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Java: is there a way to make the code (in a third-party JAR) compatible with the transition (1.4 - 1.6)

I have a third-party JAR file that compiled using Java 1.4. Is there a tool that can make a jar file compatible with Java 1.6? (Something like a "repeater," but vice versa). I tried to decompile class files and recompile them in version 1.6, but this fails.

Here is the problem:

My project uses "rsadapter.jar" for 5.1, and I had my project setup in Eclipse 2.0 + JDK 1.4, and it worked fine. Now I switched to Java 1.6 and Eclipse Ganymede (as per requirements), and the same project (exactly the same setup) started complaining about missing class files in "rsadapter.jar". I also put the JAR in the classpath, but it still could not load classes. Then I changed the Java compiler version to 1.4 and started working.

Regards,
Ashish

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3 answers

Classes compiled by JDK 1.4 should be used in Java 6 as-is. If you really encounter a problem, describe it.

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Maybe you defined Eclipse to throw compiler errors when using obsolete methods or classes?

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Source: https://habr.com/ru/post/1723850/

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