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private void processImports(ConfigurationClass configClass, SourceClass currentSourceClass,			Collection<SourceClass> importCandidates, boolean checkForCircularImports) { 		if (importCandidates.isEmpty()) {			return;		} 		if (checkForCircularImports && isChainedImportOnStack(configClass)) {			this.problemReporter.error(new CircularImportProblem(configClass, this.importStack));		}		else {			this.importStack.push(configClass);			try {				for (SourceClass candidate : importCandidates) {					if (candidate.isAssignable(ImportSelector.class)) {						// Candidate class is an ImportSelector -> delegate to it to determine imports						Class<?> candidateClass = candidate.loadClass();						ImportSelector selector = BeanUtils.instantiateClass(candidateClass, ImportSelector.class);						ParserStrategyUtils.invokeAwareMethods(								selector, this.environment, this.resourceLoader, this.registry);						if (this.deferredImportSelectors != null && selector instanceof DeferredImportSelector) {							this.deferredImportSelectors.add(									new DeferredImportSelectorHolder(configClass, (DeferredImportSelector) selector));						}						else {							String[] importClassNames = selector.selectImports(currentSourceClass.getMetadata());							Collection<SourceClass> importSourceClasses = asSourceClasses(importClassNames);							processImports(configClass, currentSourceClass, importSourceClasses, false);						}					}					else if (candidate.isAssignable(ImportBeanDefinitionRegistrar.class)) {						// Candidate class is an ImportBeanDefinitionRegistrar ->						// delegate to it to register additional bean definitions						Class<?> candidateClass = candidate.loadClass();						ImportBeanDefinitionRegistrar registrar =								BeanUtils.instantiateClass(candidateClass, ImportBeanDefinitionRegistrar.class);						ParserStrategyUtils.invokeAwareMethods(								registrar, this.environment, this.resourceLoader, this.registry);						configClass.addImportBeanDefinitionRegistrar(registrar, currentSourceClass.getMetadata());					}					else {						// Candidate class not an ImportSelector or ImportBeanDefinitionRegistrar ->						// process it as an @Configuration class						this.importStack.registerImport(								currentSourceClass.getMetadata(), candidate.getMetadata().getClassName());						processConfigurationClass(candidate.asConfigClass(configClass));					}				}			}			catch (BeanDefinitionStoreException ex) {				throw ex;			}			catch (Throwable ex) {				throw new BeanDefinitionStoreException(						"Failed to process import candidates for configuration class [" +						configClass.getMetadata().getClassName() + "]", ex);			}			finally {				this.importStack.pop();			}		}	}