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After executing update this week of NetBeans 7.1 (of build 201112071828), compiling of project with nbm-maven-plugin does no longer work. Error message being: Failed to execute goal org.codehaus.mojo:nbm-maven-plugin:3.7:manifest (default-manifest) on project creator: Execution default-manifest of goal org.codehaus.mojo:nbm-maven-plugin:3.7:manifest failed: For artifact {null:null:null:jar}: The groupId cannot be empty. I tested both nbm-maven-plugin:3.5 and 3.7. It still worked to compile with terminal. So I asked for solution on mailing list and got the advice of changing from the bundled maven to my external one. Bundled being version 3.0.4 and my external being 2.2.1. It now works properly to compile again.
could you check if the 3.0.4 works in external, cmd line setup? so that we know it's a maven 3.0.4 vs. nbm-maven-plugin issue or it's a problem in embedding. also can you run the embedded build with debug messages on and attach the log to the issue? thanks.
Would need a test case to reproduce. Assuming the problem can be reproduced from the command line (which is very likely since NetBeans just forks a process to run Maven), should be filed upstream: https://jira.codehaus.org/browse/MNBMODULE