I can confirm that using java 8 (openjdk) on 15.10 fixes rendering problems in skype. However one minor corruption occurs in IntelliJ IDEA itself when running on java 8 (openjdk) (see screen-shot).
After upgrade to 16.04 as of 8 Dec 2015, none of java versions cause any corruption in skype, however now both java versions - 7 and 8 (openjdk) - exhibit the corruption in IntelliJ IDEA as in the attached screen-shot.
I can confirm that using java 8 (openjdk) on 15.10 fixes rendering problems in skype. However one minor corruption occurs in IntelliJ IDEA itself when running on java 8 (openjdk) (see screen-shot).
After upgrade to 16.04 as of 8 Dec 2015, none of java versions cause any corruption in skype, however now both java versions - 7 and 8 (openjdk) - exhibit the corruption in IntelliJ IDEA as in the attached screen-shot.