Check exception cause for @PropertySource(ignoreResourceNotFound) support

Prior to this commit, the ignoreResourceNotFound flag in
@PropertySource was ignored by PropertySourceProcessor if a
PropertySourceFactory threw an exception which wrapped an exception
that would otherwise be ignored -- for example, a FileNotFoundException.

To address this issue, this commit updates PropertySourceFactory so
that it catches RuntimeException and IOException and then checks if the
exception or its cause is an "ignorable" exception in terms of
ignoreResourceNotFound semantics.

Closes gh-22276

spring-core/src/main/java/org/springframework/core/io/support/PropertySourceProcessor.java

@@ -34,6 +34,7 @@ import org.springframework.core.env.MutablePropertySources;
 import org.springframework.core.env.PropertySource;
 import org.springframework.core.io.Resource;
 import org.springframework.core.io.ResourceLoader;
+import org.springframework.lang.Nullable;
 import org.springframework.util.Assert;
 import org.springframework.util.ReflectionUtils;
 
@@ -44,6 +45,7 @@ import org.springframework.util.ReflectionUtils;
  * single {@link PropertySource} rather than creating dedicated ones.
  *
  * @author Stephane Nicoll
+ * @author Sam Brannen
  * @since 6.0
  * @see PropertySourceDescriptor
  */
@@ -88,9 +90,10 @@ public class PropertySourceProcessor {
 				Resource resource = this.resourceLoader.getResource(resolvedLocation);
 				addPropertySource(factory.createPropertySource(name, new EncodedResource(resource, encoding)));
 			}
-			catch (IllegalArgumentException | FileNotFoundException | UnknownHostException | SocketException ex) {
-				// Placeholders not resolvable or resource not found when trying to open it
-				if (ignoreResourceNotFound) {
+			catch (RuntimeException | IOException ex) {
+				// Placeholders not resolvable (IllegalArgumentException) or resource not found when trying to open it
+				if (ignoreResourceNotFound && (ex instanceof IllegalArgumentException || isIgnorableException(ex) ||
+						isIgnorableException(ex.getCause()))) {
 					if (logger.isInfoEnabled()) {
 						logger.info("Properties location [" + location + "] not resolvable: " + ex.getMessage());
 					}
@@ -150,4 +153,14 @@ public class PropertySourceProcessor {
 		}
 	}
 
+	/**
+	 * Determine if the supplied exception can be ignored according to
+	 * {@code ignoreResourceNotFound} semantics.
+	 */
+	private static boolean isIgnorableException(@Nullable Throwable ex) {
+		return (ex instanceof FileNotFoundException ||
+				ex instanceof UnknownHostException ||
+				ex instanceof SocketException);
+	}
+
 }

spring-core/src/test/java/org/springframework/core/io/support/PropertySourceProcessorTests.java

