I spent over a decade as a consultant working for dozens of companies in many fields and pursuits. The diversity of each code base is tremendous. This article will try to define general rules for modernizing legacy code that would hopefully apply to all. But it comes from the angle of a Java developer.

When writing this, my primary focus is on updating an old Java 6 era style J2EE code to the more modern Spring Boot/Jakarta EE code. However, I don’t want to go into the code and try to keep this generic. I discuss COBOL and similar legacy systems too. Most of the overarching guidelines should work for migrating any other type of codebase too.

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