This provider provides support for sending exceptions from desktop Java, Scala, Sevlets & JSPs, Google App Engine, Play 2 and other JVM frameworks.

Installation

With Maven and Eclipse/another IDE

These instructions assume you have a Maven project with a POM file set up in Eclipse, but this is also applicable to other IDEs and environments.

1. Open your project's pom.xml in Eclipse. Click on Dependencies -> Add. In the pattern search box, type com.mindscapehq.

2. Add com.mindscape.raygun4java and com.mindscapehq.core, version 2.0.0.

   If you are working in a web environment, add com.mindscapehq.webprovider dependency too.

   If you wish to grab the example project, you can also get the sampleapp jar.

3. Save your POM, and the dependencies should appear in Maven Dependencies.

With Maven and a command shell

If editing the pom.xml directly, you can run mvn install from the directory containing your project's pom.xml. The pom.xml will need to contain something like:

<dependencies>
    <dependency>
        <groupId>com.mindscapehq</groupId>
        <artifactId>core</artifactId>
        <version>3.0.0</version>
    </dependency>
</dependencies>

POM for Web Projects

If you're using servlets, JSPs or similar, you'll need to also add:

<dependency>
    <groupId>com.mindscapehq</groupId>
    <artifactId>webprovider</artifactId>
    <version>3.0.0</version>
</dependency>

With Ant or other build tools

Download the JARs for the latest version from here:

raygun-core: required

raygun-webprovider: optional - if you want to receive HTTP request data from JSPs, servlets, GAE, web frameworks etc.

gson: required - you will also need the Gson dependency in your classpath.

Basic Usage

An instance of the RaygunClient holds all the data for tracking errors, such as user information, tags etc. Whether your application is single user desktop application and/or multi-user server application, it is highly recommended to use a single RaygunClient per process. For example, in a web context it is essential to use a new RaygunClient for each user request.

The most basic usage of Raygun is as follows:

1. Setup RaygunClient with configuration options
2. Add meta data such as the current user or tags to RaygunClient
3. Send exceptions using the RaygunClient

This example shows the absolute minimum to send an exception to Raygun:

new RaygunClient("paste_your_api_key_here").send(new Exception("my first error"));

or for an unhandled exception (the client simply adds a tag so that you know that it was unhandled):

new RaygunClient("paste_your_api_key_here").sendUnhandled(new Exception("my first error"));

While this is extremely simple, that is not the recommended usage: as your application complexity increases, scattering that code snippet throughout your code base will become unwieldy. A good practice is to encapsulate the setup and access to the RaygunClient instance in a factory.

Using a factory and dependency injection to manage your RaygunClient use will greatly reduce the complexity of your code. You can make your own factories or use the ones provided which allow the configuring of the main features on the factories, which will produce RaygunClients with that configuration.

For example:

Setup

IRaygunClientFactory factory = new RaygunClientFactory("paste_your_api_key_here")
    .withVersion("1.2.3")
    .withTag("beta")
    .withData("prod", false);

Instantiate a client

RaygunClient client = factory.newClient();

Send exceptions

client.send(anException);
client.send(anotherException);

Release

Deploy Raygun into your production environment for best results, or raise a test exception. Once we detect your first error event, the Raygun app will automatically update.

Going further

It's very good practice to have a new RaygunClient instance per process/request/thread, and you can use that throughout your code to add metadata and send errors to Raygun. To make it easily available to your code, you could dependency inject the client, but inevitably you'll end up passing the client around. There is, however, a simple pattern using ThreadLocal<RaygunClient> that can be used to make a single RaygunClient instance easily available throughout your code (the following class is not included in the core Raygun dependency as its important that this is not shared between multiple libraries using Raygun):

public class MyErrorTracker {
    private static ThreadLocal<RaygunClient> client = new ThreadLocal<RaygunClient>();
    private static IRaygunClientFactory factory;

