diff --git a/spring-boot-devtools/src/test/java/org/springframework/boot/devtools/restart/RestarterTests.java b/spring-boot-devtools/src/test/java/org/springframework/boot/devtools/restart/RestarterTests.java
index 0d97d5d2bd9..f1a1975691f 100644
--- a/spring-boot-devtools/src/test/java/org/springframework/boot/devtools/restart/RestarterTests.java
+++ b/spring-boot-devtools/src/test/java/org/springframework/boot/devtools/restart/RestarterTests.java
@@ -175,7 +175,7 @@ public class RestarterTests {
 				Thread viaFactory = factory.newThread(runnable);
 				// Regular threads will inherit the current thread
 				assertThat(regular.getContextClassLoader()).isEqualTo(contextClassLoader);
-				// Factory threads should should inherit from the initial thread
+				// Factory threads should inherit from the initial thread
 				assertThat(viaFactory.getContextClassLoader()).isEqualTo(parentLoader);
 			};
 		};
diff --git a/spring-boot-docs/src/main/asciidoc/appendix-application-properties.adoc b/spring-boot-docs/src/main/asciidoc/appendix-application-properties.adoc
index 1051c12d106..50e468cc22f 100644
--- a/spring-boot-docs/src/main/asciidoc/appendix-application-properties.adoc
+++ b/spring-boot-docs/src/main/asciidoc/appendix-application-properties.adoc
@@ -754,7 +754,7 @@ content into your application; rather pick only the properties that you need.
 	spring.jta.narayana.recovery-jms-user= # JMS username to be used by recovery manager.
 	spring.jta.narayana.recovery-modules= # Comma-separated list of recovery modules.
 	spring.jta.narayana.transaction-manager-id=1 # Unique transaction manager id.
-	spring.jta.narayana.xa-resource-orphan-filters= # Comma-separated list of of orphan filters.
+	spring.jta.narayana.xa-resource-orphan-filters= # Comma-separated list of orphan filters.
 
 	# EMBEDDED MONGODB ({sc-spring-boot-autoconfigure}/mongo/embedded/EmbeddedMongoProperties.{sc-ext}[EmbeddedMongoProperties])
 	spring.mongodb.embedded.features=SYNC_DELAY # Comma-separated list of features to enable.
diff --git a/spring-boot/src/main/java/org/springframework/boot/jta/narayana/NarayanaProperties.java b/spring-boot/src/main/java/org/springframework/boot/jta/narayana/NarayanaProperties.java
index 8136787cff5..c3818652d83 100644
--- a/spring-boot/src/main/java/org/springframework/boot/jta/narayana/NarayanaProperties.java
+++ b/spring-boot/src/main/java/org/springframework/boot/jta/narayana/NarayanaProperties.java
@@ -88,7 +88,7 @@ public class NarayanaProperties {
 	private String recoveryJmsPass = null;
 
 	/**
-	 * Comma-separated list of of orphan filters.
+	 * Comma-separated list of orphan filters.
 	 */
 	private List<String> xaResourceOrphanFilters = Arrays.asList(
 			"com.arjuna.ats.internal.jta.recovery.arjunacore.JTATransactionLogXAResourceOrphanFilter",
diff --git a/spring-boot/src/main/java/org/springframework/boot/neo4j/SessionFactoryProvider.java b/spring-boot/src/main/java/org/springframework/boot/neo4j/SessionFactoryProvider.java
index 2411c3bb5c8..19232849e52 100644
--- a/spring-boot/src/main/java/org/springframework/boot/neo4j/SessionFactoryProvider.java
+++ b/spring-boot/src/main/java/org/springframework/boot/neo4j/SessionFactoryProvider.java
@@ -20,7 +20,7 @@ import org.neo4j.ogm.config.Configuration;
 import org.neo4j.ogm.session.SessionFactory;
 
 /**
- * Provide a a Neo4j {@link SessionFactory} instance based on a configurable
+ * Provide a Neo4j {@link SessionFactory} instance based on a configurable
  * {@link Configuration} and custom packages to scan.
  *
  * @author Stephane Nicoll