B4J Question App has been compiled by a more recent version of the java runtime

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dieterp

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I'm running into incompatible version issues when I try run m B4J app (Built on my local laptop) on my Windows Server. The exact error is "App has been compiled by a more recent version of the java runtime <Class file version 53.0>, this version of the java runtime only recognizes class file versions up to 52.0"

I am using the latest version OpenJDK 14 from the B4x website on my local laptop. As I understand it version 52.0 = Java 8 and version 53.0 = Java 9. My questions are:

1) Why would my app compile in java 9 if I'm using a later version of Java
2) How can I go about getting the app to be compatible with the Java version running on my server
 
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EnriqueGonzalez

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dieterp said:
only recognizes class file versions up to 52.0
Click to expand...
it says, that recognizes UP to, not that your app was compiled with 52.

dieterp said:
How can I go about getting the app to be compatible with the Java version running on my server
Click to expand...
it seems you have java 8 in your server, if you compiled with java 14, install java 14 in your server.
 
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MicroDrie

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EnriqueGonzalez said:
it says, that recognizes UP to, not that your app was compiled with 52.


it seems you have java 8 in your server, if you compiled with java 14, install java 14 in your server.
Click to expand...
Or less impact than upgrading a server OS, install Java 1.8 for B4A and B4J in addition to the Java 14 SDK. In addition to Java SDK version 14.0.1 for my program development on laptop, I use at the same time version 1.8 for B4A running without any problems.
 
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EnriqueGonzalez

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MicroDrie said:
Or less impact than upgrading a server OS,
Click to expand...
I never mentioned upgrading sever OS.
MicroDrie said:
install Java 1.8 for B4A and B4J in addition to the Java 14 SDK. In addition to Java SDK version 14.0.1 for my program development on laptop, I use at the same time version 1.8 for B4A running without any problems.
Click to expand...
Latest b4j web server is not compatible with java 8 only java 11 onwards
 
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MicroDrie

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Compatibility has never been our strong suit as programmers
 
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