Log inaccessible file in RandomAccessDataFile

Closes gh-11401

spring-boot-tools/spring-boot-loader/src/main/java/org/springframework/boot/loader/data/RandomAccessDataFile.java

@@ -64,7 +64,8 @@ public class RandomAccessDataFile implements RandomAccessData {
 			throw new IllegalArgumentException("File must not be null");
 		}
 		if (!file.exists()) {
-			throw new IllegalArgumentException("File must exist");
+			throw new IllegalArgumentException(String.format(
+					"File %s must exist", file.getAbsolutePath()));
 		}
 		this.file = file;
 		this.filePool = new FilePool(file, concurrentReads);

spring-boot-tools/spring-boot-loader/src/test/java/org/springframework/boot/loader/data/RandomAccessDataFileTests.java

@@ -106,7 +106,7 @@ public class RandomAccessDataFileTests {
 	@Test
 	public void fileExists() throws Exception {
 		this.thrown.expect(IllegalArgumentException.class);
-		this.thrown.expectMessage("File must exist");
+		this.thrown.expectMessage("File /does/not/exist must exist");
 		new RandomAccessDataFile(new File("/does/not/exist"));
 	}
 
@@ -120,7 +120,7 @@ public class RandomAccessDataFileTests {
 	@Test
 	public void fileExistsWithConcurrentReads() throws Exception {
 		this.thrown.expect(IllegalArgumentException.class);
-		this.thrown.expectMessage("File must exist");
+		this.thrown.expectMessage("File /does/not/exist must exist");
 		new RandomAccessDataFile(new File("/does/not/exist"), 1);
 	}