invalid stream header: 31393030

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Update Tomcat container adapters to 1.0.0.CR8 or further. If that doesn't work, 0D0A3C21 in ASCII is <!, first characters in a HTML file, so, check if you're not reading a different file or if there's an issue with your deserialization.

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If you're using Liferay, check the steps in the last message on how to fix it:

Solutions on the web

via Stack Overflow by Eugene Goldberg
, 1 year ago
via Coderanch by Kuku Rigu, 1 year ago
via Oracle Community by 843790, 1 year ago
via Oracle Community by 843807, 1 year ago
via Oracle Community by 810721, 1 year ago invalid stream header: 31393030

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