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<h2 title="Class ReflectionUtils" class="title">Class ReflectionUtils</h2>
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<pre>@InterfaceAudience.Public
@InterfaceStability.Evolving
public class <span class="typeNameLabel">ReflectionUtils</span>
extends <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</a></pre>
<div class="block">General reflection utils</div>
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<td class="colOne"><code><span class="memberNameLink"><a href="../../../../org/apache/hadoop/util/ReflectionUtils.html#ReflectionUtils--">ReflectionUtils</a></span>()</code>&nbsp;</td>
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<caption><span id="t0" class="activeTableTab"><span>All Methods</span><span class="tabEnd">&nbsp;</span></span><span id="t1" class="tableTab"><span><a href="javascript:show(1);">Static Methods</a></span><span class="tabEnd">&nbsp;</span></span><span id="t4" class="tableTab"><span><a href="javascript:show(8);">Concrete Methods</a></span><span class="tabEnd">&nbsp;</span></span><span id="t6" class="tableTab"><span><a href="javascript:show(32);">Deprecated Methods</a></span><span class="tabEnd">&nbsp;</span></span></caption>
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<td class="colFirst"><code>static void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/hadoop/util/ReflectionUtils.html#cloneWritableInto-org.apache.hadoop.io.Writable-org.apache.hadoop.io.Writable-">cloneWritableInto</a></span>(<a href="../../../../org/apache/hadoop/io/Writable.html" title="interface in org.apache.hadoop.io">Writable</a>&nbsp;dst,
<a href="../../../../org/apache/hadoop/io/Writable.html" title="interface in org.apache.hadoop.io">Writable</a>&nbsp;src)</code>
<div class="block"><span class="deprecatedLabel">Deprecated.</span>&nbsp;</div>
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<td class="colFirst"><code>static &lt;T&gt;&nbsp;T</code></td>
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<div class="block">Make a copy of the writable object using serialization to a buffer</div>
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<td class="colFirst"><code>static &lt;T&gt;&nbsp;<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Class.html?is-external=true" title="class or interface in java.lang">Class</a>&lt;T&gt;</code></td>
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<td class="colFirst"><code>static <a href="https://docs.oracle.com/javase/8/docs/api/java/util/List.html?is-external=true" title="class or interface in java.util">List</a>&lt;<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/reflect/Field.html?is-external=true" title="class or interface in java.lang.reflect">Field</a>&gt;</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/hadoop/util/ReflectionUtils.html#getDeclaredFieldsIncludingInherited-java.lang.Class-">getDeclaredFieldsIncludingInherited</a></span>(<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Class.html?is-external=true" title="class or interface in java.lang">Class</a>&lt;?&gt;&nbsp;clazz)</code>
<div class="block">Gets all the declared fields of a class including fields declared in
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<td class="colFirst"><code>static <a href="https://docs.oracle.com/javase/8/docs/api/java/util/List.html?is-external=true" title="class or interface in java.util">List</a>&lt;<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/reflect/Method.html?is-external=true" title="class or interface in java.lang.reflect">Method</a>&gt;</code></td>
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<td class="colFirst"><code>static void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/hadoop/util/ReflectionUtils.html#logThreadInfo-org.slf4j.Logger-java.lang.String-long-">logThreadInfo</a></span>(org.slf4j.Logger&nbsp;log,
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<div class="block">Log the current thread stacks at INFO level.</div>
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<td class="colFirst"><code>static void</code></td>
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<div class="block">Log the current thread stacks at INFO level.</div>
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<td class="colFirst"><code>static &lt;T&gt;&nbsp;T</code></td>
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<td class="colFirst"><code>static void</code></td>
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<td class="colFirst"><code>static void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/hadoop/util/ReflectionUtils.html#setConf-java.lang.Object-org.apache.hadoop.conf.Configuration-">setConf</a></span>(<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</a>&nbsp;theObject,
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<td class="colFirst"><code>static void</code></td>
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<pre>public static&nbsp;void&nbsp;setConf(<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</a>&nbsp;theObject,
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<div class="block">Check and set 'configuration' if necessary.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>theObject</code> - object for which to set configuration</dd>
<dd><code>conf</code> - Configuration</dd>
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<div class="block">Create an object for the given class and initialize it from conf</div>
