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  1. ,
    Expert tip

    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.

  2. ,
    Expert tip

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

Solutions on the web

via Oracle Community by 843798, 1 year ago
via JIRA by survivant, 1 year ago
via jakarta-cactus-user by sachin chaudhari, 2 years ago
invalid stream header
via JIRA by survivant, 2 years ago
via Oracle Community by 843841, 1 year ago
via Stack Overflow by Irina
, 8 months ago
invalid stream header: 3130300A invalid stream header	at	at	at je.speakking.client.Communicator.readObject(	at je.speakking.client.SpeakClient$