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  <section id="findjava">
<span id="module:FindJava"></span><h1>FindJava<a class="headerlink" href="#findjava" title="Permalink to this heading">ΒΆ</a></h1>
<p>Find Java</p>
<p>This module finds if Java is installed and determines where the
include files and libraries are.  The caller may set variable <code class="docutils literal notranslate"><span class="pre">JAVA_HOME</span></code>
to specify a Java installation prefix explicitly.</p>
<p>See also the <span class="target" id="index-0-module:FindJNI"></span><a class="reference internal" href="FindJNI.html#module:FindJNI" title="FindJNI"><code class="xref cmake cmake-module docutils literal notranslate"><span class="pre">FindJNI</span></code></a> module to find Java Native Interface (JNI).</p>
<div class="versionadded">
<p><span class="versionmodified added">New in version 3.10: </span>Added support for Java 9+ version parsing.</p>
</div>
<p>Specify one or more of the following components as you call this find module. See example below.</p>
<div class="highlight-none notranslate"><div class="highlight"><pre><span></span>Runtime     = Java Runtime Environment used to execute Java byte-compiled applications
Development = Development tools (java, javac, javah, jar and javadoc), includes Runtime component
IdlJ        = Interface Description Language (IDL) to Java compiler
JarSigner   = Signer and verifier tool for Java Archive (JAR) files
</pre></div>
</div>
<p>This module sets the following result variables:</p>
<div class="highlight-none notranslate"><div class="highlight"><pre><span></span>Java_JAVA_EXECUTABLE      = the full path to the Java runtime
Java_JAVAC_EXECUTABLE     = the full path to the Java compiler
Java_JAVAH_EXECUTABLE     = the full path to the Java header generator
Java_JAVADOC_EXECUTABLE   = the full path to the Java documentation generator
Java_IDLJ_EXECUTABLE      = the full path to the Java idl compiler
Java_JAR_EXECUTABLE       = the full path to the Java archiver
Java_JARSIGNER_EXECUTABLE = the full path to the Java jar signer
Java_VERSION_STRING       = Version of java found, eg. 1.6.0_12
Java_VERSION_MAJOR        = The major version of the package found.
Java_VERSION_MINOR        = The minor version of the package found.
Java_VERSION_PATCH        = The patch version of the package found.
Java_VERSION_TWEAK        = The tweak version of the package found (after &#39;_&#39;)
Java_VERSION              = This is set to: $major[.$minor[.$patch[.$tweak]]]
</pre></div>
</div>
<div class="versionadded">
<p><span class="versionmodified added">New in version 3.4: </span>Added the <code class="docutils literal notranslate"><span class="pre">Java_IDLJ_EXECUTABLE</span></code> and <code class="docutils literal notranslate"><span class="pre">Java_JARSIGNER_EXECUTABLE</span></code>
variables.</p>
</div>
<p>The minimum required version of Java can be specified using the
<span class="target" id="index-0-command:find_package"></span><a class="reference internal" href="../command/find_package.html#command:find_package" title="find_package"><code class="xref cmake cmake-command docutils literal notranslate"><span class="pre">find_package()</span></code></a> syntax, e.g.</p>
<div class="highlight-cmake notranslate"><div class="highlight"><pre><span></span><span class="nf">find_package(</span><span class="nb">Java</span><span class="w"> </span><span class="m">1.8</span><span class="nf">)</span><span class="w"></span>
</pre></div>
</div>
<p>NOTE: <code class="docutils literal notranslate"><span class="pre">${Java_VERSION}</span></code> and <code class="docutils literal notranslate"><span class="pre">${Java_VERSION_STRING}</span></code> are not guaranteed to
be identical.  For example some java version may return:
<code class="docutils literal notranslate"><span class="pre">Java_VERSION_STRING</span> <span class="pre">=</span> <span class="pre">1.8.0_17</span></code> and <code class="docutils literal notranslate"><span class="pre">Java_VERSION</span> <span class="pre">=</span> <span class="pre">1.8.0.17</span></code></p>
<p>another example is the Java OEM, with: <code class="docutils literal notranslate"><span class="pre">Java_VERSION_STRING</span> <span class="pre">=</span> <span class="pre">1.8.0-oem</span></code>
and <code class="docutils literal notranslate"><span class="pre">Java_VERSION</span> <span class="pre">=</span> <span class="pre">1.8.0</span></code></p>
<p>For these components the following variables are set:</p>
<div class="highlight-none notranslate"><div class="highlight"><pre><span></span>Java_FOUND                    - TRUE if all components are found.
Java_&lt;component&gt;_FOUND        - TRUE if &lt;component&gt; is found.
</pre></div>
</div>
<p>Example Usages:</p>
<div class="highlight-none notranslate"><div class="highlight"><pre><span></span>find_package(Java)
find_package(Java 1.8 REQUIRED)
find_package(Java COMPONENTS Runtime)
find_package(Java COMPONENTS Development)
</pre></div>
</div>
</section>


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