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《Flowable 6.6.0 BPMN用户指南》3 The Flowable API3.1 流程引擎API和服务3.2 异常策略3.3 查询API（Query API）3.4 变量（Variables）3.5 瞬态变量（Transient variables）3.6 表达式（Expressions）3.7 表达式函数（Expression functions）3.8 单元测试3.9 单元测试调试3.10 Web应用程序中的流程引擎...

3.8 单元测试Business processes are an integral part of software projects and they should be tested in the same way normal application logic is tested: with unit tests. Since Flowable is an embeddable Java engine, writing unit tests for business processes is a

3.9 单元测试调试When using the in-memory H2 database for unit tests, the following instructions allow you to easily inspect the data in the Flowable database during a debugging session. The screenshots here are taken in Eclipse, but the mechanism should be simi

3.10 Web应用程序中的流程引擎The ProcessEngine is a thread-safe class and can easily be shared among multiple threads. In a web application, this means it is possible to create the process engine once when the container boots and shut down the engine when the contai

3.7 表达式函数（Expression functions）[Experimental] Expression functions have been added in version 6.4.0.To make working with process variables easier, a set of out-of-the-box functions is available, under the variables namespace.[实验性]6.4.0版中添加了表达式函数。为了更容易处

3.6 表达式（Expressions）Flowable uses UEL for expression-resolving. UEL stands for Unified Expression Language and is part of the EE6 specification (see the EE6 specification for detailed information).Expressions can be used in, for example, Java Service tas

3.5 瞬态变量（Transient variables）Transient variables are variables that behave like regular variables, but are not persisted. Typically, transient variables are used for advanced use cases. When in doubt, use a regular process variable.The following applies

3.4 变量（Variables）Every process instance needs and uses data to execute the steps it’s made up of. In Flowable, this data is called variables, which are stored in the database. Variables can be used in expressions (for example, to select the correct outgoi

3.3 查询API（Query API）There are two ways of querying data from the engine: the query API and native queries. The Query API allows you to program completely typesafe queries with a fluent API. You can add various conditions to your queries (all of which are

3.2 异常策略The base exception in Flowable is the org.flowable.engine.FlowableException, an unchecked exception. This exception can be thrown at all times by the API, but ‘expected’ exceptions that happen in specific methods are documented in the javadocs. Fo

3 The Flowable API3.1 流程引擎API和服务The engine API is the most common way of interacting with Flowable. The main starting point is the ProcessEngine, which can be created in several ways as described in the configuration section. From the ProcessEngine, you