diff --git a/spring-boot-project/spring-boot-tools/spring-boot-loader/src/main/java/org/springframework/boot/loader/jar/JarURLConnection.java b/spring-boot-project/spring-boot-tools/spring-boot-loader/src/main/java/org/springframework/boot/loader/jar/JarURLConnection.java
index 4a223a92ca..46d8b9e296 100644
--- a/spring-boot-project/spring-boot-tools/spring-boot-loader/src/main/java/org/springframework/boot/loader/jar/JarURLConnection.java
+++ b/spring-boot-project/spring-boot-tools/spring-boot-loader/src/main/java/org/springframework/boot/loader/jar/JarURLConnection.java
@@ -257,10 +257,10 @@ final class JarURLConnection extends java.net.JarURLConnection {
 		int index = indexOfRootSpec(spec, jarFile.getPathFromRoot());
 		int separator;
 		while ((separator = spec.indexOf(SEPARATOR, index)) > 0) {
-			StringSequence entryName = spec.subSequence(index, separator);
-			JarEntry jarEntry = jarFile.getJarEntry(entryName);
+			JarEntryName entryName = JarEntryName.get(spec.subSequence(index, separator));
+			JarEntry jarEntry = jarFile.getJarEntry(entryName.toCharSequence());
 			if (jarEntry == null) {
-				return JarURLConnection.notFound(jarFile, JarEntryName.get(entryName));
+				return JarURLConnection.notFound(jarFile, entryName);
 			}
 			jarFile = jarFile.getNestedJarFile(jarEntry);
 			index = separator + SEPARATOR.length();
@@ -360,6 +360,10 @@ final class JarURLConnection extends java.net.JarURLConnection {
 			return ((char) ((hi << 4) + lo));
 		}
 
+		public CharSequence toCharSequence() {
+			return this.name;
+		}
+
 		@Override
 		public String toString() {
 			return this.name.toString();
diff --git a/spring-boot-project/spring-boot-tools/spring-boot-loader/src/test/java/org/springframework/boot/loader/TestJarCreator.java b/spring-boot-project/spring-boot-tools/spring-boot-loader/src/test/java/org/springframework/boot/loader/TestJarCreator.java
index 1646d4b0a4..20b686cac4 100644
--- a/spring-boot-project/spring-boot-tools/spring-boot-loader/src/test/java/org/springframework/boot/loader/TestJarCreator.java
+++ b/spring-boot-project/spring-boot-tools/spring-boot-loader/src/test/java/org/springframework/boot/loader/TestJarCreator.java
@@ -51,6 +51,7 @@ public abstract class TestJarCreator {
 
 			writeNestedEntry("nested.jar", unpackNested, jarOutputStream);
 			writeNestedEntry("another-nested.jar", unpackNested, jarOutputStream);
+			writeNestedEntry("space nested.jar", unpackNested, jarOutputStream);
 		}
 	}
 
diff --git a/spring-boot-project/spring-boot-tools/spring-boot-loader/src/test/java/org/springframework/boot/loader/archive/ExplodedArchiveTests.java b/spring-boot-project/spring-boot-tools/spring-boot-loader/src/test/java/org/springframework/boot/loader/archive/ExplodedArchiveTests.java
index 5caa97fb75..5a2b83dbad 100755
--- a/spring-boot-project/spring-boot-tools/spring-boot-loader/src/test/java/org/springframework/boot/loader/archive/ExplodedArchiveTests.java
+++ b/spring-boot-project/spring-boot-tools/spring-boot-loader/src/test/java/org/springframework/boot/loader/archive/ExplodedArchiveTests.java
@@ -108,7 +108,7 @@ public class ExplodedArchiveTests {
 	@Test
 	public void getEntries() {
 		Map<String, Archive.Entry> entries = getEntriesMap(this.archive);
-		assertThat(entries.size()).isEqualTo(10);
+		assertThat(entries.size()).isEqualTo(11);
 	}
 
 	@Test
diff --git a/spring-boot-project/spring-boot-tools/spring-boot-loader/src/test/java/org/springframework/boot/loader/archive/JarFileArchiveTests.java b/spring-boot-project/spring-boot-tools/spring-boot-loader/src/test/java/org/springframework/boot/loader/archive/JarFileArchiveTests.java
index 8a3350c6cb..32079a780a 100755
--- a/spring-boot-project/spring-boot-tools/spring-boot-loader/src/test/java/org/springframework/boot/loader/archive/JarFileArchiveTests.java
+++ b/spring-boot-project/spring-boot-tools/spring-boot-loader/src/test/java/org/springframework/boot/loader/archive/JarFileArchiveTests.java
@@ -82,7 +82,7 @@ public class JarFileArchiveTests {
 	@Test
 	public void getEntries() {
 		Map<String, Archive.Entry> entries = getEntriesMap(this.archive);
-		assertThat(entries.size()).isEqualTo(10);
+		assertThat(entries.size()).isEqualTo(11);
 	}
 
