From where does the jasperreports engine refer to the fonts from?

I've an application where I use jasper reports libraries for generating report from online. Whatever font I use other than Helvetica, to generate a pdf report, is a problem. I'm not able to detect from where the font is referred/loaded. I dont have any explicit classes for either Helvetica or Times-Roman.

Following is the error thrown:

net.sf.jasperreports.engine.JRRuntimeException: Could not load the following font : 
pdfFontName   : Times-Roman
pdfEncoding   : Identity-H
isPdfEmbedded : false
at net.sf.jasperreports.engine.export.JRPdfExporter.getFont(JRPdfExporter.java:2036) ~[jasperreports-5.5.0.jar:5.5.0]
at net.sf.jasperreports.engine.export.JRPdfExporter.getChunk(JRPdfExporter.java:1818) ~[jasperreports-5.5.0.jar:5.5.0]
at net.sf.jasperreports.engine.export.JRPdfExporter.getPhrase(JRPdfExporter.java:1787) ~[jasperreports-5.5.0.jar:5.5.0]
at net.sf.jasperreports.engine.export.SimplePdfTextRenderer.getPhrase(SimplePdfTextRenderer.java:89) ~[jasperreports-5.5.0.jar:5.5.0]
at net.sf.jasperreports.engine.export.SimplePdfTextRenderer.render(SimplePdfTextRenderer.java:99) ~[jasperreports-5.5.0.jar:5.5.0]
at net.sf.jasperreports.engine.export.JRPdfExporter.exportText(JRPdfExporter.java:2158) ~[jasperreports-5.5.0.jar:5.5.0]
at net.sf.jasperreports.engine.export.JRPdfExporter.exportElements(JRPdfExporter.java:861) ~[jasperreports-5.5.0.jar:5.5.0]
at net.sf.jasperreports.engine.export.JRPdfExporter.exportPage(JRPdfExporter.java:821) ~[jasperreports-5.5.0.jar:5.5.0]
at net.sf.jasperreports.engine.export.JRPdfExporter.exportReportToStream(JRPdfExporter.java:698) ~[jasperreports-5.5.0.jar:5.5.0]
at net.sf.jasperreports.engine.export.JRPdfExporter.exportReport(JRPdfExporter.java:420) ~[jasperreports-5.5.0.jar:5.5.0]

But for the same report if I give PDF font name as Helvetica, everything runs fine.

Can anybody please help me understand how this works ? Also, If I want to add some new font, where can I add it ?

Followed the steps to add a new font in jasper fonts jar , mentioned in below link

http://www.codesuggestions.com/java/jasper-reports/adding-custom-fonts-t...

Earlier error vanished. A new error popped up.

Caused by: java.lang.NoClassDefFoundError: Could not initialize class net.sf.jasperreports.engine.util.JRStyledTextParser
at net.sf.jasperreports.engine.fill.JRBaseFiller.<init>(JRBaseFiller.java:121) ~[jasperreports-5.5.0.jar:5.5.0]
at net.sf.jasperreports.engine.fill.JRVerticalFiller.<init>(JRVerticalFiller.java:88) ~[jasperreports-5.5.0.jar:5.5.0]
at net.sf.jasperreports.engine.fill.JRVerticalFiller.<init>(JRVerticalFiller.java:103) ~[jasperreports-5.5.0.jar:5.5.0]
at net.sf.jasperreports.engine.fill.JRVerticalFiller.<init>(JRVerticalFiller.java:61) ~[jasperreports-5.5.0.jar:5.5.0]
at net.sf.jasperreports.engine.fill.JRFiller.createFiller(JRFiller.java:179) ~[jasperreports-5.5.0.jar:5.5.0]
at net.sf.jasperreports.engine.fill.JRFiller.fill(JRFiller.java:81) ~[jasperreports-5.5.0.jar:5.5.0]
at net.sf.jasperreports.engine.JasperFillManager.fill(JasperFillManager.java:446) ~[jasperreports-5.5.0.jar:5.5.0]
at net.sf.jasperreports.engine.JasperFillManager.fill(JasperFillManager.java:276) ~[jasperreports-5.5.0.jar:5.5.0]
at net.sf.jasperreports.engine.JasperFillManager.fillReport(JasperFillManager.java:745) ~[jasperreports-5.5.0.jar:5.5.0]

jasperreports-5.5.0.jar is present in the classspath of the application, still facing this error.

Solution

The problem with me was that I had understood the exception wrong ! Hence following the wrong solutions.

The solution mentioned in the links that I followed was for addition of custom fonts for FontName attribute and not PDFFontName attribute.

Jasper's PDFExporter refers to fonts from iText.jar. Hence changing the getFont() method call in my class helped me.

font = FontFactory.getFont(
                pdfFont.getPdfFontName(),
                pdfFont.getPdfEncoding(),
                pdfFont.isPdfEmbedded(),
                jrFont.getFontSize() * fontSizeScale,
                pdfFontStyle,
                forecolor
                );

I changed this line and provided the absolute path for my font.ttf.

font = FontFactory.getFont(
                "D\\fonts\\Arial.ttf",
                BaseFont.IDENTITY_H,
                BaseFont.EMBEDDED,
                jrFont.getFontSize() * fontSizeScale,
                pdfFontStyle,
                forecolor
                );