    /**
     * Initialize this static accessor with the given factory during application setup
     * @param factory
     */
    public static void initialize(IRaygunClientFactory factory) {
        MyErrorTracker.factory = factory;
    }

    /**
     * Throughout your code, call get() to get a reference to the current instance
     * @return the raygun client for this thread
     */
    public static RaygunClient get() {
        RaygunClient raygunClient = client.get();
        if (raygunClient == null) {
            raygunClient = factory.newClient();
            client.set(raygunClient);
        }
        return raygunClient;
    }

    /**
     * Custom method to set our user
     * @param user
     */
    public static void setUser(User user) {
        get().setUser(new RaygunIdentifier(user.uniqueUserIdentifier)
            .withFirstName(user.firstName)
            .withFullName(user.fullName)
            .withEmail(user.emailAddress)
            .withUuid(user.uuid, true));
    }

    /**
     * Custom method to send exception
     * @param exception
     */
    public static void send(Exception exception) {
        get().send(exception);
    }

    /**
     * At the end of the user process/thread, it is essential to remove the current instance
     */
    public static void done() {
        client.remove();
    }

    /**
     * Sets given client to the current thread.
     * This can be useful when forking multiple processes.
     * Be sure to unset after use or pain will ensue.
     * @param toSet
     */
    public static void set(RaygunClient toSet) {
        client.set(toSet);
    }

    public static void destroy() {
        factory = null;
    }
}

public class MyApplication {

    public void startup() {
        MyErrorTracker.initialize(new RaygunClientFactory("paste_your_api_key_here")
                                        .withVersion("1.2.3"));
    }

    public void processUserRequest(User user) {
        try {
            MyErrorTracker.setUser(user);

            ....

        } catch (Exception e) {
            MyErrorTracker.send(e);
        } finally{
            MyErrorTracker.done();
        }
    }

}

Desktop applications

To catch all unhandled exceptions in your application, and to send them to Raygun you need to create your own Thread.UncaughtExceptionHandler

public class MyApp
{
    public static void main(String[] args)
    {
        Thread.setDefaultUncaughtExceptionHandler(new MyExceptionHandler(new RaygunClientFactory("paste_your_api_key_here")));
    }
}

class MyExceptionHandler implements Thread.UncaughtExceptionHandler
{
    private IRaygunClientFactory raygunClientFactory;

    public MyExceptionHandler(IRaygunClientFactory factory) {
        raygunClientFactory = factory;
    }

    @Override
    public void uncaughtException(Thread t, Throwable e) {
        RaygunClient client = raygunClientFactory.newClient();
        client.send(e);
    }
}

Web applications

When implementing web applications, you can use the webprovider (or webproviderjakarta for Jakarta EE applications) dependency to get a lot of out-of-the-box support. For example, the com.mindscapehq.raygun4java.webprovider.RaygunClient class provides the described ThreadLocal<RaygunClient> pattern. The RaygunServletFilter creates the RaygunClient for each request, intercepts and sends unhandled exceptions to Raygun, and removes the RaygunClient at the end of the request.

For the out-of-the-box implementation of capturing exceptions thrown out of your controllers, simply do the following:

1. In the servlet configuration step in your container (a method that provides a ServletContext) initialize a RaygunServletClientFactory and set it on to the RaygunClient static accessor

   IRaygunServletClientFactory factory = new RaygunServletClientFactory(apiKey, servletContext);
   RaygunClient.initialize(factory);

2. In the servlet configuration step in your container that allows you to add servlet filters, add a new DefaultRaygunServletFilter() - this filter will use the static accessor above.
3. Throughout your code, while in the context of a http request, you can use the RaygunClient.get() method to return the current instance of the client for that request.

