtui-common/src/main/java/com/google/gerrit/client/info/ChangeInfo.java b/gerrit-gwtui-common/src/main/java/com/google/gerrit/client/info/ChangeInfo.java
index 866d74fe0e..3587bf8519 100644
--- a/gerrit-gwtui-common/src/main/java/com/google/gerrit/client/info/ChangeInfo.java
+++ b/gerrit-gwtui-common/src/main/java/com/google/gerrit/client/info/ChangeInfo.java
@@ -14,6 +14,8 @@
 
 package com.google.gerrit.client.info;
 
+import static java.util.Comparator.comparing;
+
 import com.google.gerrit.client.rpc.NativeMap;
 import com.google.gerrit.client.rpc.NativeString;
 import com.google.gerrit.client.rpc.Natives;
@@ -31,7 +33,6 @@ import com.google.gwtjsonrpc.client.impl.ser.JavaSqlTimestamp_JsonSerializer;
 import java.sql.Timestamp;
 import java.util.ArrayList;
 import java.util.Collections;
-import java.util.Comparator;
 import java.util.HashMap;
 import java.util.HashSet;
 import java.util.List;
@@ -449,16 +450,7 @@ public class ChangeInfo extends JavaScriptObject {
       final int editParent = findEditParent(list);
       Collections.sort(
           Natives.asList(list),
-          new Comparator<RevisionInfo>() {
-            @Override
-            public int compare(RevisionInfo a, RevisionInfo b) {
-              return num(a) - num(b);
-            }
-
-            private int num(RevisionInfo r) {
-              return !r.isEdit() ? 2 * (r._number() - 1) + 1 : 2 * editParent;
-            }
-          });
+          comparing(r -> !r.isEdit() ? 2 * (r._number() - 1) + 1 : 2 * editParent));
     }
 
     public static int findEditParent(JsArray<RevisionInfo> list) {
diff --git a/gerrit-gwtui/src/main/java/com/google/gerrit/client/account/MyGpgKeysScreen.java b/gerrit-gwtui/src/main/java/com/google/gerrit/client/account/MyGpgKeysScreen.java
index 0dc1dab8a4..bbd94f27e7 100644
--- a/gerrit-gwtui/src/main/java/com/google/gerrit/client/account/MyGpgKeysScreen.java
+++ b/gerrit-gwtui/src/main/java/com/google/gerrit/client/account/MyGpgKeysScreen.java
@@ -14,6 +14,8 @@
 
 package com.google.gerrit.client.account;
 
+import static java.util.Comparator.comparing;
+
 import com.google.gerrit.client.Gerrit;
 import com.google.gerrit.client.info.GpgKeyInfo;
 import com.google.gerrit.client.rpc.GerritCallback;
@@ -41,7 +43,6 @@ import com.google.gwtexpui.clippy.client.CopyableLabel;
 import com.google.gwtexpui.globalkey.client.NpTextArea;
 import java.util.ArrayList;
 import java.util.Collections;
-import java.util.Comparator;
 import java.util.List;
 
 public class MyGpgKeysScreen extends SettingsScreen {
@@ -118,14 +119,7 @@ public class MyGpgKeysScreen extends SettingsScreen {
                     List<GpgKeyInfo> list = Natives.asList(result.values());
                     // TODO(dborowitz): Sort on something more meaningful, like
                     // created date?
-                    Collections.sort(
-                        list,
-                        new Comparator<GpgKeyInfo>() {
-                          @Override
-                          public int compare(GpgKeyInfo a, GpgKeyInfo b) {
-                            return a.id().compareTo(b.id());
-                          }
-                        });
+                    Collections.sort(list, comparing(GpgKeyInfo::id));
                     keys.clear();
                     keyText.setText("");
                     errorPanel.setVisible(false);
diff --git a/gerrit-gwtui/src/main/java/com/google/gerrit/client/admin/AccountGroupMembersScreen.java b/gerrit-gwtui/src/main/java/com/google/gerrit/client/admin/AccountGroupMembersScreen.java
index 2614224ecd..6eaab5d6b4 100644
--- a/gerrit-gwtui/src/main/java/com/google/gerrit/client/admin/AccountGroupMembersScreen.java
+++ b/gerrit-gwtui/src/main/java/com/google/gerrit/client/admin/AccountGroupMembersScreen.java
@@ -14,6 +14,8 @@
 
 package com.google.gerrit.client.admin;
 
+import static java.util.Comparator.comparing;
+
 import com.google.gerrit.client.Dispatcher;
 import com.google.gerrit.client.Gerrit;
 import com.google.gerrit.client.VoidResult;
@@ -29,7 +31,6 @@ import com.google.gerrit.client.ui.AddMemberBox;
 import com.google.gerrit.client.ui.FancyFlexTable;
 import com.google.gerrit.client.ui.Hyperlink;
 import com.google.gerrit.client.ui.SmallHeading;
-import com.google.gerrit.common.Nullable;
 import com.google.gerrit.reviewdb.client.AccountGroup;
 import com.google.gwt.event.dom.client.ClickEvent;
 import com.google.gwt.event.dom.client.ClickHandler;
@@ -295,26 +296,9 @@ public class AccountGroupMembersScreen extends AccountGroupScreen {
 
     void insert(AccountInfo info) {
       Comparator<AccountInfo> c =
-          new Comparator<AccountInfo>() {
-            @Override
-            public int compare(AccountInfo a, AccountInfo b) {
-              int cmp = nullToEmpty(a.name()).compareTo(nullToEmpty(b.name()));
-              if (cmp != 0) {
-                return cmp;
-              }
-
-              cmp = nullToEmpty(a.email()).compareTo(nullToEmpty(b.email()));
-              if (cmp != 0) {
-                return cmp;
-              }
-
-              return a._accountId() - b._accountId();
-            }
-
-            public String nullToEmpty(String str) {
-              return str == null ? "" : str;
-            }
-          };
+          comparing((AccountInfo a) -> nullToEmpty(a.name()))
+              .thenComparing(a -> nullToEmpty(a.email()))
+              .thenComparing(AccountInfo::_accountId);
       int insertPos = getInsertRow(c, info);
       if (insertPos >= 0) {
         table.insertRow(insertPos);
@@ -405,20 +389,7 @@ public class AccountGroupMembersScreen extends AccountGroupScreen {
 
