JasperReport Export PDF Render Khmer Unicode incorrectly in JAVA

[piseth.ath]

I currently user JasperReport 6.12.2 to export PDF which has Khmer Unocde in side.
I test with JasperReport Studio. It's working great as result below: 


but when I use java code export in eclipse it export incorrectly as below result: 

I'm a newer to use JasperReport. Please help me.
I've read document of JasperReport and I added dependency as follow:
itextpdf-5.5.13.1.jar
jasperreports-6.12.2.jar

jasperreports-fonts-6.12.2.jar

jasperreports-chart-themes-6.12.2.jar

jasperreports-metadata-6.12.2.jar

I use JRE 1.8 with Apache Tomcate 7.
I tried encode export to UTF-8 but it sill not work.

Please help me, Best Regars,

[I am Leo]

You have to import the font that supports Khmer Unicode to your Java application. 
You can check the demo project here: https://github.com/TIBCOSoftware/jasperreports/releases

Download the http://jasperreports-6.12.2-project.zip/, unzip and check the demosamplesfonts.

Basically, import your font, check the fonts.xml. Then create 2 properties files, jasperreports.properties and jasperreports_extension.properties.

Bingo, your text display correctly.