Use diamond operator.

src/main/java/org/torproject/onionoo/docs/DetailsDocument.java

@@ -76,7 +76,7 @@ public class DetailsDocument extends Document {
   }
 
   public List<String> getExitAddresses() {
-    return this.exitAddresses == null ? new ArrayList<String>()
+    return this.exitAddresses == null ? new ArrayList<>()
         : this.exitAddresses;
   }
 

src/main/java/org/torproject/onionoo/docs/DetailsStatus.java

@@ -248,7 +248,7 @@ public class DetailsStatus extends Document {
   }
 
   public SortedSet<String> getOrAddressesAndPorts() {
-    return this.orAddressesAndPorts == null ? new TreeSet<String>() :
+    return this.orAddressesAndPorts == null ? new TreeSet<>() :
         this.orAddressesAndPorts;
   }
 

src/main/java/org/torproject/onionoo/docs/NodeStatus.java

@@ -182,7 +182,7 @@ public class NodeStatus extends Document {
   }
 
   public SortedSet<String> getOrAddressesAndPorts() {
-    return this.orAddressesAndPorts == null ? new TreeSet<String>()
+    return this.orAddressesAndPorts == null ? new TreeSet<>()
         : this.orAddressesAndPorts;
   }
 

src/main/java/org/torproject/onionoo/server/NodeIndexer.java

@@ -211,7 +211,7 @@ public class NodeIndexer implements ServletContextListener, Runnable {
       }
       if (!newRelaysByCountryCode.containsKey(countryCode)) {
         newRelaysByCountryCode.put(countryCode,
-            new HashSet<String>());
+            new HashSet<>());
       }
       newRelaysByCountryCode.get(countryCode).add(fingerprint);
       newRelaysByCountryCode.get(countryCode).add(hashedFingerprint);
@@ -226,7 +226,7 @@ public class NodeIndexer implements ServletContextListener, Runnable {
         asNumber = "AS0";
       }
       if (!newRelaysByAsNumber.containsKey(asNumber)) {
-        newRelaysByAsNumber.put(asNumber, new HashSet<String>());
+        newRelaysByAsNumber.put(asNumber, new HashSet<>());
       }
       newRelaysByAsNumber.get(asNumber).add(fingerprint);
       newRelaysByAsNumber.get(asNumber).add(hashedFingerprint);
@@ -239,7 +239,7 @@ public class NodeIndexer implements ServletContextListener, Runnable {
       for (String flag : entry.getRelayFlags()) {
         String flagLowerCase = flag.toLowerCase();
         if (!newRelaysByFlag.containsKey(flagLowerCase)) {
-          newRelaysByFlag.put(flagLowerCase, new HashSet<String>());
+          newRelaysByFlag.put(flagLowerCase, new HashSet<>());
         }
         newRelaysByFlag.get(flagLowerCase).add(fingerprint);
         newRelaysByFlag.get(flagLowerCase).add(hashedFingerprint);
@@ -260,7 +260,7 @@ public class NodeIndexer implements ServletContextListener, Runnable {
           - entry.getFirstSeenMillis()) / ONE_DAY);
       if (!newRelaysByFirstSeenDays.containsKey(daysSinceFirstSeen)) {
         newRelaysByFirstSeenDays.put(daysSinceFirstSeen,
-            new HashSet<String>());
+            new HashSet<>());
       }
       newRelaysByFirstSeenDays.get(daysSinceFirstSeen).add(fingerprint);
       newRelaysByFirstSeenDays.get(daysSinceFirstSeen).add(
@@ -270,21 +270,21 @@ public class NodeIndexer implements ServletContextListener, Runnable {
           - entry.getLastSeenMillis()) / ONE_DAY);
       if (!newRelaysByLastSeenDays.containsKey(daysSinceLastSeen)) {
         newRelaysByLastSeenDays.put(daysSinceLastSeen,
-            new HashSet<String>());
+            new HashSet<>());
       }
       newRelaysByLastSeenDays.get(daysSinceLastSeen).add(fingerprint);
       newRelaysByLastSeenDays.get(daysSinceLastSeen).add(
           hashedFingerprint);
       String contact = entry.getContact();
       if (!newRelaysByContact.containsKey(contact)) {
-        newRelaysByContact.put(contact, new HashSet<String>());
+        newRelaysByContact.put(contact, new HashSet<>());
       }
       newRelaysByContact.get(contact).add(fingerprint);
       newRelaysByContact.get(contact).add(hashedFingerprint);
       String version = entry.getVersion();
       if (null != version) {
         if (!newRelaysByVersion.containsKey(version)) {
-          newRelaysByVersion.put(version, new HashSet<String>());
+          newRelaysByVersion.put(version, new HashSet<>());
         }
         newRelaysByVersion.get(version).add(fingerprint);
         newRelaysByVersion.get(version).add(hashedFingerprint);
@@ -347,7 +347,7 @@ public class NodeIndexer implements ServletContextListener, Runnable {
       for (String flag : entry.getRelayFlags()) {
         String flagLowerCase = flag.toLowerCase();
         if (!newBridgesByFlag.containsKey(flagLowerCase)) {
-          newBridgesByFlag.put(flagLowerCase, new HashSet<String>());
+          newBridgesByFlag.put(flagLowerCase, new HashSet<>());
         }
         newBridgesByFlag.get(flagLowerCase).add(hashedFingerprint);
         newBridgesByFlag.get(flagLowerCase).add(
@@ -358,7 +358,7 @@ public class NodeIndexer implements ServletContextListener, Runnable {
           - entry.getFirstSeenMillis()) / ONE_DAY);
       if (!newBridgesByFirstSeenDays.containsKey(daysSinceFirstSeen)) {
         newBridgesByFirstSeenDays.put(daysSinceFirstSeen,
-            new HashSet<String>());
+            new HashSet<>());
       }
       newBridgesByFirstSeenDays.get(daysSinceFirstSeen).add(
           hashedFingerprint);
@@ -369,7 +369,7 @@ public class NodeIndexer implements ServletContextListener, Runnable {
           - entry.getLastSeenMillis()) / ONE_DAY);
       if (!newBridgesByLastSeenDays.containsKey(daysSinceLastSeen)) {
         newBridgesByLastSeenDays.put(daysSinceLastSeen,
-            new HashSet<String>());
+            new HashSet<>());
       }
       newBridgesByLastSeenDays.get(daysSinceLastSeen).add(
           hashedFingerprint);

