I can't Understanding EntityManager code generated by Spring Roo

@PersistenceContext
transient EntityManager entityManager;

public static final EntityManager entityManager() {
EntityManager em = new Food().entityManager;
if (em == null)
throw new IllegalStateException(
"Entity manager has not been injected (is the Spring Aspects JAR configured as an AJC/AJDT aspects library?)");
return em;
}

the code looks very suspicious.

help me . very very Thanks you . and bless you

Since entityManager() is static it has to create an instance of Food otherwise DI would not work (via AspectJ due to using new and not getBean()). Then it checks if the em exists and returns it.

Quote:

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Originally Posted by spgmx

Since entityManager() is static it has to create an instance of Food otherwise DI would not work (via AspectJ due to using new and not getBean()). Then it checks if the em exists and returns it.

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;) thank you replay.

the Clear reasons

Code:

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        public Shop() {
                JoinPoint joinpoint1 = Factory.makeJP(ajc$tjp_11, this, this);
                JoinPoint joinpoint = Factory.makeJP(ajc$tjp_0, this, this);
                if (this != null && getClass().isAnnotationPresent(Configurable) && AnnotationBeanConfigurerAspect.ajc$if$bb0((Configurable) getClass().getAnnotation(Configurable))) {

                        AnnotationBeanConfigurerAspect.aspectOf().ajc$before$org_springframework_beans_factory_aspectj_AbstractDependencyInjectionAspect$1$e854fa65(this);
                }

                if (this != null && getClass().isAnnotationPresent(Configurable) && (this == null || !getClass().isAnnotationPresent(Configurable) || !AnnotationBeanConfigurerAspect.ajc$if$bb0((Configurable) getClass().getAnnotation(Configurable))) && AbstractDependencyInjectionAspect.ajc$if$6f1(joinpoint)) {
                       
                        AnnotationBeanConfigurerAspect.aspectOf().ajc$afterReturning$org_springframework_beans_factory_aspectj_AbstractDependencyInjectionAspect$2$1ea6722c(this);
                }
                if (!AnnotationBeanConfigurerAspect.ajc$if$bb0((Configurable) getClass().getAnnotation(Configurable)) && AbstractDependencyInjectionAspect.ajc$if$6f1(joinpoint1)) {

                        AnnotationBeanConfigurerAspect.aspectOf().ajc$afterReturning$org_springframework_beans_factory_aspectj_AbstractDependencyInjectionAspect$2$1ea6722c(this);
                }
        }

        public static final EntityManager entityManager() {
                JoinPoint joinpoint = Factory.makeJP(ajc$tjp_1, null, null);
                if (AnnotationDrivenStaticEntityMockingControl.ajc$cflowCounter$1.isValid() && AnnotationDrivenStaticEntityMockingControl.hasAspect())
                        return (EntityManager) entityManager_aroundBody1$advice(joinpoint, AnnotationDrivenStaticEntityMockingControl.aspectOf(), null, ajc$tjp_1, joinpoint);
                else
                        return entityManager_aroundBody0(joinpoint);
        }

        private static final EntityManager entityManager_aroundBody0(JoinPoint joinpoint) {
                EntityManager em = (new Shop()).entityManager;
                if (em == null)
                        throw new IllegalStateException("Entity manager has not been injected (is the Spring Aspects JAR configured as an AJC/AJDT aspects library?)");
                else
                        return em;
        }

        private static final Object entityManager_aroundBody1$advice(JoinPoint thisJoinPoint, AbstractMethodMockingControl ajc$aspectInstance, AroundClosure ajc$aroundClosure, org.aspectj.lang.JoinPoint.StaticPart thisJoinPointStaticPart, JoinPoint thisJoinPoint) {
                if (AbstractMethodMockingControl.ajc$inlineAccessFieldGet$org_springframework_mock_staticmock_AbstractMethodMockingControl$org_springframework_mock_staticmock_AbstractMethodMockingControl$recording(ajc$aspectInstance)) {
                        AbstractMethodMockingControl.ajc$inlineAccessFieldGet$org_springframework_mock_staticmock_AbstractMethodMockingControl$org_springframework_mock_staticmock_AbstractMethodMockingControl$expectations(ajc$aspectInstance).expectCall(thisJoinPointStaticPart.toLongString(), thisJoinPoint.getArgs());
                        return null;
                } else {
                        return AbstractMethodMockingControl.ajc$inlineAccessFieldGet$org_springframework_mock_staticmock_AbstractMethodMockingControl$org_springframework_mock_staticmock_AbstractMethodMockingControl$expectations(ajc$aspectInstance).respond(thisJoinPointStaticPart.toLongString(), thisJoinPoint.getArgs());
                }
        }

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