Continue processing properties files on error

Prior to this commit, processing of multiple properties files
discovered using a wildcard pattern would stop on any error
encountered while processing a file or when an empty properties file
was found, causing subsequent files from the pattern to be ignored.

This commit changes the behavior such that subsequent files are
processed on error or on an empty file.

Fixes gh-20873

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

@@ -503,16 +503,16 @@ public class ConfigFileApplicationListener implements EnvironmentPostProcessor,
 
 		private void load(PropertySourceLoader loader, String location, Profile profile, DocumentFilter filter,
 				DocumentConsumer consumer) {
-			try {
-				Resource[] resources = getResources(location);
-				for (Resource resource : resources) {
+			Resource[] resources = getResources(location);
+			for (Resource resource : resources) {
+				try {
 					if (resource == null || !resource.exists()) {
 						if (this.logger.isTraceEnabled()) {
 							StringBuilder description = getDescription("Skipped missing config ", location, resource,
 									profile);
 							this.logger.trace(description);
 						}
-						return;
+						continue;
 					}
 					if (!StringUtils.hasText(StringUtils.getFilenameExtension(resource.getFilename()))) {
 						if (this.logger.isTraceEnabled()) {
@@ -520,7 +520,7 @@ public class ConfigFileApplicationListener implements EnvironmentPostProcessor,
 									resource, profile);
 							this.logger.trace(description);
 						}
-						return;
+						continue;
 					}
 					String name = (location.contains("*")) ? "applicationConfig: [" + resource.toString() + "]"
 							: "applicationConfig: [" + location + "]";
@@ -531,7 +531,7 @@ public class ConfigFileApplicationListener implements EnvironmentPostProcessor,
 									profile);
 							this.logger.trace(description);
 						}
-						return;
+						continue;
 					}
 					List<Document> loaded = new ArrayList<>();
 					for (Document document : documents) {
@@ -551,9 +551,11 @@ public class ConfigFileApplicationListener implements EnvironmentPostProcessor,
 						}
 					}
 				}
-			}
-			catch (Exception ex) {
-				throw new IllegalStateException("Failed to load property source from location '" + location + "'", ex);
+				catch (Exception ex) {
+					StringBuilder description = getDescription("Failed to load property source from ", location,
+							resource, profile);
+					throw new IllegalStateException(description.toString(), ex);
+				}
 			}
 		}
 

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

@@ -1010,10 +1010,10 @@ class ConfigFileApplicationListenerTests {
 				"spring.config.location=" + location);
 		this.initializer.setSearchNames("testproperties");
 		this.initializer.postProcessEnvironment(this.environment, this.application);
-		String a = this.environment.getProperty("a.property");
-		String b = this.environment.getProperty("b.property");
-		assertThat(a).isEqualTo("apple");
-		assertThat(b).isEqualTo("ball");
+		String first = this.environment.getProperty("first.property");
+		String second = this.environment.getProperty("second.property");
+		assertThat(first).isEqualTo("apple");
+		assertThat(second).isEqualTo("ball");
 	}
 
 	@Test
@@ -1023,10 +1023,10 @@ class ConfigFileApplicationListenerTests {
 				"spring.config.location=" + location);
 		this.initializer.setSearchNames("testproperties");
 		this.initializer.postProcessEnvironment(this.environment, this.application);
-		String a = this.environment.getProperty("a.property");
-		String b = this.environment.getProperty("b.property");
-		assertThat(a).isEqualTo("apple");
-		assertThat(b).isEqualTo("ball");
+		String first = this.environment.getProperty("first.property");
+		String second = this.environment.getProperty("second.property");
+		assertThat(first).isEqualTo("apple");
+		assertThat(second).isEqualTo("ball");
 	}
 
 	private Condition<ConfigurableEnvironment> matchingPropertySource(final String sourceName) {

spring-boot-project/spring-boot/src/test/resources/config/1-first/testproperties.properties

+first.property=apple
\ No newline at end of file

spring-boot-project/spring-boot/src/test/resources/config/2-second/testproperties.properties

+second.property=ball
\ No newline at end of file

spring-boot-project/spring-boot/src/test/resources/config/a/testproperties.properties

-a.property=apple
\ No newline at end of file

spring-boot-project/spring-boot/src/test/resources/config/b/testproperties.properties

-b.property=ball
\ No newline at end of file