[PR] Add a statements pool to DatasourceResourceLoader to fix thread safety [velocity-engine]

arkanovicz opened a new pull request, #49:
URL: https://github.com/apache/velocity-engine/pull/49

   The rule of thumb for prepared statements is that a statement can only run one query at a time. To ensure that the DatasourceResourceLoader is thread-safe, but without impacting performances, this PR introduces prepared statements pooling.
   
   It does introduce a new dependency, commons-pool2. It is rather small and without any external dependency.
   


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