Java backporting tools

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

Main information


	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	https://github.com/orfjackal/retrolambda
Retrotranslator	Java 5		2009-08-09, 1.2.9	BSD-like	http://retrotranslator.sourceforge.net/
Retroweaver	Java 5		2008-10-14, 2.0.7	BSD-like	http://retroweaver.sourceforge.net/
Declawer	Java 5	Java 1.4	2007-11-14	LGPL or MPL	http://www.glazedlists.com/Home/declawer
JBossRetro	Java 5	Java 1.4	2008-03-10, 1.1.2	LGPL	http://www.jboss.org/community/docs/DOC-10738

Features

	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
Retrolambda
Retrotranslator	Yes	No	Yes	Yes^[1]	No	No	extensive	limited	none
Retroweaver	No	No	No	No	No
Declawer
JBossRetro

References

↑ It uses the backport of the Java 5.0 concurrency utilities.

External links

How to use Java 5 language features in earlier JDKs

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[1] It uses the backport of the Java 5.0 concurrency utilities.