[main] WARN GenericApplicationContext:591 – Exception encountered during context initialization – cancelling refresh attempt: org.springframework.beans.factory.BeanCreationException: Error creating bean with name ‘sessionFactory’ defined in class path resource : Invocation of init method failed; nested exception is java.lang.NoClassDefFoundError: net/bytebuddy/TypeCache

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.    

GWT Module X not found in project sources or resources. -> [Help 1]

I get this error a lot of times while building my GWT project. I have a get module imported from a jar which is downloaded from artifactory. GWT Module com.model.MyCommonModel not found in project sources or resources. -> [Help 1] So I usually resolve it by deleting the jar locally or by running  mvn dependency:purge-local-repository … Read more

Creating a maintenance thread in Spring

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

Enums saved to database. How

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

Tomcat logs not showing correct time

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

No Logs generated for hibernate when using log4j, slf4j and jcl jars

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