Don't validate unloaded signs in startup

pom.xml

@@ -66,7 +66,7 @@
         <!-- Do not change unless you want different name for local builds. -->
         <build.number>-LOCAL</build.number>
         <!-- This allows to change between versions. -->
-        <build.version>1.10.0</build.version>
+        <build.version>1.10.1</build.version>
     </properties>
 
     <!-- Profiles will allow to automatically change build version. -->

src/main/java/world/bentobox/warps/WarpSignsManager.java

@@ -186,7 +186,11 @@ public class WarpSignsManager {
             // Load into map
             if (warpsData != null) {
                 warpsData.getWarpSigns().forEach((k,v) -> {
-                    if (k != null && k.getWorld() != null && k.getBlock().getType().name().contains("SIGN")) {
+                    if (k != null && k.getWorld() != null) {
+                        if (k.getBlock().getChunk().isLoaded() && !k.getBlock().getType().name().contains("SIGN")) {
+                            return;
+                        }
+
                         // Add to map
                         getWarpMap(k.getWorld()).put(v, k);
                     }

src/main/java/world/bentobox/warps/listeners/WarpSignsListener.java

@@ -1,5 +1,6 @@
 package world.bentobox.warps.listeners;
 
+import java.util.Iterator;
 import java.util.Map;
 import java.util.UUID;
 
@@ -16,6 +17,7 @@ import org.bukkit.event.Listener;
 import org.bukkit.event.block.BlockBreakEvent;
 import org.bukkit.event.block.SignChangeEvent;
 
+import org.bukkit.event.world.ChunkLoadEvent;
 import world.bentobox.bentobox.BentoBox;
 import world.bentobox.bentobox.api.events.team.TeamEvent.TeamKickEvent;
 import world.bentobox.bentobox.api.events.team.TeamEvent.TeamLeaveEvent;
@@ -44,6 +46,26 @@ public class WarpSignsListener implements Listener {
         this.plugin = addon.getPlugin();
     }
 
+    @EventHandler(priority = EventPriority.NORMAL)
+    public void onChunkLoad(ChunkLoadEvent event) {
+        boolean changed = false;
+        Iterator<Map.Entry<UUID, Location>> iterator =
+                addon.getWarpSignsManager().getWarpMap(event.getWorld()).entrySet().iterator();
+        while (iterator.hasNext()) {
+            Map.Entry<UUID, Location> entry = iterator.next();
+            if (entry.getValue().getChunk().equals(event.getChunk())
+                    && !entry.getValue().getBlock().getType().name().contains("SIGN")) {
+                iterator.remove();
+                // Remove sign from warp panel cache
+                addon.getWarpPanelManager().removeWarp(event.getWorld(), entry.getKey());
+                changed = true;
+            }
+        }
+        if (changed) {
+            addon.getWarpSignsManager().saveWarpList();
+        }
+    }
+
     @EventHandler(priority = EventPriority.NORMAL, ignoreCancelled = true)
     public void onPlayerLeave(TeamLeaveEvent e) {
         // Remove any warp signs from this game mode

src/test/java/world/bentobox/warps/WarpSignsManagerTest.java

@@ -20,13 +20,7 @@ import java.util.Map;
 import java.util.UUID;
 import java.util.logging.Logger;
 
-import org.bukkit.Bukkit;
+import org.bukkit.*;
-import org.bukkit.ChatColor;
-import org.bukkit.Location;
-import org.bukkit.Material;
-import org.bukkit.OfflinePlayer;
-import org.bukkit.Server;
-import org.bukkit.World;
 import org.bukkit.World.Environment;
 import org.bukkit.block.Block;
 import org.bukkit.block.BlockFace;
@@ -90,6 +84,8 @@ public class WarpSignsManagerTest {
     @Mock
     private Location location;
     @Mock
+    private Chunk chunk;
+    @Mock
     private Block block;
     @Mock
     private PluginManager pim;
@@ -166,9 +162,13 @@ public class WarpSignsManagerTest {
         when(location.getBlockZ()).thenReturn(25);
         when(world.getEnvironment()).thenReturn(Environment.NORMAL);
 
+        // Chunk
+        when(chunk.isLoaded()).thenReturn(true);
+
         // Block
         when(block.getType()).thenReturn(Material.ACACIA_SIGN);
         when(block.getLocation()).thenReturn(location);
+        when(block.getChunk()).thenReturn(chunk);
         Sign sign = mock(Sign.class);
         String[] lines = {"[Welcome]", "line2", "line3", "line4"};
         when(sign.getLines()).thenReturn(lines);