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130 lines
5.4 KiB
130 lines
5.4 KiB
11 months ago
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<!DOCTYPE html>
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<html lang="en">
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<title>Julio Biason .Me 4.3</title>
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<div class="container sidebar-sticky">
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<div class="sidebar-about">
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<a href="https://blog.juliobiason.me"><h1>Julio Biason .Me 4.3</h1></a>
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<p class="lead">Old school dev living in a 2.0 dev world</p>
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</div>
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<li class="sidebar-nav-item"><a href="/pt">Português</a></li>
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<div class="content container">
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<div class="post">
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<h1 class="post-title">Things I Learnt The Hard Way - It's Better To Let The Application Crash Than Do Nothing</h1>
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<span class="post-date">
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2019-06-24
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<a href="https://blog.juliobiason.me/tags/books/">#books</a>
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<a href="https://blog.juliobiason.me/tags/things-i-learnt/">#things i learnt</a>
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<a href="https://blog.juliobiason.me/tags/exceptions/">#exceptions</a>
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<a href="https://blog.juliobiason.me/tags/error-handling/">#error handling</a>
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</span>
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<p>Although that sounds weird, it's better to not add any error handling than
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silently capturing errors and doing nothing.</p>
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<span id="continue-reading"></span>
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<p>For example, a (sadly common) example of Java code:</p>
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<pre data-lang="java" style="background-color:#2b303b;color:#c0c5ce;" class="language-java "><code class="language-java" data-lang="java"><span style="color:#b48ead;">try </span><span>{
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</span><span> </span><span style="color:#bf616a;">something_that_can_raise_exception</span><span>()
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</span><span>} </span><span style="color:#b48ead;">catch </span><span>(</span><span style="color:#ebcb8b;">Exception </span><span style="color:#bf616a;">ex</span><span>) {
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</span><span> </span><span style="color:#ebcb8b;">System</span><span>.out.</span><span style="color:#bf616a;">println</span><span>(ex);
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</span><span>}
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</span></code></pre>
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<p>This does nothing to deal with the exception -- besides printing it, that is.</p>
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<p>The example may be a bit bad, 'cause Java forces capturing exceptions on
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functions that throw exceptions and it forces functions to mark themselves as
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throwing exceptions if there a <code>throw</code> in them.</p>
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<p>But Python doesn't have this restriction and people <em>still</em> try to capture
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exceptions for doing absolutely nothing -- and, worse, just keep the execution
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going.</p>
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<p>If the language allows it, you should let the application crash due the lack
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of error handling -- as long as you don't have any idea on how to handle it.
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Then, when they crash, you can think of a way to deal with it, instead of
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silently capturing it and doing nothing.</p>
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<p>Also, keep in mind to not go forth and capture <em>every</em> exception/error in a
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single take -- like the example above, which will capture every exception, or
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like <code>except Exception</code> in Python. This last example actually happened to me
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when another developer added this "broad except"<sup class="footnote-reference"><a href="#1">1</a></sup> in a network code and, at
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some point, the code would get into the capture all the time. We checked every
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cable, every connection, every interface, till I noticed there was a syntax
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error in the code. In Python, syntax errors raise exceptions and, because we
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had a "capture all exceptions", we lost some pretty good time looking for the
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problem in the wrong place.</p>
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<div class="footnote-definition" id="1"><sup class="footnote-definition-label">1</sup>
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<p>As called by Pylint.</p>
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</div>
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<div>
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<div style="float:left">
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<< <a href="/books/things-i-learnt/interface-changes">Beware of Interface Changes</a>
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</div>
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<div style="float:right">
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<a href="/books/things-i-learnt/handle-it">If You Know How To Handle It, Handle It</a> >>
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</div>
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</div>
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</html>
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