THIS IS A TEST INSTANCE. ALL YOUR CHANGES WILL BE LOST!!!!
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When a Multipart request has non-file normal form fields, Struts used to bring them into memory as Strings without checking their sizes. This could lead to OOM if developer has set struts.multipart.maxSize to a value equal or greater than the available memory.
Solution
Upgrade to Struts 2.5.30.1 or 6.1.2.1 or greater.
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No issues expected when upgrading to Struts 2.5.30.1 or 6.1.2.1
Workaround
N/ASet struts.multipart.maxSize to a value much much smaller than the available memory.