1. Problem:
We want to update the java 1.6 to java 1.7 and appear error:
java compiler level does not match the version of the installed java project facet
2. Solution:
step a: Install the java jdk 1.7
step b: right chlick -> properties -> choose project facets -> java item (default 1.6, please click the 1.6 icon and choose 1.7)
Reference:
Youtube Solution