   RaygunClient.get().send(exception);

Web applications - templates/JSP/JSF etc

Intercepting unhandled exceptions is a standard pattern used by the servlet Filter, and provided out-of-the-box by the com.mindscapehq.raygun4java.webprovider.DefaultRaygunServletFilter

Unfortunately, most web frameworks implement their own exception handling for exceptions that occur inside their presentation layer, and those exceptions are not percolated through the servlet filter, rather they are handled by the framework. (The DefaultRaygunServletFilter could be extended to detect the 500 status code without an exception, but by that point all the useful information about the exception is not available).

To capture exceptions that occur within the framework presentation layer (or any other area that is handling exceptions), refer to that frameworks documentation about handling exceptions, and send the exception to Raygun using the techniques described above (the static accessor will help out here)

Play 2 Framework

This provider now contains a dedicated Play 2 provider for automatically sending Java and Scala exceptions from Play 2 web apps. Feedback is appreciated if you use this provider in a Play 2 app. You can use the plain core-4.x.x provider from Scala, but if you use this dedicated Play 2 provider, HTTP request data is transmitted too.

Installation

With SBT

Add the following line to your build.sbt's libraryDependencies:

libraryDependencies ++= Seq(
    "com.mindscapehq" % "raygun4java-play2" % "4.0.0"
)

With Maven

Add the raygun4java-play2-4.x.x dependency to your pom.xml (following the instructions under 'With Maven and a command shell' at the top of this file).

Usage

To handle exceptions automatically, define a custom error handler by creating a class that inherits from HttpErrorHandler. For Play 2's newer versions, GlobalSettings.onError is no longer available. Instead, you should use HttpErrorHandler.

1. Add the following line to your conf/application.conf:

play.http.errorHandler = "com.raygun.CustomErrorHandler"

2. Create the custom error handler class:

In Java:

package com.raygun;
import play.*;
import play.mvc.*;
import play.mvc.Http.*;
import play.libs.concurrent.HttpExecutionContext;
import play.http.HttpErrorHandler;
import java.util.concurrent.CompletableFuture;
import java.util.concurrent.CompletionStage;
import com.mindscapehq.raygun4java.play2.RaygunPlayClient;
public class CustomErrorHandler implements HttpErrorHandler {
    private String apiKey = "paste_your_api_key_here";
    @Override
    public CompletionStage<Result> onClientError(Http.RequestHeader request, int statusCode, String message) {
        // Handle client errors if necessary. For simplicity, we'll just forward the request to Play's default error handling
        return CompletableFuture.completedFuture(Results.status(statusCode, "A client error occurred: " + message));
    }
    @Override
    public CompletionStage<Result> onServerError(Http.RequestHeader request, Throwable exception) {
    	RaygunPlayClient rg = new RaygunPlayClient(apiKey, request);
    	rg.sendAsync(exception);
    	// For simplicity, we'll just return a simple text response
    	return CompletableFuture.completedFuture(Results.internalServerError("An internal server error occurred."));
    }
}

In Scala:

While the example above is in Java, here's a quick Scala translation:

package com.raygun

import play.api.mvc._
import play.api.http.HttpErrorHandler

import com.mindscapehq.raygun4java.play2.RaygunPlayClient

import scala.concurrent._
import ExecutionContext.Implicits.global

class CustomErrorHandler extends HttpErrorHandler {

    private val apiKey = "paste_your_api_key_here"

    def onClientError(request: RequestHeader, statusCode: Int, message: String): Future[Result] = {
        // Handle client errors if necessary. For simplicity, we'll just forward the request to Play's default error handling
        Future.successful(Status(statusCode)(s"A client error occurred: $message"))
    }

    def onServerError(request: RequestHeader, exception: Throwable): Future[Result] = {
        val rg = new RaygunPlayClient(apiKey, request)
        rg.sendAsync(exception)
        // For simplicity, we'll just return a simple text response
        Future.successful(Results.InternalServerError("An internal server error occurred."))
    }
}

Or, if you want to send an exception explicitly in your controller:

