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><H1
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><A
NAME="policy-libraries"
>2.3. Java libraries</A
></H1
><P
> Libraries are not separated between developers (-dev) and users
versions, since this is meaningless in Java.
</P
><P
> Java libraries packages <SPAN
CLASS="emphasis"
><I
CLASS="emphasis"
>must</I
></SPAN
> be named libXXX[version]-java
(without the brackets), where the version part is optional and <SPAN
CLASS="emphasis"
><I
CLASS="emphasis"
>should</I
></SPAN
>
only contain the necessary part. The version part <SPAN
CLASS="emphasis"
><I
CLASS="emphasis"
>should</I
></SPAN
> only be
used to avoid naming collisions. The XXX part is the actual package
name used in the text below.
</P
><P
> Their classes <SPAN
CLASS="emphasis"
><I
CLASS="emphasis"
>must</I
></SPAN
> be in <TT
CLASS="filename"
>jar</TT
> archive(s) in
the directory <TT
CLASS="filename"
>/usr/share/java</TT
>, with the name
<TT
CLASS="filename"
>packagename[-extraname]-fullversion.jar</TT
>.
The extraname is optional and used internally within the package to
separate the different jars provided by the package. The fullversion
is the version of that jar file. In some cases that is not the same as
the package version.
</P
><P
> Some package <SPAN
CLASS="emphasis"
><I
CLASS="emphasis"
>must</I
></SPAN
> also provide a symbolic link from
<TT
CLASS="filename"
>packagename-extraname.jar</TT
> to the most compatible
version of the available
<TT
CLASS="filename"
>packagename-extraname-version.jar</TT
> files.
</P
><P
> Class files in a java library <SPAN
CLASS="emphasis"
><I
CLASS="emphasis"
>must</I
></SPAN
> be built with debug symbols.
</P
><P
> All jar files <SPAN
CLASS="emphasis"
><I
CLASS="emphasis"
>must</I
></SPAN
> have a well-documented CLASSPATH, so
that developers should know what to add to their wrappers.
</P
><P
> This applies only to libraries, <SPAN
CLASS="emphasis"
><I
CLASS="emphasis"
>not</I
></SPAN
> to the core
classes provided by a the runtime environment.
</P
><P
> Some Java libraries rely on code written in a "native" language,
such as JNI (Java Native Interface) code. This native code is
compiled into separate dynamic libraries which are loaded by the
Java virtual machine at runtime.
</P
><P
> If a Java library relies on native code, the dynamic libraries
containing this compiled native code <SPAN
CLASS="emphasis"
><I
CLASS="emphasis"
>should</I
></SPAN
> be installed into
the directory <TT
CLASS="filename"
>/usr/lib/jni</TT
>. These dynamic
libraries <SPAN
CLASS="emphasis"
><I
CLASS="emphasis"
>should</I
></SPAN
> be shipped in a separate architecture-specific
package named libXXX[version]-jni. The package containing the Java
bytecode (generally libXXX[version]-java) <SPAN
CLASS="emphasis"
><I
CLASS="emphasis"
>should</I
></SPAN
> depend on
this package.
</P
><P
> There may be situations, such as with very small packages,
where it is better to bundle the Java code and the native code
together into a single package. Such packages <SPAN
CLASS="emphasis"
><I
CLASS="emphasis"
>should</I
></SPAN
> be
architecture-specific and follow the usual libXXX[version]-java
naming convention.
</P
><P
> Java library packages <SPAN
CLASS="emphasis"
><I
CLASS="emphasis"
>should</I
></SPAN
> compile the javadoc API of the
library. The API <SPAN
CLASS="emphasis"
><I
CLASS="emphasis"
>must</I
></SPAN
> link against the javadoc API of the
libraries it depends on. This includes the core java classes,
which are provided by <SPAN
CLASS="emphasis"
><I
CLASS="emphasis"
>default-jdk-doc</I
></SPAN
>. The API <SPAN
CLASS="emphasis"
><I
CLASS="emphasis"
>must</I
></SPAN
> be registered with
doc-base and <SPAN
CLASS="emphasis"
><I
CLASS="emphasis"
>must</I
></SPAN
> be installed in
<TT
CLASS="filename"
>/usr/share/doc/<package>/api/</TT
> or
<TT
CLASS="filename"
>/usr/share/doc/<package>/api-<component>/</TT
>.
</P
><P
> The API <SPAN
CLASS="emphasis"
><I
CLASS="emphasis"
>must</I
></SPAN
> be placed in a separate doc package. This package
<SPAN
CLASS="emphasis"
><I
CLASS="emphasis"
>must</I
></SPAN
> recommend the doc packages it was linked against.
</P
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