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I am using Eclipse Juno with Java 1.7 and i have created a test project. Now the problem is with project explorer. Project explorer is not showing compilation errors if class have any error.
I cleaned, closed , and rebuild the project but nothing is changed. It is still not showing errors in project explorer.It was working fine with Helios.
As I can see in your project explorer there is a RED exclamation mark over your project name which means there is a problem with the build path in your project. See here for more details.
Check the Build Path of the project by right-clicking the project and selecting Build Path -> Configure Build Path.
One problem I often encountered is different people using different Java SDK and so when the exact SDK is not available on your machine, you need to change to your Java SDK (via
JRE System Library -> Alternate JRE). A better way to avoid this problem is to always select the JRE System Library from Workspace default JRE or Execution Environment.