Fix space

spring-boot-project/spring-boot-cli/src/main/java/org/springframework/boot/cli/command/archive/ArchiveCommand.java

@@ -125,7 +125,7 @@ abstract class ArchiveCommand extends OptionParsingCommand {
 			List<?> nonOptionArguments = new ArrayList<Object>(
 					options.nonOptionArguments());
 			Assert.isTrue(nonOptionArguments.size() >= 2, () -> "The name of the "
-					+ "resulting" + this.type + " and at least one source file must be "
+					+ "resulting " + this.type + " and at least one source file must be "
 					+ "specified");
 
 			File output = new File((String) nonOptionArguments.remove(0));