In Scala:

import play.api.mvc.{Action, Controller, Request}
import com.mindscapehq.raygun4java.play2.RaygunPlayClient

class MyController extends Controller {

  def index = Action { implicit request =>
    val rg = new RaygunPlayClient("paste_your_api_key_here", request)
    val result = rg.send(new Exception("From Scala"))

    Ok(views.html.index(result.toString))
  }
}

Customers

You can configure Customers by calling client.setUser(RaygunIdentifier) to set the current user's data, which will be displayed in the dashboard. The setUser method requires a unique string as the first parameter. This could be the user's email address if available, or an internally unique ID representing the user. Any errors containing this string will be considered to come from that user.

Example:

RaygunIdentifier userIdentity = new RaygunIdentifier("662607004")
  .withEmail("ronald@example.com")
  .withFirstName("Ronald")
  .withFullName("Ronald Raygun")
  .withAnonymous(false)
  .withUuid("ABC-123");

client.setUser(userIdentity);

The string properties on a User have a maximum length of 255 characters. Users who have fields that exceed this amount will not be processed.

Custom data and tags

You can attatch custom data or tags on the factory so that all errors will be tagged ie:

IRaygunClientFactory factory = new RaygunClientFactory("paste_your_api_key_here")
    .withTag("tag1")
    .withTag("tag2")
    .withData("data1", 1)
    .withData("data2", 2);

RaygunClient client = factory.newClient();

or attach to the client so that the tags will be added to only errors send by this client instance:

client
    .withTag("tag1")
    .withTag("tag2")
    .withData("data1", 1)
    .withData("data2", 2);

or attach while sending the error:

client.send(exception, tags);

Breadcrumbs

You can set breadcrumbs to record the flow through your application. Breadcrumbs are set against the current RaygunClient.

You can simply set a breadcrumb message:

client.recordBreadcrumb("I was here");

client.recordBreadcrumb("hello world")
    .withCategory("greeting")
    .withLevel(RaygunBreadcrumbLevel.WARN)
    .withCustomData(someData);

RaygunClientFactory factory = new RaygunClientFactory("paste_your_api_key_here")
    .withBreadcrumbLocations()

Version tracking

By default, Raygun4Java reads the manifest file for Specification-Version or Implementation-Version - make sure that your pom packaging sets either of them correctly.

When using Raygun4Java core the /META-INF/MANIFEST.MF file in the main executing .jar is used. When using Raygun4Java webprovider the /META-INF/MANIFEST.MF from the .war file.

In the case where your code is neither of the stated situations, you can pass in a class from your jar so that the correct version can be extracted i.e.

RaygunClientFactory factory = new RaygunClientFactory("paste_your_api_key_here").setVersionFrom(AClassFromMyApplication.class);

A setVersion(string) method is also available to manually specify this version (for instance during testing). It is expected to be in the format X.X.X.X, where X is a positive integer.

RaygunClientFactory factory = new RaygunClientFactory("paste_your_api_key_here").setVersion("1.2.3.4");

Getting/setting/cancelling the error before it is sent

This provider has an OnBeforeSend API to support accessing or mutating the candidate error payload immediately before it is sent, or cancelling the send outright.

This is provided as the public method RaygunClient.setOnBeforeSend(RaygunOnBeforeSend), which takes an instance of a class that implements the IRaygunOnBeforeSend interface. Your class needs a public onBeforeSend method that takes a RaygunMessage parameter, and returns the same.

By example:

class BeforeSendImplementation implements IRaygunOnBeforeSend {
    @Override
    public RaygunMessage onBeforeSend(RaygunMessage message) {
        // About to post to Raygun, returning the payload as is...
        return message;
    }
}

class MyExceptionHandler implements Thread.UncaughtExceptionHandler {
    public void uncaughtException(Thread t, Throwable e) {
        RaygunClient client = new RaygunClient("paste_your_api_key_here");
        client.setOnBeforeSend(new BeforeSendImplementation());
        client.send(e, tags, customData);
    }
}


public class MyProgram {
    public static void main(String[] args) throws Throwable {
        Thread.setDefaultUncaughtExceptionHandler(new MyExceptionHandler());
    }
}

In the example above, the overridden onBeforeSend method will log an info message every time an error is sent.

