#vulnerable code 
                                @Test
    public void moduleThrowingInitExceptionShouldBeMarkedForReinitializationOnlyTheFirstTime() throws InterruptedException {
        final TxDrivenModule mockModule = createMockModule();
        when(mockModule.getConfiguration()).thenReturn(NullTxDrivenModuleConfiguration.getInstance());
        doThrow(new NeedsInitializationException()).when(mockModule).beforeCommit(any(ImprovedTransactionData.class));

        GraphAwareRuntime runtime = GraphAwareRuntimeFactory.createRuntime(database);
        runtime.registerModule(mockModule);

        runtime.start();

        try (Transaction tx = database.beginTx()) {
            database.createNode();
            tx.success();
        }

        long firstFailureTimestamp;
        try (Transaction tx = database.beginTx()) {
            firstFailureTimestamp = Long.valueOf(getRuntimeRoot().getProperty(GA_PREFIX + RUNTIME + "_" + MOCK).toString().replaceFirst(FORCE_INITIALIZATION, ""));
        }

        Thread.sleep(1);

        try (Transaction tx = database.beginTx()) {
            database.createNode();
            tx.success();
        }

        long secondFailureTimestamp;
        try (Transaction tx = database.beginTx()) {
            secondFailureTimestamp = Long.valueOf(getRuntimeRoot().getProperty(GA_PREFIX + RUNTIME + "_" + MOCK).toString().replaceFirst(FORCE_INITIALIZATION, ""));
        }

        assertEquals(firstFailureTimestamp, secondFailureTimestamp);
    } 
                            #location 19 
                            #vulnerability type NULL_DEREFERENCE
#fixed code
                                @Test
    public void moduleThrowingInitExceptionShouldBeMarkedForReinitializationOnlyTheFirstTime() throws InterruptedException {
        final TxDrivenModule mockModule = createMockModule();
        when(mockModule.getConfiguration()).thenReturn(NullTxDrivenModuleConfiguration.getInstance());
        doThrow(new NeedsInitializationException()).when(mockModule).beforeCommit(any(ImprovedTransactionData.class));

        GraphAwareRuntime runtime = GraphAwareRuntimeFactory.createRuntime(database);
        runtime.registerModule(mockModule);

        runtime.start();

        try (Transaction tx = database.beginTx()) {
            database.createNode();
            tx.success();
        }

        long firstFailureTimestamp;
        try (Transaction tx = database.beginTx()) {
            firstFailureTimestamp = repository.getModuleMetadata(mockModule).timestamp();
        }

        Thread.sleep(1);

        try (Transaction tx = database.beginTx()) {
            database.createNode();
            tx.success();
        }

        long secondFailureTimestamp;
        try (Transaction tx = database.beginTx()) {
            secondFailureTimestamp = repository.getModuleMetadata(mockModule).timestamp();
        }

        assertEquals(firstFailureTimestamp, secondFailureTimestamp);
    }