Jasper: Font extensions

To support various fonts in PDFs the fonts need to be loaded using a custom classloader. The current thread's classloader needs to be saved:

final ClassLoader contextClassLoader = Thread.currentThread().getContextClassLoader();
try {

 .. do things with a custom classloader

} finally {
 Thread.currentThread().setContextClassLoader(contextClassLoader);
}

The fonts can be exported as jar by users and uploaded to file repository (e.g. /fonts folder ?) to be embedded in PDF. This requires a net.sf.jasperreports.engine.fonts.SimpleFontExtensionsRegistryFactory

• https://community.jaspersoft.com/questions/534323/reportclassloader-and-font-extensions-issue
• http://jasperreports.sourceforge.net/sample.reference/fonts/

Note: for the moment I updated Docker to include MS core fonts (Arial). That needs to be removed when font extensions are working.