Thanks Andrea.
The Alfresco repository (alfresco.war) running must be Enterprise 3.3.3 or later.
I read the document and noticed that "The Alfresco repository (alfresco.war) running must be Enterprise 3.3.3 or later.", does that mean only the Alfresco EE provides the DocLib Portlet? How about the Alfresco CE? Thanks!
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Alfresco 4.0.2 Documentation > Installing
Installing and configuring Alfresco DocLib Portlets
This describes how to install and configure Alfresco DocLib Portlets within Liferay. DocLib Portlets provide the rich document management capabilities of the Share Document Library page component within a portal. This feature consists of three portlets for accessing Share sites and the Alfresco repository. In the Share sites portlet, you have access to the sites you are already a member of and all public sites.
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Before proceeding with the installation and configuration, ensure the following:
The Alfresco repository (alfresco.war) running must be Enterprise 3.3.3 or later.
Alfresco has been installed using the installers or is running in a Tomcat 6 container.
Liferay Portal 5.2.3 or Liferay Portal 6.0 GA3 is installed and working.
The Java version must be a supported version for use with Alfresco: OpenJDK 1.6.0.2, IBM JDK 1.6 (Latest), ir JDK 6 u27 x64
The administrative user knows the location where Liferay is deployed.
The required modifications have been completed if you are using Tomcat 6. The modifications must be made for both Alfresco and Liferay if you are using different servers.
The deployed version of share.war in Liferay must be the same as the deployed version of alfresco.war.
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