     void insert(GroupInfo info) {
       Comparator<GroupInfo> c =
-          new Comparator<GroupInfo>() {
-            @Override
-            public int compare(GroupInfo a, GroupInfo b) {
-              int cmp = nullToEmpty(a.name()).compareTo(nullToEmpty(b.name()));
-              if (cmp != 0) {
-                return cmp;
-              }
-              return a.getGroupUUID().compareTo(b.getGroupUUID());
-            }
-
-            private String nullToEmpty(@Nullable String str) {
-              return (str == null) ? "" : str;
-            }
-          };
+          comparing((GroupInfo g) -> nullToEmpty(g.name())).thenComparing(GroupInfo::getGroupUUID);
       int insertPos = getInsertRow(c, info);
       if (insertPos >= 0) {
         table.insertRow(insertPos);
@@ -457,4 +428,9 @@ public class AccountGroupMembersScreen extends AccountGroupScreen {
       setRowItem(row, i);
     }
   }
+
+  // Like Guava's Strings#nullToEmpty, which can't be used in GWT UI code.
+  private static String nullToEmpty(String str) {
+    return str == null ? "" : str;
+  }
 }
diff --git a/gerrit-gwtui/src/main/java/com/google/gerrit/client/admin/GroupTable.java b/gerrit-gwtui/src/main/java/com/google/gerrit/client/admin/GroupTable.java
index 259847ec65..c09f93622a 100644
--- a/gerrit-gwtui/src/main/java/com/google/gerrit/client/admin/GroupTable.java
+++ b/gerrit-gwtui/src/main/java/com/google/gerrit/client/admin/GroupTable.java
@@ -14,6 +14,8 @@
 
 package com.google.gerrit.client.admin;
 
+import static java.util.Comparator.comparing;
+
 import com.google.gerrit.client.Dispatcher;
 import com.google.gerrit.client.Gerrit;
 import com.google.gerrit.client.groups.GroupList;
@@ -33,7 +35,6 @@ import com.google.gwt.user.client.ui.FlexTable.FlexCellFormatter;
 import com.google.gwt.user.client.ui.HTMLTable.Cell;
 import com.google.gwt.user.client.ui.Image;
 import java.util.Collections;
-import java.util.Comparator;
 import java.util.List;
 
 public class GroupTable extends NavigationTable<GroupInfo> {
@@ -105,14 +106,7 @@ public class GroupTable extends NavigationTable<GroupInfo> {
       table.removeRow(table.getRowCount() - 1);
     }
 
-    Collections.sort(
-        list,
-        new Comparator<GroupInfo>() {
-          @Override
-          public int compare(GroupInfo a, GroupInfo b) {
-            return a.name().compareTo(b.name());
-          }
-        });
+    Collections.sort(list, comparing(GroupInfo::name));
     for (GroupInfo group : list.subList(fromIndex, toIndex)) {
       final int row = table.getRowCount();
       table.insertRow(row);
diff --git a/gerrit-gwtui/src/main/java/com/google/gerrit/client/changes/AccountDashboardScreen.java b/gerrit-gwtui/src/main/java/com/google/gerrit/client/changes/AccountDashboardScreen.java
index c6e4e2f247..495a3d4661 100644
--- a/gerrit-gwtui/src/main/java/com/google/gerrit/client/changes/AccountDashboardScreen.java
+++ b/gerrit-gwtui/src/main/java/com/google/gerrit/client/changes/AccountDashboardScreen.java
@@ -14,6 +14,8 @@
 
 package com.google.gerrit.client.changes;
 
+import static java.util.Comparator.comparing;
+
 import com.google.gerrit.client.Gerrit;
 import com.google.gerrit.client.NotFoundScreen;
 import com.google.gerrit.client.info.ChangeInfo;
@@ -187,16 +189,7 @@ public class AccountDashboardScreen extends Screen implements ChangeListScreen {
   }
 
   private Comparator<ChangeInfo> outComparator() {
-    return new Comparator<ChangeInfo>() {
-      @Override
-      public int compare(ChangeInfo a, ChangeInfo b) {
-        int cmp = a.created().compareTo(b.created());
-        if (cmp != 0) {
-          return cmp;
-        }
-        return a._number() - b._number();
-      }
-    };
+    return comparing(ChangeInfo::created).thenComparing(ChangeInfo::_number);
   }
 
   private boolean hasChanges(JsArray<ChangeList> result) {
diff --git a/gerrit-gwtui/src/main/java/com/google/gerrit/client/dashboards/DashboardsTable.java b/gerrit-gwtui/src/main/java/com/google/gerrit/client/dashboards/DashboardsTable.java
index 0e4ef4e29c..1a2f502b56 100644
--- a/gerrit-gwtui/src/main/java/com/google/gerrit/client/dashboards/DashboardsTable.java
+++ b/gerrit-gwtui/src/main/java/com/google/gerrit/client/dashboards/DashboardsTable.java
@@ -14,6 +14,8 @@
 
 package com.google.gerrit.client.dashboards;
 
