Clirr maven plugin can fail on Java 8 (e.g. main, UI, pages, etc.)

When running mvn clirr:clirr directly or when generating the site (which includes the clirr report) one might run into the folloing error:

[INFO] org.apache.bcel.classfile.ClassFormatException: Invalid byte tag in constant pool: 18

Additionally, one might see:

Caused by: java.lang.NullPointerException
    at org.codehaus.mojo.clirr.ClirrReportGenerator$ApiChangeComparator.compare(ClirrReportGenerator.java:64)
    at org.codehaus.mojo.clirr.ClirrReportGenerator$ApiChangeComparator.compare(ClirrReportGenerator.java:57)

Which is due to an ApiChange being initialized to null.

Both bugs (see links below) have been fixed in org.codehaus.mojo:clirr-maven-plugin:2.8 and we should therefore update our plugin to this latest version.