If the Resource in the server.xml is defined with initSQL="" the method DataSource#getConnection() throws a NullPointerException. I would suggest to change this behaviour that the part in the org.apache.tomcat.jdbc.pool.DataSourceFactory class gets changed from

>>>
value = properties.getProperty(PROP_INITSQL);
if (value != null ) {
poolProperties.setInitSQL(value);
}
<<<

to

value = properties.getProperty(PROP_INITSQL);
if (value != null && ! "".equals(value)) {
poolProperties.setInitSQL(value);
}


java.lang.NullPointerException
        at org.apache.tomcat.jdbc.pool.ConnectionPool.setupConnection(ConnectionPool.java:276)
        at org.apache.tomcat.jdbc.pool.ConnectionPool.getConnection(ConnectionPool.java:180)
        at org.apache.tomcat.jdbc.pool.DataSourceProxy.getConnection(DataSourceProxy.java:124)