+import static java.util.Comparator.comparing;
+
 import com.google.gerrit.client.Gerrit;
 import com.google.gerrit.client.rpc.Natives;
 import com.google.gerrit.client.ui.NavigationTable;
@@ -26,7 +28,6 @@ import com.google.gwt.user.client.ui.FlexTable.FlexCellFormatter;
 import com.google.gwt.user.client.ui.Image;
 import java.util.ArrayList;
 import java.util.Collections;
-import java.util.Comparator;
 import java.util.HashMap;
 import java.util.List;
 import java.util.Map;
@@ -75,14 +76,7 @@ public class DashboardsTable extends NavigationTable<DashboardInfo> {
       table.removeRow(table.getRowCount() - 1);
     }
 
-    Collections.sort(
-        list,
-        new Comparator<DashboardInfo>() {
-          @Override
-          public int compare(DashboardInfo a, DashboardInfo b) {
-            return a.id().compareTo(b.id());
-          }
-        });
+    Collections.sort(list, comparing(DashboardInfo::id));
 
     String ref = null;
     for (DashboardInfo d : list) {
diff --git a/gerrit-gwtui/src/main/java/com/google/gerrit/client/diff/CommentsCollections.java b/gerrit-gwtui/src/main/java/com/google/gerrit/client/diff/CommentsCollections.java
index 533b74598a..5db62bd20f 100644
--- a/gerrit-gwtui/src/main/java/com/google/gerrit/client/diff/CommentsCollections.java
+++ b/gerrit-gwtui/src/main/java/com/google/gerrit/client/diff/CommentsCollections.java
@@ -14,6 +14,8 @@
 
 package com.google.gerrit.client.diff;
 
+import static java.util.Comparator.comparing;
+
 import com.google.gerrit.client.DiffObject;
 import com.google.gerrit.client.Gerrit;
 import com.google.gerrit.client.changes.CommentApi;
@@ -28,7 +30,6 @@ import com.google.gerrit.reviewdb.client.Project;
 import com.google.gwt.core.client.JsArray;
 import com.google.gwt.user.client.rpc.AsyncCallback;
 import java.util.Collections;
-import java.util.Comparator;
 
 /** Collection of published and draft comments loaded from the server. */
 class CommentsCollections {
@@ -158,14 +159,7 @@ class CommentsCollections {
       for (CommentInfo c : Natives.asList(in)) {
         c.path(path);
       }
-      Collections.sort(
-          Natives.asList(in),
-          new Comparator<CommentInfo>() {
-            @Override
-            public int compare(CommentInfo a, CommentInfo b) {
-              return a.updated().compareTo(b.updated());
-            }
-          });
+      Collections.sort(Natives.asList(in), comparing(CommentInfo::updated));
     }
     return in;
   }
diff --git a/gerrit-gwtui/src/main/java/com/google/gerrit/client/diff/UnifiedChunkManager.java b/gerrit-gwtui/src/main/java/com/google/gerrit/client/diff/UnifiedChunkManager.java
index 1a662e2127..98ad023c9d 100644
--- a/gerrit-gwtui/src/main/java/com/google/gerrit/client/diff/UnifiedChunkManager.java
+++ b/gerrit-gwtui/src/main/java/com/google/gerrit/client/diff/UnifiedChunkManager.java
@@ -14,6 +14,8 @@
 
 package com.google.gerrit.client.diff;
 
+import static java.util.Comparator.comparing;
+
 import com.google.gerrit.client.diff.DiffInfo.Region;
 import com.google.gerrit.client.diff.DiffInfo.Span;
 import com.google.gerrit.client.rpc.Natives;
@@ -227,12 +229,7 @@ class UnifiedChunkManager extends ChunkManager {
 
   /** Diff chunks are ordered by their starting lines in CodeMirror */
   private Comparator<UnifiedDiffChunkInfo> getDiffChunkComparatorCmLine() {
-    return new Comparator<UnifiedDiffChunkInfo>() {
-      @Override
-      public int compare(UnifiedDiffChunkInfo o1, UnifiedDiffChunkInfo o2) {
-        return o1.getCmLine() - o2.getCmLine();
-      }
-    };
+    return comparing(UnifiedDiffChunkInfo::getCmLine);
   }
 
   @Override
diff --git a/gerrit-gwtui/src/main/java/com/google/gerrit/client/ui/ProjectsTable.java b/gerrit-gwtui/src/main/java/com/google/gerrit/client/ui/ProjectsTable.java
index ac8918084a..74f04ffc76 100644
--- a/gerrit-gwtui/src/main/java/com/google/gerrit/client/ui/ProjectsTable.java
+++ b/gerrit-gwtui/src/main/java/com/google/gerrit/client/ui/ProjectsTable.java
@@ -14,6 +14,8 @@
 
 package com.google.gerrit.client.ui;
 
+import static java.util.Comparator.comparing;
+
 import com.google.gerrit.client.Gerrit;
 import com.google.gerrit.client.projects.ProjectInfo;
 import com.google.gerrit.client.projects.ProjectMap;
@@ -21,7 +23,6 @@ import com.google.gerrit.client.rpc.Natives;
 import com.google.gwt.user.client.ui.FlexTable.FlexCellFormatter;
 import com.google.gwt.user.client.ui.Image;
 import java.util.Collections;
-import java.util.Comparator;
 import java.util.List;
 
 public class ProjectsTable extends NavigationTable<ProjectInfo> {
@@ -69,14 +70,7 @@ public class ProjectsTable extends NavigationTable<ProjectInfo> {
     }
 
     List<ProjectInfo> list = Natives.asList(projects.values());
-    Collections.sort(
-        list,
-        new Comparator<ProjectInfo>() {
-          @Override
-          public int compare(ProjectInfo a, ProjectInfo b) {
-            return a.name().compareTo(b.name());
-          }
-        });
+    Collections.sort(list, comparing(ProjectInfo::name));
     for (ProjectInfo p : list.subList(fromIndex, toIndex)) {
       insert(table.getRowCount(), p);
     }
diff --git a/gerrit-gwtui/src/main/java/net/codemirror/mode/ModeInfo.java b/gerrit-gwtui/src/main/java/net/codemirror/mode/ModeInfo.java
index c6f113ede6..ff12a07e39 100644
--- a/gerrit-gwtui/src/main/java/net/codemirror/mode/ModeInfo.java
+++ b/gerrit-gwtui/src/main/java/net/codemirror/mode/ModeInfo.java
@@ -14,6 +14,8 @@
 
 package net.codemirror.mode;
 
