#vulnerable code 
                                private void execute() throws IOException, TransformerException, JAXBException, MarshallerException {
        final CFLint cflint = new CFLint(buildConfigChain());
        cflint.setVerbose(verbose);
        cflint.setLogError(logerror);
        cflint.setQuiet(quiet);
        cflint.setStrictIncludes(strictInclude);
        cflint.setShowProgress(showprogress);
        cflint.setProgressUsesThread(progressUsesThread);
        if (extensions != null && extensions.trim().length() > 0) {
            try {
                cflint.setAllowedExtensions(Arrays.asList(extensions.trim().split(",")));
            } catch (final Exception e) {
                System.err.println(
                        "Unable to use extensions (" + extensions + ") using default instead. " + e.getMessage());
            }
        }
        final CFLintFilter filter = createBaseFilter();
        cflint.getBugs().setFilter(filter);

        for (final String scanfolder : folder) {
            cflint.scan(scanfolder);
        }
        if (stdIn) {
            final StringBuilder source = new StringBuilder();
            final Scanner scanner = new Scanner(System.in);
            while (scanner.hasNextLine()) {
                final String nextLine = scanner.nextLine();
                source.append(nextLine);
                source.append(System.lineSeparator());
            }
            scanner.close();
            cflint.process(source.toString(), stdInFile);
        }
        if (xmlOutput) {
            final Writer xmlwriter = stdOut ? new OutputStreamWriter(System.out)
                    : createWriter(xmlOutFile, StandardCharsets.UTF_8);
            if ("findbugs".equalsIgnoreCase(xmlstyle)) {
                if (verbose) {
                    display("Writing XML findbugs style" + (stdOut ? "." : " to " + xmlOutFile));
                }
                new XMLOutput().outputFindBugs(cflint.getBugs(), xmlwriter, showStats);
            } else {
                if (verbose) {
                    display("Writing XML" + (stdOut ? "." : " to " + xmlOutFile));
                }
                new DefaultCFlintResultMarshaller().output(cflint.getBugs(), xmlwriter, showStats);
            }
        }
        if (textOutput) {
            if (textOutFile != null && verbose) {
                display("Writing text" + (stdOut ? "." : " to " + textOutFile));
            }
            final Writer textwriter = stdOut || textOutFile == null ? new OutputStreamWriter(System.out)
                    : new FileWriter(textOutFile);
            new TextOutput().output(cflint.getBugs(), textwriter, showStats);
        }
        if (htmlOutput) {
            try {
                if (verbose) {
                    display("Writing HTML" + (stdOut ? "." : " to " + htmlOutFile));
                }
                final Writer htmlwriter = stdOut ? new OutputStreamWriter(System.out) : new FileWriter(htmlOutFile);
                new HTMLOutput(htmlStyle).output(cflint.getBugs(), htmlwriter, showStats);
            } catch (final TransformerException e) {
                throw new IOException(e);
            }
        }
        if (jsonOutput) {
            if (verbose) {
                display("Writing JSON" + (stdOut ? "." : " to " + jsonOutFile));
            }
            final Writer jsonwriter = stdOut ? new OutputStreamWriter(System.out) : new FileWriter(jsonOutFile);
            new JSONOutput().output(cflint.getBugs(), jsonwriter, showStats);
        }
        if (verbose) {
            display("Total files scanned: " + cflint.getStats().getFileCount());
            display("Total size: " + cflint.getStats().getTotalSize());
        }
    } 
                            #location 18 
                            #vulnerability type NULL_DEREFERENCE
#fixed code
                                private void execute() throws IOException, TransformerException, JAXBException, MarshallerException {
        final CFLint cflint = new CFLint(buildConfigChain());
        cflint.setVerbose(verbose);
        cflint.setLogError(logerror);
        cflint.setQuiet(quiet);
        cflint.setStrictIncludes(strictInclude);
        cflint.setShowProgress(showprogress);
        cflint.setProgressUsesThread(progressUsesThread);
        if (extensions != null && extensions.trim().length() > 0) {
            try {
                cflint.setAllowedExtensions(Arrays.asList(extensions.trim().split(",")));
            } catch (final Exception e) {
                System.err.println(
                        "Unable to use extensions (" + extensions + ") using default instead. " + e.getMessage());
            }
        }
        final CFLintFilter filter = createBaseFilter();
        cflint.getBugs().setFilter(filter);

        for (final String scanfolder : folder) {
            cflint.scan(scanfolder);
        }
        if (stdIn) {
            final StringBuilder source = new StringBuilder();
            final Scanner scanner = new Scanner(System.in);
            while (scanner.hasNextLine()) {
                final String nextLine = scanner.nextLine();
                source.append(nextLine);
                source.append(System.lineSeparator());
            }
            scanner.close();
            cflint.process(source.toString(), stdInFile);
        }
        if (xmlOutput) {
            final Writer xmlwriter = stdOut ? new OutputStreamWriter(System.out)
                    : createWriter(xmlOutFile, StandardCharsets.UTF_8);
            if ("findbugs".equalsIgnoreCase(xmlstyle)) {
                if (verbose) {
                    display("Writing XML findbugs style" + (stdOut ? "." : " to " + xmlOutFile));
                }
                new XMLOutput().outputFindBugs(cflint.getBugs(), xmlwriter, showStats, cflint.getStats());
            } else {
                if (verbose) {
                    display("Writing XML" + (stdOut ? "." : " to " + xmlOutFile));
                }
                new DefaultCFlintResultMarshaller().output(cflint.getBugs(), xmlwriter, showStats);
            }
        }
        if (textOutput) {
            if (textOutFile != null && verbose) {
                display("Writing text" + (stdOut ? "." : " to " + textOutFile));
            }
            final Writer textwriter = stdOut || textOutFile == null ? new OutputStreamWriter(System.out)
                    : new FileWriter(textOutFile);
            new TextOutput().output(cflint.getBugs(), textwriter, showStats);
        }
        if (htmlOutput) {
            try {
                if (verbose) {
                    display("Writing HTML" + (stdOut ? "." : " to " + htmlOutFile));
                }
                final Writer htmlwriter = stdOut ? new OutputStreamWriter(System.out) : new FileWriter(htmlOutFile);
                new HTMLOutput(htmlStyle).output(cflint.getBugs(), htmlwriter, showStats, cflint.getStats());
            } catch (final TransformerException e) {
                throw new IOException(e);
            }
        }
        if (jsonOutput) {
            if (verbose) {
                display("Writing JSON" + (stdOut ? "." : " to " + jsonOutFile));
            }
            final Writer jsonwriter = stdOut ? new OutputStreamWriter(System.out) : new FileWriter(jsonOutFile);
            new JSONOutput().output(cflint.getBugs(), jsonwriter, showStats);
        }
        if (verbose) {
            display("Total files scanned: " + cflint.getStats().getFileCount());
            display("Total size: " + cflint.getStats().getTotalSize());
        }
    }