Fastest way to send huge data from one DB to another vendor DB using Java

I have implemented some kind of ESB which able to read data from one DB vendor, transform it and send to another DB vendor using Java 8 and JDBC. I can't use any JPA because user is able to use any DB and any tables to transfer.

And for now I have performance issues on huge data, because I have to select data, convert to java objects, transform and send to another DB. For some DB vendors I can't use large batch sizes. As a result, multithreading is not helping...

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By: StackOverFlow - Saturday, 16 June

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