#fixed code
                                public static Object parse(File file, Object ctx, Map tokens, TemplateRegistry registry) throws IOException {

        if (!file.exists())
            throw new CompileException("cannot find file: " + file.getName());

        FileInputStream inStream = null;
        ReadableByteChannel fc = null;
        try {
            inStream = new FileInputStream(file);
            fc = inStream.getChannel();
            ByteBuffer buf = allocateDirect(10);

            StringAppender sb = new StringAppender((int) file.length());

            int read = 0;
            while (read >= 0) {
                buf.rewind();
                read = fc.read(buf);
                buf.rewind();

                for (; read > 0; read--) {
                    sb.append((char) buf.get());
                }
            }

            //noinspection unchecked
            return parse(sb, ctx, tokens, registry);

        }
        catch (FileNotFoundException e) {
            // this can't be thrown, we check for this explicitly.
        }
        finally {
            if (inStream != null) inStream.close();
            if (fc != null) fc.close();
        }

        return null;
    }
#vulnerable code 
                                public static Object parse(File file, Object ctx, Map tokens, TemplateRegistry registry) throws IOException {
        if (!file.exists())
            throw new CompileException("cannot find file: " + file.getName());

        FileInputStream inStream = null;
        ReadableByteChannel fc = null;
        try {
            inStream = new FileInputStream(file);
            fc = inStream.getChannel();
            ByteBuffer buf = allocateDirect(10);

            StringAppender sb = new StringAppender((int) file.length());

            int read = 0;
            while (read >= 0) {
                buf.rewind();
                read = fc.read(buf);
                buf.rewind();

                for (; read > 0; read--) {
                    sb.append((char) buf.get());
                }
            }

            //noinspection unchecked
            return parse(sb, ctx, tokens, registry);

        }
        catch (FileNotFoundException e) {
            // this can't be thrown, we check for this explicitly.
        }
        finally {
            if (inStream != null) inStream.close();
            if (fc != null) fc.close();
        }

        return null;
    } 
                            #location 26 
                            #vulnerability type THREAD_SAFETY_VIOLATION