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# OpenCensus Z-Pages
[![Build Status][travis-image]][travis-url] [![Build status][appveyor-image]][appveyor-url] [![Maven Central][maven-image]][maven-url]
The *OpenCensus Z-Pages for Java* is a collection of HTML pages to display stats and trace data and
allows library configuration control.
## Hello "Z-Pages"
### Add the dependencies to your project
For Maven add to your `pom.xml`:
```xml
<dependency>
<groupId>io.opencensus</groupId>
<artifactId>opencensus-contrib-zpages</artifactId>
<version>0.6.0</version>
</dependency>
```
For Gradle add to your dependencies:
```gradle
compile 'io.opencensus:opencensus-contrib-zpages:0.6.0'
```
### Register the Z-Pages
```java
public class MyMainClass {
public static void main(String[] args) throws Exception {
// ...
HttpServer server = HttpServer.create(new InetSocketAddress(8000), 10);
ZPageHandlers.registerAllToHttpServer(server);
server.start();
// ...
}
}
```
### FAQ
#### Why do I not see sampled spans based on latency and error codes for a given span name?
Sampled spans based on latency and error codes are available only for registered span names.
For more details see [SampledSpanStore][sampledspanstore-url].
[travis-image]: https://travis-ci.org/census-instrumentation/opencensus-java.svg?branch=master
[travis-url]: https://travis-ci.org/census-instrumentation/opencensus-java
[appveyor-image]: https://ci.appveyor.com/api/projects/status/hxthmpkxar4jq4be/branch/master?svg=true
[appveyor-url]: https://ci.appveyor.com/project/instrumentationjavateam/opencensus-java/branch/master
[maven-image]: https://maven-badges.herokuapp.com/maven-central/io.opencensus/opencensus-contrib-zpages/badge.svg
[maven-url]: https://maven-badges.herokuapp.com/maven-central/io.opencensus/opencensus-contrib-zpages
[sampledspanstore-url]: https://github.com/census-instrumentation/opencensus-java/blob/master/api/src/main/java/io/opencensus/trace/export/SampledSpanStore.java
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