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Activiti runs on a JDK higher than or equal to version 7. Go to Oracle Java SE downloads and click on button "Download JDK". There are installation instructions on that page as well. To verify that your installation was successful, run java -version on the command line. That should print the installed version of your JDK.

Activiti development can be done with the IDE of your choice. If you would like to use the Activiti Designer then you need Eclipse Kepler or Luna.Download the eclipse distribution of your choice from the Eclipse download page. Unzip the downloaded file and then you should be able to start it with the eclipse file in the directory eclipse.Further in this user guide, there is a section on installing our eclipse designer plugin.

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All classes that have .impl. in the package name are internal implementation classes and cannot be considered stable. However, if the user guide mentions those classes as configuration values, they are supported and can be considered stable.

In the jar file, all classes in packages that have .impl. (e.g. org.activiti.engine.impl.db) in them are implementation classes and should be considered internal. No stability guarantees are given on classes or interfaces that are in implementation classes.

To get the Activiti UI and REST web applications running just copy the WARs downloaded from the Activiti download page to the webapps folder in your Tomcat installation directory. By default the UI application runs with an in-memory database.

Note that the Activiti UI app demo setup is a way of showing the capabilities and functionality of Activiti as easily and as fast as possible. This does however, not meanthat it is the only way of using Activiti. As Activiti is just a jar, it can be embedded in any Java environment: with swing or on a Tomcat, JBoss, WebSphere, etc. Or you could very well choose to run Activiti as a typical, standalone BPM server. If it is possible in Java, it is possible with Activiti!

As said in the one minute demo setup, the Activiti UI app runs an in-memory H2 database by default. To run the Activiti UI app with a standalone H2 or another database the activiti-app.properties in the WEB-INF/classes/META-INF/activiti-app of the Activiti UI web application should be changed.

To include the Activiti jar and its dependent libraries, we advise using Maven (or Ivy), as it simplifies dependency management on both our and your side a lot. Follow the instructions at to include the necessary jars in your environment.

Playing around with the Activiti UI web application is a good way to get familiar with the Activiti concepts and functionality. However, the main purpose of Activiti is of course to enable powerful BPM and workflow capabilities in your own application. The following chapters will help you to get familiar with how to use Activiti programmatically in your environment:

This will look for an activiti.cfg.xml file on the classpath and construct an engine based on the configuration in that file. The following snippet shows an example configuration. The following sections will give a detailed overview of the configuration properties.

Note that the configuration XML is in fact a Spring configuration. This does not mean that Activiti can only be used in a Spring environment! We are simply leveraging the parsing and dependency injection capabilities of Spring internally for building up the engine.

All these ProcessEngineConfiguration.createXXX() methods return a ProcessEngineConfiguration that can further be tweaked if needed. After calling the buildProcessEngine() operation, a ProcessEngine is created:

org.activiti.engine.impl.cfg.StandaloneProcessEngineConfiguration: the process engine is used in a standalone way. Activiti will take care of the transactions. By default, the database will only be checked when the engine boots (and an exception is thrown if there is no Activiti schema or the schema version is incorrect).

org.activiti.engine.impl.cfg.StandaloneInMemProcessEngineConfiguration: this is a convenience class for unit testing purposes. Activiti will take care of the transactions. An H2 in-memory database is used by default. The database will be created and dropped when the engine boots and shuts down. When using this, probably no additional configuration is needed (except when using for example the job executor or mail capabilities).

The data source that is constructed based on the provided JDBC properties will have the default MyBatis connection pool settings. The following attributes can optionally be set to tweak that connection pool (taken from the MyBatis documentation):

jdbcMaxWaitTime: This is a low level setting that gives the pool a chance to print a log status and re-attempt the acquisition of a connection in the case that it is taking unusually long (to avoid failing silently forever if the pool is misconfigured) Default is 20000 (20 seconds).

