doc/java: convert to markdown

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Jörg Thalheim 2020-11-28 15:14:45 +01:00
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<xi:include href="haskell.section.xml" />
<xi:include href="idris.section.xml" />
<xi:include href="ios.section.xml" />
<xi:include href="java.xml" />
<xi:include href="java.section.xml" />
<xi:include href="lua.section.xml" />
<xi:include href="maven.section.xml" />
<xi:include href="node.section.xml" />

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# Java {#sec-language-java}
Ant-based Java packages are typically built from source as follows:
```nix
stdenv.mkDerivation {
name = "...";
src = fetchurl { ... };
nativeBuildInputs = [ jdk ant ];
buildPhase = "ant";
}
```
Note that `jdk` is an alias for the OpenJDK (self-built where available,
or pre-built via Zulu). Platforms with OpenJDK not (yet) in Nixpkgs
(`Aarch32`, `Aarch64`) point to the (unfree) `oraclejdk`.
JAR files that are intended to be used by other packages should be
installed in `$out/share/java`. JDKs have a stdenv setup hook that add
any JARs in the `share/java` directories of the build inputs to the
`CLASSPATH` environment variable. For instance, if the package `libfoo`
installs a JAR named `foo.jar` in its `share/java` directory, and
another package declares the attribute
```nix
buildInputs = [ libfoo ];
nativeBuildInputs = [ jdk ];
```
then `CLASSPATH` will be set to
`/nix/store/...-libfoo/share/java/foo.jar`.
Private JARs should be installed in a location like
`$out/share/package-name`.
If your Java package provides a program, you need to generate a wrapper
script to run it using a JRE. You can use `makeWrapper` for this:
```nix
nativeBuildInputs = [ makeWrapper ];
installPhase = ''
mkdir -p $out/bin
makeWrapper ${jre}/bin/java $out/bin/foo \
--add-flags "-cp $out/share/java/foo.jar org.foo.Main"
'';
```
Since the introduction of the Java Platform Module System in Java 9,
Java distributions typically no longer ship with a general-purpose JRE:
instead, they allow generating a JRE with only the modules required for
your application(s). Because we can't predict what modules will be
needed on a general-purpose system, the default jre package is the full
JDK. When building a minimal system/image, you can override the
`modules` parameter on `jre_minimal` to build a JRE with only the
modules relevant for you:
```nix
let
my_jre = pkgs.jre_minimal.override {
modules = [
# The modules used by 'something' and 'other' combined:
"java.base"
"java.logging"
];
};
something = (pkgs.something.override { jre = my_jre; });
other = (pkgs.other.override { jre = my_jre; });
in
...
```
Note all JDKs passthru `home`, so if your application requires
environment variables like `JAVA_HOME` being set, that can be done in a
generic fashion with the `--set` argument of `makeWrapper`:
```bash
--set JAVA_HOME ${jdk.home}
```
It is possible to use a different Java compiler than `javac` from the
OpenJDK. For instance, to use the GNU Java Compiler:
```nix
nativeBuildInputs = [ gcj ant ];
```
Here, Ant will automatically use `gij` (the GNU Java Runtime) instead of
the OpenJRE.

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<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 { ... };
nativeBuildInputs = [ jdk ant ];
buildPhase = "ant";
}
</programlisting>
Note that <varname>jdk</varname> is an alias for the OpenJDK (self-built where available, or pre-built via Zulu). Platforms with OpenJDK not (yet) in Nixpkgs (<literal>Aarch32</literal>, <literal>Aarch64</literal>) point to the (unfree) <literal>oraclejdk</literal>.
</para>
<para>
JAR files that are intended to be used by other packages should be installed in <filename>$out/share/java</filename>. JDKs have a stdenv setup hook that add any JARs in the <filename>share/java</filename> directories of the build inputs to the <envar>CLASSPATH</envar> environment variable. For instance, if the package <literal>libfoo</literal> installs a JAR named <filename>foo.jar</filename> in its <filename>share/java</filename> directory, and another package declares the attribute
<programlisting>
buildInputs = [ libfoo ];
nativeBuildInputs = [ jdk ];
</programlisting>
then <envar>CLASSPATH</envar> will be set to <filename>/nix/store/...-libfoo/share/java/foo.jar</filename>.
</para>
<para>
Private JARs should be installed in a location like <filename>$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 a JRE. You can use <literal>makeWrapper</literal> for this:
<programlisting>
nativeBuildInputs = [ 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>
Since the introduction of the Java Platform Module System in Java 9, Java distributions typically no longer ship with a general-purpose JRE: instead, they allow generating a JRE with only the modules required for your application(s). Because we can't predict what modules will be needed on a general-purpose system, the default <package>jre</package> package is the full JDK. When building a minimal system/image, you can override the <literal>modules</literal> parameter on <literal>jre_minimal</literal> to build a JRE with only the modules relevant for you:
<programlisting>
let
my_jre = pkgs.jre_minimal.override {
modules = [
# The modules used by 'something' and 'other' combined:
"java.base"
"java.logging"
];
};
something = (pkgs.something.override { jre = my_jre; });
other = (pkgs.other.override { jre = my_jre; });
in
...
</programlisting>
</para>
<para>
Note all JDKs passthru <literal>home</literal>, so if your application requires environment variables like <envar>JAVA_HOME</envar> being set, that can be done in a generic fashion with the <literal>--set</literal> argument of <literal>makeWrapper</literal>:
<programlisting>
--set JAVA_HOME ${jdk.home}
</programlisting>
</para>
<para>
It is possible to use a different Java compiler than <command>javac</command> from the OpenJDK. For instance, to use the GNU Java Compiler:
<programlisting>
nativeBuildInputs = [ gcj ant ];
</programlisting>
Here, Ant will automatically use <command>gij</command> (the GNU Java Runtime) instead of the OpenJRE.
</para>
</section>