Merge branch '1.5.x'

spring-boot/src/main/java/org/springframework/boot/diagnostics/analyzer/BeanCurrentlyInCreationFailureAnalyzer.java

@@ -39,28 +39,40 @@ class BeanCurrentlyInCreationFailureAnalyzer
 	@Override
 	protected FailureAnalysis analyze(Throwable rootFailure,
 			BeanCurrentlyInCreationException cause) {
-		List<BeanInCycle> cycle = new ArrayList<>();
+		DependencyCycle dependencyCycle = findCycle(rootFailure);
+		if (dependencyCycle == null) {
+			return null;
+		}
+		return new FailureAnalysis(buildMessage(dependencyCycle), null, cause);
+	}
+
+	private DependencyCycle findCycle(Throwable rootFailure) {
+		List<BeanInCycle> beansInCycle = new ArrayList<>();
 		Throwable candidate = rootFailure;
 		int cycleStart = -1;
 		while (candidate != null) {
 			BeanInCycle beanInCycle = BeanInCycle.get(candidate);
 			if (beanInCycle != null) {
-				int index = cycle.indexOf(beanInCycle);
+				int index = beansInCycle.indexOf(beanInCycle);
 				if (index == -1) {
-					cycle.add(beanInCycle);
+					beansInCycle.add(beanInCycle);
 				}
 				cycleStart = (cycleStart == -1 ? index : cycleStart);
 			}
 			candidate = candidate.getCause();
 		}
-		String message = buildMessage(cycle, cycleStart);
-		return new FailureAnalysis(message, null, cause);
+		if (cycleStart == -1) {
+			return null;
+		}
+		return new DependencyCycle(beansInCycle, cycleStart);
 	}
 
-	private String buildMessage(List<BeanInCycle> beansInCycle, int cycleStart) {
+	private String buildMessage(DependencyCycle dependencyCycle) {
 		StringBuilder message = new StringBuilder();
 		message.append(String.format("The dependencies of some of the beans in the "
 				+ "application context form a cycle:%n%n"));
+		List<BeanInCycle> beansInCycle = dependencyCycle.getBeansInCycle();
+		int cycleStart = dependencyCycle.getCycleStart();
 		for (int i = 0; i < beansInCycle.size(); i++) {
 			BeanInCycle beanInCycle = beansInCycle.get(i);
 			if (i == cycleStart) {
@@ -77,6 +89,27 @@ class BeanCurrentlyInCreationFailureAnalyzer
 		return message.toString();
 	}
 
+	private static final class DependencyCycle {
+
+		private final List<BeanInCycle> beansInCycle;
+
+		private final int cycleStart;
+
+		private DependencyCycle(List<BeanInCycle> beansInCycle, int cycleStart) {
+			this.beansInCycle = beansInCycle;
+			this.cycleStart = cycleStart;
+		}
+
+		public List<BeanInCycle> getBeansInCycle() {
+			return this.beansInCycle;
+		}
+
+		public int getCycleStart() {
+			return this.cycleStart;
+		}
+
+	}
+
 	private static final class BeanInCycle {
 
 		private final String name;

spring-boot/src/test/java/org/springframework/boot/diagnostics/analyzer/BeanCurrentlyInCreationFailureAnalyzerTests.java

@@ -24,6 +24,7 @@ import java.util.List;
 
 import org.junit.Test;
 
+import org.springframework.beans.factory.BeanCurrentlyInCreationException;
 import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.boot.diagnostics.FailureAnalysis;
 import org.springframework.boot.diagnostics.FailureAnalyzer;
@@ -116,6 +117,12 @@ public class BeanCurrentlyInCreationFailureAnalyzerTests {
 		assertThat(lines.get(11)).isEqualTo("└─────┘");
 	}
 
+	@Test
+	public void cycleWithAnUnknownStartIsNotAnalyzed() throws IOException {
+		assertThat(this.analyzer.analyze(new BeanCurrentlyInCreationException("test")))
+				.isNull();
+	}
+
 	private List<String> readDescriptionLines(FailureAnalysis analysis)
 			throws IOException {
 		try (BufferedReader lineReader = new BufferedReader(