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<div class="subTitle">org.apache.tools.ant.util</div>
<h2 title="Class JavaEnvUtils" class="title">Class JavaEnvUtils</h2>
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<ul class="inheritance">
<li>java.lang.Object</li>
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<ul class="inheritance">
<li>org.apache.tools.ant.util.JavaEnvUtils</li>
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<pre>public final class <span class="strong">JavaEnvUtils</span>
extends java.lang.Object</pre>
<div class="block">A set of helper methods related to locating executables or checking
 conditons of a given Java installation.</div>
<dl><dt><span class="strong">Since:</span></dt>
  <dd>Ant 1.5</dd></dl>
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<h3>Field Summary</h3>
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<caption><span>Fields</span><span class="tabEnd">&nbsp;</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 java.lang.String</code></td>
<td class="colLast"><code><strong><a href="../../../../../org/apache/tools/ant/util/JavaEnvUtils.html#JAVA_1_0">JAVA_1_0</a></strong></code>
<div class="block">Version constant for Java 1.0</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>static java.lang.String</code></td>
<td class="colLast"><code><strong><a href="../../../../../org/apache/tools/ant/util/JavaEnvUtils.html#JAVA_1_1">JAVA_1_1</a></strong></code>
<div class="block">Version constant for Java 1.1</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code>static java.lang.String</code></td>
<td class="colLast"><code><strong><a href="../../../../../org/apache/tools/ant/util/JavaEnvUtils.html#JAVA_1_2">JAVA_1_2</a></strong></code>
<div class="block">Version constant for Java 1.2</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>static java.lang.String</code></td>
<td class="colLast"><code><strong><a href="../../../../../org/apache/tools/ant/util/JavaEnvUtils.html#JAVA_1_3">JAVA_1_3</a></strong></code>
<div class="block">Version constant for Java 1.3</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code>static java.lang.String</code></td>
<td class="colLast"><code><strong><a href="../../../../../org/apache/tools/ant/util/JavaEnvUtils.html#JAVA_1_4">JAVA_1_4</a></strong></code>
<div class="block">Version constant for Java 1.4</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>static java.lang.String</code></td>
<td class="colLast"><code><strong><a href="../../../../../org/apache/tools/ant/util/JavaEnvUtils.html#JAVA_1_5">JAVA_1_5</a></strong></code>
<div class="block">Version constant for Java 1.5</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code>static java.lang.String</code></td>
<td class="colLast"><code><strong><a href="../../../../../org/apache/tools/ant/util/JavaEnvUtils.html#JAVA_1_6">JAVA_1_6</a></strong></code>
<div class="block">Version constant for Java 1.6</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>static java.lang.String</code></td>
<td class="colLast"><code><strong><a href="../../../../../org/apache/tools/ant/util/JavaEnvUtils.html#JAVA_1_7">JAVA_1_7</a></strong></code>
<div class="block">Version constant for Java 1.7</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code>static java.lang.String</code></td>
<td class="colLast"><code><strong><a href="../../../../../org/apache/tools/ant/util/JavaEnvUtils.html#JAVA_1_8">JAVA_1_8</a></strong></code>
<div class="block">Version constant for Java 1.8</div>
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<td class="colFirst"><code>static int</code></td>
<td class="colLast"><code><strong><a href="../../../../../org/apache/tools/ant/util/JavaEnvUtils.html#VERSION_1_0">VERSION_1_0</a></strong></code>
<div class="block">Number Version constant for Java 1.0</div>
</td>
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<tr class="altColor">
<td class="colFirst"><code>static int</code></td>
<td class="colLast"><code><strong><a href="../../../../../org/apache/tools/ant/util/JavaEnvUtils.html#VERSION_1_1">VERSION_1_1</a></strong></code>
<div class="block">Number Version constant for Java 1.1</div>
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<td class="colFirst"><code>static int</code></td>
<td class="colLast"><code><strong><a href="../../../../../org/apache/tools/ant/util/JavaEnvUtils.html#VERSION_1_2">VERSION_1_2</a></strong></code>
<div class="block">Number Version constant for Java 1.2</div>
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<td class="colFirst"><code>static int</code></td>
<td class="colLast"><code><strong><a href="../../../../../org/apache/tools/ant/util/JavaEnvUtils.html#VERSION_1_3">VERSION_1_3</a></strong></code>
<div class="block">Number Version constant for Java 1.3</div>
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<tr class="rowColor">
<td class="colFirst"><code>static int</code></td>
<td class="colLast"><code><strong><a href="../../../../../org/apache/tools/ant/util/JavaEnvUtils.html#VERSION_1_4">VERSION_1_4</a></strong></code>
<div class="block">Number Version constant for Java 1.4</div>
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<tr class="altColor">
<td class="colFirst"><code>static int</code></td>
<td class="colLast"><code><strong><a href="../../../../../org/apache/tools/ant/util/JavaEnvUtils.html#VERSION_1_5">VERSION_1_5</a></strong></code>
<div class="block">Number Version constant for Java 1.5</div>
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<tr class="rowColor">
<td class="colFirst"><code>static int</code></td>
<td class="colLast"><code><strong><a href="../../../../../org/apache/tools/ant/util/JavaEnvUtils.html#VERSION_1_6">VERSION_1_6</a></strong></code>
<div class="block">Number Version constant for Java 1.6</div>
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<td class="colFirst"><code>static int</code></td>
<td class="colLast"><code><strong><a href="../../../../../org/apache/tools/ant/util/JavaEnvUtils.html#VERSION_1_7">VERSION_1_7</a></strong></code>
<div class="block">Number Version constant for Java 1.7</div>
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<td class="colFirst"><code>static int</code></td>
<td class="colLast"><code><strong><a href="../../../../../org/apache/tools/ant/util/JavaEnvUtils.html#VERSION_1_8">VERSION_1_8</a></strong></code>
<div class="block">Number Version constant for Java 1.8</div>
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<th class="colFirst" scope="col">Modifier and Type</th>
<th class="colLast" scope="col">Method and Description</th>
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<td class="colFirst"><code>static java.io.File</code></td>
<td class="colLast"><code><strong><a href="../../../../../org/apache/tools/ant/util/JavaEnvUtils.html#createVmsJavaOptionFile(java.lang.String[])">createVmsJavaOptionFile</a></strong>(java.lang.String[]&nbsp;cmd)</code>
<div class="block">Writes the command into a temporary DCL script and returns the
 corresponding File object.</div>
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<td class="colFirst"><code>static java.lang.String</code></td>
<td class="colLast"><code><strong><a href="../../../../../org/apache/tools/ant/util/JavaEnvUtils.html#getJavaHome()">getJavaHome</a></strong>()</code>
<div class="block">Return the value of ${java.home}</div>
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<td class="colFirst"><code>static java.lang.String</code></td>
<td class="colLast"><code><strong><a href="../../../../../org/apache/tools/ant/util/JavaEnvUtils.html#getJavaVersion()">getJavaVersion</a></strong>()</code>
<div class="block">Returns the version of Java this class is running under.</div>
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<td class="colFirst"><code>static int</code></td>
<td class="colLast"><code><strong><a href="../../../../../org/apache/tools/ant/util/JavaEnvUtils.html#getJavaVersionNumber()">getJavaVersionNumber</a></strong>()</code>
<div class="block">Returns the version of Java this class is running under.</div>
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<td class="colFirst"><code>static java.lang.String</code></td>
