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Old 24.05.2020, 00:05
thetoad thetoad is offline
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Default how does jd2 pick which jre to run?

for the longest time I was running jd2 with the 1.7 jre that came with it when I installed. recently saw a thread that I should delete the jre dir to use the more up to date system jre, so I did.

however, it's not really using the system jre on my ubuntu installation. I have 2 JREs installed, a somewhat older oracle 1.8 installation and a system 1.11 installation, both are setup under their respecitive directories in /usr/lib/jvm/ but 1.11 is setup as the default in the path (i.e. java -version is 1.11). But it seems like jd2 is running it 1.8 by using it's java home directly.

any idea why this might be happening?
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  #2  
Old 25.05.2020, 15:25
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Jiaz Jiaz is offline
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Check/See the JDownloader.sh launcher script.

JDownloader comes with optional bundled jre. By rename/remove the jre/java folder in JDownloader folder, the launcher will try to find/use system one.
You can also just start JDownloader manually via
java -jar JDownloader.jar
commandline
It may be that the old launcher scripts prefers/only works with Java up to 1.8
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  #3  
Old 27.05.2020, 08:43
thetoad thetoad is offline
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so, it doesn't seem to play nice with java11.

look at my install4j file it creates

Code:
JRE_VERSION	/usr	11	0	7	0
JRE_INFO	/usr	110
JRE_VERSION	/usr/lib/jvm/java-1.11.0-openjdk-amd64	11	0	7	0
JRE_INFO	/usr/lib/jvm/java-1.11.0-openjdk-amd64	110
JRE_VERSION	/usr/lib/jvm/java-11-openjdk-amd64	11	0	7	0
JRE_INFO	/usr/lib/jvm/java-11-openjdk-amd64	110
JRE_VERSION	/usr/lib/jvm/java-8-oracle	1	8	0	201
JRE_INFO	/usr/lib/jvm/java-8-oracle
it doesn't seem to like 11 as he "major" number, it only wants a 1 there. i.e. it choses the java8 jvm instead of the 11. However, when I manuallychange it to

Code:
JRE_VERSION	/usr	11	0	7	0
JRE_INFO	/usr	110
JRE_VERSION	/usr/lib/jvm/java-1.11.0-openjdk-amd64	1	11	0	7	0
JRE_INFO	/usr/lib/jvm/java-1.11.0-openjdk-amd64	0
JRE_VERSION	/usr/lib/jvm/java-11-openjdk-amd64	11	0	7	0
JRE_INFO	/usr/lib/jvm/java-11-openjdk-amd64	110
JRE_VERSION	/usr/lib/jvm/java-8-oracle	1	8	0	201
JRE_INFO	/usr/lib/jvm/java-8-oracle	0
(i.e. see second JRE_VERSION/INFO set), it runs with java11.

however, it throws this warning on startup

Code:
WARNING: An illegal reflective access operation has occurred
WARNING: Illegal reflective access by org.appwork.shutdown.ShutdownController (file:/home/spotter/jd2/JDownloader.jar) to field java.lang.ApplicationShutdownHooks.hooks
WARNING: Please consider reporting this to the maintainers of org.appwork.shutdown.ShutdownController
WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations
WARNING: All illegal access operations will be denied in a future release
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  #4  
Old 27.05.2020, 12:30
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Jiaz Jiaz is offline
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The launcher was build at a time where Java9 was still in development And lots has changed with newer java versions, so most likely that's why the launcher prefers/tries to use Java8. Basically you've *renamed* Java 11 to 1.11 which is larger than 1.8 *dirty hack*. A newer created install4j launcher should handle newer jvm just fine

Warnings with Java>1.8 are okay as internal Java stuff has changed.
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Last edited by Jiaz; 27.05.2020 at 12:51.
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  #5  
Old 27.05.2020, 17:55
thetoad thetoad is offline
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I'd have thought that java 11.0 would be greater than java 1.8 as well. was confused why it wasn't taking it (it tried it first, but ignored it. anyways, it was just a note for others that might end up in this position (and as a record for me if I forget and it happens again)
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  #6  
Old 27.05.2020, 18:02
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Jiaz Jiaz is offline
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That is one of the main problems with JVM version numbering changes. The old launcher /jvm version numbering always had 1.X so 11 is invalid one
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