src/main/java/org/torproject/onionoo/updater/ClientsStatusUpdater.java

@@ -116,7 +116,7 @@ public class ClientsStatusUpdater implements DescriptorListener,
           responsesByTransport, responsesByVersion); 
       if (!this.newResponses.containsKey(hashedFingerprint)) {
         this.newResponses.put(hashedFingerprint,
-            new TreeSet<ClientsHistory>());
+            new TreeSet<>());
       }
       this.newResponses.get(hashedFingerprint).add(
           newResponseHistory);

src/main/java/org/torproject/onionoo/updater/DescriptorSource.java

@@ -83,7 +83,7 @@ public class DescriptorSource {
       DescriptorType descriptorType) {
     if (!this.descriptorListeners.containsKey(descriptorType)) {
       this.descriptorListeners.put(descriptorType,
-          new HashSet<DescriptorListener>());
+          new HashSet<>());
     }
     this.descriptorListeners.get(descriptorType).add(listener);
   }

src/main/java/org/torproject/onionoo/updater/NodeDetailsStatusUpdater.java

@@ -224,7 +224,7 @@ public class NodeDetailsStatusUpdater implements DescriptorListener,
           continue;
         }
         if (!this.exitListEntries.containsKey(fingerprint)) {
-          this.exitListEntries.put(fingerprint, new HashMap<String, Long>());
+          this.exitListEntries.put(fingerprint, new HashMap<>());
         }
         String exitAddress = exitAddressScanMillis.getKey();
         if (!this.exitListEntries.get(fingerprint).containsKey(

src/main/java/org/torproject/onionoo/updater/RdnsLookupRequest.java

@@ -91,7 +91,7 @@ class RdnsLookupRequest extends Thread {
     envProps.put(Context.INITIAL_CONTEXT_FACTORY,
         "com.sun.jndi.dns.DnsContextFactory");
     final DirContext dnsContext = new InitialDirContext(envProps);
-    Set<String> results = new TreeSet<String>();
+    Set<String> results = new TreeSet<>();
     Attributes dnsEntries =
         dnsContext.getAttributes(hostName, new String[] { type });
     if (dnsEntries != null) {

src/main/java/org/torproject/onionoo/updater/UptimeStatusUpdater.java

@@ -105,7 +105,7 @@ public class UptimeStatusUpdater implements DescriptorListener,
       String fingerprint = entry.getFingerprint();
       if (!this.newRunningRelays.containsKey(fingerprint)) {
         this.newRunningRelays.put(fingerprint,
-            new TreeMap<Long, Flags>());
+            new TreeMap<>());
       }
       this.newRunningRelays.get(fingerprint).put(dateHourMillis,
           new Flags(entry.getFlags()));
@@ -125,7 +125,7 @@ public class UptimeStatusUpdater implements DescriptorListener,
           / DateTimeHelper.ONE_HOUR) * DateTimeHelper.ONE_HOUR;
       for (String fingerprint : fingerprints) {
         if (!this.newRunningBridges.containsKey(fingerprint)) {
-          this.newRunningBridges.put(fingerprint, new TreeSet<Long>());
+          this.newRunningBridges.put(fingerprint, new TreeSet<>());
         }
         this.newRunningBridges.get(fingerprint).add(dateHourMillis);
       }

