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Keep in mind that not all Eclipse-based Software can run on P3 without any change, it requires some grade of compatibility in many cases (read below).
Configuration main information
JVM version
Java 8 required and Java 11 recommended as the Eclipse project is adopting it as the default JVM version.
Eclipse version
P3 is currently built on Eclipse RAP e3 3.14 (2020-09)
Eclipse Install directory
P3 Eclipse is installed at:
${SHARED_JIRA_HOME}/p3/eclipse
Eclipse Logs
P3 Eclipse logs are:
${LOCAL_JIRA_HOME}/p3/eclipse/worksapce/.metadata/.logs
Entry Points base URL
P3 Eclipse listens to (for custom Entry Points) the same HTTP port as Jira:
${JIRA_BASE_URL}/plugins/servlet/p3/<your_entry_point_here>