#vulnerable code 
                             @Override
	public Class<?> getQualifierColumnType() {

		Assert.isTrue(isQualified(), "The qualifier column type is only defined for properties that are qualified");

		if (isMap()) {
			return getTypeInformation().getComponentType().getType();
		}

		// for lists and arrays
		return Integer.class;
	} 
                            #location 7 
                            #vulnerability type NULL_DEREFERENCE
#fixed code
                             @Override
	public Class<?> getQualifierColumnType() {

		Assert.isTrue(isQualified(), "The qualifier column type is only defined for properties that are qualified");

		if (isMap()) {
			return getTypeInformation().getRequiredComponentType().getType();
		}

		// for lists and arrays
		return Integer.class;
	}