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| <div class="subTitle">org.apache.hadoop.util</div> |
| <h2 title="Class FindClass" class="title">Class FindClass</h2> |
| </div> |
| <div class="contentContainer"> |
| <ul class="inheritance"> |
| <li><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">java.lang.Object</a></li> |
| <li> |
| <ul class="inheritance"> |
| <li><a href="../../../../org/apache/hadoop/conf/Configured.html" title="class in org.apache.hadoop.conf">org.apache.hadoop.conf.Configured</a></li> |
| <li> |
| <ul class="inheritance"> |
| <li>org.apache.hadoop.util.FindClass</li> |
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| <br> |
| <pre>public final class <span class="typeNameLabel">FindClass</span> |
| extends <a href="../../../../org/apache/hadoop/conf/Configured.html" title="class in org.apache.hadoop.conf">Configured</a> |
| implements <a href="../../../../org/apache/hadoop/util/Tool.html" title="interface in org.apache.hadoop.util">Tool</a></pre> |
| <div class="block">This entry point exists for diagnosing classloader problems: |
| is a class or resource present -and if so, where? |
| |
| <p> |
| Actions |
| <br> |
| <ul> |
| <li><pre>load</pre>: load a class but do not attempt to create it </li> |
| <li><pre>create</pre>: load and create a class, print its string value</li> |
| <li><pre>printresource</pre>: load a resource then print it to stdout</li> |
| <li><pre>resource</pre>: load a resource then print the URL of that |
| resource</li> |
| </ul> |
| |
| It returns an error code if a class/resource cannot be loaded/found |
| -and optionally a class may be requested as being loaded. |
| The latter action will call the class's constructor -it must support an |
| empty constructor); any side effects from the |
| constructor or static initializers will take place. |
| |
| All error messages are printed to <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/System.html?is-external=true#out" title="class or interface in java.lang"><code>System.out</code></a>; errors |
| to <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/System.html?is-external=true#err" title="class or interface in java.lang"><code>System.err</code></a>.</div> |
| </li> |
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| <ul class="blockList"> |
| <li class="blockList"> |
| <!-- =========== FIELD SUMMARY =========== --> |
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| <h3>Field Summary</h3> |
| <table class="memberSummary" border="0" cellpadding="3" cellspacing="0" summary="Field Summary table, listing fields, and an explanation"> |
| <caption><span>Fields</span><span class="tabEnd"> </span></caption> |
| <tr> |
| <th class="colFirst" scope="col">Modifier and Type</th> |
| <th class="colLast" scope="col">Field and Description</th> |
| </tr> |
| <tr class="altColor"> |
| <td class="colFirst"><code>static <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/hadoop/util/FindClass.html#A_CREATE">A_CREATE</a></span></code> |
| <div class="block">create command: "create"</div> |
| </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colFirst"><code>static <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/hadoop/util/FindClass.html#A_LOAD">A_LOAD</a></span></code> |
| <div class="block">Load command: "load"</div> |
| </td> |
| </tr> |
| <tr class="altColor"> |
| <td class="colFirst"><code>static <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/hadoop/util/FindClass.html#A_PRINTRESOURCE">A_PRINTRESOURCE</a></span></code> |
| <div class="block">Command to locate and print a resource: "print"</div> |
| </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colFirst"><code>static <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/hadoop/util/FindClass.html#A_RESOURCE">A_RESOURCE</a></span></code> |
| <div class="block">Command to locate a resource: "locate"</div> |
| </td> |
| </tr> |
| <tr class="altColor"> |
| <td class="colFirst"><code>protected static int</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/hadoop/util/FindClass.html#E_CREATE_FAILED">E_CREATE_FAILED</a></span></code> |
| <div class="block">class creation failed 5</div> |
| </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colFirst"><code>protected static int</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/hadoop/util/FindClass.html#E_GENERIC">E_GENERIC</a></span></code> |
| <div class="block">generic error 1</div> |
| </td> |
| </tr> |
| <tr class="altColor"> |
| <td class="colFirst"><code>protected static int</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/hadoop/util/FindClass.html#E_LOAD_FAILED">E_LOAD_FAILED</a></span></code> |
| <div class="block">class load failed 4</div> |
| </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colFirst"><code>protected static int</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/hadoop/util/FindClass.html#E_NOT_FOUND">E_NOT_FOUND</a></span></code> |
| <div class="block">class or resource not found 3</div> |
| </td> |
| </tr> |
| <tr class="altColor"> |
| <td class="colFirst"><code>protected static int</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/hadoop/util/FindClass.html#E_USAGE">E_USAGE</a></span></code> |
| <div class="block">usage error -bad arguments or similar 2</div> |
