From ff878ea9dc88aba91c3c3a25ff2bbae6fab36a37 Mon Sep 17 00:00:00 2001
From: Juergen Hoeller <jhoeller@pivotal.io>
Date: Thu, 28 Jul 2016 00:06:13 +0200
Subject: [PATCH] ConfigurationClassParser uses unified ImportStack with
 chained import analysis

Issue: SPR-14517
(cherry picked from commit d96a66a)
---
 .../annotation/ConfigurationClass.java        |  4 +--
 .../annotation/ConfigurationClassParser.java  | 35 +++++++++++--------
 2 files changed, 22 insertions(+), 17 deletions(-)

diff --git a/spring-context/src/main/java/org/springframework/context/annotation/ConfigurationClass.java b/spring-context/src/main/java/org/springframework/context/annotation/ConfigurationClass.java
index 69d2c1978a..7fa587faff 100644
--- a/spring-context/src/main/java/org/springframework/context/annotation/ConfigurationClass.java
+++ b/spring-context/src/main/java/org/springframework/context/annotation/ConfigurationClass.java
@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2015 the original author or authors.
+ * Copyright 2002-2016 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -233,7 +233,7 @@ final class ConfigurationClass {
 
 	@Override
 	public String toString() {
-		return "ConfigurationClass:beanName=" + this.beanName + ",resource=" + this.resource;
+		return "ConfigurationClass: beanName '" + this.beanName + "', " + this.resource;
 	}
 
 
diff --git a/spring-context/src/main/java/org/springframework/context/annotation/ConfigurationClassParser.java b/spring-context/src/main/java/org/springframework/context/annotation/ConfigurationClassParser.java
index 58323247ad..46d9863426 100644
--- a/spring-context/src/main/java/org/springframework/context/annotation/ConfigurationClassParser.java
+++ b/spring-context/src/main/java/org/springframework/context/annotation/ConfigurationClassParser.java
@@ -139,7 +139,7 @@ class ConfigurationClassParser {
 
 	private final List<String> propertySourceNames = new ArrayList<String>();
 
-	private ImportStack importStack = new ImportStack();
+	private final ImportStack importStack = new ImportStack();
 
 	private List<DeferredImportSelectorHolder> deferredImportSelectors;
 
@@ -182,7 +182,7 @@ class ConfigurationClassParser {
 			catch (BeanDefinitionStoreException ex) {
 				throw ex;
 			}
-			catch (Exception ex) {
+			catch (Throwable ex) {
 				throw new BeanDefinitionStoreException(
 						"Failed to parse configuration class [" + bd.getBeanClassName() + "]", ex);
 			}
@@ -276,16 +276,7 @@ class ConfigurationClassParser {
 				// Check the set of scanned definitions for any further config classes and parse recursively if necessary
 				for (BeanDefinitionHolder holder : scannedBeanDefinitions) {
 					if (ConfigurationClassUtils.checkConfigurationClassCandidate(holder.getBeanDefinition(), this.metadataReaderFactory)) {
-						// Provide isolated circular import detection for scanned classes,
-						// since the initial registration did not come explicitly.
-						ImportStack previousStack = this.importStack;
-						this.importStack = new ImportStack();
-						try {
-							parse(holder.getBeanDefinition().getBeanClassName(), holder.getBeanName());
-						}
-						finally {
-							this.importStack = previousStack;
-						}
+						parse(holder.getBeanDefinition().getBeanClassName(), holder.getBeanName());
 					}
 				}
 			}
@@ -493,7 +484,7 @@ class ConfigurationClassParser {
 			catch (BeanDefinitionStoreException ex) {
 				throw ex;
 			}
-			catch (Exception ex) {
+			catch (Throwable ex) {
 				throw new BeanDefinitionStoreException("Failed to process import candidates for configuration class [" +
 						configClass.getMetadata().getClassName() + "]", ex);
 			}
@@ -507,7 +498,7 @@ class ConfigurationClassParser {
 			return;
 		}
 
-		if (checkForCircularImports && this.importStack.contains(configClass)) {
+		if (checkForCircularImports && isChainedImportOnStack(configClass)) {
 			this.problemReporter.error(new CircularImportProblem(configClass, this.importStack));
 		}
 		else {
@@ -550,7 +541,7 @@ class ConfigurationClassParser {
 			catch (BeanDefinitionStoreException ex) {
 				throw ex;
 			}
-			catch (Exception ex) {
+			catch (Throwable ex) {
 				throw new BeanDefinitionStoreException("Failed to process import candidates for configuration class [" +
 						configClass.getMetadata().getClassName() + "]", ex);
 			}
@@ -560,6 +551,20 @@ class ConfigurationClassParser {
 		}
 	}
 
+	private boolean isChainedImportOnStack(ConfigurationClass configClass) {
+		if (this.importStack.contains(configClass)) {
+			String configClassName = configClass.getMetadata().getClassName();
+			AnnotationMetadata importingClass = this.importStack.getImportingClassFor(configClassName);
+			while (importingClass != null) {
+				if (configClassName.equals(importingClass.getClassName())) {
+					return true;
+				}
+				importingClass = this.importStack.getImportingClassFor(importingClass.getClassName());
+			}
+		}
+		return false;
+	}
+
 	/**
 	 * Invoke {@link ResourceLoaderAware}, {@link BeanClassLoaderAware} and
 	 * {@link BeanFactoryAware} contracts if implemented by the given {@code bean}.