Mutate the error payload

To mutate the error payload, for instance to change the message:

@Override
public RaygunMessage onBeforeSend(RaygunMessage message) {
    RaygunMessageDetails details = message.getDetails();
    RaygunErrorMessage error = details.getError();
    error.setMessage("Mutated message");

    return message;
}

Cancel the send

To cancel the send (prevent the error from reaching the Raygun dashboard) by returning null:

@Override
public RaygunMessage onBeforeSend(RaygunMessage message) {
    //Cancelling sending message to Raygun...
    return null;
}

Filtering

There are several provided classes for filtering, and you can use the RaygunOnBeforeSendChain to execute multiple RaygunOnBeforeSend

raygunClient.setOnBeforeSend(new RaygunOnBeforeSendChain()
        .filterWith(new RaygunRequestQueryStringFilter("queryParam1", "queryParam2").replaceWith("*REDACTED*"))
        .filterWith(new RaygunRequestHeaderFilter("header1", "header2"))
);

or if using the factory

RaygunClientFactory factory = new RaygunClientFactory("paste_your_api_key_here").withBeforeSend(new RaygunOnBeforeSendChain()
        .filterWith(new RaygunRequestQueryStringFilter("queryParam1", "queryParam2").replaceWith("*REDACTED*"))
        .filterWith(new RaygunRequestHeaderFilter("header1", "header2"))
);

Custom error grouping

You can override Raygun's default grouping logic for Java exceptions by setting the grouping key manually in onBeforeSend (see above):

@Override
public RaygunMessage onBeforeSend(RaygunMessage message) {
    RaygunMessageDetails details = message.getDetails();
    details.setGroupingKey("foo");
    return message;
}

Any error instances with a certain key will be grouped together. The example above will place all errors within one group (as the key is hardcoded to 'foo'). The grouping key is a String and must be between 1 and 100 characters long. You should send all data you care about (for instance, parts of the exception message, stacktrace frames, class names etc) to a hash function (for instance MD5), then pass that to setGroupingKey.

Strip wrapping exceptions It is very common for exceptions to be wrapped in other exceptions whose stack trace does not contribute to the report. For example ServletExceptions often wrap the application exception that is of interest. If you don't want the outer/wrapping exception sent, the RaygunStripWrappedExceptionFilter can remove them for you:

factory.withBeforeSend(new RaygunStripWrappedExceptionFilter(ServletException.class));

factory.withWrappedExceptionStripping(ServletException.class);

Exlcuding exceptions It is very common for exceptions such as AccessDeniedException to be thrown that do not need to be reported to the developer the RaygunExcludeExceptionFilter can remove them for you:

factory.withBeforeSend(new RaygunExcludeExceptionFilter(ServletException.class));

factory.withExcludedExceptions(ServletException.class);

Offline storage

If you want to record errors that occur while the client is unable to communicate with Raygun API, you can enable offline storage with the RaygunOnFailedSendOfflineStorageHandler This should be added by the factory so that it is configured correctly. By default it will attempt to create a storage directory in the working directory of the application, otherwise you can provide a writable directory

factory.withOfflineStorage()

factory.withOfflineStorage("/tmp/raygun")

Errors are stored in plain text and are sent when the next error occurs.

Global settings

There are some settings that will be set globally, as such you probably should not set these if you are writing a library that will be included into other systems.

Proxy To set an Http Proxy:

RaygunSettings.getSettings().setHttpProxy("https://myproxy.com", 123);

Connect timeout To set an Http connect timeout in milliseconds:

RaygunSettings.getSettings().setConnectTimeout(100);

Web specific features

Web specific factory The webprovider dependency adds a RaygunServletClientFactory which exposes convenience methods to add the provided filters.

