Jbpm 4.2 集成Spring问题 Error creating bean with name 'processEngine' -优快云博客

本文链接：https://blog.youkuaiyun.com/simon_21/article/details/83496588

本文介绍了解决JBPM 4.2在集成Spring时出现的问题，包括配置错误导致流程引擎无法启动的具体原因及修复步骤。通过修改jbpm配置文件，实现了正确的集成。

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使用Jbpm4.2 集成Spring 出现问题：

2009-11-12 15:49:51,640 ERROR [org.springframework.web.context.ContextLoader] - Context initialization failed
org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'processEngine' defined in file [......\WEB-INF\classes\spring\applicationContext-jbpm.xml]: Instantiation of bean failed; nested exception is org.springframework.beans.factory.BeanDefinitionStoreException: Factory method [public org.jbpm.api.ProcessEngine org.jbpm.pvm.internal.cfg.SpringConfiguration.buildProcessEngine()] threw exception; nested exception is java.lang.NullPointerException

Caused by: java.lang.NullPointerException
at org.jbpm.pvm.internal.cfg.ProcessEngineImpl.checkDb(ProcessEngineImpl.java:177)

userCommandService 为null

经调试发现，使用Spring后userCommandService 确实是null，
配置中缺少什么东西？未知。文档中并无特殊说明，
4.1没有出现问题~
应该是4.2的Bug

jBPM-4.2集成Spring的方法，请参考这里：
http://www.family168.com/jbpm4/spring-jbpm42.html

jBPM-4.2默认提供的与spring整合的文件存在重大问题，使用官方推荐的配置方式根本无法启动流程引擎，需要进行如下修改：

第1步：将下面的内容保存为jbpm.tx.spring42.cfg.xml：

<?xml version="1.0" encoding="UTF-8"?>

<jbpm-configuration>

  <process-engine-context>
    <command-service name="txRequiredCommandService">
      <skip-interceptor />
      <retry-interceptor />
      <environment-interceptor />
      <spring-transaction-interceptor />
    </command-service>

    <command-service name="newTxRequiredCommandService">
      <retry-interceptor />
      <environment-interceptor policy="requiresNew" />
      <spring-transaction-interceptor />
    </command-service>
  </process-engine-context>

  <transaction-context>
    <transaction />
    <hibernate-session />
  </transaction-context>

</jbpm-configuration>

第2步：将jbpm.tx.spring42.cfg.xml放在classpath下。

第3步：修改jbpm.cfg.xml，使用jbpm.tx.spring42.cfg.xml替换默认的jbpm.tx.spring.cfg.xml：

<?xml version="1.0" encoding="UTF-8"?>

<jbpm-configuration>

  <import resource="jbpm.default.cfg.xml" />
  <import resource="jbpm.businesscalendar.cfg.xml" />
  <import resource="jbpm.tx.spring42.cfg.xml" />
  <import resource="jbpm.jpdl.cfg.xml" />
  <import resource="jbpm.identity.cfg.xml" />

  <!-- Job executor is excluded for running the example test cases. -->
  <!-- To enable timers and messages in production use, this should be included. -->
  <!--
  <import resource="jbpm.jobexecutor.cfg.xml" />
  -->

  <import resource="jbpm.mail.templates.examples.xml" />

</jbpm-configuration>