创建流程引擎
正如之前在maven依赖关系摘要中所建议的，Activiti利用Simple Logging Facade for Java（slf4j）进行日志记录，在此示例应用程序中，我们将使用log4j日志记录实现，将log4j.properties文件添加到项目中。
文件：$mvnProject/src/main/resources/log4j.properties
log4j.rootLogger=DEBUG, ACT
log4j.appender.ACT=org.apache.log4j.ConsoleAppender
log4j.appender.ACT.layout=org.apache.log4j.PatternLayout
log4j.appender.ACT.layout.ConversionPattern= %d{hh:mm:ss,SSS} [%t] %-5p %c %x - %m%n创建一个新类，包含空的main方法。
文件：$mvnProject/src/main/java/com/example/OnboardingRequest.java
package com.example;
public class OnboardingRequest {
public static void main(String[] args) {
}
}添加到main入口点的是创建流程引擎，添加到OnboardingRequest.java，如下图所示：
package com.example;
import org.activiti.engine.ProcessEngine;
import org.activiti.engine.ProcessEngineConfiguration;
import org.activiti.engine.impl.cfg.StandaloneProcessEngineConfiguration;
public class OnboardingRequest {
public static void main(String[] args) {
ProcessEngineConfiguration cfg = new StandaloneProcessEngineConfiguration()
.setJdbcUrl("jdbc:h2:mem:activiti;DB_CLOSE_DELAY=1000")
.setJdbcUsername("sa")
.setJdbcPassword("")
.setJdbcDriver("org.h2.Driver")
.setDatabaseSchemaUpdate(ProcessEngineConfiguration.DB_SCHEMA_UPDATE_TRUE);
ProcessEngine processEngine = cfg.buildProcessEngine();
String pName = processEngine.getName();
String ver = ProcessEngine.VERSION;
System.out.println("ProcessEngine [" + pName + "] Version: [" + ver + "]");
}
}- 导入Activiti流程引擎和配置。
- 导入独立环境的配置助手（例如，不使用依赖关系管理器）
- 使用基于内存的h2嵌入式数据库创建流程引擎。
- 显示流程引擎配置和Activiti版本。
Activiti支持依赖注入：
- Activiti专为并且可以轻松利用依赖注入而构建，有关详细信息，请查看Activiti用户指南。
Activiti发布了许多数据库提供商：
- “
$actUnzipedPack/database/create”中的数据库脚本 - Activiti用户指南（各种开发和管理部分）
支持IDE和平台无关的配置，并为此快速入门提供简单性，将一个“fat jar”配置添加到pom.xml中，如下面的所示。
文件：$mvnProject/pom.xml
...
...
...
org.apache.maven.plugins
maven-assembly-plugin
2.4.1
jar-with-dependencies
com.example.OnboardingRequest
make-assembly
package
single
...
...
...
通过运行“mvn package”打包代码。
命令：mvn package
基础路径：$mvnProject
[INFO] Scanning for projects...
[INFO]
[INFO] ------------------------------------------------------------------------
[INFO] Building $quickStartJavaProjectName 0.0.1-SNAPSHOT
[INFO] ------------------------------------------------------------------------
[INFO]
[INFO] --- maven-resources-plugin:2.6:resources (default-resources) @ $quickStartJavaProjectName ---
[WARNING] Using platform encoding (UTF-8 actually) to copy filtered resources, i.e. build is platform dependent!
[INFO] Copying 1 resource
[INFO]
[INFO] --- maven-compiler-plugin:3.5.1:compile (default-compile) @ HelloProcess2 ---
[INFO] Nothing to compile - all classes are up to date
[INFO]
[INFO] --- maven-resources-plugin:2.6:testResources (default-testResources) @ HelloProcess2 ---
[WARNING] Using platform encoding (UTF-8 actually) to copy filtered resources, i.e. build is platform dependent!