+import static java.util.Comparator.comparing;
+
 import com.google.gerrit.client.rpc.NativeMap;
 import com.google.gerrit.client.rpc.Natives;
 import com.google.gwt.core.client.JavaScriptObject;
@@ -22,7 +24,6 @@ import com.google.gwt.core.client.JsArrayString;
 import com.google.gwt.resources.client.DataResource;
 import com.google.gwt.safehtml.shared.SafeUri;
 import java.util.Collections;
-import java.util.Comparator;
 import java.util.HashMap;
 import java.util.Map;
 
@@ -242,14 +243,7 @@ public class ModeInfo extends JavaScriptObject {
         byMime.put(m.mode(), m);
       }
     }
-    Collections.sort(
-        Natives.asList(filtered),
-        new Comparator<ModeInfo>() {
-          @Override
-          public int compare(ModeInfo a, ModeInfo b) {
-            return a.name().toLowerCase().compareTo(b.name().toLowerCase());
-          }
-        });
+    Collections.sort(Natives.asList(filtered), comparing((ModeInfo m) -> m.name().toLowerCase()));
     setAll(filtered);
   }
 
diff --git a/java/com/google/gerrit/pgm/init/InitPlugins.java b/java/com/google/gerrit/pgm/init/InitPlugins.java
index 385d20ca82..7f5590308b 100644
--- a/java/com/google/gerrit/pgm/init/InitPlugins.java
+++ b/java/com/google/gerrit/pgm/init/InitPlugins.java
@@ -14,7 +14,8 @@
 
 package com.google.gerrit.pgm.init;
 
-import com.google.common.collect.FluentIterable;
+import static java.util.Comparator.comparing;
+
 import com.google.gerrit.common.PluginData;
 import com.google.gerrit.pgm.init.api.ConsoleUI;
 import com.google.gerrit.pgm.init.api.InitFlags;
@@ -25,12 +26,11 @@ import com.google.inject.Inject;
 import com.google.inject.Injector;
 import com.google.inject.Singleton;
 import java.io.IOException;
-import java.io.InputStream;
 import java.nio.file.Files;
 import java.nio.file.Path;
 import java.util.ArrayList;
 import java.util.Collection;
-import java.util.Comparator;
+import java.util.Collections;
 import java.util.List;
 import java.util.jar.Attributes;
 import java.util.jar.JarFile;
@@ -58,25 +58,16 @@ public class InitPlugins implements InitStep {
       throws IOException {
     final List<PluginData> result = new ArrayList<>();
     pluginsDistribution.foreach(
-        new PluginsDistribution.Processor() {
-          @Override
-          public void process(String pluginName, InputStream in) throws IOException {
-            Path tmpPlugin = JarPluginProvider.storeInTemp(pluginName, in, site);
-            String pluginVersion = getVersion(tmpPlugin);
-            if (deleteTempPluginFile) {
-              Files.delete(tmpPlugin);
-            }
-            result.add(new PluginData(pluginName, pluginVersion, tmpPlugin));
+        (pluginName, in) -> {
+          Path tmpPlugin = JarPluginProvider.storeInTemp(pluginName, in, site);
+          String pluginVersion = getVersion(tmpPlugin);
+          if (deleteTempPluginFile) {
+            Files.delete(tmpPlugin);
           }
+          result.add(new PluginData(pluginName, pluginVersion, tmpPlugin));
         });
-    return FluentIterable.from(result)
-        .toSortedList(
-            new Comparator<PluginData>() {
-              @Override
-              public int compare(PluginData a, PluginData b) {
-                return a.name.compareTo(b.name);
-              }
-            });
+    Collections.sort(result, comparing(p -> p.name));
+    return result;
   }
 
   private final ConsoleUI ui;
diff --git a/java/com/google/gerrit/server/account/GroupBackends.java b/java/com/google/gerrit/server/account/GroupBackends.java
index 803d491ffd..1b1551269f 100644
--- a/java/com/google/gerrit/server/account/GroupBackends.java
+++ b/java/com/google/gerrit/server/account/GroupBackends.java
@@ -14,6 +14,8 @@
 
 package com.google.gerrit.server.account;
 
+import static java.util.Comparator.comparing;
+
 import com.google.common.collect.Iterables;
 import com.google.gerrit.common.Nullable;
 import com.google.gerrit.common.data.GroupReference;
@@ -25,12 +27,7 @@ import java.util.Comparator;
 public class GroupBackends {
 
   public static final Comparator<GroupReference> GROUP_REF_NAME_COMPARATOR =
-      new Comparator<GroupReference>() {
-        @Override
-        public int compare(GroupReference a, GroupReference b) {
-          return a.getName().compareTo(b.getName());
-        }
-      };
+      comparing(GroupReference::getName);
 
   /**
    * Runs {@link GroupBackend#suggest(String, ProjectState)} and filters the result to return the
diff --git a/java/com/google/gerrit/server/change/IncludedInResolver.java b/java/com/google/gerrit/server/change/IncludedInResolver.java
index d1bc0a27c7..afddf2a159 100644
--- a/java/com/google/gerrit/server/change/IncludedInResolver.java
+++ b/java/com/google/gerrit/server/change/IncludedInResolver.java
@@ -14,6 +14,9 @@
 
 package com.google.gerrit.server.change;
 
