How to sanitize request object in the #restcontroller - spring

Question

I'm doing a static code analysis using checkmarx, which gave me medium vulnerabilities for #RequestBody.
Will place a sample code below, could someone help me fixing this issue.
#RestController
#RequestMapping("/api")
#Slf4j
#Validated
public class Myclass {
#Autowired
SplitClass split;
#PostMapping(path = "/something", consumes = "application/json", produces = "application/json")
public int splitter(#RequestBody SplitRequestVO **splitReq**) {
int response = 0;
try {
int value = split.methodName(splitReq);
if(value == 1) {
response = 1;
}else {
response = 0;
}
}catch(Exception e) {
log.error("Excpetion in the MY Class controller" +e.getMessage());
}
return response;
}
}
Every time it is showing error with this util class. please check whats wrong in this class.
#Slf4j
public class FileUtil {
private FileUtil() {
throw new IllegalArgumentException("FileUtil.class");
}
public static void createFileFromBytes(String fileName, byte[] bytes) throws IOException {
File file = new File(fileName);
try (FileOutputStream fos = new FileOutputStream(file)) {
fos.write(bytes);
fos.flush();
} catch (IOException exc) {
log.error("Exception in creating file from bytes : "+exc.getMessage());
}
}
public static void deleteFile(String fileName) {
log.info("Entry into deleteFile method.");
try {
File file = new File(fileName);
if (file.exists()) {
Files.delete(file.toPath());
if (log.isDebugEnabled())
log.debug("file deleted:" + fileName);
}
} catch (Exception e) {
log.error("Exception in deleting the file : "+e.getMessage());
}
log.info("Exit from deleteFile method ");
}
public static byte[] getBytesFromFile(File file) throws IOException {
log.info("Entry into getBytesFromFile method");
byte[] bytes = null;
try (InputStream is = new FileInputStream(file)) {
long length = file.length();
if (length > 2147483647L) {
log.error("File Too large:" + file.getName());
}
bytes = new byte[(int) length];
int offset = 0;
int numRead = 0;
while (offset < bytes.length && (numRead = is.read(bytes, offset, bytes.length - offset)) >= 0)
offset += numRead;
if (offset < bytes.length)
throw new IOException("Could not completely read file " + file.getName());
} catch (Exception e) {
log.error("Exception in getBytesFromFile : "+e.getMessage());
}
log.info("Exit from getBytesFromFile method ");
return bytes;
}
public static byte[] getBytesFromFile(String fileName) throws IOException {
File file = new File(fileName);
return getBytesFromFile(file);
}
}
Here im facing the vulnerability issue to fix in the block letters. Appreciated foy help.
Thanks in advance.