This exception came up when I wanted to rename a local variable in a static 
method:

java.lang.NullPointerException
        at com.intellij.refactoring.c.a.a(Unknown Source)
        at com.intellij.refactoring.c.a.a(Unknown Source)
        at com.intellij.refactoring.c.b.do(Unknown Source)
        at com.intellij.refactoring.a.f$a.run(Unknown Source)
        at com.intellij.usageView.j$2.run(Unknown Source)
        at com.intellij.psi.impl.g.do(Unknown Source)
        at com.intellij.usageView.j$1.run(Unknown Source)
        at com.intellij.command.a.b.a(Unknown Source)
        at com.intellij.usageView.j$3.run(Unknown Source)
        at com.intellij.usageView.j$5.run(Unknown Source)
        at com.intellij.progress.ProgressManager.a(Unknown Source)
        at com.intellij.usageView.j.if(Unknown Source)
        at com.intellij.usageView.j.access$100(Unknown Source)
        at com.intellij.usageView.j$4.run(Unknown Source)
        at java.lang.Thread.run(Thread.java:484)

A very similar exception appeared some time later when attempting to find 
usages of a method:

java.lang.NullPointerException
        at com.intellij.find.b.c.a(Unknown Source)
        at com.intellij.find.b.c.a(Unknown Source)
        at com.intellij.find.b.c.a(Unknown Source)
        at com.intellij.find.b.f$4.run(Unknown Source)
        at com.intellij.psi.impl.g.do(Unknown Source)
        at com.intellij.find.b.f$3.run(Unknown Source)
        at com.intellij.usageView.j$5.run(Unknown Source)
        at com.intellij.progress.ProgressManager.a(Unknown Source)
        at com.intellij.usageView.j.if(Unknown Source)
        at com.intellij.usageView.j.access$100(Unknown Source)
        at com.intellij.usageView.j$4.run(Unknown Source)
        at java.lang.Thread.run(Thread.java:484)

In both cases a very empty "searching for usages" window poped up that would 
not go away again (unless I killed IDEA by closing the console window.)

- Frank


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