What’s the difference between Future and Promise? They both act like a placeholder for future results, but where is the main difference?
COPY FROM and C3PO connection pool in Postgres
I have the follow code in my JAVA program that allows me to copy data from a file into my Postgres database: This code works fine, but I would like to use a connection pool to manage my connections, as I have this code running for numerous files. So I used C3P0. However, when i get a connection from the
Convert JSON String to Pretty Print JSON output using Jackson
This is the JSON string I have: I need to convert the above JSON String into Pretty Print JSON Output (using Jackson), like below: Can anyone provide me an example based on my example above? How to achieve this scenario? I know there are lot of examples, but I am not able to understand those properly. Any hel…
Thymeleaf: how to get URL attribute value
I can’t find any solution for getting attribute from URL using Thymeleaf. For example, for URL: I need to get “error” attribute value. Also I’m using SpringMVC, if it could be helpful. Answer After some investigation I found that it was Spring EL issue actually. So complete answer with…
How to suppress FindBugs warnings for fields or local variables?
I would like to suppress FindBugs warnings for specific fields or local variables. FindBugs documents that the Target can be Type, Field, Method, Parameter, Constructor, Package for its edu.umd.cs.findbugs.annotations.SuppressWarning annotation [1]. But it does not work for me to annotate the field, only when…
Creating ASN1 encoded signature in C# to send to Java
I have a private/public secure cert. My Java counterparts have the public key. I have the need to take a string, sign it, and send it along to Java to then verify the data and signature. There appears to be a well known issue with how Microsoft and the rest of the world encodes/signs data, something about the…
How to check heap usage of a running JVM from the command line?
Can I check heap usage of a running JVM from the commandline, I mean the actual usage rather than the max amount allocated with Xmx. I need it to be commandline because I don’t have access to a …
Hibernate startup very slow
For some reason, the startup of my hibernate application is unbarrably slow. (up to 2 min) I have been thinking that the c3p0 configuration is plain wrong (related question) but studying the logs shows, that there is no activity just after the connection to the server is established. Also, using the built-in …
Append a single character to a string or char array in java?
Is it possible to append a single character to the end of array or string in java. Example: Answer
How to close a spring ApplicationContext?
After my application finishes I want to close the spring context. The relevant code has an ApplicationContext reference but I couldn’t find a close method. Answer Downcast your ApplicationContext to ConfigurableApplicationContext which defines close() method: