synchronization because synchronization is not active JDBC Connection

引用中提到了关于SqlSession未注册同步的错误讲述，指出了JDBC Connection不能被Spring所托管，因为同步注册未激活。而引用中的日志显示，由于同步未激活，JDBC Connection不会由Spring进行管理。

在引用中，介绍了一个特定路由的连接子池，由ConnPoolByRoute使用。该类中的方法是非同步的，预期是包含的连接池会处理同步。

综上所述，引用和都提到了synchronization not active的问题，即同步未激活，导致JDBC Connection无法被Spring管理。而引用也提到了连接子池的同步问题。所以可以得出结论，问题中提到的synchronization not active是指同步未激活，导致JDBC Connection无法被正确管理。<span class="em">1</span><span class="em">2</span><span class="em">3</span>
#### 引用[.reference_title]
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