[INFO] Copying 0 resource
[INFO]
[INFO] --- maven-compiler-plugin:3.5.1:testCompile (default-testCompile) @ HelloProcess2 ---
[INFO] Nothing to compile - all classes are up to date
[INFO]
[INFO] --- maven-surefire-plugin:2.12.4:test (default-test) @ HelloProcess2 ---
[INFO]
[INFO] --- maven-jar-plugin:2.4:jar (default-jar) @ HelloProcess2 ---
[INFO] Building jar: $mvnProject/target/$quickStartJavaProjectName-0.0.1-SNAPSHOT.jar
[INFO] META-INF/maven/$quickStartJavaProjectName/HelloProcess2/pom.xml already added, skipping
[INFO] META-INF/maven/$quickStartJavaProjectName/$quickStartJavaProjectName/pom.properties already added, skipping
[INFO]
[INFO] --- maven-assembly-plugin:2.4.1:single (make-assembly) @ $quickStartJavaProjectName ---
[INFO] Building jar: $mvnProject/target/$quickStartJavaProjectName-0.0.1-SNAPSHOT-jar-with-dependencies.jar
[INFO] ------------------------------------------------------------------------
[INFO] BUILD SUCCESS
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 3.029s
[INFO] Finished at: Sun Nov 27 07:23:43 EST 2016
[INFO] Final Memory: 33M/702M
[INFO] ------------------------------------------------------------------------
- 你的输出可能看起来不同，这里的重要输出是“BUILD SUCCESS”之上的行，显示了jar依赖的成功：
- “[INFO] Building jar: $mvnProject/target/$quickStartJavaProjectName-0.0.1-SNAPSHOT-jar-with-dependencies.jar”
支持IDE和平台独立以及本快速入门的简单性，从命令行运行Java程序，如下所示。
命令：java -jar target/ActivitiDeveloperQuickStart-0.0.1-SNAPSHOT-jar-with-dependencies.jar
或
java -jar target/$quickStartJavaProjectName-0.0.1-SNAPSHOT-jar-with-dependencies.jar
11:45:32,849 [main] DEBUG org.activiti.engine.impl.cfg.ProcessEngineConfigurationImpl - initializing datasource to db: jdbc:h2:mem:activiti;DB_CLOSE_DELAY=1000
11:45:32,856 [main] DEBUG org.apache.ibatis.logging.LogFactory - Logging initialized using 'class org.apache.ibatis.logging.slf4j.Slf4jImpl' adapter.
...
11:45:33,777 [main] DEBUG org.activiti.engine.impl.db.DbSqlSession - SQL: create table ACT_PROCDEF_INFO (
ID_ varchar(64) not null,
PROC_DEF_ID_ varchar(64) not null,
REV_ integer,
INFO_JSON_ID_ varchar(64),
primary key (ID_)
)
...
11:45:33,835 [main] DEBUG org.activiti.engine.impl.db.DbSqlSession - activiti db schema create for component identity successful
11:45:33,835 [main] DEBUG org.activiti.engine.impl.db.DbSqlSession - flush summary: 0 insert, 0 update, 0 delete.
11:45:33,835 [main] DEBUG org.activiti.engine.impl.db.DbSqlSession - now executing flush...
11:45:33,835 [main] DEBUG org.activiti.engine.impl.cfg.standalone.StandaloneMybatisTransactionContext - firing event committing...
11:45:33,835 [main] DEBUG org.activiti.engine.impl.cfg.standalone.StandaloneMybatisTransactionContext - committing the ibatis sql session...
11:45:33,835 [main] DEBUG org.activiti.engine.impl.cfg.standalone.StandaloneMybatisTransactionContext - firing event committed...
11:45:33,836 [main] DEBUG org.apache.ibatis.transaction.jdbc.JdbcTransaction - Resetting autocommit to true on JDBC Connection [conn0: url=jdbc:h2:mem:activiti user=SA]
11:45:33,836 [main] DEBUG org.apache.ibatis.transaction.jdbc.JdbcTransaction - Closing JDBC Connection [conn0: url=jdbc:h2:mem:activiti user=SA]
11:45:33,836 [main] DEBUG org.apache.ibatis.datasource.pooled.PooledDataSource - Returned connection 667346055 to pool.
11:45:33,836 [main] DEBUG org.activiti.engine.impl.interceptor.LogInterceptor - --- SchemaOperationsProcessEngineBuild finished --------------------------------------------------------
11:45:33,836 [main] DEBUG org.activiti.engine.impl.interceptor.LogInterceptor -
11:45:33,836 [main] INFO org.activiti.engine.impl.ProcessEngineImpl - ProcessEngine default created
ProcessEngine [default] Version: [$actVer]感兴趣的关键输出是打印你的Activiti版本：$actVer它应该与配置在“[INFO] Building jar: $mvnProject/target/$quickStartJavaProjectName-0.0.1-SNAPSHOT-jar-with-dependencies.jar”的版本匹配。
或者，当然，你可以在IDE中运行相同的程序，例如，从Eclipse中选择OnboardingRequest.java文件，然后右键单击“Run As> Java Application”。如果从IDE中运行程序，结果应该相同（通常显示在IDE的控制台视图中）。
你已经在这个简单的Java程序中成功嵌入了Activiti的BPM引擎。