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Spring Boot Sample: EclipseLink, WAR-Deployment, Eclipse IDE

This project shows how to use Spring Boot with EclipseLink as a JPA provider, configure the project for to package WAR-file, and develop in Eclipse IDE.

EclipseLink

  • Maven
    • In pom.xml transitive dependency hibernate-entitymanager excluded from the org.springframework.boot
    • eclipselink dependency added
    • maven-surefire-plugin and spring-boot-maven-plugin are configured to use spring-instrument for dynamic weaving
  • Spring Boot
    • JpaConfiguration.java sets up EclipseLinkJpaVendorAdapter
    • Best weaving mode is selected: dynamic if spring-instrument agent is present, and static mode otherwise (even if classes are not weaved, the application will still run in false mode)

WAR-Deployment

  • Maven
    • Packaging ist set to war
    • spring-boot-starter-tomcat set to provided scope
    • staticweave-maven-plugin is added to statically weave persistence classes for war-file which can then run without any javaagents.
  • Spring Boot
    • Class SampleDataJpaApplication extends SpringBootServletInitializer

Eclipse IDE

  • Maven
    • spring-boot-maven-plugin: option addResources is set to false to not to conflict with Eclipse behaviour.

To run the application, JUnits or Tomcat inside the IDE with dynamic weaving, add following arguments to JVM:

-noverify
-javaagent:${env_var:USERPROFILE}\.m2\repository\org\springframework\spring-instrument\4.1.6.RELEASE\spring-instrument-4.1.6.RELEASE.jar 
-javaagent:${env_var:USERPROFILE}\.m2\repository\org\springframework\springloaded\1.2.3.RELEASE\springloaded-1.2.3.RELEASE.jar

Notes:

  • The order of the agents is important!
  • Remove line breaks!
  • Update versions according to your pom
  • Agent springloaded is optional
  • To download the required jars to your local Maven repository, just run mvn spring-boot:run once

Running

This setup can run all possible ways:

  • Deploy on Tomcat inside Eclipse
  • Or execute SampleDataJpaApplication insede Eclipse
  • Or run mvn spring-boot:run
  • Or run mvn package and then:
    • either deploy target\projectname.war
    • or run java -jar target\projectname.war

Logging

  • Slf4jSessionLogger included that forwards EclipseLink logging to Slf4J. Read the javadoc and application.yml for more information.
  • logback-custom.xml can be activated by uncommenting environment variables in /webapp/META-INF/context.xml (works only when running as deployment on Tomcat)