java

On upgrading Hibernate from version 3 to version 5, I got the above error. Turned out that we were also using Mockito and it also has a dependency on byte buddy. So there was conflict of versions of byet buddy. So here is fix: <dependency><groupId>org.mockito</groupId><artifactId>mockito-core</artifactId><version>2.2.28</version><scope>test</scope><exclusions><exclusion><groupId>net.bytebuddy</groupId><artifactId>byte-buddy</artifactId></exclusion></exclusions></dependency> exclude the byte-buddy jar from mockito.    

Recently we needed to reindex our data due to some changes. Here is how we did it. We defined a file on the file system. If that file is present the reindexing thread runs, so it would easy for our deployment team to run reindexing when needed. Here is the code creating the thread.  So … Read more

Recently we ended up in an issue with enums. One of the developers changed the order of enums because of a change he had to do. And he thought that enum values that are logically together should be put together in enum class also. But when he was done with the change, all the tests … Read more

Have you ever come across a situation that you need to do rate limiting to an api.  In this article we look at one of the ways rate limiting can be done. We would limit access to an api and make only 1 call to api within 2 seconds. This class would use threads and … Read more

In Java scheduling a task to run on fix intervals is quite simple.  Here is the code to create a scheduler   

We switched from java 1.8 to openjdk 16. And we were faced with builds running on jdk1.8 and jdk16 simultaneously for a short period. And the test didn’t run. So we had to pass arguments to surefire based on jdk the build was running. So we did it with a property whose value gets set … Read more

We upgraded from Java 1.8 to openjdk 16. And among many other issues that we have been struggling with for the past 3 weeks, we saw unusual behavior in tomcat. After deploying the webapp, we found that dates in the database were changed and logged GMT time instead of normal UTC time that is our … Read more

Load the property File Now get the Integer Value from the loaded property File

Recently we faced an issue while upgrading to the latest version 5.0.1 for poi. And we ended up having following jars for logging all logs to log4j log4j-slf4j-impl-2.14.0.jar jcl-over-slf4j-1.7.30.jar slf4j-api-1.7.30.jar log4j-api-2.14.0.jar log4j-core-2.14.0.jar log4j-web-2.14.0.jar We use hibernate in our web application. And hibernate needs slf4j for logging.  With our update the hibernate logs are no more … Read more