Hi
I downloaded STS 4.2.1.RELEASE and created a simple demo project.
I get a weird Problem saying:
Description Resource Path Location Type
Unknown pom.xml /demo line 1 Maven Configuration Problem
When I open the pom.xml, the first line is highlighted with an error.
I can load the pom.xml into another version of eclipse without problem.
Here is the screen shot

We are looking into it already. Looks like there is NPE occurring in Maven Jar Archiver plugin in M2E and that is the source for that error... I have created: https://bugs.eclipse.org/bugs/show_bug.cgi?id=547409 for now
Until its fixed just downgrade the maven-jar-plugin like here:
https://github.com/spring-projects/spring-boot/issues/16846
Most helpful comment
We are looking into it already. Looks like there is NPE occurring in Maven Jar Archiver plugin in M2E and that is the source for that error... I have created: https://bugs.eclipse.org/bugs/show_bug.cgi?id=547409 for now