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    <p>//prior to edit:</p> <p>Your problem is the fact that <code>getMethod</code> looks for a <code>public</code> member.</p> <p>From the <a href="http://java.sun.com/javase/6/docs/api/java/lang/Class.html#getMethod%28java.lang.String,%20java.lang.Class...%29" rel="noreferrer"><code>Class.getMethod</code></a> (emphasis mine):</p> <blockquote> <p>Returns a <code>Method</code> object that reflects the specified <strong>public</strong> member method of the class or interface represented by this Class object</p> </blockquote> <p>So you have two options:</p> <ul> <li>Make <code>public void foo(String... s)</code> and use <code>getMethod</code></li> <li>Use <code>getDeclaredMethod</code> instead</li> </ul> <p>Note that the same difference exists for <code>getField/s</code> vs <code>getDeclaredField/s</code> and <code>getConstructor/s</code> vs <code>getDeclaredConstructor/s</code>.</p> <hr> <p>//<code>invoke</code> problem</p> <p>This is particularly nasty, but what happens is that <code>invoke(Object obj, Object... args)</code> makes it tricky if you need to pass an array of reference type as an only argument, because it is cast-able to <code>Object[]</code>, even though it should be wrapped inside a <code>new Object[1]</code> instead.</p> <p>You can do:</p> <pre><code>m.invoke(this, new Object[] {a}); // Bohzo's solution </code></pre> <p>This bypasses the vararg mechanism. More succinctly you can also do:</p> <pre><code>m.invoke(this, (Object) a); </code></pre> <p>The cast to <code>Object</code> makes the vararg mechanism do the work of creating the array for you.</p> <p>The trick is also needed when passing a <code>null</code> as an argument to varargs, and has nothing to do with reflection.</p> <pre><code>public void foo(String... ss) { System.out.println(ss[0]); } foo(null); // causes NullPointerException foo((String) null); // prints "null" </code></pre>
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    1. POHow to work with varargs and reflection
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    1. USpolygenelubricants
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    1. CO+1, nice for this cast thing
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    2. CO@polygenelubricants, my case is: void foo() function has argument Param... param (Hint: Param is generic type) instead of String... s. I used new Object[] {new URL("google.com")}, but get the following error: IllegalArgumentException: argument 1 should have type java.lang.Object[], got java.net.URL. Thank you in advance.
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