Geertjan Wielenga
60 viewsFrom OpenTelemetry to DuckDB
Observability platforms generally expect you to do your analysis inside them, using their query language and their dashboards. That works …
Geertjan Wielenga
98 articles
487,070 viewsGeertjan Wielenga
60 views
Geertjan Wielenga
165 viewsNetBeans DataWrangler: Query, Convert, and Edit Data Analytics Files
Apache NetBeans DataWrangler brings the file formats of data analytics into Apache NetBeans 31: CSV, Apache Parquet, JSON and Excel, the …
Geertjan Wielenga
1 viewsRunning DuckDB's JDBC Driver in a GraalVM Native Image
DuckDB is an in-process analytical database. You add one JAR to a Java project and get a SQL engine that reads CSV, Parquet, and JSON files …
Geertjan Wielenga
557 viewsDuckDB in Spring Batch: Replace In-Memory Java Loops with One SQL Statement
Spring Batch jobs usually follow the same pattern: an ItemReader streams rows, an ItemProcessor transforms each one, and an ItemWriter …
Geertjan Wielenga
545 viewsEmbedding DuckDB in a Maven App (and Using It for Things That Aren't Databases)
DuckDB is described as "SQLite for analytics," which is true: it's an in-process database engine that runs inside your application, with no …
776 viewsHow to Create a Spring Boot Fraud Scoring Service
Most Java teams who want a machine learning model in production end up standing up a Python service and calling it over HTTP. That works, …
Geertjan Wielenga
713 viewsToward a Durable Spring PetClinic
What makes a process a good candidate for durability? To answer this, we'll take the canonical Spring PetClinic and interrogate its sources.
Geertjan Wielenga
1,009 viewsTemporal Is to Your Code What a Database Is to Your Data
Your database made your data durable. Temporal does the same for your code.
Geertjan Wielenga
551 views"This Can't Possibly Work": What I Learned at a Temporal.io Workshop
When developers first hear about Temporal, they tend to move through a predictable sequence of emotions. First comes disbelief — the claim …
Geertjan Wielenga
525 viewsObserving Apache NetBeans with OpenTelemetry and Dash0
What happens when you point an observability agent at your IDE rather than your application?