ZipCoinRedIonicClient/src/pages/home/home.ts

   
   constructor(public navCtrl: NavController, public blockService: BlockService) {
       this.getAllBlocks();
-    }
+  }
 
   getBlock(id) {
     this.blockService.getBlock(id).subscribe(block => {
   getMinedBlock(id) {
     this.blockService.getMinedBlock(id).subscribe(minedBlock => {
       this.block = minedBlock;
-  })
+    })
   }
 }
 

ZipCoinRedJavaServer/src/main/java/com/zipcoin/service/BlockService.java

         if (blockToMine.isPresent()) {
             Miner miner = new Miner();
             Block minedBlock = miner.mine(blockToMine.get());
-            return blockRepository.saveAndFlush(minedBlock);
+            return blockRepository.save(minedBlock);
         } else {
             return null;
         }