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    <p>The first argument of the <a href="http://java.sun.com/javase/6/docs/api/java/lang/reflect/Field.html#set(java.lang.Object,%20java.lang.Object)" rel="nofollow noreferrer"><code>Field.set</code></a> method should be the object which you are reflecting on.</p> <pre><code>decfields[0].set("msg", "success"); </code></pre> <p>Should read:</p> <pre><code>decfields[0].set(test, "success"); </code></pre> <p>Furthermore, the final <code>System.out.println</code> call should refer to the <code>test</code> object rather than the class <code>ColinTest</code>, as I presume the intention is to output the contents of the <code>test.msg</code> field.</p> <p><strong>Update</strong></p> <p>As pointed out by <a href="https://stackoverflow.com/questions/919962/illegalargumentexception-when-setting-public-member/919986#919986">toolkit</a> and <a href="https://stackoverflow.com/questions/919962/illegalargumentexception-when-setting-public-member/919985#919985">Chris</a>, the <a href="http://java.sun.com/javase/6/docs/api/java/lang/Class.html#getDeclaredField(java.lang.String)" rel="nofollow noreferrer"><code>Class.getDeclaredField</code></a> method can be used to specify the name of the field in order to retrieve it:</p> <pre><code>Field msgField = test.getClass().getDeclaredField("msg"); // or alternatively: Field msgField = ColinTest.class.getDeclaredField("msg"); </code></pre> <p>Then, the <code>set</code> method of the <code>msgField</code> can be invoked as:</p> <pre><code>msgField.set(test, "success"); </code></pre> <p>This way has its benefit, as already pointed out by toolkit, if there are more fields added to the object, the order of the fields that are returned by <code>Class.getDeclaredFields</code> may not necessarily return the field <code>msg</code> as the first element of the array. Depending on the order of the returned array to be a certain way may cause problems when changes are made to the class.</p> <p>Therefore, it would probably be a better idea to use <code>getDeclaredField</code> and declare the name of the desired field.</p>
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