Eclipse版本：Luna Service Release 2 (4.4.2)
报错信息如下：
Cannot complete the install because one or more required items could not be found.
Software being installed: Activiti Eclipse BPMN 2.0 Designer 5.18.0.201508100929 (org.activiti.designer.feature.feature.group 5.18.0.201508100929)
Missing requirement: Activiti Eclipse BPMN 2.0 Designer 5.18.0.201508100929 (org.activiti.designer.feature.feature.group 5.18.0.201508100929) requires 'org.eclipse.emf.transaction 1.4.0' but it could not be found
解决方法：
将以下三个jar包复制到Eclipse的plugins目录下并重启Eclipse即可。
1、org.eclipse.emf.transaction_1.4.0.v20100331-1738.jar
2、org.eclipse.emf.validation_1.7.0.201306111341.jar
3、org.eclipse.emf.workspace_1.5.1.v20120328-0001.jar
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