Lets make this work with MySQL.

src/main/java/com/songoda/ultimatestacker/database/migrations/_2_EntityStacks.java

@@ -32,7 +32,7 @@ public class _2_EntityStacks extends DataMigration {
             statement.execute("CREATE TABLE " + tablePrefix + "stacked_entities (" +
                     "uuid VARCHAR(36) PRIMARY KEY NOT NULL," +
                     "host INTEGER NOT NULL," +
-                    "serialized_entity VARBINARY NOT NULL" +
+                    "serialized_entity VARBINARY(255) NOT NULL" +
                     ")");
         }
     }

src/main/java/com/songoda/ultimatestacker/database/migrations/_3_BlockStacks.java

@@ -23,7 +23,7 @@ public class _3_BlockStacks extends DataMigration {
             statement.execute("CREATE TABLE " + tablePrefix + "blocks (" +
                     "id INTEGER PRIMARY KEY" + autoIncrement + ", " +
                     "amount INTEGER NOT NULL," +
-                    "material STRING NOT NULL," +
+                    "material TEXT NOT NULL," +
                     "world TEXT NOT NULL, " +
                     "x DOUBLE NOT NULL, " +
                     "y DOUBLE NOT NULL, " +