Code tried using Ice-pdf "Open Source" :

Approach:1 Packaging fonts using JAR

 FontManager fontManager = FontManager.getInstance();
String jarFontPath = "d:/font-jar/icepdf-fonts.jar";
String jarFontPackage = "fonts";
// find the font names that are in the jar
List<String> fontNames = readJarFontNames(fontManager, jarFontPath);
fontManager.readFontPackage(jarFontPackage, fontNames);

Approach: 2 load font resources from a specific package

fontManager.readFontPackage("fonts", Arrays.asList(
new String[]{"Gopika.pfb",
"GopikaLightItalic.pfb",
"GopikaTwo.pfb",
"GopikaTwoBold.pfb","GopikaTwoBoldItalic.pfb","GopikaTwoItalic.pfb","TitleLightTwo.pfb","TitleLightTwoItalic.pfb","TitleTwo.pfb","TitleTwoItalic.pfb","gopb_.pfb","gopbi_.pfb","gopi_.pfb","gopl_.pfb"}));

Both the approaches not working to render fonts for particular pdf.
Code executes properly please find below mention logs.

n both case code is running properly and the received LOGS are:-
Jan 23, 2017 1:32:49 PM org.icepdf.core.pobjects.fonts.FontFactory <clinit>
FINE: NFont font library was not found on the class path
Jan 23, 2017 1:32:49 PM org.icepdf.core.pobjects.fonts.FontFactory createFontFile
FINE: Successfully loaded OFont: file:/C:/Users/MY_WorkSpacePath/Icepdf/bin/fonts/Gopika.pfb
Jan 23, 2017 1:32:49 PM org.icepdf.core.pobjects.fonts.FontManager readFontPackage
FINER: Adding system font: Gopika file:/C:/Users/MY_WorkSpacePath/Icepdf/bin/fonts/Gopika.pfb
.........same logs as above for other required fonts.......
At last....
Jan 23, 2017 1:32:51 PM org.icepdf.core.pobjects.fonts.ofont.Font init
FINE: F1 - WinAnsiEncoding Times New Roman org.icepdf.core.pobjects.fonts.ofont.OFont@4c432981 true
Jan 23, 2017 1:32:51 PM org.icepdf.core.pobjects.fonts.ofont.Font init
FINE: F2 - WinAnsiEncoding Gopika-Bold org.icepdf.core.pobjects.fonts.ofont.OFont@32fa5750 true
Jan 23, 2017 1:32:51 PM org.icepdf.core.pobjects.fonts.ofont.Font init
FINE: F3 - WinAnsiEncoding TitleTwo org.icepdf.core.pobjects.fonts.ofont.OFont@2c83474 true
Jan 23, 2017 1:32:51 PM org.icepdf.core.pobjects.fonts.ofont.Font init
FINE: F4 - WinAnsiEncoding Gopika org.icepdf.core.pobjects.fonts.ofont.OFont@36a5ffd3 true
Jan 23, 2017 1:32:51 PM org.icepdf.core.util.content.OContentParser parse
FINER: End of Content Stream

Can it be a bug in Open source ?