exception in transaction, how to rollback all put?

[bingili]

In the code, tx.commit() is not reached. Is there a way to rollback the
cache.put("test1", "1"); cache.put("test2", "2");

        

            public IgniteTest() {
                CacheConfiguration cacheCfg = new CacheConfiguration();
                cacheCfg.setName("cacheName");
                cacheCfg.setAtomicityMode(CacheAtomicityMode.TRANSACTIONAL);

                IgniteConfiguration cfg = new IgniteConfiguration();
                cfg.setCacheConfiguration(cacheCfg);
                
                TransactionConfiguration txCfg = new TransactionConfiguration();
                cfg.setTransactionConfiguration(txCfg);
                
                cfg.setClientMode(true);
                Ignite ignite = Ignition.start(cfg);
                transactions = ignite.transactions();
                cache = ignite.getOrCreateCache("txn test cache");
        }
        
        public void run() {
                Transaction tx = 
transactions.txStart(TransactionConcurrency.OPTIMISTIC,
                TransactionIsolation.SERIALIZABLE);
                try{
                          
                    cache.put("test1", "1");
                    cache.put("test2", "2");
                    
                    String[] bug = null;
                    bug[0] = "hello";
                    
                    cache.put("test3", "3");
                    System.out.println("tx.commit");
                    tx.commit();
                }catch (Exception ex) {
                        ex.printStackTrace();
                        System.out.println("tx.rollback");
                        tx.rollback();
                }
        }



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