| </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colFirst"><code>static int</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/hadoop/util/FindClass.html#SUCCESS">SUCCESS</a></span></code> |
| <div class="block">Exit code when the operation succeeded: 0</div> |
| </td> |
| </tr> |
| </table> |
| </li> |
| </ul> |
| <!-- ======== CONSTRUCTOR SUMMARY ======== --> |
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| </a> |
| <h3>Constructor Summary</h3> |
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| <caption><span>Constructors</span><span class="tabEnd"> </span></caption> |
| <tr> |
| <th class="colOne" scope="col">Constructor and Description</th> |
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| <tr class="altColor"> |
| <td class="colOne"><code><span class="memberNameLink"><a href="../../../../org/apache/hadoop/util/FindClass.html#FindClass--">FindClass</a></span>()</code> |
| <div class="block">Empty constructor; passes a new Configuration |
| object instance to its superclass's constructor</div> |
| </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colOne"><code><span class="memberNameLink"><a href="../../../../org/apache/hadoop/util/FindClass.html#FindClass-org.apache.hadoop.conf.Configuration-">FindClass</a></span>(<a href="../../../../org/apache/hadoop/conf/Configuration.html" title="class in org.apache.hadoop.conf">Configuration</a> conf)</code> |
| <div class="block">Create a class with a specified configuration</div> |
| </td> |
| </tr> |
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| </li> |
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| <h3>Method Summary</h3> |
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| <caption><span id="t0" class="activeTableTab"><span>All Methods</span><span class="tabEnd"> </span></span><span id="t1" class="tableTab"><span><a href="javascript:show(1);">Static Methods</a></span><span class="tabEnd"> </span></span><span id="t2" class="tableTab"><span><a href="javascript:show(2);">Instance Methods</a></span><span class="tabEnd"> </span></span><span id="t4" class="tableTab"><span><a href="javascript:show(8);">Concrete Methods</a></span><span class="tabEnd"> </span></span></caption> |
| <tr> |
| <th class="colFirst" scope="col">Modifier and Type</th> |
| <th class="colLast" scope="col">Method and Description</th> |
| </tr> |
| <tr id="i0" class="altColor"> |
| <td class="colFirst"><code>static void</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/hadoop/util/FindClass.html#main-java.lang.String:A-">main</a></span>(<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a>[] args)</code> |
| <div class="block">Main entry point.</div> |
| </td> |
| </tr> |
| <tr id="i1" class="rowColor"> |
| <td class="colFirst"><code>int</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/hadoop/util/FindClass.html#run-java.lang.String:A-">run</a></span>(<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a>[] args)</code> |
| <div class="block">Run the class/resource find or load operation</div> |
| </td> |
| </tr> |
| <tr id="i2" class="altColor"> |
| <td class="colFirst"><code>static void</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/hadoop/util/FindClass.html#setOutputStreams-java.io.PrintStream-java.io.PrintStream-">setOutputStreams</a></span>(<a href="https://docs.oracle.com/javase/8/docs/api/java/io/PrintStream.html?is-external=true" title="class or interface in java.io">PrintStream</a> out, |
| <a href="https://docs.oracle.com/javase/8/docs/api/java/io/PrintStream.html?is-external=true" title="class or interface in java.io">PrintStream</a> err)</code> |
| <div class="block">Change the output streams to be something other than the |
| System.out and System.err streams</div> |
| </td> |
| </tr> |
| </table> |
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| <h3>Methods inherited from class org.apache.hadoop.conf.<a href="../../../../org/apache/hadoop/conf/Configured.html" title="class in org.apache.hadoop.conf">Configured</a></h3> |
| <code><a href="../../../../org/apache/hadoop/conf/Configured.html#getConf--">getConf</a>, <a href="../../../../org/apache/hadoop/conf/Configured.html#setConf-org.apache.hadoop.conf.Configuration-">setConf</a></code></li> |
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| <h3>Methods inherited from class java.lang.<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></h3> |
| <code><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#clone--" title="class or interface in java.lang">clone</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#equals-java.lang.Object-" title="class or interface in java.lang">equals</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#finalize--" title="class or interface in java.lang">finalize</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#getClass--" title="class or interface in java.lang">getClass</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#hashCode--" title="class or interface in java.lang">hashCode</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#notify--" title="class or interface in java.lang">notify</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#notifyAll--" title="class or interface in java.lang">notifyAll</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#toString--" title="class or interface in java.lang">toString</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#wait--" title="class or interface in java.lang">wait</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#wait-long-" title="class or interface in java.lang">wait</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#wait-long-int-" title="class or interface in java.lang">wait</a></code></li> |
