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From: =?UTF-8?Q?Arne_Vajh=c3=b8j?= <arne@vajhoej.dk>
Newsgroups: comp.lang.java.programmer
Subject: Re: Problem compiling with 9 for 8
Date: Mon, 2 Oct 2017 16:10:15 -0400
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On 10/2/2017 3:49 PM, Knute Johnson wrote:
> On 10/2/2017 13:25, Arne Vajhøj wrote:
>> On 10/2/2017 11:51 AM, Knute Johnson wrote:
>>> I want to compile this program with the Java 9 compiler but with but 
>>> with the --release 8 option so that it will run on a Java 8 runtime. 
>>> The --add-modules option is not available if the --release options is 
>>> specified.  Anybody know what the solution is?  Am I going at this 
>>> the wrong way?
>>>
>>> C:\Users\Knute Johnson>javac --release 8 -Xlint:unchecked -cp 
>>> .;com/knutejohnson
>>> /rosen/javax.mail.jar com/knutejohnson/rosen/PHD2Alarms.java
>>> .\com\knutejohnson\rosen\AlarmDialog2.java:9: error: package 
>>> javafx.scene.media
>>> does not exist
>>> import javafx.scene.media.*;
>>> ^
>>> .\com\knutejohnson\rosen\AlarmDialog2.java:60: error: cannot find symbol
>>>          AudioClip clip = null;
>>>          ^
>>>    symbol:   class AudioClip
>>>    location: class AlarmDialog2
>>
>> Have you tried putting Java 8 jfxrt.jar explicit in classpath?
> 
> No but that file is not included in Java 9.  It compiles fine if I don't 
> have the --release 8 option and it compiled fine under Java 8.

Yes. But does it work?

It is my understanding that:

javac --release 8 ...

is really a short version of:

javac -source 1.8 -target 1.8 -Xbootclasspath:pathtojava8jar ...

And if that is correct then it still need the old jar files
to build against.

And maybe it just don't find jfxrt.jar automatically.

Arne