After the automatic update of jdk 1.8.0_451 all my .jar applications stopped working. I compile again, and it runs in Release mode. but running the .jar file directly does not work.
B4J Question jdk 1.8.0_451 (SOLVED)
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Ok... that's what I'll do. Thanks... I have to communicate with some clients so that they don't do the automatic update...
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Yes... there is no other way. But, the biggest problem is that I already have several systems installed on clients.
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Yes, to follow up on OliverA's question above, are you double clicking on the JAR file to run it?
If the answer to my question is Yes.... I had a similar problem during an automatic Java update and I have disabled automatic updates ever since....
Come to find out that there was NOTHING wrong with the JAR file. The problem was the Windows association of the jar file with the java runtime. I can't remember how I fixed it, but once I did, the jar file could be run with a double click. I'll try to find out what I did but in the meantime I suggest you research how the Java8 JRE installer does this association during installation/updates. During the update, that association probably got screwed up.... not uncommon with updates as you probably know
Here's something I found in a quick Google search. Have not read it but it's worth looking at:
superuser.com
BTW.. if you want to confirm that this is actually the issue, open a command prompt and go to the folder that has the jar file you want to run. Enter:
java -version
[confirm the correct version installed]
java -jar myprogram.jar
If it runs, my theory is correct.
If the answer to my question is Yes.... I had a similar problem during an automatic Java update and I have disabled automatic updates ever since....
Come to find out that there was NOTHING wrong with the JAR file. The problem was the Windows association of the jar file with the java runtime. I can't remember how I fixed it, but once I did, the jar file could be run with a double click. I'll try to find out what I did but in the meantime I suggest you research how the Java8 JRE installer does this association during installation/updates. During the update, that association probably got screwed up.... not uncommon with updates as you probably know
Here's something I found in a quick Google search. Have not read it but it's worth looking at:
How to repair a broken .jar association in Windows 10?
While trying to run a .jar file (Optifine installer for Minecraft), I accidentally thought that I could use the OpenJDK package that comes with Android Studio to run it. However, I was wrong, and n...
BTW.. if you want to confirm that this is actually the issue, open a command prompt and go to the folder that has the jar file you want to run. Enter:
java -version
[confirm the correct version installed]
java -jar myprogram.jar
If it runs, my theory is correct.
Last edited:
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It can run on B4J is because B4J is using the old jdk8
As announced in 2020, support for JavaFX on JDK 8, ended in March 2025. JDK 8 update 451 is the first upgrade of JDK/JRE 8 without JavaFX.
At post#3, the java runtime has been updated to 451. it will not support javafx app.
solutions:
1.Change java runtime to the old jdk and associate JAR file with old jdk.
2.Or copy all relevant JavaFX files from the old jdk to the new jdk folder.
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The problem is not in the B4J execution time, because after the installation all the .jar files that were running normally stopped.
This weekend I will make a complete backup and rebuild this computer.
PS: The execution in B4J works normally.
This weekend I will make a complete backup and rebuild this computer.
PS: The execution in B4J works normally.
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yes... I read post #13... but see my confusion,,, I have another machine (Notebook) with Java 1.8.0_451 installed and all .Jar applications work perfectly.
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As aminoacid said at post#12, run java -version to see which java are you using?yes... I read post #13... but see my confusion,,, I have another machine (Notebook) with Java 1.8.0_451 installed and all .Jar applications work perfectly.
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Microsoft Windows [versão 10.0.19045.5737]
(c) Microsoft Corporation. Todos os direitos reservados.
C:\WINDOWS\system32>java -version
java version "19.0.2" 2023-01-17
Java(TM) SE Runtime Environment (build 19.0.2+7-44)
Java HotSpot(TM) 64-Bit Server VM (build 19.0.2+7-44, mixed mode, sharing)
C:\WINDOWS\system32>
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There you go... this is the problem ... B4J is using update 351 which has JavaFX and that's why it works in the B4J IDE.
However, when you run the JAR file outside of B4J it's going to use a different version (19.0.2) that is probably incompatible. Like I said in Post#12, somehow your .jar association is broken. When you run "java -version" from the command line, it should be the same as the version used by B4J - v1.8.0 update 351.
Run this command from the command line:
c:\Java\jdk1.8.0_351\bin\java.exe -jar <complete path to the jar file you want to run>
If it works, you will have to fix the broken association as mentioned in my post above.
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