I’m using PdfConverter to convert word to pdf.But I find that pdfConverter very slow during the first conversion.Then It gets faster.
The response time of my spring boot application use PdfConverter is roughly 12s -> 300ms -> 300ms. So I guess there are cache in PdfConverter.But I don’t find them.The main different time is in PdfConverter#doConvert ->XWPFDocumentVisitor#visitore() visitBodyElements.I don’t find cache in this class.Where is the cache.
Here is a demo code you can reporduce this situation.

PdfOptions options = PdfOptions.create();  
XWPFDocument xwpfDocument;  
String resourceLocation = "classpath:template/cadreTemplate-new.docx";  
File template = ResourceUtils.getFile(resourceLocation);  
try (FileInputStream inputStream = new FileInputStream(template)) {  
xwpfDocument = new XWPFDocument(inputStream);  
}  
PdfConverter.getInstance().convert(xwpfDocument, new ByteArrayOutputStream(), options);

my maven dependency

<dependency>  
    <groupId>fr.opensagres.xdocreport</groupId>  
    <artifactId>fr.opensagres.poi.xwpf.converter.pdf-gae</artifactId>  
    <version>2.0.3</version>  
</dependency>

1. I want to know different word template need to init every time or they only need init once.
2. how could I init PdfConverter to reduce my first request time in spring with an elegant way?

I try different way to find different response time.