@@ -0,0 +1,182 @@
+/*
+ * Copyright 2002-2023 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.core.io.support;
+
+import java.io.FileNotFoundException;
+import java.io.IOException;
+import java.io.UncheckedIOException;
+import java.net.SocketException;
+import java.net.UnknownHostException;
+import java.util.List;
+
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Nested;
+import org.junit.jupiter.api.Test;
+
+import org.springframework.core.env.PropertySource;
+import org.springframework.core.env.StandardEnvironment;
+import org.springframework.core.io.DefaultResourceLoader;
+import org.springframework.core.io.ResourceLoader;
+import org.springframework.util.ClassUtils;
+
+import static org.assertj.core.api.Assertions.assertThat;
+import static org.assertj.core.api.Assertions.assertThatExceptionOfType;
+import static org.assertj.core.api.Assertions.assertThatNoException;
+
+/**
+ * Unit tests for {@link PropertySourceProcessor}.
+ *
+ * @author Sam Brannen
+ * @since 6.0.12
+ */
+class PropertySourceProcessorTests {
+
+	private static final String PROPS_FILE = ClassUtils.classPackageAsResourcePath(PropertySourceProcessorTests.class) + "/test.properties";
+
+	private final StandardEnvironment environment = new StandardEnvironment();
+	private final ResourceLoader resourceLoader = new DefaultResourceLoader();
+	private final PropertySourceProcessor processor = new PropertySourceProcessor(environment, resourceLoader);
+
+
+	@BeforeEach
+	void checkInitialPropertySources() {
+		assertThat(environment.getPropertySources()).hasSize(2);
+	}
+
+	@Test
+	void processorRegistersPropertySource() throws Exception {
+		PropertySourceDescriptor descriptor = new PropertySourceDescriptor(List.of(PROPS_FILE), false, null, DefaultPropertySourceFactory.class, null);
+		processor.processPropertySource(descriptor);
+		assertThat(environment.getPropertySources()).hasSize(3);
+		assertThat(environment.getProperty("enigma")).isEqualTo("42");
+	}
+
+	@Nested
+	class FailOnErrorTests {
+
+		@Test
+		void processorFailsOnIllegalArgumentException() {
+			assertProcessorFailsOnError(IllegalArgumentExceptionPropertySourceFactory.class, IllegalArgumentException.class);
+		}
+
+		@Test
+		void processorFailsOnFileNotFoundException() {
+			assertProcessorFailsOnError(FileNotFoundExceptionPropertySourceFactory.class, FileNotFoundException.class);
+		}
+
+		private void assertProcessorFailsOnError(
+				Class<? extends PropertySourceFactory> factoryClass, Class<? extends Throwable> exceptionType) {
+
+			PropertySourceDescriptor descriptor =
+					new PropertySourceDescriptor(List.of(PROPS_FILE), false, null, factoryClass, null);
+			assertThatExceptionOfType(exceptionType).isThrownBy(() -> processor.processPropertySource(descriptor));
+			assertThat(environment.getPropertySources()).hasSize(2);
+		}
+
+	}
+
+	@Nested
+	class IgnoreResourceNotFoundTests {
+
+		@Test
+		void processorIgnoresIllegalArgumentException() {
+			assertProcessorIgnoresFailure(IllegalArgumentExceptionPropertySourceFactory.class);
+		}
+
+		@Test
+		void processorIgnoresFileNotFoundException() {
+			assertProcessorIgnoresFailure(FileNotFoundExceptionPropertySourceFactory.class);
+		}
+
+		@Test
+		void processorIgnoresUnknownHostException() {
+			assertProcessorIgnoresFailure(UnknownHostExceptionPropertySourceFactory.class);
+		}
+
+		@Test
+		void processorIgnoresSocketException() {
+			assertProcessorIgnoresFailure(SocketExceptionPropertySourceFactory.class);
+		}
+
+		@Test
+		void processorIgnoresSupportedExceptionWrappedInIllegalStateException() {
+			assertProcessorIgnoresFailure(WrappedIOExceptionPropertySourceFactory.class);
+		}
+
+		@Test
+		void processorIgnoresSupportedExceptionWrappedInUncheckedIOException() {
+			assertProcessorIgnoresFailure(UncheckedIOExceptionPropertySourceFactory.class);
+		}
+
+		private void assertProcessorIgnoresFailure(Class<? extends PropertySourceFactory> factoryClass) {
+			PropertySourceDescriptor descriptor = new PropertySourceDescriptor(List.of(PROPS_FILE), true, null, factoryClass, null);
+			assertThatNoException().isThrownBy(() -> processor.processPropertySource(descriptor));
+			assertThat(environment.getPropertySources()).hasSize(2);
+		}
+
+	}
+
+
+	private static class IllegalArgumentExceptionPropertySourceFactory implements PropertySourceFactory {
+
+		@Override
+		public PropertySource<?> createPropertySource(String name, EncodedResource resource) throws IOException {
+			throw new IllegalArgumentException("bogus");
+		}
+	}
+
+	private static class FileNotFoundExceptionPropertySourceFactory implements PropertySourceFactory {
+
+		@Override
+		public PropertySource<?> createPropertySource(String name, EncodedResource resource) throws IOException {
+			throw new FileNotFoundException("bogus");
+		}
+	}
+
+	private static class UnknownHostExceptionPropertySourceFactory implements PropertySourceFactory {
+
+		@Override
+		public PropertySource<?> createPropertySource(String name, EncodedResource resource) throws IOException {
+			throw new UnknownHostException("bogus");
+		}
+	}
+
+	private static class SocketExceptionPropertySourceFactory implements PropertySourceFactory {
+
+		@Override
+		public PropertySource<?> createPropertySource(String name, EncodedResource resource) throws IOException {
+			throw new SocketException("bogus");
+		}
+	}
+
+	private static class WrappedIOExceptionPropertySourceFactory implements PropertySourceFactory {
+
+		@Override
+		public PropertySource<?> createPropertySource(String name, EncodedResource resource) {
+			throw new IllegalStateException("Wrapped", new FileNotFoundException("bogus"));
+		}
+	}
+
+	private static class UncheckedIOExceptionPropertySourceFactory implements PropertySourceFactory {
+
+		@Override
+		public PropertySource<?> createPropertySource(String name, EncodedResource resource) {
+			throw new UncheckedIOException("Wrapped", new FileNotFoundException("bogus"));
+		}
+	}
+
+}

spring-core/src/test/resources/org/springframework/core/io/support/test.properties

@@ -0,0 +1 @@
+enigma = 42