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BUILDING.md:regular maven uses the the jruby from the installation, i.e. 9.0.0.0.dev. this also means that a regular maven run does not depend under the hood on any other jruby versions from maven central.
VERSION:9.0.0.0.pre1
core/pom.xml:    <version>9.0.0.0.pre1</version>
ext/pom.xml:    <version>9.0.0.0.dev-SNAPSHOT</version>
ext/readline/pom.xml:    <version>9.0.0.0.dev-SNAPSHOT</version>
ext/ripper/pom.xml:    <version>9.0.0.0.dev-SNAPSHOT</version>
lib/pom.xml:    <version>9.0.0.0.pre1</version>
lib/pom.xml:      <version>9.0.0.0.pre1</version>
maven/jruby-complete/pom.xml:    <version>9.0.0.0.pre1</version>
maven/jruby-dist/pom.xml:    <version>9.0.0.0.pre1</version>
maven/jruby-jars/pom.xml:    <version>9.0.0.0.pre1</version>
maven/jruby-jars/pom.xml:    <finalName>${project.artifactId}-9.0.0.0.pre1-SNAPSHOT</finalName>
maven/jruby-jars/pom.xml:            <ruby.version>9.0.0.0.pre1-SNAPSHOT</ruby.version>
maven/jruby-noasm/pom.xml:    <version>9.0.0.0.pre1</version>
maven/jruby-stdlib/pom.xml:    <version>9.0.0.0.pre1</version>
maven/jruby/pom.xml:    <version>9.0.0.0.pre1</version>
maven/pom.xml:    <version>9.0.0.0.pre1</version>
pom.xml:  <version>9.0.0.0.pre1</version>
test/pom.xml:    <version>9.0.0.0.pre1</version>