#vulnerable code 
                             private void setupOrTeardown(DbUnitTestContext testContext, boolean isSetup,
			Collection<AnnotationAttributes> annotations) throws Exception {
		IDatabaseConnection connection = testContext.getConnection();
		DatabaseOperation lastOperation = null;
		for (AnnotationAttributes annotation : annotations) {
			for (String dataSetLocation : annotation.getValue()) {
				DatabaseOperation operation = annotation.getType();
				org.dbunit.operation.DatabaseOperation dbUnitDatabaseOperation = getDbUnitDatabaseOperation(
						testContext, operation, lastOperation);
				IDataSet dataSet = loadDataset(testContext, dataSetLocation);
				if (dataSet != null) {
					if (logger.isDebugEnabled()) {
						logger.debug("Executing " + (isSetup ? "Setup" : "Teardown") + " of @DatabaseTest using "
								+ operation + " on " + dataSetLocation);
					}
					dbUnitDatabaseOperation.execute(connection, dataSet);
					lastOperation = operation;
				}
			}
		}
	} 
                            #location 16 
                            #vulnerability type NULL_DEREFERENCE
#fixed code
                             private void setupOrTeardown(DbUnitTestContext testContext, boolean isSetup,
			Collection<AnnotationAttributes> annotations) throws Exception {
		IDatabaseConnection connection = testContext.getConnection();
		for (AnnotationAttributes annotation : annotations) {
			List<IDataSet> datasets = loadDataSets(testContext, annotation);
			DatabaseOperation operation = annotation.getType();
			org.dbunit.operation.DatabaseOperation dbUnitOperation = getDbUnitDatabaseOperation(testContext, operation);
			if (!datasets.isEmpty()) {
				if (logger.isDebugEnabled()) {
					logger.debug("Executing " + (isSetup ? "Setup" : "Teardown") + " of @DatabaseTest using "
							+ operation + " on " + datasets.toString());
				}
				IDataSet dataSet = new CompositeDataSet(datasets.toArray(new IDataSet[datasets.size()]));
				dbUnitOperation.execute(connection, dataSet);
			}
		}
	}