Never attempt to resolve local address for nested URLs

Update `nested:` Handler to always return `null` from `getHostAddress`
in an attempt to improve performance on Windows.

Fixes gh-46063

Author: philwebb

spring-boot-project/spring-boot-tools/spring-boot-loader/src/main/java/org/springframework/boot/loader/net/protocol/nested/Handler.java

@@ -17,6 +17,7 @@
 package org.springframework.boot.loader.net.protocol.nested;
 
 import java.io.IOException;
+import java.net.InetAddress;
 import java.net.URL;
 import java.net.URLConnection;
 import java.net.URLStreamHandler;
@@ -35,6 +36,13 @@ public class Handler extends URLStreamHandler {
 
 	private static final String PREFIX = "nested:";
 
+	@Override
+	protected InetAddress getHostAddress(URL url) {
+		// Some Windows users have reported that calls to java.net.URL.getHostAddress()
+		// can be slow. Since we only deal with local files we always return null here.
+		return null;
+	}
+
 	@Override
 	protected URLConnection openConnection(URL url) throws IOException {
 		return new NestedUrlConnection(url);

spring-boot-project/spring-boot-tools/spring-boot-loader/src/test/java/org/springframework/boot/loader/net/protocol/nested/HandlerTests.java

@@ -68,4 +68,11 @@ void assertUrlIsNotMalformedWhenUrlIsValidDoesNotThrowException() {
 		assertThatNoException().isThrownBy(() -> Handler.assertUrlIsNotMalformed(url));
 	}
 
+	@Test
+	void getHostAddressIsNull() throws Exception {
+		// gh-46063
+		String url = "nested:" + this.temp.getAbsolutePath() + "/!nested.jar";
+		assertThat(new Handler().getHostAddress(new URL(url))).isNull();
+	}
+
 }