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<title>Lab 4 - Introspection, Monitoring, and Metrics using Spring Boot Actuator</title>
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<body class="article">
<div id="header">
<h1>Lab 4 - Introspection, Monitoring, and Metrics using Spring Boot Actuator</h1>
</div>
<div id="content">
<div class="sect1">
<h2 id="_set_up_the_actuator">Set up the Actuator</h2>
<div class="sectionbody">
<div class="olist arabic">
<ol class="arabic">
<li>
<p>Change to the lab directory (or build off of lab_01, lab_02, or lab_03):</p>
<div class="listingblock">
<div class="content">
<pre>$ cd $COURSE_HOME/day_01/session_01/lab_04/initial/hello-spring-boot</pre>
</div>
</div>
</li>
<li>
<p>Import the project’s <code>pom.xml</code> into your editor/IDE of choice if you haven’t already done so in a previous lab.</p>
</li>
<li>
<p>To <code>pom.xml</code> add the following dependency to include the starter for Spring Boot Actuator:</p>
<div class="listingblock">
<div class="content">
<pre><dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-actuator</artifactId>
</dependency></pre>
</div>
</div>
</li>
</ol>
</div>
</div>
</div>
<div class="sect1">
<h2 id="_introspection_endpoints">Introspection Endpoints</h2>
<div class="sectionbody">
<div class="olist arabic">
<ol class="arabic">
<li>
<p>Build the application:</p>
<div class="listingblock">
<div class="content">
<pre>$ mvn package</pre>
</div>
</div>
</li>
<li>
<p>Run the application:</p>
<div class="listingblock">
<div class="content">
<pre>$ java -jar target/hello-spring-boot-0.0.1-SNAPSHOT.jar</pre>
</div>
</div>
</li>
<li>
<p>Try out the following endpoints. The output is omitted here because it can be quite large:</p>
<div class="dlist">
<dl>
<dt class="hdlist1"><a href="http://localhost:8080/beans" class="bare">http://localhost:8080/beans</a></dt>
<dd>
<p>Dumps all of the beans in the Spring context.</p>
</dd>
<dt class="hdlist1"><a href="http://localhost:8080/autoconfig" class="bare">http://localhost:8080/autoconfig</a></dt>
<dd>
<p>Dumps all of the auto-configuration performed as part of application bootstrapping.</p>
</dd>
<dt class="hdlist1"><a href="http://localhost:8080/configprops" class="bare">http://localhost:8080/configprops</a></dt>
<dd>
<p>Displays a collated list of all <code>@ConfigurationProperties</code>.</p>
</dd>
<dt class="hdlist1"><a href="http://localhost:8080/env" class="bare">http://localhost:8080/env</a></dt>
<dd>
<p>Dumps the application’s shell environment as well as all Java system properties.</p>
</dd>
<dt class="hdlist1"><a href="http://localhost:8080/mappings" class="bare">http://localhost:8080/mappings</a></dt>
<dd>
<p>Dumps all URI request mappings and the controller methods to which they are mapped.</p>
</dd>
<dt class="hdlist1"><a href="http://localhost:8080/dump" class="bare">http://localhost:8080/dump</a></dt>
<dd>
<p>Performs a thread dump.</p>
</dd>
<dt class="hdlist1"><a href="http://localhost:8080/trace" class="bare">http://localhost:8080/trace</a></dt>
<dd>
<p>Displays trace information (by default the last few HTTP requests).</p>
</dd>
</dl>
</div>
</li>
</ol>
</div>
</div>
</div>
<div class="sect1">
<h2 id="_build_and_version_control_info">Build and Version Control Info</h2>
<div class="sectionbody">
<div class="paragraph">
<p>Spring Boot provides an endpoint (<a href="http://localhost:8080/info" class="bare">http://localhost:8080/info</a>) that allows the exposure of arbitrary metadata.</p>
</div>
<div class="paragraph">
<p>One thing that it does well is expose information about the specific build and version control coordinates for a given deployment.</p>
</div>
<div class="olist arabic">
<ol class="arabic">
<li>
<p>Add the following plugin to your Maven build.
