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I have added plugin Jara's Test while logged as nbtester. It is not possible to delete this pluigin. The reason may be that I added it to new category and then updated the category of this plugin. I am not able to find reproducible scenario, but the plugin is still there and I am not able to remove it.
I can't repeat this defect an any other plugin.
It is strange and I am not able to find steps to reproduce. But it happened again. There is Accessibility plugin in live pluginportal that I am not able to remove. I am reopening this issue.
I was finally able to nail down the scenario that caused this. This happened when there were two or more categories with the same name but different cases. The "equals" on the category class had a "equalsignorecase" which I think caused problems with the JPA implementation. I changed this to "equals" and I also remove any categories linked with a plugin during the delete to make sure the constraint violation isn't triggered on the delete.
Verified.