Ryan Delucchi asked here in comment #3 to Tom Hawtin's answer:

why is Class.newInstance() "evil"?

this in response to the code sample:

// Avoid Class.newInstance, for it is evil.
Constructor<? extends Runnable> ctor = runClass.getConstructor();
Runnable doRun = ctor.newInstance();

so, why is it Evil?

java constructor runtime instantiation
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