Hello,
We got the following excpetion AbstractMethodError when we used mixin on
interfaces. The exception does not occur when we applied the same aspect
on implementation - See below the aspect.
We would like to know what we're doing wrong when we use interfaces? The
behavior is a logging aspect. We want to logging all methods from the
interfaces, especially the find* methods.
I've put >>>> 45 et >>>> 34 to give you the line number where the error
is triggered inside the code.
By the past, in "coded-style", with "declare parents", applying aspect on
interfaces did not raise an error.
Best regards
=============
ERROR TRACE
=============
java.lang.AbstractMethodError:
com/cpny/crm/aspects/LoggingBaseBehavior$Loggable.getLog()Lorg/slf4j/Logger;
at
javax.faces.component.MethodBindingMethodExpressionAdapter.invoke(
MethodBindingMethodExpressionAdapter.java:102)
at com.sun.faces.application.ActionListenerImpl.processAction(
ActionListenerImpl.java:102)
... 39 more
Caused by: java.lang.AbstractMethodError:
com/intact/cpny/aspects/LoggingBaseBehavior$Loggable.getLog()Lorg/slf4j/Logger;
at com.cpny.crm.aspects.LoggingServiceBehavior.loggerService(
LoggingServiceBehavior.java:45)
at
com.cpny.crm.domain.services.impl.EDocService.findDocumentsByPolicy(
EDocService.java:34)
==========================================
ASPECT (LoggingServiceBehavior)
==========================================
import org.aspectj.lang.JoinPoint;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Before;
import org.aspectj.lang.annotation.DeclareMixin;
import org.aspectj.lang.annotation.Pointcut;
@Aspect
public class LoggingServiceBehavior extends LoggingBaseBehavior {
@DeclareMixin("com.cpny.crm.domain.services.interfaces.*")
public static Loggable createLoggerDelegate(Object o) {
return new ServantLogger(o.getClass());
}
@Pointcut("execution(*
com.cpny.crm.domain.services.interfaces.*.find*(..))")
public void serviceLogger() {};
@Before(value = "serviceLogger() && this(log)")
public void loggerService(JoinPoint jp, JoinPoint.StaticPart jps,
Loggable log) {
>>>> 45 if (log.getLog().isDebugEnabled()) {
final String args = buildParameters(jp.getArgs());
log.getLog().debug(jps.getSignature().getName() +
" - Entering..." + (args.isEmpty() ? "" : " - params: " + args));
}
}
}
===================
ASPECT BASE
==================
import org.aspectj.lang.annotation.Aspect;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
@Aspect
public abstract class LoggingBaseBehavior {
protected String buildParameters(Object[] parameters) {
StringBuilder sb = new StringBuilder(64);
if (parameters == null) return null;
for(int i = 0; i< parameters.length; i++) {
sb.append("Param")
.append(i+1)
.append(" : ")
.append("'")
.append(parameters[i])
.append("'");
if (i+1 < parameters.length) { sb.append("
- "); }
}
return sb.toString();
}
/*
* The interface and the implementation of Loggable class.
*/
public interface Loggable {
public Logger getLog();
};
public static class ServantLogger implements Loggable {
private transient Logger log = null;
public ServantLogger(Class<? extends Object> clazz) {
this.log = LoggerFactory.getLogger(clazz);
}
@Override
public Logger getLog() {
return log;
}
}
}
=================================
THE SERVICE INTERFACES
=================================
public interface IEDocService extends Serializable {
public IEdocTree findDocumentsByPolicy(String policyNumber, Date
inceptionDate, List<IAgreement> clientAgreementList, UserBean user);
}
==============================================================
THE SERVICE IMPLEMENTATION - EDocService.java
==============================================================
@Named
@Scope("singleton")
public class EDocService implements IEDocService {
private static final long serialVersionUID = 1101L;
private final String SSDC_APPLICATION_CRM_ID = "EDOC";
@Override
public IEdocTree findDocumentsByPolicy(String policyNumber
, Date inceptionDate
, List<IAgreement>
clientAgreementList
, UserBean user) {
>>>> 34 IEdocTree eDocTree = null;
final Map<String, ElectronicDocumentByPolicy> eDocPolicies
=
new HashMap<String,ElectronicDocumentByPolicy>();
final Map<String, IEdocTree> eDocTreeCurrent = new
HashMap<String, IEdocTree>();
final Map<String, IEdocTree> eDocTreeHistory = new
HashMap<String, IEdocTree>();
final Map<String, DescriptionRuleHistory> eDocDescriptions
=
new HashMap<String, DescriptionRuleHistory>();
final Map<String,Object> alreadySeenEDocs = new
HashMap<String,Object>();
IDocumentPresentationService eDocService =
DocumentPresentationFactory.
getDocumentPresentationService();
eDocTree = eDocService.getEdocTreeHistory( eDocPolicies
,
eDocTreeCurrent
,
eDocTreeHistory
,
eDocDescriptions
,
alreadySeenEDocs
,
policyNumber
,
inceptionDate
,
user.getBusinessUnit().getProvince()
,
user.getLocale().getLanguage()
,
buildTerm(clientAgreementList)
, false
,
user.getIvUser()
,
user.getUserType()
,
SSDC_APPLICATION_CRM_ID
,
user.getBusinessUnit().getManufacturerCompany()
,
user.getBusinessUnit().getDistributionChannel()
,
user.getBusinessUnit().getInsuranceBusiness());
return eDocTree;
}
}
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