Yesterday I made a project in eclipse, and it was working, compiling. I used Eclipse Galileo for Java EE. Today I open eclipse and see lots of errors saying that stuff is not available and that it is only available if source level is 1.5.
What to do?
Try this:
Go to your project's Properties, set the Java Compiler compliance level to 1.6, let it rebuild the project, then switched back to 1.7 and rebuild it again.
It worked for me :)
I had the same issue. For me, my project's compiler settings were imported from my Workspace Configuration settings, which was set to 1.8...
I tried switching compiler levels and rebuilding, but no luck. What did the trick though, was the following:
On your file system
Navigate to your project.
Delete the .settings folder.
Delete the .project file
In Eclipse:
Delete the project from your workspace - Ensure that you do not check the "Delete project contents on disk..." checkbox
Import your project and allow it to build
I had the same issue after I installed Eclipse on Centos 7.
However in my case changing the Compiler compliance level did not fix the problem.
To fix the problem I changed the Eclipse Installed JREs Window->Preferences->Java->Installed JREs path, which was /usr/lib/jvm/java-1.8.0-openjdk-1.8.0.242.b08-0.el7_7.x86_64 to an Oracle JDK at /usr/lib/jdk1.8.0_121-linux-x64
After this change the problem went away.
