Addresses: Catch a rare (Windows only? IPv6 only?) error

when enumerating network interfaces

core/java/src/net/i2p/util/Addresses.java

@@ -131,7 +131,15 @@ public abstract class Addresses {
                     }
                 }
             }
-        } catch (SocketException e) {}
+        } catch (SocketException e) {
+        } catch (java.lang.Error e) {
+            // Windows, possibly when IPv6 only...
+            // https://bugs.openjdk.java.net/browse/JDK-8046500
+            // java.lang.Error: IP Helper Library GetIfTable function failed
+            //   at java.net.NetworkInterface.getAll(Native Method)
+            //   at java.net.NetworkInterface.getNetworkInterfaces(Unknown Source)
+            //   at net.i2p.util.Addresses.getAddresses ...
+        }
 
         if (includeLoopbackAndWildcard) {
             if (haveIPv4)

router/java/src/net/i2p/router/transport/udp/MTU.java

@@ -40,6 +40,14 @@ abstract class MTU {
             ifcs = NetworkInterface.getNetworkInterfaces();
         } catch (SocketException se) {
             return 0;
+        } catch (java.lang.Error e) {
+            // Windows, possibly when IPv6 only...
+            // https://bugs.openjdk.java.net/browse/JDK-8046500
+            // java.lang.Error: IP Helper Library GetIfTable function failed
+            //   at java.net.NetworkInterface.getAll(Native Method)
+            //   at java.net.NetworkInterface.getNetworkInterfaces(Unknown Source)
+            //   at net.i2p.util.Addresses.getAddresses ...
+            return 0;
         }
         if (ifcs != null) {
             while (ifcs.hasMoreElements()) {