Ill just add that JRE is Java Runtime Environnement and JDK is Java Development Kit which contains the JRE for running Java and other tools to develop in Java. My problem here is that how can I get the 1.8.0_191 or higher version of the JDK or any other solutions to implement, so that I won't get this warning and the PDFRenderer works faster. If you open JDK folder and see, youll have JRE folder inside it which is the same of JRE folder initially you have. If you want to develop Java programs then please install the openjdk-8-jdk package. Which from what i understand it means i have to update to JDK 1.8.0_191 or higher to get the best experience out of the object. The openjdk-8-jre package contains just the Java Runtime Environment. INFO: or call tProperty('', '.KcmsServiceProvider') INFO: use the option =.KcmsServiceProvider Only developers and Enterprise administrators should download these releases. For production use Oracle recommends downloading the latest JDK and JRE versions and allowing auto-update. Java SE 8u211 and later updates are available, under the Java SE OTN License. Use for other purposes, including production or commercial use, requires a Java SE subscription or another Oracle license. These Java SE 8 update releases are provided under the Binary Code License (BCL). These downloads can be used for development, personal use, or to run Oracle licensed products. INFO: update to the latest 1.8 or 9 version (>= 1.8.0_191 or >= 9.0.4), Java SE subscribers will receive JDK 11 updates until at least September of 2026.

INFO: To get higher rendering speed on old java 1.8 or 9 versions, INFO: Your current java version is: 1.8.0_171ġ1:46:48 PM .PDFRenderer suggestKCMS

If they are not available on your system and you can not install them you can download from here. I'm trying to use PDFRenderer from PDFBox and works fine but it gives me a warning saying: 11:46:48 PM .PDFRenderer suggestKCMS the open-jdk-jre 1.8 or 1.7 included in your system.

Java jdk and jre 1.8 download