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<!DOCTYPE document [
  <!ENTITY project SYSTEM "project.xml">
]>
<document url="apr.html">

    &project;

  <properties>
    <title>Apache Portable Runtime (APR) based Native library for Tomcat</title>
    <author>Remy Maucherat</author>
  </properties>

<body>

<section name="Table of Contents">
<toc/>
</section>

  <section name="Introduction">

  <p>
      Tomcat can use the <a href="https://apr.apache.org/">Apache Portable Runtime</a> to
      provide an OpenSSL based TLS implementation for the HTTP connectors.
  </p>

  <p>
      These features allows making Tomcat a general purpose webserver, will enable much better
      integration with other native web technologies, and overall make Java much more viable as
      a full fledged webserver platform rather than simply a backend focused technology.
  </p>

  </section>

  <section name="Installation">

    <p>
      APR support requires three main native components to be installed:
    </p>
    <ul>
      <li>APR library</li>
      <li>JNI wrappers for APR used by Tomcat (libtcnative)</li>
      <li>OpenSSL libraries</li>
    </ul>

    <subsection name="Windows">

    <p>
      Windows binaries are provided for tcnative-2, which is a statically compiled .dll which includes
      OpenSSL and APR. It can be downloaded from <a href="https://tomcat.apache.org/download-native.cgi">here</a>
      as 32bit or AMD x86-64 binaries.
      In security conscious production environments, it is recommended to use separate shared dlls
      for OpenSSL, APR, and libtcnative-2, and update them as needed according to security bulletins.
      Windows OpenSSL binaries are linked from the <a href="https://www.openssl.org">Official OpenSSL
      website</a> (see related/binaries).
    </p>

    </subsection>

    <subsection name="Linux">

    <p>
      Most Linux distributions will ship packages for APR and OpenSSL. The JNI wrapper (libtcnative) will
      then have to be compiled. It depends on APR, OpenSSL, and the Java headers.
    </p>

    <p>
      Requirements:
    </p>
    <ul>
      <li>APR 1.6.3+ development headers (libapr1-dev package)</li>
      <li>OpenSSL 1.1.1+ development headers (libssl-dev package)</li>
      <li>JNI headers from Java compatible JDK 1.4+</li>
      <li>GNU development environment (gcc, make)</li>
    </ul>

    <p>
      The wrapper library sources are located in the Tomcat binary bundle, in the
      <code>bin/tomcat-native.tar.gz</code> archive.
      Once the build environment is installed and the source archive is extracted, the wrapper library
      can be compiled using (from the folder containing the configure script):
    </p>
    <source>./configure &amp;&amp; make &amp;&amp; make install</source>

    </subsection>

  </section>

  <section name="APR Components">

  <p>
    Once the libraries are properly installed and available to Java (if loading fails, the library path
    will be displayed), the Tomcat connectors will automatically use APR.
  </p>

  </section>

  <section name="APR Lifecycle Listener Configuration">
    <p>See <a href="config/listeners.html#APR_Lifecycle_Listener_-_org.apache.catalina.core.AprLifecycleListener">the
    listener configuration</a>.</p>
  </section>

</body>
</document>
