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PORe-serializing JBPM process variables directly via MySQL
 

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  1. PORe-serializing JBPM process variables directly via MySQL
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    <p>I'm working with an application that uses JBPM 3.1 and MySQL. The core problem is that there are processes instances with variables that contain an older version of an external, non-JBPM <code>Serializable</code> class. When the main application is upgraded, these processes instances cause an exception to be thrown by JBPM since the SUID of a specific class instance has changed in the main application.</p> <p>I believe I have a method for fixing the deserialization process using the technique described in the following:</p> <p><a href="https://stackoverflow.com/questions/795470/how-to-deserialize-an-object-persited-in-a-db-now-when-the-obect-has-different-se">How to deserialize an object persisted in a db now when the object has different serialVersionUID</a></p> <p>However, my problem is figuring out where in MySQL JBPM stores process instance variables, so I can write a program that can interate over all the variables for all instances, an reserialize the variables so the offending class will have the new SUID, so JBPM can operate against the processes.</p> <p>My initial looking at the JBPM tables, it appears that the JBPM_BYTEARRAY and/or JBPM_BYTEBLOCK may be the tables to operate against. However, I'm unsure how to proceed. I'm guessing each process variable is stored in a wrapping container class. Is that class <code>org.jbpm.context.exe.VariableInstance</code>? Or is it something else?</p> <p>I figure if I have the proper jar files in the class path, and I know what the main class instance is that JBPM uses to store process variables in MySQL, I can deserialize the class (which will fix the SUID problem with the embedded problem class instance), and reserialize the class back. Since JBPM documentation does mention stuff about converters, I'm unsure if I have to replicate the conversion process JPBM does when deserializing, or if standard java deserialization is enough.</p>
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