Our benchmarks have shown that the MyBatis connection pool is not the most efficient or resilient when dealing with a lot of concurrent requests. As such, it is advised to us a javax.sql.DataSource implementation and inject it into the process engine configuration (For example DBCP, C3P0, Hikari, Tomcat Connection Pool, etc.):

By using JNDI (Java Naming and Directory Interface) to obtain the database connection, the connection is fully managed by the Servlet Container and the configuration can be managed outside the war deployment. This also allows more control over the connection parameters than what is provided by the db.properties file.

Configuration of the JNDI datasource will differ depending on what servlet container application you are using. The instructions below will work for Tomcat, but for other container applications, please refer to the documentation for your container app.

If using Tomcat, the JNDI resource is configured within $CATALINA_BASE/conf/[enginename]/[hostname]/[warname].xml (for the Activiti UI this will usually be $CATALINA_BASE/conf/Catalina/localhost/activiti-app.xml). The default context is copied from the Activiti war file when the application is first deployed, so if it already exists, you will need to replace it. To change the JNDI resource so that the application connects to MySQL instead of H2, for example, change the file to the following:

However, often only database administrators can execute DDL statements on a database. On a production system, this is also the wisest of choices. The SQL DDL statements can be found on the Activiti downloads page or inside the Activiti distribution folder, in the database subdirectory. The scripts are also in the engine jar (activiti-engine-x.jar), in the package org/activiti/db/create (the drop folder contains the drop statements). The SQL files are of the form

identity: the tables containing users, groups and memberships of users to groups. These tables are optional and should be used when using the default identity management as shipped with the engine.

history: the tables that contain the history and audit information. Optional: not needed when history level is set to none. Note that this will also disable some features (such as commenting on tasks) which store the data in the history database.

5.6.0 - 5.6.3: No millisecond precision available. Auto creation/update will NOT work. It is advised to upgrade to a newer database version anyway. DDL files for mysql 5.5 could be used if really needed.

The database names of Activiti all start with ACT_. The second part is a two-character identification of the use case of the table. This use case will also roughly match the service API.

ACT_RU_*: RU stands for runtime. These are the runtime tables that contain the runtime data of process instances, user tasks, variables, jobs, etc. Activiti only stores the runtime data during process instance execution, and removes the records when a process instance ends. This keeps the runtime tables small and fast.

By default, a version check will be performed each time a process engine is created. This typically happens once at boot time of your application or of the Activiti webapps. If the Activiti library notices a difference between the library version and the version of the Activiti database tables, then an exception is thrown.

Also, include a suitable database driver for your database to the classpath. Upgrade the Activiti libraries in your application. Or start up a new version of Activiti and point it to a database that contains an older version. With databaseSchemaUpdate set to true, Activiti will automatically upgrade the DB schema to the newer version the first time when it notices that libraries and DB schema are out of sync.

The async executor of Activiti 5 is the only available job executor in Activiti 6 as it is a more performant and more database friendly way of executing asynchronous jobs in the Activiti Engine.The old job executor of Activiti 5 is removed. More information can be found in the advanced section of the user guide.

Moreover, if running under Java EE 7, JSR-236 compliant ManagedAsyncJobExecutor can be used for letting the container manage the threads. In order to enable them, the thread factory should be passed in the configuration as follows:

The AsyncExecutor is a component that manages a thread pool to fire timers and other asynchronous tasks. Other implementations are possible (for example using a message queue, see the advanced section of the user guide).

Configuring a mail server is optional. Activiti supports sending e-mails in business processes. To actually send an e-mail, a valid SMTP mail server configuration is required. See the e-mail task for the configuration options.

By default, all beans that you specify in the activiti.cfg.xml configuration or in your own Spring configuration file are available to expressions and in the scripts. If you want to limit the visibility of beans in your configuration file, you can configure a property called beans in your process engine configuration. The beans property in ProcessEngineConfiguration is a map. When you specify that property, only beans specified in that map will be visible to expressions and scripts. The exposed beans will be exposed with the names as you specify in that map.