errors: Caller pointcuts on servlets

[jlukiano]

I'm trying to apply the caller pointcut below to show me the parameters sent to the servlet by the http request:

 <aspect class="br.com.ilheus.hotels.aspects.LoggingAspectPER_CLASS" scope="PER_CLASS" />
 <bind pointcut="call(java.lang.String javax.servlet.ServletRequest->getParameter(java.lang.String)) AND withincode(void br.com.ilheus.hotels.web.ReservaServlet->doPost(..))">
 <advice name="servletRequestGetParameterAdvice" aspect="br.com.ilheus.hotels.aspects.LoggingAspectPER_CLASS" />
 </bind>

It seems to compile but when I execute the report mode of AopC the error "Unable to figure out calledmethod of a caller
pointcut" appears:

[aopc] java.lang.ExceptionInInitializerError
[aopc] at sun.misc.Unsafe.ensureClassInitialized(Native Method)
[aopc] at sun.reflect.UnsafeFieldAccessorFactory.newFieldAccessor(UnsafeFieldAccessorFactory.java:20)
[aopc] at sun.reflect.ReflectionFactory.newFieldAccessor(ReflectionFactory.java:122)
[aopc] at java.lang.reflect.Field.acquireFieldAccessor(Field.java:779)
[aopc] at java.lang.reflect.Field.getFieldAccessor(Field.java:760)
[aopc] at java.lang.reflect.Field.get(Field.java:228)
[aopc] at org.jboss.aop.standalone.Compiler.loadFile(Compiler.java:173)
[aopc] at org.jboss.aop.standalone.Compiler.compile(Compiler.java:140)
[aopc] at org.jboss.aop.standalone.Compiler.main(Compiler.java:61)
[aopc] Caused by: java.lang.RuntimeException: java.lang.RuntimeException: Unable to figure out calledmethod of a caller pointcut

Also, the web container could not instantiate the servlet after the compilation:

16:57:44,982 INFO [Engine] StandardContext[/ilheus]Marking servlet Reserva as u
navailable
16:57:44,982 ERROR [Engine] StandardWrapperValve[Reserva]: Allocate exception fo
r servlet Reserva
javax.servlet.ServletException: Error instantiating servlet class br.com.ilheus.
hotels.web.ReservaServlet
at org.apache.catalina.core.StandardWrapper.loadServlet(StandardWrapper.
java:986)


I had applied other caller pointcut to the servlet successfully. Does anybody know why I could not intercept the
HttpServletRequest object?

Another abnormal end I had was that a NullPointerException occurs when my servlet processes if I configure my aspect as
per instance:

 <aspect class="br.com.ilheus.hotels.aspects.LoggingAspect" scope="PER_INSTANCE" />

The error is:

23:21:09,233 ERROR [Engine] StandardWrapperValve[Reserva]: Servlet.service() for
servlet Reserva threw exception
java.lang.NullPointerException
at org.jboss.aop.ClassInstanceAdvisor.getPerInstanceAspect(ClassInstance
Advisor.java:98)
at org.jboss.aop.advice.PerInstanceAdvice.invoke(PerInstanceAdvice.java:
48)
at org.jboss.aop.joinpoint.MethodCalledByMethodInvocation.invokeNext(Met
hodCalledByMethodInvocation.java:60)
at org.jboss.aop.ClassAdvisor.invokeCaller(ClassAdvisor.java:1453)
at br.com.ilheus.hotels.web.ReservaServlet.br$com$ilheus$hotels$web$Rese
rvaServlet$doPost$aop(ReservaServlet.java)
at br.com.ilheus.hotels.web.ReservaServlet.doPost(ReservaServlet.java)
at br.com.ilheus.hotels.web.ReservaServlet.br$com$ilheus$hotels$web$Rese
rvaServlet$doGet$aop(ReservaServlet.java)
at br.com.ilheus.hotels.web.ReservaServlet.doGet(ReservaServlet.java)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:697)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:810)
...

In this case none pointcut works.