#fixed code
                                @Override
    public void before(AlternateMixParameters parameters, TaskExecutionContext executionContext) throws TaskException {
        super.before(parameters, executionContext);
        mixer = new PdfAlternateMixer();
        outputWriter = OutputWriters.newSingleOutputWriter(parameters.getExistingOutputPolicy(), executionContext);
    }
#vulnerable code 
                                @Override
    public void before(AlternateMixParameters parameters, TaskExecutionContext executionContext) throws TaskException {
        super.before(parameters, executionContext);
        mixer = new PdfAlternateMixer(parameters.getFirstInput(), parameters.getSecondInput());
        outputWriter = OutputWriters.newSingleOutputWriter(parameters.getExistingOutputPolicy(), executionContext);
    } 
                            #location 4 
                            #vulnerability type RESOURCE_LEAK