Using EGit, sometimes when switching branches, I get an error in the following form:

Errors occurred during the build.
Errors running builder 'JAX-RS Builder' on project 'sheker-sp-ws'.
Resource '/sheker-sp-ws/src/main/java/com/sheker/ws/rest/MyClass.java' does not exist.
Resource '/sheker-sp-ws/src/main/java/com/sheker/ws/rest/MyClass.java' does not exist.
Errors running builder 'JAX-RS Builder' on project 'sheker-prod-ws'.
Resource '/sheker-prod-ws/src/main/java/com/sheker/ws/rest/AnotherClass.java' does not exist.
Resource '/sheker-prod-ws/src/main/java/com/sheker/ws/rest/AnotherClass.java' does not exist.