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Leonid Shalupovandintellij-monorepo-bot
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25 lines
1.0 KiB
HTML
25 lines
1.0 KiB
HTML
<html>
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Reports implementations of <code>InvocationHandler</code> that do not proxy standard
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<code>Object</code> methods like <code>hashCode()</code>, <code>equals()</code>, and <code>toString()</code>.
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<p>Failing to handle these methods might cause unexpected problems upon calling them on a proxy instance.</p>
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<p><b>Example:</b></p>
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<pre><code>
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InvocationHandler myHandler = (proxy, method, params) -> {
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System.out.println("Hello World!");
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<b>return</b> null;
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};
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Runnable myProxy = (Runnable) Proxy.newProxyInstance(
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Thread.currentThread().getContextClassLoader(),
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<b>new</b> Class[] {Runnable.class}, myHandler
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);
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</code></pre>
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<p>
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This code snippet is designed to only proxy the <code>Runnable.run()</code> method.
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However, calls to any <code>Object</code> methods, like <code>hashCode()</code>, are proxied as well.
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This can lead to problems like a <code>NullPointerException</code>, for example, when adding <code>myProxy</code> to a <code>HashSet</code>.
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</p>
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<!-- tooltip end -->
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<p><small>New in 2020.2</small>
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</body>
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</html> |