+import static java.util.Comparator.comparing;
+import static java.util.stream.Collectors.toList;
+
 import com.google.common.collect.LinkedListMultimap;
 import com.google.common.collect.ListMultimap;
 import com.google.common.collect.Lists;
@@ -22,7 +25,6 @@ import java.io.IOException;
 import java.util.ArrayList;
 import java.util.Collection;
 import java.util.Collections;
-import java.util.Comparator;
 import java.util.HashSet;
 import java.util.List;
 import java.util.Set;
@@ -151,15 +153,7 @@ public class IncludedInResolver {
    */
   private void partition(List<RevCommit> before, List<RevCommit> after) {
     int insertionPoint =
-        Collections.binarySearch(
-            tipsByCommitTime,
-            target,
-            new Comparator<RevCommit>() {
-              @Override
-              public int compare(RevCommit c1, RevCommit c2) {
-                return c1.getCommitTime() - c2.getCommitTime();
-              }
-            });
+        Collections.binarySearch(tipsByCommitTime, target, comparing(RevCommit::getCommitTime));
     if (insertionPoint < 0) {
       insertionPoint = -(insertionPoint + 1);
     }
@@ -211,19 +205,8 @@ public class IncludedInResolver {
       }
       commitToRef.put(commit, ref.getName());
     }
-    tipsByCommitTime = Lists.newArrayList(commitToRef.keySet());
-    sortOlderFirst(tipsByCommitTime);
-  }
-
-  private void sortOlderFirst(List<RevCommit> tips) {
-    Collections.sort(
-        tips,
-        new Comparator<RevCommit>() {
-          @Override
-          public int compare(RevCommit c1, RevCommit c2) {
-            return c1.getCommitTime() - c2.getCommitTime();
-          }
-        });
+    tipsByCommitTime =
+        commitToRef.keySet().stream().sorted(comparing(RevCommit::getCommitTime)).collect(toList());
   }
 
   public static class Result {
diff --git a/java/com/google/gerrit/server/mime/MimeUtilFileTypeRegistry.java b/java/com/google/gerrit/server/mime/MimeUtilFileTypeRegistry.java
index eecf935a69..0e9a2b7e15 100644
--- a/java/com/google/gerrit/server/mime/MimeUtilFileTypeRegistry.java
+++ b/java/com/google/gerrit/server/mime/MimeUtilFileTypeRegistry.java
@@ -14,6 +14,8 @@
 
 package com.google.gerrit.server.mime;
 
+import static java.util.Comparator.comparing;
+
 import com.google.common.flogger.FluentLogger;
 import com.google.gerrit.server.config.GerritServerConfig;
 import com.google.inject.Inject;
@@ -22,12 +24,9 @@ import eu.medsea.mimeutil.MimeException;
 import eu.medsea.mimeutil.MimeType;
 import eu.medsea.mimeutil.MimeUtil2;
 import java.io.InputStream;
-import java.util.ArrayList;
 import java.util.Collection;
 import java.util.Collections;
-import java.util.Comparator;
 import java.util.HashSet;
-import java.util.List;
 import java.util.Set;
 import org.eclipse.jgit.lib.Config;
 
@@ -115,16 +114,7 @@ public class MimeUtilFileTypeRegistry implements FileTypeRegistry {
       return MimeUtil2.UNKNOWN_MIME_TYPE;
     }
 
-    final List<MimeType> types = new ArrayList<>(mimeTypes);
-    Collections.sort(
-        types,
-        new Comparator<MimeType>() {
-          @Override
-          public int compare(MimeType a, MimeType b) {
-            return getCorrectedMimeSpecificity(b) - getCorrectedMimeSpecificity(a);
-          }
-        });
-    return types.get(0);
+    return Collections.max(mimeTypes, comparing(this::getCorrectedMimeSpecificity));
   }
 
   @Override
diff --git a/java/com/google/gerrit/server/patch/PatchList.java b/java/com/google/gerrit/server/patch/PatchList.java
index cf5df4af52..dd717ba37e 100644
--- a/java/com/google/gerrit/server/patch/PatchList.java
+++ b/java/com/google/gerrit/server/patch/PatchList.java
@@ -47,12 +47,7 @@ public class PatchList implements Serializable {
   private static final long serialVersionUID = PatchListKey.serialVersionUID;
 
   private static final Comparator<PatchListEntry> PATCH_CMP =
-      new Comparator<PatchListEntry>() {
-        @Override
-        public int compare(PatchListEntry a, PatchListEntry b) {
-          return comparePaths(a.getNewName(), b.getNewName());
-        }
-      };
+      Comparator.comparing(PatchListEntry::getNewName, PatchList::comparePaths);
 
   @VisibleForTesting
   static int comparePaths(String a, String b) {
diff --git a/java/com/google/gerrit/server/patch/PatchScriptBuilder.java b/java/com/google/gerrit/server/patch/PatchScriptBuilder.java
index a3d9048f52..e94f7e83d4 100644
--- a/java/com/google/gerrit/server/patch/PatchScriptBuilder.java
+++ b/java/com/google/gerrit/server/patch/PatchScriptBuilder.java
@@ -15,6 +15,7 @@
 package com.google.gerrit.server.patch;
 
 import static java.nio.charset.StandardCharsets.UTF_8;
+import static java.util.Comparator.comparing;
 
 import com.google.common.collect.ImmutableSet;
 import com.google.gerrit.common.data.CommentDetail;
@@ -55,13 +56,7 @@ class PatchScriptBuilder {
   static final int MAX_CONTEXT = 5000000;
   static final int BIG_FILE = 9000;
 
