mirror of
https://github.com/NixOS/nixpkgs.git
synced 2024-11-27 17:33:09 +00:00
ef21e5ee60
There's no change in content except for amending the title of the section to mention "frameworks", as e.g. I don't consider Qt a language, and it's likely there will be more of similar cases in future. To be certain, I checked diff of the generated HTMLs.
85 lines
2.6 KiB
XML
85 lines
2.6 KiB
XML
<section xmlns="http://docbook.org/ns/docbook"
|
||
xmlns:xlink="http://www.w3.org/1999/xlink"
|
||
xml:id="sec-language-java">
|
||
|
||
<title>Java</title>
|
||
|
||
<para>Ant-based Java packages are typically built from source as follows:
|
||
|
||
<programlisting>
|
||
stdenv.mkDerivation {
|
||
name = "...";
|
||
src = fetchurl { ... };
|
||
|
||
buildInputs = [ jdk ant ];
|
||
|
||
buildPhase = "ant";
|
||
}
|
||
</programlisting>
|
||
|
||
Note that <varname>jdk</varname> is an alias for the OpenJDK.</para>
|
||
|
||
<para>JAR files that are intended to be used by other packages should
|
||
be installed in <filename>$out/share/java</filename>. The OpenJDK has
|
||
a stdenv setup hook that adds any JARs in the
|
||
<filename>share/java</filename> directories of the build inputs to the
|
||
<envar>CLASSPATH</envar> environment variable. For instance, if the
|
||
package <literal>libfoo</literal> installs a JAR named
|
||
<filename>foo.jar</filename> in its <filename>share/java</filename>
|
||
directory, and another package declares the attribute
|
||
|
||
<programlisting>
|
||
buildInputs = [ jdk libfoo ];
|
||
</programlisting>
|
||
|
||
then <envar>CLASSPATH</envar> will be set to
|
||
<filename>/nix/store/...-libfoo/share/java/foo.jar</filename>.</para>
|
||
|
||
<para>Private JARs
|
||
should be installed in a location like
|
||
<filename>$out/share/<replaceable>package-name</replaceable></filename>.</para>
|
||
|
||
<para>If your Java package provides a program, you need to generate a
|
||
wrapper script to run it using the OpenJRE. You can use
|
||
<literal>makeWrapper</literal> for this:
|
||
|
||
<programlisting>
|
||
buildInputs = [ makeWrapper ];
|
||
|
||
installPhase =
|
||
''
|
||
mkdir -p $out/bin
|
||
makeWrapper ${jre}/bin/java $out/bin/foo \
|
||
--add-flags "-cp $out/share/java/foo.jar org.foo.Main"
|
||
'';
|
||
</programlisting>
|
||
|
||
Note the use of <literal>jre</literal>, which is the part of the
|
||
OpenJDK package that contains the Java Runtime Environment. By using
|
||
<literal>${jre}/bin/java</literal> instead of
|
||
<literal>${jdk}/bin/java</literal>, you prevent your package from
|
||
depending on the JDK at runtime.</para>
|
||
|
||
<para>It is possible to use a different Java compiler than
|
||
<command>javac</command> from the OpenJDK. For instance, to use the
|
||
Eclipse Java Compiler:
|
||
|
||
<programlisting>
|
||
buildInputs = [ jre ant ecj ];
|
||
</programlisting>
|
||
|
||
(Note that here you don’t need the full JDK as an input, but just the
|
||
JRE.) The ECJ has a stdenv setup hook that sets some environment
|
||
variables to cause Ant to use ECJ, but this doesn’t work with all Ant
|
||
files. Similarly, you can use the GNU Java Compiler:
|
||
|
||
<programlisting>
|
||
buildInputs = [ gcj ant ];
|
||
</programlisting>
|
||
|
||
Here, Ant will automatically use <command>gij</command> (the GNU Java
|
||
Runtime) instead of the OpenJRE.</para>
|
||
|
||
</section>
|
||
|