AspectJ and Spring LTW doesn't work when upcasting
I setup LTW (load-time-weaving) with AspectJ and spring pretty quick and successfull. Here is the setup: beans.xml:
Code:
<aop:aspectj-autoproxy />
<context:spring-configured />
<context:load-time-weaver />
<context:component-scan base-package="com.test.service" />
My service that will be autowired to a class:
Code:
@Service
public class MyService {
}
Parent class:
Code:
public class Bar {
}
The configurable class, that autowires the service and extends Bar.
Code:
@Configurable
public class BarExtended extends Bar{
@Autowired
private MyService service;
public MyService getWeavedInObject(){
return service;
}
}
And just a class that has got a referance to the parent class Bar:
Code:
public class Foo {
private Bar bar;
public void setBar(Bar bar) {
this.bar = bar;
}
}
And a successfull test case. It just creates a instance of BarExtended and checks if the LTW worked. The Foo class does nothing. The working JVM parameter is: -javaagent:"${env_var:USERPROFILE}\.m2\repository\o rg\springframework\spring-instrument\3.1.0.RELEASE\spring-instrument-3.1.0.RELEASE.jar"
Code:
@Test
public void simple(){
Foo foo = new Foo();
BarExtended barExtended = new BarExtended();
assertNotNull("LTW didn't work.", barExtended.getWeavedInObject());
}
This test runs green. BUT following test fails:
Code:
@Test
public void simple(){
Foo foo = new Foo();
BarExtended barExtended = new BarExtended();
foo.setBar(barExtended);
assertNotNull("LTW didn't work.", barExtended.getWeavedInObject());
}
I just insert the line where the class BarExtended is set to Foo. The upcast make the AspjectJ not working.
BTW, when I change the Foo class to use the BarExtended class (so no upcasting is needed):
Code:
public class Foo {
private BarExtended bar;
public void setBar(BarExtended bar) {
this.bar = bar;
}
}
The above test will work. Does anyone has an idea why AspjectJ behaves so strange, when a configurable object is upcasted?
Follwing fails as well:
Code:
@Test
public void simple() {
Foo foo = new Foo();
BarExtended barExtended = new BarExtended();
Bar bar = (Bar) new BarExtended();
foo.setBar(bar);
assertNotNull("LTW didn't work.", barExtended.getWeavedInObject());
}
A different BarExtended object is set to Foo and the first barExtended object is ignored by AspectJ. BUT using reflection to instantiate BarExtended works:
Code:
@Test
public void simple() throws InstantiationException, IllegalAccessException{
Foo foo = new Foo();
Bar barExtended = (Bar) BarExtended.class.newInstance();
foo.setBar(barExtended);
assertNotNull("LTW didn't work.", ((BarExtended)barExtended).getWeavedInObject());
}
Strange, isn't it?
Regards,
Andreas