Due to bug in GlassFish 3.1.2 we are unable to upload files in Liferay 6.1 portal. The problem should be resolved in next GlassFish release. Liferay 6.1 bundle already comes with older version of GlassFish, but for manual installations we have to set up GlassFish server, database, deploy portal .war file and try upload several files, before we notice the bug.
Link to Liferay issue: http://issues.liferay.com/browse/LPS-25899.
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Memory leak 