 	@Test
diff --git a/spring-boot-project/spring-boot-tools/spring-boot-loader/src/test/java/org/springframework/boot/loader/jar/CentralDirectoryParserTests.java b/spring-boot-project/spring-boot-tools/spring-boot-loader/src/test/java/org/springframework/boot/loader/jar/CentralDirectoryParserTests.java
index 2ef8e98ffa..32d79779f9 100644
--- a/spring-boot-project/spring-boot-tools/spring-boot-loader/src/test/java/org/springframework/boot/loader/jar/CentralDirectoryParserTests.java
+++ b/spring-boot-project/spring-boot-tools/spring-boot-loader/src/test/java/org/springframework/boot/loader/jar/CentralDirectoryParserTests.java
@@ -81,6 +81,7 @@ public class CentralDirectoryParserTests {
 		assertThat(headers.next().getName().toString()).isEqualTo("special/\u00EB.dat");
 		assertThat(headers.next().getName().toString()).isEqualTo("nested.jar");
 		assertThat(headers.next().getName().toString()).isEqualTo("another-nested.jar");
+		assertThat(headers.next().getName().toString()).isEqualTo("space nested.jar");
 		assertThat(headers.hasNext()).isFalse();
 	}
 
diff --git a/spring-boot-project/spring-boot-tools/spring-boot-loader/src/test/java/org/springframework/boot/loader/jar/JarFileTests.java b/spring-boot-project/spring-boot-tools/spring-boot-loader/src/test/java/org/springframework/boot/loader/jar/JarFileTests.java
index c00f2f16fb..729264e99b 100644
--- a/spring-boot-project/spring-boot-tools/spring-boot-loader/src/test/java/org/springframework/boot/loader/jar/JarFileTests.java
+++ b/spring-boot-project/spring-boot-tools/spring-boot-loader/src/test/java/org/springframework/boot/loader/jar/JarFileTests.java
@@ -93,6 +93,7 @@ public class JarFileTests {
 		assertThat(entries.nextElement().getName()).isEqualTo("special/\u00EB.dat");
 		assertThat(entries.nextElement().getName()).isEqualTo("nested.jar");
 		assertThat(entries.nextElement().getName()).isEqualTo("another-nested.jar");
+		assertThat(entries.nextElement().getName()).isEqualTo("space nested.jar");
 		assertThat(entries.hasMoreElements()).isFalse();
 		URL jarUrl = new URL("jar:" + this.rootJarFile.toURI() + "!/");
 		URLClassLoader urlClassLoader = new URLClassLoader(new URL[] { jarUrl });
@@ -135,6 +136,7 @@ public class JarFileTests {
 		assertThat(entries.nextElement().getName()).isEqualTo("special/\u00EB.dat");
 		assertThat(entries.nextElement().getName()).isEqualTo("nested.jar");
 		assertThat(entries.nextElement().getName()).isEqualTo("another-nested.jar");
+		assertThat(entries.nextElement().getName()).isEqualTo("space nested.jar");
 		assertThat(entries.hasMoreElements()).isFalse();
 	}
 
diff --git a/spring-boot-project/spring-boot-tools/spring-boot-loader/src/test/java/org/springframework/boot/loader/jar/JarURLConnectionTests.java b/spring-boot-project/spring-boot-tools/spring-boot-loader/src/test/java/org/springframework/boot/loader/jar/JarURLConnectionTests.java
index 5c8234a5ec..58f655f547 100644
--- a/spring-boot-project/spring-boot-tools/spring-boot-loader/src/test/java/org/springframework/boot/loader/jar/JarURLConnectionTests.java
+++ b/spring-boot-project/spring-boot-tools/spring-boot-loader/src/test/java/org/springframework/boot/loader/jar/JarURLConnectionTests.java
@@ -134,6 +134,21 @@ public class JarURLConnectionTests {
 				.hasSameContentAs(new ByteArrayInputStream(new byte[] { 3 }));
 	}
 
+	@Test
+	public void connectionToEntryWithSpaceNestedEntry() throws Exception {
+		URL url = new URL("jar:file:" + getRelativePath() + "!/space nested.jar!/3.dat");
+		assertThat(JarURLConnection.get(url, this.jarFile).getInputStream())
+				.hasSameContentAs(new ByteArrayInputStream(new byte[] { 3 }));
+	}
+
+	@Test
+	public void connectionToEntryWithEncodedSpaceNestedEntry() throws Exception {
+		URL url = new URL(
+				"jar:file:" + getRelativePath() + "!/space%20nested.jar!/3.dat");
+		assertThat(JarURLConnection.get(url, this.jarFile).getInputStream())
+				.hasSameContentAs(new ByteArrayInputStream(new byte[] { 3 }));
+	}
+
 	@Test
 	public void getContentLengthReturnsLengthOfUnderlyingEntry() throws Exception {
 		URL url = new URL(new URL("jar", null, -1,