Convert xml to json in Jenkinsfile - json

Question

I have a problem with a method in my Jenkinsfile when i tried to convert xml to json. That is the method, and the pipeline.
I tried to pass the method directly to the echo, but it gives me an error and the pipeline fails
Sorry but i don't know that details i could give about the error, because i start to learning and this is the first time that i see this code.
ERROR: org.xml.sax.SAXParseException; lineNumber: 2; columnNumber: 1; Content is not allowed in prolog.
I edit my question and i add a bat in stage OWASP dependencies testing. This bat create automatically the xml, i put in a validator xml and this did not errors. So i don't know if the problem is with the code of Jenkinsfile or xml, because the error is the same. I put part of xml code because it's very long, but
the error is still in the second line.
XML Code:
<?xml version="1.0" encoding="UTF-8"?>
<analysis xmlns="https://jeremylong.github.io/DependencyCheck/dependency-check.2.2.xsd">
<scanInfo>
<engineVersion>5.2.2</engineVersion>
<dataSource>
<name>NVD CVE Checked</name>
<timestamp>2019-11-25T09:01:51</timestamp>
</dataSource>
<datasource>...</datasource>
</scanInfo>
....................
</analysis>
import groovy.json.*;
def getDependencyResumeFromXML(pathReport){
def xml = bat(script:'type ' + pathReport, returnStdout:true);
def x = new XmlParser().parseText(xml);
def nDep = x.dependencies.dependency.size();
def dependencies = [:];
for(def i=0;i<nDep;i++){
dependencies[i] = [fileName: x.dependencies.dependency[i].fileName.text(),description:x.dependencies.dependency[i].description.text(),vulnerabilities:[:]];
def nVul = x.dependencies.dependency[i].vulnerabilities.vulnerability.size();
for(def j=0;j<nVul;j++){
dependencies[i].vulnerabilities[j] = [
name:x.dependencies.dependency[i].vulnerabilities.vulnerability[j].name.text(), cvssScore:x.dependencies.dependency[i].vulnerabilities.vulnerability[j].cvssScore.text(),
severity:x.dependencies.dependency[i].vulnerabilities.vulnerability[j].severity.text(),
cwe:x.dependencies.dependency[i].vulnerabilities.vulnerability[j].cwe.text(),
description:x.dependencies.dependency[i].vulnerabilities.vulnerability[j].description.text(),
];
}
}
return dependencies;
}
pipeline{
.......
stages{
stage('OWASP dependencies testing'){
steps{
script{
bat 'mvn org.owasp:dependency-check-maven:check';
def pathReport = 'C:\\tmp\\workspace\\umbrella-pipeline-prueba\\target\\dependency-check\\dependency-check-report.xml';
def xml = bat(script:'type ' + pathReport, returnStdout:true);
echo '------------------ 1';
echo xml;
echo '------------------ 2';
echo '--------------------------------'
def dependencias = getDependencyResumeFromXML(pathReport);
echo '------------- 3';
echo dependencias;
echo '------------- 4';
}
}
}
}
}