<td class="colLast"><code><strong><a href="../../../../../org/apache/tools/ant/util/JavaEnvUtils.html#getJdkExecutable(java.lang.String)">getJdkExecutable</a></strong>(java.lang.String&nbsp;command)</code>
<div class="block">Finds an executable that is part of a JDK installation based on
 the java.home system property.</div>
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</tr>
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<td class="colFirst"><code>static java.lang.String</code></td>
<td class="colLast"><code><strong><a href="../../../../../org/apache/tools/ant/util/JavaEnvUtils.html#getJreExecutable(java.lang.String)">getJreExecutable</a></strong>(java.lang.String&nbsp;command)</code>
<div class="block">Finds an executable that is part of a JRE installation based on
 the java.home system property.</div>
</td>
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<td class="colFirst"><code>static java.util.Vector</code></td>
<td class="colLast"><code><strong><a href="../../../../../org/apache/tools/ant/util/JavaEnvUtils.html#getJrePackages()">getJrePackages</a></strong>()</code>
<div class="block">get a vector of strings of packages built into
 that platforms runtime jar(s)</div>
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<td class="colFirst"><code>static java.util.Vector</code></td>
<td class="colLast"><code><strong><a href="../../../../../org/apache/tools/ant/util/JavaEnvUtils.html#getJrePackageTestCases()">getJrePackageTestCases</a></strong>()</code>
<div class="block">Testing helper method; kept here for unification of changes.</div>
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<td class="colFirst"><code>static boolean</code></td>
<td class="colLast"><code><strong><a href="../../../../../org/apache/tools/ant/util/JavaEnvUtils.html#isApacheHarmony()">isApacheHarmony</a></strong>()</code>
<div class="block">Checks whether the current VM is Apache Harmony.</div>
</td>
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<td class="colFirst"><code>static boolean</code></td>
<td class="colLast"><code><strong><a href="../../../../../org/apache/tools/ant/util/JavaEnvUtils.html#isAtLeastJavaVersion(java.lang.String)">isAtLeastJavaVersion</a></strong>(java.lang.String&nbsp;version)</code>
<div class="block">Compares the current Java version to the passed in String -
 assumes the argument is one of the constants defined in this
 class.</div>
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<td class="colFirst"><code>static boolean</code></td>
<td class="colLast"><code><strong><a href="../../../../../org/apache/tools/ant/util/JavaEnvUtils.html#isGij()">isGij</a></strong>()</code>
<div class="block">Checks whether the current Java VM is the GNU interpreter gij
 or we are running in a gcj precompiled binary.</div>
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<td class="colFirst"><code>static boolean</code></td>
<td class="colLast"><code><strong><a href="../../../../../org/apache/tools/ant/util/JavaEnvUtils.html#isJavaVersion(java.lang.String)">isJavaVersion</a></strong>(java.lang.String&nbsp;version)</code>
<div class="block">Compares the current Java version to the passed in String -
 assumes the argument is one of the constants defined in this
 class.</div>
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<td class="colFirst"><code>static boolean</code></td>
<td class="colLast"><code><strong><a href="../../../../../org/apache/tools/ant/util/JavaEnvUtils.html#isKaffe()">isKaffe</a></strong>()</code>
<div class="block">Checks whether the current Java VM is Kaffe.</div>
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<h3>Methods inherited from class&nbsp;java.lang.Object</h3>
<code>clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait</code></li>
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<pre>public static final&nbsp;java.lang.String JAVA_1_0</pre>
<div class="block">Version constant for Java 1.0</div>
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<pre>public static final&nbsp;int VERSION_1_0</pre>
<div class="block">Number Version constant for Java 1.0</div>