It will add Git branch and commit coordinates to the <code>/info</code> endpoint:</p>
<div class="listingblock">
<div class="content">
<pre><plugin>
<groupId>pl.project13.maven</groupId>
<artifactId>git-commit-id-plugin</artifactId>
<configuration>
<dotGitDirectory>../../../../../.git</dotGitDirectory>
</configuration>
</plugin></pre>
</div>
</div>
<div class="admonitionblock note">
<table>
<tr>
<td class="icon">
<div class="title">Note</div>
</td>
<td class="content">
The path <code>../../../../../.git</code> refers to the <code>.git</code> directory at the root of the course materials.
</td>
</tr>
</table>
</div>
</li>
<li>
<p>Add the following properties to <code>src/main/resources/application.yml</code>:</p>
<div class="listingblock">
<div class="content">
<pre>info:
build:
artifact: @project.artifactId@
name: @project.name@
description: @project.description@
version: @project.version@</pre>
</div>
</div>
<div class="paragraph">
<p>These will add the project’s Maven coordinates to the <code>/info</code> endpoint. The Spring Boot Maven plugin will cause them to automatically be replaced in the assembled JAR.</p>
</div>
</li>
<li>
<p>Build the application:</p>
<div class="listingblock">
<div class="content">
<pre>$ mvn package</pre>
</div>
</div>
</li>
<li>
<p>Run the application:</p>
<div class="listingblock">
<div class="content">
<pre>$ java -jar target/hello-spring-boot-0.0.1-SNAPSHOT.jar</pre>
</div>
</div>
</li>
<li>
<p>Visit the application in the browser (<a href="http://localhost:8080/info" class="bare">http://localhost:8080/info</a>), and verify that the output is similar to the following:</p>
<div class="listingblock">
<div class="content">
<pre>{
build: {
artifact: "hello-spring-boot",
name: "hello-spring-boot",
description: "Hello Spring Boot",
version: "0.0.1-SNAPSHOT"
},
git: {
branch: "master",
commit: {
id: "a15f771",
time: "2015-05-03T16:51:31-0400"
}
}
}</pre>
</div>
</div>
</li>
</ol>
</div>
</div>
</div>
<div class="sect1">
<h2 id="_health_indicators">Health Indicators</h2>
<div class="sectionbody">
<div class="paragraph">
<p>Spring Boot provides an endpoint (<a href="http://localhost:8080/health" class="bare">http://localhost:8080/health</a>) that allows for the notion of various health indicators.</p>
</div>
<div class="olist arabic">
<ol class="arabic">
<li>
<p>Normally, when Spring Security is not enabled, the <code>/health</code> endpoint will only expose an <code>UP</code> or <code>DOWN</code> value.
To simplify working with the endpoint for this lab, we will turn off its sensitivity.
