java-package: add DJK to alternatives

[debian at ginguppin.de]

Hi,
I am sending this to the list's address since reportbug keeps failing 
to deliver reports to debian, don't know why ...

I create my Java-packages from the JDK installer via

make-jpkg

When using them with Eclipse and Ant, using "JRE"->"Run in the same JRE 
as the workspace", Ant fails with the message

com.sun.tools.javac.Main is not on the classpath.
Perhaps JAVA_HOME does not point to the JDK.
It is currently set to "/usr/lib/jvm/jdk-7-oracle-x64/jre"

JAVA_HOME is nowhere actively defined, so it must be done by Eclipse 
internally.
Investigating why it points to "/usr/lib/jvm/jdk-7-oracle-x64/jre" 
instead of "/usr/lib/jvm/jdk-7-oracle-x64" I checked /usr/bin/java:

/usr/bin/java -> /etc/alternatives/java -> 
/usr/lib/jvm/jdk-7-oracle-x64/jre/bin/java

I am pretty sure, this is the cause -- Eclipse constructs the JAVA_HOME 
value from this path.
Checking update-alternatives, I only se the JRE, despite the JDK being 
available:

# update-alternatives --config java
There are 2 choices for the alternative java (providing /usr/bin/java).

   Selection    Path                                           Priority  
Status
------------------------------------------------------------
* 0            /usr/lib/jvm/jdk-7-oracle-x64/jre/bin/java      317      
auto mode
   1            /usr/lib/jvm/jdk-6.43-oracle-x64/jre/bin/java   316      
manual mode
   2            /usr/lib/jvm/jdk-7-oracle-x64/jre/bin/java      317      
manual mode

I'd like to be able to select the JDK, too, at this point. So, 
java-package/make-jpkg should add that to the alternatives if present in 
the created deb package.

Thanks