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<pre>public static final&nbsp;java.lang.String JAVA_1_1</pre>
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<pre>public static final&nbsp;int VERSION_1_1</pre>
<div class="block">Number Version constant for Java 1.1</div>
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<pre>public static final&nbsp;java.lang.String JAVA_1_2</pre>
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<pre>public static final&nbsp;int VERSION_1_2</pre>
<div class="block">Number Version constant for Java 1.2</div>
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<pre>public static final&nbsp;int VERSION_1_3</pre>
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<pre>public static final&nbsp;int VERSION_1_4</pre>
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<pre>public static final&nbsp;java.lang.String JAVA_1_5</pre>
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<pre>public static final&nbsp;int VERSION_1_5</pre>
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<pre>public static final&nbsp;java.lang.String JAVA_1_6</pre>
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<pre>public static final&nbsp;int VERSION_1_6</pre>
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<pre>public static final&nbsp;java.lang.String JAVA_1_7</pre>
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<pre>public static final&nbsp;int VERSION_1_7</pre>
<div class="block">Number Version constant for Java 1.7</div>
<dl><dt><span class="strong">See Also:</span></dt><dd><a href="../../../../../constant-values.html#org.apache.tools.ant.util.JavaEnvUtils.VERSION_1_7">Constant Field Values</a></dd></dl>
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<pre>public static final&nbsp;java.lang.String JAVA_1_8</pre>
<div class="block">Version constant for Java 1.8</div>
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<pre>public static final&nbsp;int VERSION_1_8</pre>
<div class="block">Number Version constant for Java 1.8</div>
<dl><dt><span class="strong">See Also:</span></dt><dd><a href="../../../../../constant-values.html#org.apache.tools.ant.util.JavaEnvUtils.VERSION_1_8">Constant Field Values</a></dd></dl>
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<pre>public static&nbsp;java.lang.String&nbsp;getJavaVersion()</pre>
<div class="block">Returns the version of Java this class is running under.</div>
<dl><dt><span class="strong">Returns:</span></dt><dd>the version of Java as a String, e.g. "1.6"</dd></dl>
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<pre>public static&nbsp;int&nbsp;getJavaVersionNumber()</pre>
<div class="block">Returns the version of Java this class is running under.
 This number can be used for comparisions; it will always be</div>
<dl><dt><span class="strong">Returns:</span></dt><dd>the version of Java as a number 10x the major/minor,
 e.g Java1.5 has a value of 15</dd></dl>
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<pre>public static&nbsp;boolean&nbsp;isJavaVersion(java.lang.String&nbsp;version)</pre>
<div class="block">Compares the current Java version to the passed in String -
 assumes the argument is one of the constants defined in this
 class.
 Note that Ant now requires JDK 1.4+ so <a href="../../../../../org/apache/tools/ant/util/JavaEnvUtils.html#JAVA_1_0"><code>JAVA_1_0</code></a> through
 <a href="../../../../../org/apache/tools/ant/util/JavaEnvUtils.html#JAVA_1_3"><code>JAVA_1_3</code></a> need no longer be tested for.</div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>version</code> - the version to check against the current version.</dd>
<dt><span class="strong">Returns:</span></dt><dd>true if the version of Java is the same as the given version.</dd><dt><span class="strong">Since:</span></dt>
  <dd>Ant 1.5</dd></dl>
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<pre>public static&nbsp;boolean&nbsp;isAtLeastJavaVersion(java.lang.String&nbsp;version)</pre>
<div class="block">Compares the current Java version to the passed in String -
 assumes the argument is one of the constants defined in this
 class.
