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Am 11.11.2011 11:16, schrieb Willie Wong: |
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> On Thu, Nov 10, 2011 at 11:01:56PM +0200, Alan McKinnon wrote: |
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>>> (i) What is icedtea-web? |
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>> |
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>> If you had actually clicked on the homepage link in the emerge -s |
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>> output you posted, you would have seen in the very first bullet point |
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>> right at the start of the page that icedtea-web is mostly Java Web Start |
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> |
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> The problem is: that doesn't help me at all. What the heck is Web |
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> Start? The corporate-lese at |
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> http://www.oracle.com/technetwork/java/javase/tech/index-jsp-136112.html |
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> doesn't really tell me why or whether I need it. |
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> |
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It is the applet launcher you mentioned further down in your email. It |
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also allows starting standalone applications straight from the web. |
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There is a difference between these two capabilities but I think they |
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are now served by the same plugin. |
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|
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>>> (iv) Do I really need to have so many different java things on my |
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>>> computer? |
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>> |
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[...] |
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>> So, if you want Java as implemented by iced-tea, pick between source |
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>> and -bin. If you want JWS, then emerge that too. |
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>> |
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>> Did you even attempt to google this and find answers yourself? |
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> |
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> Did you read my question? The problem is not that so many JDKs are |
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> available. The problem is "why does portage want to install them all"? |
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> (Scroll up to the top of my message and see the emerge --update output |
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> which wants to SLOT all three of icedtea, icedtea-bin, icedtea-web.) |
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> |
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> So cut the snark, Alan. To spell out the question for you more |
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> clearly: |
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> |
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> Why does portage want to install ALL three kinds of icedteas, |
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> when all I really need is a JRE? Is there some subtle differences |
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> between the three such that I must have all three available? Is the |
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> 6->7 major version update one which they significantly changed the API |
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> so things start breaking left and right? |
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> |
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Yes, there are new features and APIs available with java 1.7 but I doubt |
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any applications in the stable portage tree already use these. Otherwise |
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it should be backwards compatible. |
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Since 1.7 is pretty new I guess there are still many packages explicitly |
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requiring virtual/jdk:6 just because the devs haven't yet tested the |
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transition. On the other hand, some packages will just require |
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virtual/jdk and therefore trigger portage to install the newer slot. |
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|
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> <rant> |
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[...] |
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> What I don't |
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> know (as I admitted so much in the first sentence of my original post) |
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> is Java. I don't code in it. I don't (to the best of my knowledge) |
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> have any packages installed via portage that has code written in Java. |
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> All I need is a JRE to look at some applets on the internet and run a |
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> couple pre-compiled Java applications on my desktop. It may be that I |
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> somehow acquired a need for a JDK and I forgot, I don't know, but why |
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> is it that portage wants to installed two JDKS and on top of that some |
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> web-based JRE at the same time? |
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> </rant> |
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> |
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> W |
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To find out why portage wants the JDK, run `emerge -pv --depclean |
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virtual/jdk`. Repeat until you find @world or something looking familiar. |
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I bet you have LibreOffice installed with USE="java". There is an old |
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thread from earlier this year which describes what functionality you |
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loose when you deactivate that flag. All things considered, though, I |
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think it will be faster to install a JDK than to re-emerge LibreOffice |
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with USE="-java". |
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Regards, |
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Florian Philipp |
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