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…]
Recently we were working with apache poi. And we switched to openjdk16 from oracle java 1.8. On our test server we started seeing the following error: java.lang.UnsatisfiedLinkError: /openjdk/lib/libawt_xawt.so: libXtst.so.6: cannot open shared object file: So looking at the error we saw that ls -l /openjdk/lib/libawt_xawt.so was listing the file. So the file was there. And … [Read more…]
Problem : Eclipse :the input type of launch configuration does not exist Solution : I had created a Test class with a different file name than the name of the class itself. File Name : Test1.java And the contents were : class Test{ } On running this test in eclipse I … [Read more…]