 Note that Ant now requires JDK 1.4+ so <a href="../../../../../org/apache/tools/ant/util/JavaEnvUtils.html#JAVA_1_0"><code>JAVA_1_0</code></a> through
 <a href="../../../../../org/apache/tools/ant/util/JavaEnvUtils.html#JAVA_1_3"><code>JAVA_1_3</code></a> need no longer be tested for.</div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>version</code> - the version to check against the current version.</dd>
<dt><span class="strong">Returns:</span></dt><dd>true if the version of Java is the same or higher than the
 given version.</dd><dt><span class="strong">Since:</span></dt>
  <dd>Ant 1.7</dd></dl>
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<pre>public static&nbsp;boolean&nbsp;isKaffe()</pre>
<div class="block">Checks whether the current Java VM is Kaffe.</div>
<dl><dt><span class="strong">Returns:</span></dt><dd>true if the current Java VM is Kaffe.</dd><dt><span class="strong">Since:</span></dt>
  <dd>Ant 1.6.3</dd>
<dt><span class="strong">See Also:</span></dt><dd><a href="http://www.kaffe.org/">http://www.kaffe.org/</a></dd></dl>
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<pre>public static&nbsp;boolean&nbsp;isGij()</pre>
<div class="block">Checks whether the current Java VM is the GNU interpreter gij
 or we are running in a gcj precompiled binary.</div>
<dl><dt><span class="strong">Returns:</span></dt><dd>true if the current Java VM is gcj/gij.</dd><dt><span class="strong">Since:</span></dt>
  <dd>Ant 1.8.2</dd></dl>
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<pre>public static&nbsp;boolean&nbsp;isApacheHarmony()</pre>
<div class="block">Checks whether the current VM is Apache Harmony.</div>
<dl><dt><span class="strong">Returns:</span></dt><dd>true if the current VM is Apache Harmony.</dd><dt><span class="strong">Since:</span></dt>
  <dd>Ant 1.8.2</dd></dl>
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<pre>public static&nbsp;java.lang.String&nbsp;getJreExecutable(java.lang.String&nbsp;command)</pre>
<div class="block">Finds an executable that is part of a JRE installation based on
 the java.home system property.

 <p><code>java</code>, <code>keytool</code>,
 <code>policytool</code>, <code>orbd</code>, <code>rmid</code>,
 <code>rmiregistry</code>, <code>servertool</code> and
 <code>tnameserv</code> are JRE executables on Sun based
 JRE's.</p>

 <p>You typically find them in <code>JAVA_HOME/jre/bin</code> if
 <code>JAVA_HOME</code> points to your JDK installation.  JDK
 &lt; 1.2 has them in the same directory as the JDK
 executables.</p></div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>command</code> - the java executable to find.</dd>
<dt><span class="strong">Returns:</span></dt><dd>the path to the command.</dd><dt><span class="strong">Since:</span></dt>
  <dd>Ant 1.5</dd></dl>
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<pre>public static&nbsp;java.lang.String&nbsp;getJdkExecutable(java.lang.String&nbsp;command)</pre>
<div class="block">Finds an executable that is part of a JDK installation based on
 the java.home system property.

 <p>You typically find them in <code>JAVA_HOME/bin</code> if
 <code>JAVA_HOME</code> points to your JDK installation.</p></div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>command</code> - the java executable to find.</dd>
<dt><span class="strong">Returns:</span></dt><dd>the path to the command.</dd><dt><span class="strong">Since:</span></dt>
  <dd>Ant 1.5</dd></dl>
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<pre>public static&nbsp;java.util.Vector&nbsp;getJrePackageTestCases()</pre>
<div class="block">Testing helper method; kept here for unification of changes.</div>
<dl><dt><span class="strong">Returns:</span></dt><dd>a list of test classes depending on the java version.</dd></dl>
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<pre>public static&nbsp;java.util.Vector&nbsp;getJrePackages()</pre>
<div class="block">get a vector of strings of packages built into
 that platforms runtime jar(s)</div>
<dl><dt><span class="strong">Returns:</span></dt><dd>list of packages.</dd></dl>
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<pre>public static&nbsp;java.io.File&nbsp;createVmsJavaOptionFile(java.lang.String[]&nbsp;cmd)
                                            throws java.io.IOException</pre>
<div class="block">Writes the command into a temporary DCL script and returns the
 corresponding File object.
 It is the job of the caller to delete the file on exit.</div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>cmd</code> - the command.</dd>
<dt><span class="strong">Returns:</span></dt><dd>the file containing the command.</dd>
<dt><span class="strong">Throws:</span></dt>
<dd><code>java.io.IOException</code> - if there is an error writing to the file.</dd></dl>
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<pre>public static&nbsp;java.lang.String&nbsp;getJavaHome()</pre>
<div class="block">Return the value of ${java.home}</div>
<dl><dt><span class="strong">Returns:</span></dt><dd>the java home value.</dd></dl>
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