Merge pull request #23633 from Miehau

* pr/23633:
  Polish 'Add a FailureAnalyzer for ConfigDataNotFound'
  Add a FailureAnalyzer for ConfigDataNotFound

Closes gh-23633

spring-boot-project/spring-boot/src/main/java/org/springframework/boot/context/config/ConfigDataNotFoundFailureAnalyzer.java

@@ -0,0 +1,62 @@
+/*
+ * 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.context.config;
+
+import org.springframework.boot.diagnostics.AbstractFailureAnalyzer;
+import org.springframework.boot.diagnostics.FailureAnalysis;
+import org.springframework.boot.origin.Origin;
+
+/**
+ * An implementation of {@link AbstractFailureAnalyzer} to analyze failures caused by
+ * {@link ConfigDataNotFoundException}.
+ *
+ * @author Michal Mlak
+ * @author Phillip Webb
+ */
+class ConfigDataNotFoundFailureAnalyzer extends AbstractFailureAnalyzer<ConfigDataNotFoundException> {
+
+	@Override
+	protected FailureAnalysis analyze(Throwable rootFailure, ConfigDataNotFoundException cause) {
+		ConfigDataLocation location = getLocation(cause);
+		Origin origin = Origin.from(location);
+		StringBuilder message = new StringBuilder(
+				String.format("Config data %s does not exist", cause.getReferenceDescription()));
+		StringBuilder action = new StringBuilder("Check that the value ");
+		if (location != null) {
+			action.append(String.format("'%s' ", location));
+		}
+		if (origin != null) {
+			action.append(String.format("at %s ", origin));
+		}
+		action.append("is correct");
+		if (location != null && !location.isOptional()) {
+			action.append(String.format(", or prefix it with '%s'", ConfigDataLocation.OPTIONAL_PREFIX));
+		}
+		return new FailureAnalysis(message.toString(), action.toString(), cause);
+	}
+
+	private ConfigDataLocation getLocation(ConfigDataNotFoundException cause) {
+		if (cause instanceof ConfigDataLocationNotFoundException) {
+			return ((ConfigDataLocationNotFoundException) cause).getLocation();
+		}
+		if (cause instanceof ConfigDataResourceNotFoundException) {
+			return ((ConfigDataResourceNotFoundException) cause).getLocation();
+		}
+		return null;
+	}
+
+}

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

@@ -58,6 +58,7 @@ org.springframework.boot.reactor.DebugAgentEnvironmentPostProcessor
 
 # Failure Analyzers
 org.springframework.boot.diagnostics.FailureAnalyzer=\
+org.springframework.boot.context.config.ConfigDataNotFoundFailureAnalyzer,\
 org.springframework.boot.context.properties.IncompatibleConfigurationFailureAnalyzer,\
 org.springframework.boot.context.properties.NotConstructorBoundInjectionFailureAnalyzer,\
 org.springframework.boot.diagnostics.analyzer.BeanCurrentlyInCreationFailureAnalyzer,\

spring-boot-project/spring-boot/src/test/java/org/springframework/boot/context/config/ConfigDataNotFoundFailureAnalyzerTests.java

@@ -0,0 +1,117 @@
+/*
+ * 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.context.config;
+
+import org.junit.jupiter.api.Test;
+
+import org.springframework.boot.diagnostics.FailureAnalysis;
+import org.springframework.boot.origin.Origin;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+/**
+ * Tests for {@link ConfigDataNotFoundFailureAnalyzer}
+ *
+ * @author Michal Mlak
+ * @author Phillip Webb
+ */
+class ConfigDataNotFoundFailureAnalyzerTests {
+
+	private final ConfigDataNotFoundFailureAnalyzer analyzer = new ConfigDataNotFoundFailureAnalyzer();
+
+	@Test
+	void analyzeWhenConfigDataLocationNotFoundException() {
+		ConfigDataLocation location = ConfigDataLocation.of("test");
+		ConfigDataLocationNotFoundException exception = new ConfigDataLocationNotFoundException(location);
+		FailureAnalysis result = this.analyzer.analyze(exception);
+		assertThat(result.getDescription()).isEqualTo("Config data location 'test' does not exist");
+		assertThat(result.getAction())
+				.isEqualTo("Check that the value 'test' is correct, or prefix it with 'optional:'");
+	}
+
+	@Test
+	void analyzeWhenOptionalConfigDataLocationNotFoundException() {
+		ConfigDataLocation location = ConfigDataLocation.of("optional:test");
+		ConfigDataLocationNotFoundException exception = new ConfigDataLocationNotFoundException(location);
+		FailureAnalysis result = this.analyzer.analyze(exception);
+		assertThat(result.getDescription()).isEqualTo("Config data location 'optional:test' does not exist");
+		assertThat(result.getAction()).isEqualTo("Check that the value 'optional:test' is correct");
+	}
+
+	@Test
+	void analyzeWhenConfigDataLocationWithOriginNotFoundException() {
+		ConfigDataLocation location = ConfigDataLocation.of("test").withOrigin(new TestOrigin("origin"));
+		ConfigDataLocationNotFoundException exception = new ConfigDataLocationNotFoundException(location);
+		FailureAnalysis result = this.analyzer.analyze(exception);
+		assertThat(result.getDescription()).isEqualTo("Config data location 'test' does not exist");
+		assertThat(result.getAction())
+				.isEqualTo("Check that the value 'test' at origin is correct, or prefix it with 'optional:'");
+	}
+
+	@Test
+	void analyzeWhenConfigDataResourceNotFoundException() {
+		ConfigDataResource resource = new TestConfigDataResource("myresource");
+		ConfigDataResourceNotFoundException exception = new ConfigDataResourceNotFoundException(resource);
+		FailureAnalysis result = this.analyzer.analyze(exception);
+		assertThat(result.getDescription()).isEqualTo("Config data resource 'myresource' does not exist");
+		assertThat(result.getAction()).isEqualTo("Check that the value is correct");
+	}
+
+	@Test
+	void analyzeWhenConfigDataResourceWithLocationNotFoundException() {
+		ConfigDataLocation location = ConfigDataLocation.of("test");
+		ConfigDataResource resource = new TestConfigDataResource("myresource");
+		ConfigDataResourceNotFoundException exception = new ConfigDataResourceNotFoundException(resource)
+				.withLocation(location);
+		FailureAnalysis result = this.analyzer.analyze(exception);
+		assertThat(result.getDescription())
+				.isEqualTo("Config data resource 'myresource' via location 'test' does not exist");
+		assertThat(result.getAction())
+				.isEqualTo("Check that the value 'test' is correct, or prefix it with 'optional:'");
+	}
+
+	static class TestOrigin implements Origin {
+
+		private final String string;
+
+		TestOrigin(String string) {
+			this.string = string;
+		}
+
+		@Override
+		public String toString() {
+			return this.string;
+		}
+
+	}
+
+	static class TestConfigDataResource extends ConfigDataResource {
+
+		private final String string;
+
+		TestConfigDataResource(String string) {
+			this.string = string;
+		}
+
+		@Override
+		public String toString() {
+			return this.string;
+		}
+
+	}
+
+}