IRaygunServletClientFactory factory = new RaygunServletClientFactory("paste_your_api_key_here", servletContext)
    .withLocalRequestsFilter()
    .withRequestFormFilters("password", "ssn", "creditcard")
    .withRequestHeaderFilters("auth")
    .withRequestQueryStringFilters("secret")
    .withRequestCookieFilters("sessionId")
    .withWrappedExceptionStripping(ServletException.class)
    .withHttpStatusFiltering(200, 401, 403)
    .addFilter(myOnBeforeSendHandler)

Sending asynchronously

Web projects that use RaygunServletClient can call sendAsync(), to transmit messages asynchronously. When sendAsync is called, the client will continue to perform the sending while control returns to the calling script or servlet. This allows the page to continue rendering and be returned to the end user while the exception message is trasmitted.

Overloads:

void sendAsync(*Throwable* throwable)
void sendAsync(*Throwable* throwable, *List* tags)
void sendAsync(*Throwable* throwable, *List* tags, Map userCustomData)

This provides a huge speedup versus the blocking send() method, and appears to be near instantaneous from the user's perspective.

No HTTP status code is returned from this method as the calling thread will have terminated by the time the response is returned from the Raygun API. A logging option will be available in future.

This feature is considered to be in Beta, and it is advised to test it in a staging environment before deploying to production. When in production it should be monitored to ensure no spurious behaviour (especially in high traffic scenarios) while the feature is in beta. Feedback is appreciated.

Google app engine: This method will not work from code running on GAE - see the troubleshooting section below.

Ignoring errors which specific http status code Sometimes unhandled exceptions are thrown that do not indicate an error. For example, an exception that represents a "Not Authorised" error might set a http status code of 401 onto the response. If you want to filter out errors by status code you can use the RaygunRequestHttpStatusFilter

factory.withBeforeSend(new RaygunRequestHttpStatusFilter(403, 401));

Ignoring errors from localhost Often developers will send errors from there local machine with the hostname localhost, if this is undesireable add the RaygunExcludeLocalRequestFilter

factory.withBeforeSend(new RaygunExcludeLocalRequestFilter());

Ignoring specific requests You can provide your own criteria to ignore requests with RaygunExcludeRequestFilter:

factory.withBeforeSend(new RaygunExcludeRequestFilter(new Filter () {
        boolean shouldFilterOut(RaygunRequestMessage requestMessage) {
            return requestMessage.getIpAddress().equals("127.0.0.1");    
        }
    }
));

Redacting/erasing various values There are provided filters to remove data before it is sent to Raygun, this is useful for removing personally identifiable information (PII) etc. Values can be removed from Cookies, Forms fields, Headers and Query String parameters:

RaygunClientFactory factory = new RaygunClientFactory("paste_your_api_key_here").withBeforeSend(new RaygunOnBeforeSendChain()
        .filterWith(new RaygunRequestQueryStringFilter("queryParam1", "queryParam2").replaceWith("*REDACTED*"))
        .filterWith(new RaygunRequestHeaderFilter("header1", "header2"))
        .filterWith(new RaygunRequestFormFilter("form1", "form2"))
        .filterWith(new RaygunRequestCookieFilter("cookie1", "cookie2"))
);

Troubleshooting

• When Maven runs the tests locally, Surefire might complain of unsupported major.minor version 51.0 - ensure you have JDK 7 set as your JAVA_HOME, or set the plugin goal for maven-surefire-plugin to be <configuration><jvm>${env.your_jre_7_home}/bin/java.exe</jvm></configuration> in the parent pom.

• Google App Engine: Raygun4Java is confirmed to work with projects built with GAE, however only limited environment data is available due to JDK library restrictions. The SendAsync methods also will not work, however you can place the Send() call in the Run() body of a background thread, or one of the other threading features in the App Engine API.