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Improvement
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Resolution: Unresolved
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Minor
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None
The echo command requires a String or GString to be passed to it (perhaps CharSequence?), and it fails with an obscure error about not having an @DataBoundConstructor otherwise.
Instead, the usual API for some sort of print(Object) is to use toString(), and the echo command should invoke Object#toString() if it gets an argument that it doesn't recognize.