4.0.0 com.ankurm jackson2-to-3-migration 1.0.0 coexistence coexistence Both major versions on ONE classpath — the claim, tested tools.jackson jackson-bom ${jackson3.version} pom import tools.jackson.core jackson-databind com.fasterxml.jackson.core jackson-databind ${jackson2.version} com.fasterxml.jackson.datatype jackson-datatype-jsr310 ${jackson2.version} com.fasterxml.jackson.datatype jackson-datatype-jdk8 ${jackson2.version} org.codehaus.mojo exec-maven-plugin