Release notes for Groovy 2.6
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Groovy 2.6 was intended to be a back-port of Groovy 3.0 for JDK7 but with features requiring JDK 8 removed. Alpha versions have been released which support the new Parrot parser (when enabled) but these versions are not feature complete wrt Groovy 3.0 functionality. We have left the alpha versions available to help people wanting to port towards Groovy 3.0 but who are stuck on JDK7. However, we strongly encourage all users on JDK8 or above to move directly to Groovy 3.0. You should consult the Groovy 3.0 release notes for a list of supported language changes. Only differences with 3.0 due to the different JVM requirements are reported here.
Parrot Parser
Groovy 2.6 defaults to using the old parser but you can enable the Parrot parser which supports additional syntax options and language features.
Enabling the parser
For Groovy 3.0, the new parser is enabled by default.
However, for Groovy 2.6, you enable the new parser using a system property.
Use -Dgroovy.antlr4=true (set via JAVA_OPTS if needed).
If building from source, you need to provide Gradle with -PuseAntlr4
in order to include the classes which support the new parser.
Feature differences with Groovy 3.0
Groovy 2.6 doesn’t support native lambdas.
Bundled dependencies
Groovy 2.6 optionally uses an earlier version of Ant (vs a later version in Groovy 3.0 which requires JDK8).
JDK requirements
Groovy 2.6 requires JDK8+ to build and JDK7 (vs JDK8 for Groovy 3.0) is the minimum version of the JRE that we support.
More information
You can browse all the tickets closed for Groovy 2.6 in JIRA.