-  private static final Comparator<Edit> EDIT_SORT =
-      new Comparator<Edit>() {
-        @Override
-        public int compare(Edit o1, Edit o2) {
-          return o1.getBeginA() - o2.getBeginA();
-        }
-      };
+  private static final Comparator<Edit> EDIT_SORT = comparing(Edit::getBeginA);
 
   private Repository db;
   private Project.NameKey projectKey;
diff --git a/java/com/google/gerrit/server/plugins/PluginEntry.java b/java/com/google/gerrit/server/plugins/PluginEntry.java
index f7b1e82af3..3a6c7b2c17 100644
--- a/java/com/google/gerrit/server/plugins/PluginEntry.java
+++ b/java/com/google/gerrit/server/plugins/PluginEntry.java
@@ -14,6 +14,8 @@
 
 package com.google.gerrit.server.plugins;
 
+import static java.util.Comparator.comparing;
+
 import java.util.Collections;
 import java.util.Comparator;
 import java.util.Map;
@@ -28,13 +30,7 @@ import java.util.Optional;
 public class PluginEntry {
   public static final String ATTR_CHARACTER_ENCODING = "Character-Encoding";
   public static final String ATTR_CONTENT_TYPE = "Content-Type";
-  public static final Comparator<PluginEntry> COMPARATOR_BY_NAME =
-      new Comparator<PluginEntry>() {
-        @Override
-        public int compare(PluginEntry a, PluginEntry b) {
-          return a.getName().compareTo(b.getName());
-        }
-      };
+  public static final Comparator<PluginEntry> COMPARATOR_BY_NAME = comparing(PluginEntry::getName);
 
   private static final Map<Object, String> EMPTY_ATTRS = Collections.emptyMap();
   private static final Optional<Long> NO_SIZE = Optional.empty();
diff --git a/java/com/google/gerrit/server/restapi/account/GetEmails.java b/java/com/google/gerrit/server/restapi/account/GetEmails.java
index 85262eeb72..ed3347fc97 100644
--- a/java/com/google/gerrit/server/restapi/account/GetEmails.java
+++ b/java/com/google/gerrit/server/restapi/account/GetEmails.java
@@ -14,6 +14,9 @@
 
 package com.google.gerrit.server.restapi.account;
 
+import static java.util.Comparator.comparing;
+import static java.util.stream.Collectors.toList;
+
 import com.google.gerrit.extensions.common.EmailInfo;
 import com.google.gerrit.extensions.restapi.AuthException;
 import com.google.gerrit.extensions.restapi.RestReadView;
@@ -25,10 +28,8 @@ import com.google.gerrit.server.permissions.PermissionBackendException;
 import com.google.inject.Inject;
 import com.google.inject.Provider;
 import com.google.inject.Singleton;
-import java.util.ArrayList;
-import java.util.Collections;
-import java.util.Comparator;
 import java.util.List;
+import java.util.Objects;
 
 @Singleton
 public class GetEmails implements RestReadView<AccountResource> {
@@ -47,24 +48,19 @@ public class GetEmails implements RestReadView<AccountResource> {
     if (!self.get().hasSameAccountId(rsrc.getUser())) {
       permissionBackend.currentUser().check(GlobalPermission.MODIFY_ACCOUNT);
     }
+    return rsrc.getUser()
+        .getEmailAddresses()
+        .stream()
+        .filter(Objects::nonNull)
+        .map(e -> toEmailInfo(rsrc, e))
+        .sorted(comparing((EmailInfo e) -> e.email))
+        .collect(toList());
+  }
 
-    List<EmailInfo> emails = new ArrayList<>();
-    for (String email : rsrc.getUser().getEmailAddresses()) {
-      if (email != null) {
-        EmailInfo e = new EmailInfo();
-        e.email = email;
-        e.preferred(rsrc.getUser().getAccount().getPreferredEmail());
-        emails.add(e);
-      }
-    }
-    Collections.sort(
-        emails,
-        new Comparator<EmailInfo>() {
-          @Override
-          public int compare(EmailInfo a, EmailInfo b) {
-            return a.email.compareTo(b.email);
-          }
-        });
-    return emails;
+  private static EmailInfo toEmailInfo(AccountResource rsrc, String email) {
+    EmailInfo e = new EmailInfo();
+    e.email = email;
+    e.preferred(rsrc.getUser().getAccount().getPreferredEmail());
+    return e;
   }
 }
diff --git a/java/com/google/gerrit/server/restapi/account/GetWatchedProjects.java b/java/com/google/gerrit/server/restapi/account/GetWatchedProjects.java
index 112bb246b4..61021be73c 100644
--- a/java/com/google/gerrit/server/restapi/account/GetWatchedProjects.java
+++ b/java/com/google/gerrit/server/restapi/account/GetWatchedProjects.java
@@ -14,8 +14,10 @@
 
 package com.google.gerrit.server.restapi.account;
 
+import static java.util.Comparator.comparing;
+import static java.util.stream.Collectors.toList;
+
 import com.google.common.base.Strings;
-import com.google.common.collect.ComparisonChain;
 import com.google.common.collect.ImmutableSet;
 import com.google.gerrit.extensions.client.ProjectWatchInfo;
 import com.google.gerrit.extensions.restapi.AuthException;
@@ -36,11 +38,7 @@ import com.google.inject.Inject;
 import com.google.inject.Provider;
 import com.google.inject.Singleton;
 import java.io.IOException;
-import java.util.ArrayList;
-import java.util.Collections;
-import java.util.Comparator;
 import java.util.List;
-import java.util.Map;
 import org.eclipse.jgit.errors.ConfigInvalidException;
 
 @Singleton
@@ -67,31 +65,28 @@ public class GetWatchedProjects implements RestReadView<AccountResource> {
 
