[java.io.IOException: Problem reading font data]

In my particular case, after I had upgraded Ubuntu 18.04 server version, the reported issue started to happen. The font was already present on the Ubuntu Server.   I had to run fc-cache -f -v to clear the font cache. however, I had to first apt install fontconfig  and then run c-cache -f -v to resolve the issue.

[The type java.lang.CharSequence cannot be resolved. It is indirectly referenced from required .class files]

Using latest 6.1.1  and JDK 1.8 I get compile error for one particular report when compiling using maven plugin com.alexnederlof:jasperreports-plugin:1.7

[ERROR] Failed to execute goal com.alexnederlof:jasperreports-plugin:1.7:jasper (default) on project myproject: Some Jasper reports could not be compiled. See log above for details. net.sf.jasperreports.engine.JRException: Could not compile test.jrxml: Errors were encountered when compiling report expressions class file:
[ERROR] 1. The type java.lang.CharSequence cannot be resolved. It is indirectly referenced from required .class files
[ERROR] value = ((java.lang.String)field_status.getValue()).equals("ACTIVE"); //$JR_EXPR_ID=11$
[ERROR] <--------------------------------------------------------------->
[ERROR] 1 errors
[ERROR] -> [Help 1]