java - Method with @Transactional called on target not on proxy instance -

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i'm migrating 1 of projects form "self configured spring" spring boot. while of stuff working have problem @transactional method when called context not present set before due call "target" instance instead of "proxy" instance (i'll try elaborate below).

first stripped down view of class hierarchy:

 @entity public class config {     // fields , stuff }  public interface exporter {      int startexport() throws exporterexception;      void setconfig(config config); }   public abstract class exporterimpl implements exporter {     protected config config;      @override     public final void setconfig(config config) {         this.config = config;         // this.config valid config instance here     }      @override     @transactional(readonly = true)     public int startexport() throws exporterexception {         // this.config null here     }      // other methods including abstract 1 subclass }  @scope("prototype") @service("cars2exporter") public class cars2exporterimpl extends exporterimpl {      // override abstract methods , other     // not touching startexport() }  // there other implementations of exporterimpl  // in implementations problem occurs

the calling code this:

 @inject private provider<exporter> cars2exporter;  public void scheduleexport(config config) {     exporter exporter = cars2exporter.get();     exporter.setconfig(config);     exporter.startexport();     // i'm wrapping here in class implementing runnable     // , put in queue of `taskexecutor` issue happens     // on direct call too. :( }

what issue?

in call startexport() field config of exporterimpl null although has been set right before.

what found far: breakpoint @ exporter.startexport(); checked id of exporter instance shown eclipse debugger. in debbug round while writing post 16585. continuing execution call/first line of startexport() checked id again (of this time) expecting same realizing not. 16606 here... call startexport() done on instance of class... in previous debug round checked wich instance/id call setconfig() going... first on (16585 in case). explains why config field null in 16606 instance.

to understand happens between line call exporter.startexport(); , actuall first line of startexport() clicked steps between both lines in eclipse debugger.

there came line 655 in cglibaopproxy looks this:

retval = new cglibmethodinvocation(proxy, target, method, args, targetclass, chain, methodproxy).proceed();

checking arguments here found proxy instance id 16585 , target 1 16606.

unfortunately i'm not deep springs aop stuff know if how should be...

i wonder why there 2 instances called on diffrent methods. call setconfig() goes proxy instance , call startexport() reaches target instance , not have access config set...

as mentioned project has been migrated spring boot before using athens-release version of spring platform bom. can tell there no special aop configurations before migration , no explicitly set values after migration.

to problem fixed (or @ least somehow working) tried multiple things:

  • remove @scope sub class
  • move @transactional method level class
  • override startexport() in subclass , put @transactional here
  • add @enableaspectjautoproxy application class (i wasn't able log in - no error message)
  • set spring.aop.proxy-target-class true
  • the above in diffrent combinations...

currently i'm out of clues on how working...

thanks in advance

*hopes can help*

spring boot tries create cglib proxy, class based proxy, before had interface based (jdk dynamic proxy).

due subclass of cars2exporterimpl created , methods overridden , advices applied. setconfig method final cannot overridden , result method called on proxy instead on proxied instance.

so either remove final keyword cglib proxy can created or explicitly disable class based proxies transactions. add @enabletransationmanagement(proxy-target-class=false) should trick. unless there else triggering class based proxies is.


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