Eclipse Juno build error with "Maven Project Builder"
eclipse, eclipse-juno, eclipse-plugin, m2eclipse
Solution
If you are using external maven check if that is selected
Also try deleting .m2 and check settings file over there if it is pointing to correct place in localRepository tag
C:\Users\sunny.m2\repository
Problem
When I try to clean & build my Maven project I get the following error: ``` Errors occurred during the build. Errors running builder 'Maven Project Builder' on project '(Hid Project Name)'. org/apache/maven/project/MavenProject Errors running builder 'Maven Project Builder' on project '(Hid Project Name)'. org/apache/maven/project/MavenProject ``` similarly with the clean all process, it throws the following: ``` Errors occurred during the build. Errors running builder 'Maven Project Builder' on project '(Hid Project Name)'. loader constraint violation: loader (instance of org/eclipse/osgi/internal/baseadaptor/DefaultClassLoader) previously initiated loading for a different type with name "org/apache/maven/plugin/MojoExecution" Errors running builder 'Maven Project Builder' on project '(Hid Project Name)'. org/apache/maven/plugin/MojoExecution Errors running builder 'Maven Project Builder' on project '(Hid Project Name)'. org/apache/maven/plugin/MojoExecution Errors running builder 'Maven Project Builder' on project '(Hid Project Name)'. org/apache/maven/plugin/MojoExecution Errors running builder 'Maven Project Builder' on project '(Hid Project Name)'. org/apache/maven/plugin/MojoExecution Errors running builder 'Maven Project Builder' on project '(Hid Project Name)'. org/apache/maven/plugin/MojoExecution Errors running builder 'Maven Project Builder' on project '(Hid Project Name)'. org/apache/maven/plugin/MojoExecution Errors running builder 'Maven Project Builder' on project '(Hid Project Name)'. org/apache/maven/plugin/MojoExecution Errors running builder 'Maven Project Builder' on project '(Hid Project Name)'. org/apache/maven/plugin/MojoExecution Errors running builder 'Maven Project Builder' on project '(Hid Project Name)'. org/apache/maven/plugin/MojoExecution Errors running builder 'Maven Project Builder' on project '(Hid Project Name)'. org/apache/maven/plugin/MojoExecution ``` Any ideas what causes this?