Errors location are marked with a red @ icon.
Successfully compiled are marked with a green @ icon.
Ignored annotation (f.e. regular JavaDoc) are not marked at all.
If you are using an annotation.properties file, this one must be placed in your IDEA module root (hence you must have one per module), and named "annotation.properties"
Select your module and select Build > Disable backport175 in the menu.
The @ icon is ugly. Send us your contributions.
The menu label is getting unsync with the actual state. It will be fixed in 1.0 final.
Logs is send to the IDEA log4J system.
Turn it on with the following snip in your IDEA_INSTALL/bin/log.xml file: