Make BootRunIntegrationTests compatible with Java 9

Closes gh-10019

Author: wilkinsona

spring-boot-tools/spring-boot-gradle-plugin/src/test/java/com/example/BootRunApplication.java

@@ -16,8 +16,8 @@
 
 package com.example;
 
-import java.net.URL;
-import java.net.URLClassLoader;
+import java.io.File;
+import java.lang.management.ManagementFactory;
 
 /**
  * Very basic application used for testing {@code BootRun}.
@@ -32,11 +32,10 @@ protected BootRunApplication() {
 
 	public static void main(String[] args) {
 		int i = 1;
-		for (URL url : ((URLClassLoader) BootRunApplication.class.getClassLoader())
-				.getURLs()) {
-			System.out.println(i++ + ". " + url);
+		for (String entry : ManagementFactory.getRuntimeMXBean().getClassPath()
+				.split(File.pathSeparator)) {
+			System.out.println(i++ + ". " + entry);
 		}
-
 	}
 
 }

spring-boot-tools/spring-boot-gradle-plugin/src/test/java/org/springframework/boot/gradle/tasks/run/BootRunIntegrationTests.java

@@ -48,19 +48,25 @@ public void basicExecution() throws IOException {
 		new File(this.gradleBuild.getProjectDir(), "src/main/resources").mkdirs();
 		BuildResult result = this.gradleBuild.build("bootRun");
 		assertThat(result.task(":bootRun").getOutcome()).isEqualTo(TaskOutcome.SUCCESS);
-		assertThat(result.getOutput()).contains("1. " + urlOf("build/classes/java/main"));
-		assertThat(result.getOutput()).contains("2. " + urlOf("build/resources/main"));
-		assertThat(result.getOutput()).doesNotContain(urlOf("src/main/resources"));
+		assertThat(result.getOutput())
+				.contains("1. " + canonicalPathOf("build/classes/java/main"));
+		assertThat(result.getOutput())
+				.contains("2. " + canonicalPathOf("build/resources/main"));
+		assertThat(result.getOutput())
+				.doesNotContain(canonicalPathOf("src/main/resources"));
 	}
 
 	@Test
 	public void sourceResourcesCanBeUsed() throws IOException {
 		copyApplication();
 		BuildResult result = this.gradleBuild.build("bootRun");
 		assertThat(result.task(":bootRun").getOutcome()).isEqualTo(TaskOutcome.SUCCESS);
-		assertThat(result.getOutput()).contains("1. " + urlOf("src/main/resources"));
-		assertThat(result.getOutput()).contains("2. " + urlOf("build/classes/java/main"));
-		assertThat(result.getOutput()).doesNotContain(urlOf("build/resources/main"));
+		assertThat(result.getOutput())
+				.contains("1. " + canonicalPathOf("src/main/resources"));
+		assertThat(result.getOutput())
+				.contains("2. " + canonicalPathOf("build/classes/java/main"));
+		assertThat(result.getOutput())
+				.doesNotContain(canonicalPathOf("build/resources/main"));
 	}
 
 	@Test
@@ -98,9 +104,8 @@ private void copyApplication() throws IOException {
 		FileSystemUtils.copyRecursively(new File("src/test/java/com/example"), output);
 	}
 
-	private String urlOf(String path) throws IOException {
-		return new File(this.gradleBuild.getProjectDir().getCanonicalFile(), path).toURI()
-				.toURL().toString();
+	private String canonicalPathOf(String path) throws IOException {
+		return new File(this.gradleBuild.getProjectDir(), path).getCanonicalPath();
 	}
 
 }