Merge pull request #22320 from fernandezseb

* gh-22320:
  Polish "Add failure analyzer for missing Liquibase changelog"
  Add failure analyzer for missing Liquibase changelog

Closes gh-22320

spring-boot-project/spring-boot/src/main/java/org/springframework/boot/liquibase/LiquibaseChangelogMissingFailureAnalyzer.java

@@ -0,0 +1,56 @@
+/*
+ * Copyright 2012-2020 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
+ *
+ *      https://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.liquibase;
+
+import java.io.FileNotFoundException;
+
+import liquibase.exception.ChangeLogParseException;
+
+import org.springframework.boot.diagnostics.AbstractFailureAnalyzer;
+import org.springframework.boot.diagnostics.FailureAnalysis;
+import org.springframework.util.StringUtils;
+
+/**
+ * An {@link AbstractFailureAnalyzer} that analyzes exceptions of type
+ * {@link ChangeLogParseException} caused by a Liquibase changelog not being present.
+ *
+ * @author Sebastiaan Fernandez
+ */
+class LiquibaseChangelogMissingFailureAnalyzer extends AbstractFailureAnalyzer<ChangeLogParseException> {
+
+	@Override
+	protected FailureAnalysis analyze(Throwable rootFailure, ChangeLogParseException cause) {
+		FileNotFoundException fileNotFound = findCause(cause, FileNotFoundException.class);
+		if (fileNotFound != null) {
+			String changelogPath = extractChangelogPath(cause);
+			if (StringUtils.hasText(changelogPath)) {
+				return new FailureAnalysis(getDescription(changelogPath),
+						"Make sure a Liquibase changelog is present at the configured path.", cause);
+			}
+		}
+		return null;
+	}
+
+	private String extractChangelogPath(ChangeLogParseException cause) {
+		return cause.getMessage().substring("Error parsing ".length());
+	}
+
+	private String getDescription(String changelogPath) {
+		return "Liquibase failed to start because no changelog could be found at '" + changelogPath + "'.";
+	}
+
+}

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

@@ -56,7 +56,8 @@ org.springframework.boot.diagnostics.analyzer.ValidationExceptionFailureAnalyzer
 org.springframework.boot.diagnostics.analyzer.IncompatibleConfigurationFailureAnalyzer,\
 org.springframework.boot.diagnostics.analyzer.InvalidConfigurationPropertyNameFailureAnalyzer,\
 org.springframework.boot.diagnostics.analyzer.InvalidConfigurationPropertyValueFailureAnalyzer,\
-org.springframework.boot.diagnostics.analyzer.PatternParseFailureAnalyzer
+org.springframework.boot.diagnostics.analyzer.PatternParseFailureAnalyzer,\
+org.springframework.boot.liquibase.LiquibaseChangelogMissingFailureAnalyzer
 
 # FailureAnalysisReporters
 org.springframework.boot.diagnostics.FailureAnalysisReporter=\

spring-boot-project/spring-boot/src/test/java/org/springframework/boot/liquibase/LiquibaseChangelogMissingFailureAnalyzerTests.java

@@ -0,0 +1,99 @@
+/*
+ * Copyright 2012-2020 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
+ *
+ *      https://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.liquibase;
+
+import java.io.File;
+
+import javax.sql.DataSource;
+
+import liquibase.integration.spring.SpringLiquibase;
+import org.junit.jupiter.api.AfterAll;
+import org.junit.jupiter.api.BeforeAll;
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.io.TempDir;
+
+import org.springframework.beans.factory.BeanCreationException;
+import org.springframework.boot.diagnostics.FailureAnalysis;
+import org.springframework.boot.jdbc.DataSourceBuilder;
+import org.springframework.context.annotation.AnnotationConfigApplicationContext;
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+/**
+ * Tests for {@link LiquibaseChangelogMissingFailureAnalyzer}
+ *
+ * @author Sebastiaan Fernandez
+ */
+class LiquibaseChangelogMissingFailureAnalyzerTests {
+
+	@BeforeAll
+	static void configureDerbyLogLocation(@TempDir File temp) {
+		System.setProperty("derby.stream.error.file", new File(temp, "derby.log").getAbsolutePath());
+	}
+
+	@AfterAll
+	static void clearDerbyLogLocation(@TempDir File temp) {
+		System.clearProperty("derby.stream.error.file");
+	}
+
+	@Test
+	void changelogParseExceptionDueToChangelogNotPresent() {
+		FailureAnalysis analysis = performAnalysis();
+		assertThat(analysis.getDescription())
+				.isEqualTo("Liquibase failed to start because no changelog could be found at '"
+						+ "classpath:/db/changelog/db.changelog-master.yaml'.");
+		assertThat(analysis.getAction())
+				.isEqualTo("Make sure a Liquibase changelog is present at the configured path.");
+	}
+
+	private FailureAnalysis performAnalysis() {
+		BeanCreationException failure = createFailure();
+		assertThat(failure).isNotNull();
+		return new LiquibaseChangelogMissingFailureAnalyzer().analyze(failure);
+	}
+
+	private BeanCreationException createFailure() {
+		try (AnnotationConfigApplicationContext context = new AnnotationConfigApplicationContext(
+				LiquibaseConfiguration.class)) {
+			return null;
+		}
+		catch (BeanCreationException ex) {
+			return ex;
+		}
+	}
+
+	@Configuration(proxyBeanMethods = false)
+	static class LiquibaseConfiguration {
+
+		@Bean
+		DataSource dataSource() {
+			return DataSourceBuilder.create().url("jdbc:hsqldb:mem:test").username("sa").build();
+		}
+
+		@Bean
+		SpringLiquibase springLiquibase(DataSource dataSource) {
+			SpringLiquibase liquibase = new SpringLiquibase();
+			liquibase.setChangeLog("classpath:/db/changelog/db.changelog-master.yaml");
+			liquibase.setDataSource(dataSource);
+			return liquibase;
+		}
+
+	}
+
+}