     Account.Id accountId = rsrc.getUser().getAccountId();
     AccountState account = accounts.get(accountId).orElseThrow(ResourceNotFoundException::new);
-    List<ProjectWatchInfo> projectWatchInfos = new ArrayList<>();
-    for (Map.Entry<ProjectWatchKey, ImmutableSet<NotifyType>> e :
-        account.getProjectWatches().entrySet()) {
-      ProjectWatchInfo pwi = new ProjectWatchInfo();
-      pwi.filter = e.getKey().filter();
-      pwi.project = e.getKey().project().get();
-      pwi.notifyAbandonedChanges = toBoolean(e.getValue().contains(NotifyType.ABANDONED_CHANGES));
-      pwi.notifyNewChanges = toBoolean(e.getValue().contains(NotifyType.NEW_CHANGES));
-      pwi.notifyNewPatchSets = toBoolean(e.getValue().contains(NotifyType.NEW_PATCHSETS));
-      pwi.notifySubmittedChanges = toBoolean(e.getValue().contains(NotifyType.SUBMITTED_CHANGES));
-      pwi.notifyAllComments = toBoolean(e.getValue().contains(NotifyType.ALL_COMMENTS));
-      projectWatchInfos.add(pwi);
-    }
-    Collections.sort(
-        projectWatchInfos,
-        new Comparator<ProjectWatchInfo>() {
-          @Override
-          public int compare(ProjectWatchInfo pwi1, ProjectWatchInfo pwi2) {
-            return ComparisonChain.start()
-                .compare(pwi1.project, pwi2.project)
-                .compare(Strings.nullToEmpty(pwi1.filter), Strings.nullToEmpty(pwi2.filter))
-                .result();
-          }
-        });
-    return projectWatchInfos;
+    return account
+        .getProjectWatches()
+        .entrySet()
+        .stream()
+        .map(e -> toProjectWatchInfo(e.getKey(), e.getValue()))
+        .sorted(
+            comparing((ProjectWatchInfo pwi) -> pwi.project)
+                .thenComparing(pwi -> Strings.nullToEmpty(pwi.filter)))
+        .collect(toList());
+  }
+
+  private static ProjectWatchInfo toProjectWatchInfo(
+      ProjectWatchKey key, ImmutableSet<NotifyType> watchTypes) {
+    ProjectWatchInfo pwi = new ProjectWatchInfo();
+    pwi.filter = key.filter();
+    pwi.project = key.project().get();
+    pwi.notifyAbandonedChanges = toBoolean(watchTypes.contains(NotifyType.ABANDONED_CHANGES));
+    pwi.notifyNewChanges = toBoolean(watchTypes.contains(NotifyType.NEW_CHANGES));
+    pwi.notifyNewPatchSets = toBoolean(watchTypes.contains(NotifyType.NEW_PATCHSETS));
+    pwi.notifySubmittedChanges = toBoolean(watchTypes.contains(NotifyType.SUBMITTED_CHANGES));
+    pwi.notifyAllComments = toBoolean(watchTypes.contains(NotifyType.ALL_COMMENTS));
+    return pwi;
   }
 
   private static Boolean toBoolean(boolean value) {
diff --git a/java/com/google/gerrit/server/restapi/config/ListTasks.java b/java/com/google/gerrit/server/restapi/config/ListTasks.java
index 7b69831124..f77cda4a59 100644
--- a/java/com/google/gerrit/server/restapi/config/ListTasks.java
+++ b/java/com/google/gerrit/server/restapi/config/ListTasks.java
@@ -14,7 +14,9 @@
 
 package com.google.gerrit.server.restapi.config;
 
-import com.google.common.collect.ComparisonChain;
+import static java.util.Comparator.comparing;
+import static java.util.stream.Collectors.toList;
+
 import com.google.gerrit.extensions.restapi.AuthException;
 import com.google.gerrit.extensions.restapi.RestReadView;
 import com.google.gerrit.reviewdb.client.Project;
@@ -35,8 +37,6 @@ import com.google.inject.Provider;
 import com.google.inject.Singleton;
 import java.sql.Timestamp;
 import java.util.ArrayList;
-import java.util.Collections;
-import java.util.Comparator;
 import java.util.HashMap;
 import java.util.List;
 import java.util.Map;
@@ -106,20 +106,14 @@ public class ListTasks implements RestReadView<ConfigResource> {
   }
 
   private List<TaskInfo> getTasks() {
-    List<TaskInfo> taskInfos = workQueue.getTaskInfos(TaskInfo::new);
-    Collections.sort(
-        taskInfos,
-        new Comparator<TaskInfo>() {
-          @Override
-          public int compare(TaskInfo a, TaskInfo b) {
-            return ComparisonChain.start()
-                .compare(a.state.ordinal(), b.state.ordinal())
-                .compare(a.delay, b.delay)
-                .compare(a.command, b.command)
-                .result();
-          }
-        });
-    return taskInfos;
+    return workQueue
+        .getTaskInfos(TaskInfo::new)
+        .stream()
+        .sorted(
+            comparing((TaskInfo t) -> t.state.ordinal())
+                .thenComparing(t -> t.delay)
+                .thenComparing(t -> t.command))
+        .collect(toList());
   }
 
   public static class TaskInfo {
diff --git a/java/com/google/gerrit/server/restapi/group/ListSubgroups.java b/java/com/google/gerrit/server/restapi/group/ListSubgroups.java
index 97a260e9bd..26b6db4567 100644
--- a/java/com/google/gerrit/server/restapi/group/ListSubgroups.java
+++ b/java/com/google/gerrit/server/restapi/group/ListSubgroups.java
@@ -15,6 +15,7 @@
 package com.google.gerrit.server.restapi.group;
 
 import static com.google.common.base.Strings.nullToEmpty;
+import static java.util.Comparator.comparing;
 
 import com.google.common.flogger.FluentLogger;
 import com.google.gerrit.common.data.GroupDescription;
@@ -30,7 +31,6 @@ import com.google.inject.Inject;
 import com.google.inject.Singleton;
 import java.util.ArrayList;
 import java.util.Collections;
-import java.util.Comparator;
 import java.util.List;
 
