private PlatformTransactionManager transactionManager;
    
    public void setTransactionManager(PlatformTransactionManager transactionManager)
    {
        this.transactionManager = transactionManager;
    }

When the doGet() method is executed, transactionManager is null. If I try to get the transactionManager from the ContainerManager and assign it to the transactionManager field in the servlet, I get a ClassCastException.

If I revert the plugin to v1, the problem is gone. Was able to reproduce with Confluence 2.10-SNAPSHOT as of Oct 10, 2008.