initial functionality complete, NMS v1_12_R1

.gitignore

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+out/
+.idea/
+UnbreakableSpawners.iml

src/com/gmail/profanedbane/UnbreakableSpawners/UnbreakableSpawners.java

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+package com.gmail.profanedbane.UnbreakableSpawners;
+
+import net.minecraft.server.v1_12_R1.Block;
+import org.bukkit.plugin.java.JavaPlugin;
+
+import java.lang.reflect.Field;
+
+// overrides mob spawners to be bedrock tier
+public class UnbreakableSpawners extends JavaPlugin {
+
+    // store old field values to revert to on stop
+    private Block spawner = Block.getByName("mob_spawner");
+    private Field durability;
+    private Field strength;
+    private float oldDurability;
+    private float oldStrength;
+
+    @Override
+    public void onLoad(){
+        try {
+            durability = Block.class.getDeclaredField("durability");
+            strength = Block.class.getDeclaredField("strength");
+            durability.setAccessible(true);
+            strength.setAccessible(true);
+
+            oldDurability = durability.getFloat(spawner);
+            oldStrength = strength.getFloat(spawner);
+
+            durability.set(spawner, 3600000f);
+            strength.set(spawner, -1f);
+
+        } catch (NoSuchFieldException | IllegalAccessException e) {
+            e.printStackTrace();
+        }
+    }
+
+    // apparantly best practice is to revert on stop
+    @Override
+    public void onDisable(){
+        try {
+            durability.set(spawner, oldDurability);
+            strength.set(spawner, oldStrength);
+
+        } catch (IllegalAccessException e) {
+            e.printStackTrace();
+        }
+    }
+}
+

src/plugin.yml

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+name: UnbreakableSpawners
+version: 1.0.0
+author: ProfanedBane
+main: com.gmail.profanedbane.UnbreakableSpawners.UnbreakableSpawners
+description: NMS override to make mob spawners as strong as bedrock.