Java backporting tools

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Java backporting tools are programs (usually written in Java) that convert Java classes bytecodes from one version of the Java Platform to an older one (for example Java 5.0 backported to 1.4).

Java backporting tools comparison[edit]

Main information[edit]

Source Version Target Version Last Release License Website
Retrolambda Java 8 Java 7, 6, 5 2015-12-19, 2.1.0 Apache License 2.0
Retrotranslator Java 5 2009-08-09, 1.2.9 BSD-like
Retroweaver Java 5 2008-10-14, 2.0.7 BSD-like
Declawer Java 5 Java 1.4 2007-11-14 LGPL or MPL
JBossRetro Java 5 Java 1.4 2008-03-10, 1.1.2 LGPL


lambda expressions default methods generics enhanced for loops annotations autoboxing and unboxing static imports varargs Enumerations Reflection on generics and annotations Covariant return types
Retrolambda Yes Yes
Retrotranslator No No Yes Yes Yes Yes Yes Yes Yes Yes Yes
Retroweaver No No Yes Yes Yes Yes Yes Yes Yes No No
Declawer No No Yes
JBossRetro No No
Formatted output Formatted input Collections framework enhancements Concurrency utilities emulate the Java 5.0 memory model support for JDK1.6 File methods like canExecute() API support for JDK1.4 API support for JDK1.3 API support for older release
Retrotranslator Yes No Yes Yes[1] No No extensive limited none
Retroweaver No No No No No

See also[edit]


  1. ^ It uses the backport of the Java 5.0 concurrency utilities.

External links[edit]