Category Archives: Programming

Setup #Eclipse as #go IDE in Linux

I like Eclipse and I used it for many years on Linux for Java developement. I wanted to test how go(golang) works but I did not like all the suggested IDEs, you know the “cool” ones. I wanted to be able to use Eclipse. By default eclipse is not go oriented but with some small… Read More »


Debug tools for enterprise environments

There are various tools that I use to spot issues and investigate an enterprise environment. One of my favourite tools is IBM Performance Analysis Suite. Capabilities described by IBM: Import all kinds of performance data for analysis. Some examples: DB2 snapshot, Java verbose GC output, Java thread dumps. Import software/middle-ware configuration for compliance checking. Some… Read More »

Hibernate: Optimize updates with @DynamicUpdate

When using Hibernate as a layer between your Java code and the Database layer you release control on how the actual SQL query is generated. Hibernate will generate from the HSQL you write the “best” query. That “best” is in fact sometimes sub-optimal. A very important Hibernate 4 (make sure you have at least 4.2.5)… Read More »

Hibernate: Avoiding a “fake” exception: javax.persistence.TransactionRequiredException: Executing an update/delete query

I encountered some weird issue caused by the way Hibernate works. The exception messages returned by Hibernate are confusing as they are just a side-effect of the real issue. The code in question was something like that: In a manager bean we have the following: @Stateless(name = “ObjectManagerBean”, mappedName = “ObjectManagerBean/remote”) public class ObjectManagerBean …… Read More »

DB2: SQL Error: -803, SQLState: 23505, Unique Constraint Violation

Yet another thread of DB2 errors from an EJB application that connects to a DB2 instance. The reported thread of errors: [7/13/16 12:46:38:669 IST] 00000098 SqlExceptionH Z org.hibernate.engine.jdbc.spi.SqlExceptionHelper logExceptions SQL Error: -4229, SQLState: null [7/13/16 12:46:38:670 IST] 00000098 SqlExceptionH Z org.hibernate.engine.jdbc.spi.SqlExceptionHelper logExceptions [jcc][t4][102][10040][4.19.26] Batch failure. The batch was submitted, but at least one exception occurred… Read More »

DB2: SQL Error: -803, SQLState: 23505 due to NON-UTF8 character in parameter

Sometimes Java and databases do not use the same standards to represent data. This can lead to strange exceptions for which sometimes can be hard to pin point the cause. We have the following Exception reported in the enterprise application log. Let’s analyse the errors. [7/13/16 12:46:32:752 IST] 00001456 SqlExceptionH Z org.hibernate.engine.jdbc.spi.SqlExceptionHelper logExceptions SQL Error:… Read More »

CVS: Add a missing tag by date for a CVS project release

Sometimes you discover that you forgot to tag on CVS a test release that made it on the production system. The issue starts when you discovered that in the mean time you or someone else already added new functionality on the development branch. In the following I will create a tag only based on the… Read More »