 @Singleton
@@ -74,16 +74,7 @@ public class ListSubgroups implements RestReadView<GroupResource> {
     }
     Collections.sort(
         included,
-        new Comparator<GroupInfo>() {
-          @Override
-          public int compare(GroupInfo a, GroupInfo b) {
-            int cmp = nullToEmpty(a.name).compareTo(nullToEmpty(b.name));
-            if (cmp != 0) {
-              return cmp;
-            }
-            return nullToEmpty(a.id).compareTo(nullToEmpty(b.id));
-          }
-        });
+        comparing((GroupInfo g) -> nullToEmpty(g.name)).thenComparing(g -> nullToEmpty(g.id)));
     return included;
   }
 }
diff --git a/java/com/google/gerrit/server/restapi/project/ListTags.java b/java/com/google/gerrit/server/restapi/project/ListTags.java
index e79fdcaa8d..578fbf36c2 100644
--- a/java/com/google/gerrit/server/restapi/project/ListTags.java
+++ b/java/com/google/gerrit/server/restapi/project/ListTags.java
@@ -15,6 +15,7 @@
 package com.google.gerrit.server.restapi.project;
 
 import static com.google.gerrit.reviewdb.client.RefNames.isConfigRef;
+import static java.util.Comparator.comparing;
 
 import com.google.common.collect.ImmutableMap;
 import com.google.gerrit.extensions.api.projects.ProjectApi.ListRefsRequest;
@@ -40,7 +41,6 @@ import java.io.IOException;
 import java.sql.Timestamp;
 import java.util.ArrayList;
 import java.util.Collections;
-import java.util.Comparator;
 import java.util.List;
 import java.util.Map;
 import org.eclipse.jgit.errors.RepositoryNotFoundException;
@@ -135,14 +135,7 @@ public class ListTags implements RestReadView<ProjectResource> {
       }
     }
 
-    Collections.sort(
-        tags,
-        new Comparator<TagInfo>() {
-          @Override
-          public int compare(TagInfo a, TagInfo b) {
-            return a.ref.compareTo(b.ref);
-          }
-        });
+    Collections.sort(tags, comparing(t -> t.ref));
 
     return new RefFilter<TagInfo>(Constants.R_TAGS)
         .start(start)
diff --git a/java/com/google/gwtexpui/globalkey/client/KeyHelpPopup.java b/java/com/google/gwtexpui/globalkey/client/KeyHelpPopup.java
index 13181250df..20d093e31e 100644
--- a/java/com/google/gwtexpui/globalkey/client/KeyHelpPopup.java
+++ b/java/com/google/gwtexpui/globalkey/client/KeyHelpPopup.java
@@ -14,6 +14,9 @@
 
 package com.google.gwtexpui.globalkey.client;
 
+import static java.util.Comparator.comparing;
+import static java.util.stream.Collectors.toList;
+
 import com.google.gwt.event.dom.client.ClickEvent;
 import com.google.gwt.event.dom.client.ClickHandler;
 import com.google.gwt.event.dom.client.KeyCodes;
@@ -31,10 +34,7 @@ import com.google.gwt.user.client.ui.HasHorizontalAlignment;
 import com.google.gwt.user.client.ui.PopupPanel;
 import com.google.gwtexpui.safehtml.client.SafeHtml;
 import com.google.gwtexpui.safehtml.client.SafeHtmlBuilder;
-import java.util.ArrayList;
 import java.util.Collection;
-import java.util.Collections;
-import java.util.Comparator;
 import java.util.HashMap;
 import java.util.LinkedHashMap;
 import java.util.List;
@@ -228,15 +228,6 @@ public class KeyHelpPopup extends PopupPanel implements KeyPressHandler, KeyDown
   }
 
   private List<KeyCommand> sort(KeyCommandSet set) {
-    final List<KeyCommand> keys = new ArrayList<>(set.getKeys());
-    Collections.sort(
-        keys,
-        new Comparator<KeyCommand>() {
-          @Override
-          public int compare(KeyCommand arg0, KeyCommand arg1) {
-            return arg0.getHelpText().compareTo(arg1.getHelpText());
-          }
-        });
-    return keys;
+    return set.getKeys().stream().sorted(comparing(KeyCommand::getHelpText)).collect(toList());
   }
 }
diff --git a/java/com/google/gwtexpui/safehtml/client/HighlightSuggestOracle.java b/java/com/google/gwtexpui/safehtml/client/HighlightSuggestOracle.java
index ef80cdb01b..758521fc0b 100644
--- a/java/com/google/gwtexpui/safehtml/client/HighlightSuggestOracle.java
+++ b/java/com/google/gwtexpui/safehtml/client/HighlightSuggestOracle.java
@@ -14,11 +14,12 @@
 
 package com.google.gwtexpui.safehtml.client;
 
+import static java.util.Comparator.comparing;
+import static java.util.stream.Collectors.toList;
+
 import com.google.gwt.user.client.ui.SuggestOracle;
 import java.util.ArrayList;
 import java.util.Arrays;
-import java.util.Collections;
-import java.util.Comparator;
 import java.util.List;
 
 /**
@@ -115,15 +116,8 @@ public abstract class HighlightSuggestOracle extends SuggestOracle {
      * terms.
      */
     private static List<String> splitQuery(String query) {
-      List<String> queryTerms = Arrays.asList(query.split("\\s+"));
-      Collections.sort(
-          queryTerms,
-          new Comparator<String>() {
-            @Override
-            public int compare(String s1, String s2) {
-              return Integer.compare(s2.length(), s1.length());
-            }
-          });
+      List<String> queryTerms =
+          Arrays.stream(query.split("\\s+")).sorted(comparing(String::length)).collect(toList());
 
       List<String> result = new ArrayList<>();
       for (String s : queryTerms) {