Geertjan Wielenga

Table of Contents File supportQuery, convert, copyThe SQL editorConnections and extensionsDesignInstallationApache NetBeans DataWrangler brings the file formats of data analytics into Apache NetBeans 31: CSV, Apache Parquet, JSON and Excel, the formats exchanged with pandas, Spark, R, dbt, Power BI …

Table of Contents The Hello WorldWhat the Agent RecordedWhy It Failed BeforeA Larger ExampleWhere This Leaves the IssueDuckDB is an in-process analytical database. You add one JAR to a Java project and get a SQL engine that reads CSV, Parquet, …

Table of Contents The setupThe resultsWhy the differenceWhen to use itSpring Batch jobs usually follow the same pattern: an ItemReader streams rows, an ItemProcessor transforms each one, and an ItemWriter writes them out, chunk by chunk. A chunk-oriented step wires …

Table of Contents SetupQuerying a file on the internet with SQLQuerying a file on the internet with SQLWhere this is actually usefulSumming upDuckDB is described as “SQLite for analytics,” which is true: it’s an in-process database engine that runs inside …

Table of Contents Step 1 — Get the original example running1.1 Install Deep Netts into your local Maven repository1.2 Clone and run the example1.3 Understand what’s in the dataStep 2 — Make the split deterministicStep 3 — Train and export …

Table of Contents OverviewWhat makes a process a good candidate for durability?Spring PetClinic as an Exploratory DeviceStep 1 — Download the Spring PetClinic sourceStep 2 — Analyze the application for durability candidates2a — Analysis: processes that are good candidates for …

Table of Contents The pre-database era, replayedThe write-ahead log, but for your local variablesTransactions that span monthsThe same pattern, elsewhere in the stackWhat this means for your Java codeOnce upon a time, applications managed their own data files. Every program …

Table of Contents The problem: we all became distributed systems developersDurable execution: crash-proof, not crash-preventingHow it actually works: history replay, not snapshotsThe moving partsSeeing is believingWhy this changes how you write softwareWhen developers first hear about Temporal, they tend to …

Table of Contents The question nobody thinks to askWhy this is more than a curiosityThe setupWhat I started withStep 1: Download the agentStep 2: Edit netbeans.confStep 3: Start NetBeansWhat arrives in Dash0Logs: the IDE’s internal monologueSpans: every outbound HTTP callJVM …