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1) Create module by New Module Wizard 2) Register new CallableSystemAction into menu (by Action Wizard - always enabled) 3) Put into generate action.performAction() method's body e.g. System.err.println("I'm not flushed immediatelly"); 4) Run Module 5) Invoke action from the menu You will not see "I'm not flushed immediatelly" immediatelly in the output window of the main IDE (the one where you created a module). Then close the IDE, the message is flushed. Might be caused by new logging implementaion (CCing Yarda). It is regression.
It is the problem of the loggin infrastructure, since it happened this time with Eclipse Importer. Log of the main IDE (dev build) did not appear immediately in the underlaying console. Easily reproducible with module described in the initial comment. Just install it in the running IDE instance, run the Action -> nothing on the console -> exit the IDE, System.err is flushed. Also got this randomly, not sure if it is related: WARNING [null]: Do not call reset() on the error io, only on the output IO. Reset on the error io does nothing.
*** This issue has been marked as a duplicate of 74526 ***
verified duplicate