chore: add annotations to suppress IDE warnings

* Add location not null check
The issue lies within the equals implementation

* Fix setposition method with default value.
Also add a comment too.

---------

Co-authored-by: OneLiteFeather <seelenretterin@onelitefeather.net>

Bukkit/src/main/java/com/plotsquared/bukkit/util/fawe/FaweRegionManager.java

@@ -37,7 +37,9 @@ import com.sk89q.worldedit.regions.CuboidRegion;
 import com.sk89q.worldedit.world.biome.BiomeType;
 import org.checkerframework.checker.nullness.qual.NonNull;
 import org.checkerframework.checker.nullness.qual.Nullable;
+import org.jetbrains.annotations.NotNull;
 
+import java.util.Objects;
 import java.util.Set;
 
 public class FaweRegionManager extends BukkitRegionManager {
@@ -59,7 +61,10 @@ public class FaweRegionManager extends BukkitRegionManager {
             @Nullable PlotPlayer<?> actor,
             @Nullable QueueCoordinator queue
     ) {
-        return delegate.setCuboids(area, regions, blocks, minY, maxY, queue.getCompleteTask());
+        return delegate.setCuboids(
+                area, regions, blocks, minY, maxY,
+                Objects.requireNonNullElseGet(queue, area::getQueue).getCompleteTask()
+        );
     }
 
     @Override
@@ -111,7 +116,7 @@ public class FaweRegionManager extends BukkitRegionManager {
     }
 
     @Override
-    public boolean regenerateRegion(final Location pos1, final Location pos2, boolean ignore, final Runnable whenDone) {
+    public boolean regenerateRegion(final @NotNull Location pos1, final @NotNull Location pos2, boolean ignore, final Runnable whenDone) {
         return delegate.regenerateRegion(pos1, pos2, ignore, whenDone);
     }
 

Core/src/main/java/com/plotsquared/core/database/SQLManager.java

@@ -2401,7 +2401,8 @@ public class SQLManager implements AbstractDB {
         addPlotTask(plot, new UniqueStatement("setPosition") {
             @Override
             public void set(PreparedStatement statement) throws SQLException {
-                statement.setString(1, position == null ? "" : position);
+                // Please see the table creation statement. There is the default value of "default"
+                statement.setString(1, position == null ? "DEFAULT" : position);
                 statement.setInt(2, getId(plot));
             }
 

Core/src/main/java/com/plotsquared/core/plot/Plot.java

@@ -1483,7 +1483,7 @@ public class Plot {
      */
     public void setHome(BlockLoc location) {
         Plot plot = this.getBasePlot(false);
-        if (BlockLoc.ZERO.equals(location) || BlockLoc.MINY.equals(location)) {
+        if (location != null && (BlockLoc.ZERO.equals(location) || BlockLoc.MINY.equals(location))) {
             return;
         }
         plot.getSettings().setPosition(location);