Add failure analyzer for Flyway's bootstrap failure

See gh-16015

spring-boot-project/spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/flyway/FlywayAutoConfiguration.java

@@ -168,9 +168,11 @@ public class FlywayAutoConfiguration {
 				Assert.state(locations.length != 0,
 						"Migration script locations not configured");
 				boolean exists = hasAtLeastOneLocation(resourceLoader, locations);
-				Assert.state(exists, () -> "Cannot find migrations location in: "
-						+ Arrays.asList(locations)
-						+ " (please add migrations or check your Flyway configuration)");
+				if (!exists) {
+					throw new FlywayMigrationScriptNotFoundException(
+							"Cannot find migrations in the specified location",
+							Arrays.asList(locations));
+				}
 			}
 		}
 

spring-boot-project/spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/flyway/FlywayMigrationScriptMissingFailureAnalyzer.java

@@ -0,0 +1,39 @@
+/*
+ * Copyright 2012-2019 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.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.springframework.boot.autoconfigure.flyway;
+
+import org.springframework.boot.diagnostics.AbstractFailureAnalyzer;
+import org.springframework.boot.diagnostics.FailureAnalysis;
+
+/**
+ * A {@code FailureAnalyzer} that performs analysis of failures caused by a
+ * {@code FlywayMigrationScriptNotFoundException}.
+ *
+ * @author Anand Shastri
+ */
+public class FlywayMigrationScriptMissingFailureAnalyzer
+		extends AbstractFailureAnalyzer<FlywayMigrationScriptNotFoundException> {
+
+	@Override
+	protected FailureAnalysis analyze(Throwable rootFailure,
+			FlywayMigrationScriptNotFoundException cause) {
+		return new FailureAnalysis(
+				"Cannot find migrations location in " + cause.getLocations(),
+				" please add migrations or check your Flyway configuration", cause);
+	}
+
+}

spring-boot-project/spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/flyway/FlywayMigrationScriptNotFoundException.java

@@ -0,0 +1,41 @@
+/*
+ * Copyright 2012-2019 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.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.springframework.boot.autoconfigure.flyway;
+
+import java.util.List;
+
+/**
+ * Exception thrown when no {@code flyway migration script} is available.
+ *
+ * @author Anand Shastri
+ */
+
+public class FlywayMigrationScriptNotFoundException extends RuntimeException {
+
+	private final List<String> locations;
+
+	public FlywayMigrationScriptNotFoundException(String message,
+			List<String> locations) {
+		super(message);
+		this.locations = locations;
+	}
+
+	public List<String> getLocations() {
+		return this.locations;
+	}
+
+}

spring-boot-project/spring-boot-autoconfigure/src/test/java/org/springframework/boot/autoconfigure/flyway/FlywayAutoConfigurationTests.java

@@ -209,7 +209,7 @@ public class FlywayAutoConfigurationTests {
 					assertThat(context).getFailure()
 							.isInstanceOf(BeanCreationException.class);
 					assertThat(context).getFailure()
-							.hasMessageContaining("Cannot find migrations location in");
+							.hasMessageContaining("Cannot find migrations in");
 				});
 	}
 

spring-boot-project/spring-boot-autoconfigure/src/test/java/org/springframework/boot/autoconfigure/flyway/FlywayMigrationScriptMissingFailureAnalyzerTests.java

@@ -0,0 +1,49 @@
+/*
+ * Copyright 2012-2019 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.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.springframework.boot.autoconfigure.flyway;
+
+import java.util.Collections;
+
+import org.junit.Test;
+
+import org.springframework.boot.diagnostics.FailureAnalysis;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+/**
+ * Tests for {@link FlywayMigrationScriptMissingFailureAnalyzer}
+ *
+ * @author Anand Shastri
+ */
+public class FlywayMigrationScriptMissingFailureAnalyzerTests {
+
+	private final FlywayMigrationScriptMissingFailureAnalyzer analyzer = new FlywayMigrationScriptMissingFailureAnalyzer();
+
+	@Test
+	public void analysisForFlywayScriptMissingFailure() {
+		FailureAnalysis failureAnalysis = this.analyzer
+				.analyze(new FlywayMigrationScriptNotFoundException(
+						"Migration script locations not configured",
+						Collections.singletonList("classpath:db/migration")));
+
+		assertThat(failureAnalysis.getDescription())
+				.endsWith("Cannot find migrations location in [classpath:db/migration]");
+		assertThat(failureAnalysis.getAction())
+				.endsWith(" please add migrations or check your Flyway configuration");
+	}
+
+}

spring-boot-project/spring-boot/src/main/resources/META-INF/spring.factories

@@ -50,7 +50,8 @@ org.springframework.boot.diagnostics.analyzer.NoUniqueBeanDefinitionFailureAnaly
 org.springframework.boot.diagnostics.analyzer.PortInUseFailureAnalyzer,\
 org.springframework.boot.diagnostics.analyzer.ValidationExceptionFailureAnalyzer,\
 org.springframework.boot.diagnostics.analyzer.InvalidConfigurationPropertyNameFailureAnalyzer,\
-org.springframework.boot.diagnostics.analyzer.InvalidConfigurationPropertyValueFailureAnalyzer
+org.springframework.boot.diagnostics.analyzer.InvalidConfigurationPropertyValueFailureAnalyzer,\
+org.springframework.boot.diagnostics.analyzer.FlywayMigrationScriptMissingFailureAnalyzer
 
 # FailureAnalysisReporters
 org.springframework.boot.diagnostics.FailureAnalysisReporter=\