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| </a> |
| <h3>Methods inherited from interface org.apache.hadoop.conf.<a href="../../../../org/apache/hadoop/conf/Configurable.html" title="interface in org.apache.hadoop.conf">Configurable</a></h3> |
| <code><a href="../../../../org/apache/hadoop/conf/Configurable.html#getConf--">getConf</a>, <a href="../../../../org/apache/hadoop/conf/Configurable.html#setConf-org.apache.hadoop.conf.Configuration-">setConf</a></code></li> |
| </ul> |
| </li> |
| </ul> |
| </li> |
| </ul> |
| </div> |
| <div class="details"> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <!-- ============ FIELD DETAIL =========== --> |
| <ul class="blockList"> |
| <li class="blockList"><a name="field.detail"> |
| <!-- --> |
| </a> |
| <h3>Field Detail</h3> |
| <a name="A_CREATE"> |
| <!-- --> |
| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>A_CREATE</h4> |
| <pre>public static final <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a> A_CREATE</pre> |
| <div class="block">create command: "create"</div> |
| <dl> |
| <dt><span class="seeLabel">See Also:</span></dt> |
| <dd><a href="../../../../constant-values.html#org.apache.hadoop.util.FindClass.A_CREATE">Constant Field Values</a></dd> |
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| <h4>A_LOAD</h4> |
| <pre>public static final <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a> A_LOAD</pre> |
| <div class="block">Load command: "load"</div> |
| <dl> |
| <dt><span class="seeLabel">See Also:</span></dt> |
| <dd><a href="../../../../constant-values.html#org.apache.hadoop.util.FindClass.A_LOAD">Constant Field Values</a></dd> |
| </dl> |
| </li> |
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| <a name="A_RESOURCE"> |
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| <ul class="blockList"> |
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| <h4>A_RESOURCE</h4> |
| <pre>public static final <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a> A_RESOURCE</pre> |
| <div class="block">Command to locate a resource: "locate"</div> |
| <dl> |
| <dt><span class="seeLabel">See Also:</span></dt> |
| <dd><a href="../../../../constant-values.html#org.apache.hadoop.util.FindClass.A_RESOURCE">Constant Field Values</a></dd> |
| </dl> |
| </li> |
| </ul> |
| <a name="A_PRINTRESOURCE"> |
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| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>A_PRINTRESOURCE</h4> |
| <pre>public static final <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a> A_PRINTRESOURCE</pre> |
| <div class="block">Command to locate and print a resource: "print"</div> |
| <dl> |
| <dt><span class="seeLabel">See Also:</span></dt> |
| <dd><a href="../../../../constant-values.html#org.apache.hadoop.util.FindClass.A_PRINTRESOURCE">Constant Field Values</a></dd> |
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| <h4>SUCCESS</h4> |
| <pre>public static final int SUCCESS</pre> |
| <div class="block">Exit code when the operation succeeded: 0</div> |
| <dl> |
| <dt><span class="seeLabel">See Also:</span></dt> |
| <dd><a href="../../../../constant-values.html#org.apache.hadoop.util.FindClass.SUCCESS">Constant Field Values</a></dd> |
| </dl> |
| </li> |
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| <a name="E_GENERIC"> |
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| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>E_GENERIC</h4> |
| <pre>protected static final int E_GENERIC</pre> |
| <div class="block">generic error 1</div> |
| <dl> |
| <dt><span class="seeLabel">See Also:</span></dt> |
| <dd><a href="../../../../constant-values.html#org.apache.hadoop.util.FindClass.E_GENERIC">Constant Field Values</a></dd> |
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| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>E_USAGE</h4> |
| <pre>protected static final int E_USAGE</pre> |
| <div class="block">usage error -bad arguments or similar 2</div> |
| <dl> |
| <dt><span class="seeLabel">See Also:</span></dt> |
| <dd><a href="../../../../constant-values.html#org.apache.hadoop.util.FindClass.E_USAGE">Constant Field Values</a></dd> |
| </dl> |
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| <a name="E_NOT_FOUND"> |
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| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>E_NOT_FOUND</h4> |
| <pre>protected static final int E_NOT_FOUND</pre> |
| <div class="block">class or resource not found 3</div> |
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| <pre>public FindClass()</pre> |
| <div class="block">Empty constructor; passes a new Configuration |
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| <pre>public FindClass(<a href="../../../../org/apache/hadoop/conf/Configuration.html" title="class in org.apache.hadoop.conf">Configuration</a> conf)</pre> |
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