java class file version

yesterday trying to build the current project, in the course, having encountered the class file version problem, like saying “class file version 50 required, yet it’s currently version 49” something like this.

This problem is due to the jdk version difference. The currently compiling class is using a jdk version different from its dependency class, which has been already compiled by a different version jdk.

basically, class version 50, is compiled using jdk 6. version 49 using jdk 5. version 48 using jdk 4

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