MINOR: Improve EOS example exception handling#8052

Merged

hachikuji merged 8 commits into

apache:trunkfrom

abbccdda:no_exception_catch

Feb 20, 2020

Commits on Feb 19, 2020

make code clean
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add more exception types
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address comments
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avoid doing the separate func
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simply catch
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intellij recommendation
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remove standalone mode
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fix group mode
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