108 posts
This tutorial walks you through creating a custom Apache NiFi Processor project and writing your own processor to handle FlowFiles. Source code: https://github.com/renfei/demo/tree/master/nifi/nifi-custom-bundle
I previously wrote "The Big Pitfall of Reading Files After Packaging a Spring Boot Project Into a Jar: ClassPathResource Fails to Read Files on the Classpath" and published it on my blog and CSDN. I hadn't logged into CSDN in a long while; today I did, and found two commenters both saying they tried my approach and couldn't get anything.
As the web has evolved, more sites are served over HTTPS. The discuz-ucenter-api-for-java library that connects Discuz's UCenter to Java runs into trouble over HTTPS: it's a very old project that hasn't been updated in ages and doesn't support HTTPS endpoints. So I updated it.
Newer DBeaver versions no longer support ODBC connections, probably because the JDBC-ODBC bridge was removed from Java 8. So the old tutorials telling you to use ODBC no longer work. Here's the correct way to connect DBeaver to DaMeng.
In SQL, the LIKE operator searches for a specified pattern in a column inside a WHERE clause. It's a very common way to query in practice, and most people only use the % wildcard — but several other patterns are supported too.
On January 5, 2021 GitHub's official blog published "Advancing developer freedom: GitHub is fully available in Iran". Iranian developers had previously been blocked because of US sanctions.
I connected my Spring Boot main site with a Discuz! forum so login and logout are synchronized, and member data from Discuz! can be shown back on my site. I also modified the previously open-sourced discuz-ucenter-api-for-java to fit the way Spring Boot is written today.
The last post covered Spring Boot back-end optimization and technology choices. This one is about front-end page performance optimization, mainly targeting the criteria Google publishes. Baidu's white paper isn't included.
The last post covered buying and configuring the server. This one is about Spring Boot optimization and technology choices: I switched to the more efficient FreeMarker, added Redis caching, added performance statistics, and added GitHub Actions workflows.
After upgrading to a newer Druid, the logs kept throwing errors: discard long time none received connection., jdbcUrl: blah blah. The program ran fine, but staring at a wall of errors is unbearable, so I went into their source to see what was actually going on.