src/test/java/org/torproject/onionoo/docs/DummyDocumentStore.java

@@ -20,7 +20,7 @@ public class DummyDocumentStore extends DocumentStore {
   private <T extends Document> SortedMap<String, Document>
       getStoredDocumentsByClass(Class<T> documentType) {
     if (!this.storedDocuments.containsKey(documentType)) {
-      this.storedDocuments.put(documentType, new TreeMap<String, Document>());
+      this.storedDocuments.put(documentType, new TreeMap<>());
     }
     return this.storedDocuments.get(documentType);
   }

src/test/java/org/torproject/onionoo/server/ResourceServletTest.java

@@ -56,7 +56,7 @@ public class ResourceServletTest {
       this.requestUri = requestUri;
       this.queryString = queryString;
       this.parameterMap = parameterMap == null
-          ? new HashMap<String, String[]>() : parameterMap;
+          ? new HashMap<>() : parameterMap;
     }
 
     @Override
@@ -162,8 +162,8 @@ public class ResourceServletTest {
             "Running", "V2Dir", "Valid" })), 1140L, "us",
         DateTimeHelper.parse("2013-04-16 18:00:00"), "AS7922",
         "comcast cable communications, llc", null,
-        new TreeSet<String>(Arrays.asList(new String[] {
-            "000C5F55BD4814B917CC474BD537F1A3B33CCE2A" })),
+            new TreeSet<>(Arrays.asList(new String[]{
+                "000C5F55BD4814B917CC474BD537F1A3B33CCE2A"})),
         new TreeSet<>(Arrays.asList(new String[] {
             "000C5F55BD4814B917CC474BD537F1A3B33CCE2A" })), null, null,
         new TreeSet<>(Arrays.asList(
@@ -182,7 +182,7 @@ public class ResourceServletTest {
         "liberty global operations b.v.",
         "1024d/51e2a1c7 \"steven j. murdoch\" "
         + "<tor+steven.murdoch@cl.cam.ac.uk> <fb-token:5sr_k_zs2wm=>",
-        new TreeSet<String>(), new TreeSet<String>(), "0.2.3.24-rc-dev",
+            new TreeSet<>(), new TreeSet<>(), "0.2.3.24-rc-dev",
         "windows xp", null, null, false);
     this.relays.put("0025C136C1F3A9EEFE2AE3F918F03BFA21B5070B",
         relayTimMayTribute);
@@ -337,7 +337,7 @@ public class ResourceServletTest {
         String[] parameterParts = parameter.split("=");
         if (!parameterLists.containsKey(parameterParts[0])) {
           parameterLists.put(parameterParts[0],
-              new ArrayList<String>());
+              new ArrayList<>());
         }
         parameterLists.get(parameterParts[0]).add(parameterParts[1]);
       }

src/test/java/org/torproject/onionoo/updater/DummyDescriptorSource.java

@@ -32,7 +32,7 @@ public class DummyDescriptorSource extends DescriptorSource {
   private Set<Descriptor> getDescriptorsByType(
       DescriptorType descriptorType) {
     if (!this.descriptors.containsKey(descriptorType)) {
-      this.descriptors.put(descriptorType, new HashSet<Descriptor>());
+      this.descriptors.put(descriptorType, new HashSet<>());
     }
     return this.descriptors.get(descriptorType);
   }
@@ -45,7 +45,7 @@ public class DummyDescriptorSource extends DescriptorSource {
       DescriptorType descriptorType) {
     if (!this.descriptorListeners.containsKey(descriptorType)) {
       this.descriptorListeners.put(descriptorType,
-          new HashSet<DescriptorListener>());
+          new HashSet<>());
     }
     this.descriptorListeners.get(descriptorType).add(listener);
   }

src/test/java/org/torproject/onionoo/updater/LookupServiceTest.java

@@ -234,19 +234,19 @@ public class LookupServiceTest {
 
   @Test()
   public void testLookupNoBlocksLines() {
-    this.assertLookupResult(new ArrayList<String>(), null, null,
+    this.assertLookupResult(new ArrayList<>(), null, null,
         "8.8.8.8", null, null, null, null, null, null, null, null);
   }
 
   @Test()
   public void testLookupNoLocationLines() {
-    this.assertLookupResult(null, new ArrayList<String>(), null,
+    this.assertLookupResult(null, new ArrayList<>(), null,
         "8.8.8.8", null, null, null, null, null, null, null, null);
   }
 
   @Test()
   public void testLookupNoGeoipAsNum2Lines() {
-    this.assertLookupResult(null, null, new ArrayList<String>(),
+    this.assertLookupResult(null, null, new ArrayList<>(),
         "8.8.8.8", null, null, null, null, null, null, null, null);
   }