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<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>theClass</code> - class of which an object is created</dd>
<dd><code>conf</code> - Configuration</dd>
<dt><span class="returnLabel">Returns:</span></dt>
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<div class="block">Print all of the thread's information and stack traces.</div>
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<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>stream</code> - the stream to</dd>
<dd><code>title</code> - a string title for the stack trace</dd>
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<pre>public static&nbsp;void&nbsp;logThreadInfo(org.apache.commons.logging.Log&nbsp;log,
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long&nbsp;minInterval)</pre>
<div class="block">Log the current thread stacks at INFO level.</div>
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<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>log</code> - the logger that logs the stack trace</dd>
<dd><code>title</code> - a descriptive title for the call stacks</dd>
<dd><code>minInterval</code> - the minimum time from the last</dd>
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<pre>public static&nbsp;void&nbsp;logThreadInfo(org.slf4j.Logger&nbsp;log,
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long&nbsp;minInterval)</pre>
<div class="block">Log the current thread stacks at INFO level.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>log</code> - the logger that logs the stack trace</dd>
<dd><code>title</code> - a descriptive title for the call stacks</dd>
<dd><code>minInterval</code> - the minimum time from the last</dd>
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<div class="block">Return the correctly-typed <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Class.html?is-external=true" title="class or interface in java.lang"><code>Class</code></a> of the given object.</div>
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<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>o</code> - object whose correctly-typed <code>Class</code> is to be obtained</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>the correctly typed <code>Class</code> of the given object.</dd>
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<pre>public static&nbsp;&lt;T&gt;&nbsp;T&nbsp;copy(<a href="../../../../org/apache/hadoop/conf/Configuration.html" title="class in org.apache.hadoop.conf">Configuration</a>&nbsp;conf,
T&nbsp;src,
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<div class="block">Make a copy of the writable object using serialization to a buffer</div>
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<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>src</code> - the object to copy from</dd>
<dd><code>dst</code> - the object to copy into, which is destroyed</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>dst param (the copy)</dd>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code><a href="https://docs.oracle.com/javase/8/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</a></code></dd>
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<h4>cloneWritableInto</h4>
<pre><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Deprecated.html?is-external=true" title="class or interface in java.lang">@Deprecated</a>
public static&nbsp;void&nbsp;cloneWritableInto(<a href="../../../../org/apache/hadoop/io/Writable.html" title="interface in org.apache.hadoop.io">Writable</a>&nbsp;dst,
<a href="../../../../org/apache/hadoop/io/Writable.html" title="interface in org.apache.hadoop.io">Writable</a>&nbsp;src)
throws <a href="https://docs.oracle.com/javase/8/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</a></pre>
<div class="block"><span class="deprecatedLabel">Deprecated.</span>&nbsp;</div>
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<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code><a href="https://docs.oracle.com/javase/8/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</a></code></dd>
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<h4>getDeclaredFieldsIncludingInherited</h4>
<pre>public static&nbsp;<a href="https://docs.oracle.com/javase/8/docs/api/java/util/List.html?is-external=true" title="class or interface in java.util">List</a>&lt;<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/reflect/Field.html?is-external=true" title="class or interface in java.lang.reflect">Field</a>&gt;&nbsp;getDeclaredFieldsIncludingInherited(<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Class.html?is-external=true" title="class or interface in java.lang">Class</a>&lt;?&gt;&nbsp;clazz)</pre>
<div class="block">Gets all the declared fields of a class including fields declared in
superclasses.</div>
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<h4>getDeclaredMethodsIncludingInherited</h4>
<pre>public static&nbsp;<a href="https://docs.oracle.com/javase/8/docs/api/java/util/List.html?is-external=true" title="class or interface in java.util">List</a>&lt;<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/reflect/Method.html?is-external=true" title="class or interface in java.lang.reflect">Method</a>&gt;&nbsp;getDeclaredMethodsIncludingInherited(<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Class.html?is-external=true" title="class or interface in java.lang">Class</a>&lt;?&gt;&nbsp;clazz)</pre>
<div class="block">Gets all the declared methods of a class including methods declared in
superclasses.</div>
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