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C3P0: pool is already maxed out

Can someone tell me what this means? I recently converted almost all of my code to try-with-resources so that cleanup of connections would be less problematic. I’m assuming that I’m out of the number of connections that C3P0 will handle without additional configuration. This is a mostly single thr…

how to convert time in miliseconds to timeInSeconds and offsetInNanos?

I had this function that convert string type of date to unix timestamp, how to convert the result to timeInSeconds and offsetInNanos Answer Edit I think it convert “2016-06-21-10-19-22” to 2016-06-21T00:00:00+00:00, how to solve this problem, to convert both date with time and date without time to…

ElasticSearch – Failed to obtain node locks

I have a single node ElasticSearch Cluster in local. I am unable to start elasticsearch service. Getting this error: I have tried the answers of this and this post but couldn’t resolve. OS: RedHat 7.5 All directories in elasticsearch have write permission There is no other elastic instance running , I h…

parallelStream() java 1.8 vs 11

Consider the following code: When it is compiled and run with java 11, it returns the following: But with java 1.8, it returns different result: Why results are different? Answer Both results are consistent with the Java Memory Model. One possible ordering in which execution occurs is: but, because you don&#8…