For instance, a package can now say:
buildInputs = [ ant jre ecj ];
which would cause the Eclipse compiler to be used with the OpenJRE.
Similarly:
buildInputs = [ ant gcj ];
uses the GNU JVM with the GNU Java compiler.
Now that Java is happy with our /etc/localtime, there is no reason to
set $TZ anymore. (See 945849b86f, 279248f6c5, 1b5e860f65607b4cc7de4b6b5db95460cf144526.)
Fixes#1463.
Some programs (notably the Java Runtime Environment) expect to be able
to extract the name of the time zone from the target of the
/etc/localtime symlink. That doesn't work if /etc/localtime is a
symlink to /etc/static/localtime. So make it a direct symlink.
All JARs in $pkg/share/java (for each $pkg in the build inputs) are
added to $CLASSPATH. Thus, you can say
buildInputs = [ setJavaClassPath someJavaDependency ];
and the JARs in someJavaDependency will be found automatically by
tools like javac or ant.
Note that the manual used to say that JARs should be installed in
lib/java; this is now share/java, following the Debian policy:
http://www.debian.org/doc/packaging-manuals/java-policy/x110.html
The directory share/java makes more sense because JARs are
architecture-independent. (Also, a quick grep shows that we were not
exactly consistent about this in Nixpkgs.)
Also, Ant no longer has a build-time dependency on a particular JDK.
It finds the JDK via $JAVA_HOME or $PATH (by looking up javac). This
way, we don't need to have separate packages like apacheAntOpenJDK and
apacheAntOracleJDK. It also seems reasonable: after all, installing
GNU Make doesn't give you a C compiler either. It does mean that
instead of
buildInputs = [ ant ];
you now need to write something like
buildInputs = [ ant jdk ];
This unifies the "openjdk" and "openjre" packages. The JDK is placed
in the "out" output, the JRE in "jre".
Also, everything is now stored in $prefix/lib/openjdk, so the JDK/JRE
no longer pollute user environments with files like
"ASSEMBLY_EXCEPTION" at top-level.
