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General Tech Bugs & Fixes 2 years ago
Posted on 16 Aug 2022, this text provides information on Bugs & Fixes related to General Tech. Please note that while accuracy is prioritized, the data presented might not be entirely correct or up-to-date. This information is offered for general knowledge and informational purposes only, and should not be considered as a substitute for professional advice.
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I have a java jar file. How can I check with which version of java , the jar file got created which build was performed. There was a recent Java upgrade happened on my system from Java Version 1.6 to Java version 1.8 and a Jar file stopped working.
On Linux, Mac OS X or Windows with Cygwin installed, the file(1) command knows the class version.
$ file ./org/apache/log4j/Appender.class ./org/apache/log4j/Appender.class: compiled Java class data, version 45.3
And if you are relegated to a Windows environment without either file or grep
> javap -v ./org/apache/log4j/Appender.class | findstr major major version: 45
Reference: What version of javac built my jar?
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