Add the following to <code>src/main/resources/application.yml</code>:</p>
<div class="listingblock">
<div class="content">
<pre>endpoints:
health:
sensitive: false</pre>
</div>
</div>
</li>
<li>
<p>Create the class <code>io.pivotal.spring.hello.FlappingHealthIndicator</code> and into it paste the following code:</p>
<div class="listingblock">
<div class="content">
<pre>@Component
public class FlappingHealthIndicator implements HealthIndicator{
private Random random = new Random(System.currentTimeMillis());
@Override
public Health health() {
int result = random.nextInt(100);
if (result < 50) {
return Health.down().withDetail("flapper", "failure").withDetail("random", result).build();
} else {
return Health.up().withDetail("flapper", "ok").withDetail("random", result).build();
}
}
}</pre>
</div>
</div>
<div class="paragraph">
<p>This demo health indicator will randomize the health check.</p>
</div>
</li>
<li>
<p>Build the application:</p>
<div class="listingblock">
<div class="content">
<pre>$ mvn package</pre>
</div>
</div>
</li>
<li>
<p>Run the application:</p>
<div class="listingblock">
<div class="content">
<pre>$ java -jar target/hello-spring-boot-0.0.1-SNAPSHOT.jar</pre>
</div>
</div>
</li>
<li>
<p>Visit the application in the browser (<a href="http://localhost:8080/health" class="bare">http://localhost:8080/health</a>), and verify that the output is similar to the following (and changes randomly!):</p>
<div class="listingblock">
<div class="content">
<pre>{
status: "UP",
flapping: {
status: "UP",
flapper: "ok",
random: 69
},
diskSpace: {
status: "UP",
free: 113632186368,
threshold: 10485760
}
}</pre>
</div>
</div>
</li>
</ol>
</div>
</div>
</div>
<div class="sect1">
<h2 id="_metrics">Metrics</h2>
<div class="sectionbody">
<div class="paragraph">
<p>Spring Boot provides an endpoint (<a href="http://localhost:8080/metrics" class="bare">http://localhost:8080/metrics</a>) that exposes several automatically collected metrics for your application.
It also allows for the creation of custom metrics.</p>
</div>
<div class="olist arabic">
<ol class="arabic">
<li>
<p>Create the class <code>io.pivotal.spring.hello.GreetingService</code> and into it paste the following code:</p>
<div class="listingblock">
<div class="content">
<pre>@Component
public class GreetingService {
@Autowired
CounterService counterService;
@Value("${greeting}")
String greeting;
public String getGreeting() {
counterService.increment("counter.services.greeting.invoked");
return greeting;
}
}</pre>
</div>
</div>
<div class="paragraph">
<p>This class is using the <code>@Autowired</code> <code>CounterService</code> to count the number of times that the <code>getGreeting()</code> method has been invoked.</p>
</div>
</li>
<li>
<p>Refactor the contents of the class <code>io.spring.hello.HelloSpringBootApplication</code>:</p>
<div class="listingblock">
<div class="content">
<pre>@Autowired
private GreetingService greetingService;
@RequestMapping("/")
public String hello() {
return String.format("%s World!", greetingService.getGreeting());
}
public static void main(String[] args) {
SpringApplication.run(HelloSpringBootApplication.class, args);
}</pre>
</div>
</div>
<div class="paragraph">
<p><code>hello()</code> is now delegating the source of the greeting to our newly created <code>GreetingService</code>.</p>
</div>
</li>
<li>
<p>Build the application:</p>
<div class="listingblock">
<div class="content">
<pre>$ mvn package</pre>
</div>
</div>
</li>
<li>
<p>Run the application:</p>
<div class="listingblock">
<div class="content">
<pre>$ java -jar target/hello-spring-boot-0.0.1-SNAPSHOT.jar</pre>
</div>
</div>
</li>
<li>
<p>Visit the application in the browser (<a href="http://localhost:8080" class="bare">http://localhost:8080</a>) and refresh the page several times.</p>
</li>
<li>
<p>Now visit the <code>/metrics</code> endpoint (<a href="http://localhost:8080/metrics" class="bare">http://localhost:8080/metrics</a>).
Among the autogenerated metrics you should see a <code>counter</code> for the <code>GreetingService</code> invocations:</p>
<div class="listingblock">
<div class="content">
<pre>counter.services.greeting.invoked: 16,</pre>
</div>
</div>
<div class="paragraph">
<p>To learn more about the autogenerated metrics, visit <a href="http://docs.spring.io/spring-boot/docs/current/reference/html/production-ready-metrics.html" class="bare">http://docs.spring.io/spring-boot/docs/current/reference/html/production-ready-metrics.html</a>.</p>
</div>
</li>
</ol>
</div>
</div>
</div>
</div>
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Last updated 2015-06-13 19:24:51 EDT
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