Polish "Print the java version being used on startup"

See gh-21559

Author: wilkinsona

spring-boot-project/spring-boot/src/test/java/org/springframework/boot/StartupInfoLoggerTests.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2012-2019 the original author or authors.
+ * Copyright 2012-2020 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -16,10 +16,14 @@
 
 package org.springframework.boot;
 
+import java.net.InetAddress;
+import java.net.UnknownHostException;
+
 import org.apache.commons.logging.Log;
 import org.junit.jupiter.api.Test;
 import org.mockito.ArgumentCaptor;
 
+import org.springframework.boot.system.ApplicationPid;
 import org.springframework.util.StopWatch;
 
 import static org.assertj.core.api.Assertions.assertThat;
@@ -38,12 +42,15 @@ class StartupInfoLoggerTests {
 	private final Log log = mock(Log.class);
 
 	@Test
-	void sourceClassIncluded() {
+	void startingFormat() throws UnknownHostException {
 		given(this.log.isInfoEnabled()).willReturn(true);
 		new StartupInfoLogger(getClass()).logStarting(this.log);
 		ArgumentCaptor<Object> captor = ArgumentCaptor.forClass(Object.class);
 		verify(this.log).info(captor.capture());
-		assertThat(captor.getValue().toString()).startsWith("Starting " + getClass().getSimpleName());
+		assertThat(captor.getValue().toString()).matches("Starting " + getClass().getSimpleName() + " using Java "
+				+ System.getProperty("java.version") + " on " + InetAddress.getLocalHost().getHostName() + " with PID "
+				+ new ApplicationPid() + " \\(started by " + System.getProperty("user.name") + " in "
+				+ System.getProperty("user.dir") + "\\)");
 	}
 
 	@Test