When i update my java I found the issue "Project facet Java version 1.7 is not supported" To resolve this issue follow the steps.
Step 1: Uninstall your current version of Java. Step 2: Install a compatible version of Java. Compatible versions include: 1.8. 0.162, 1.8.
If you want to change any jdk version of A specific project than you have to click ---> Project --> JRE System Library --> Properties ---> Inside Classpath Container (JRE System Library) change the Execution Environment to which ever version you want e.g. 1.7 or 1.8.
Facets define characteristics and requirements for Java™ EE projects and are used as part of the runtime configuration. When you add a facet to a project, that project is configured to perform a certain task, fulfill certain requirements, or have certain characteristics.
You need to check what type of JRE is there installed in your IDE,
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