In some cases, it's really useful to be able to compile a class at runtime using the java.compiler module. You can e.g. load a Java source file from the database, compile it on the fly, and execute its code as if it were part of your application. In the upcoming jOOR 0.9.8, this will be … Continue reading How to Compile a Class at Runtime with Java 8 and 9
Category: java 9
Correct Reflective Access to Interface Default Methods in Java 8, 9, 10
When performing reflective access to default methods in Java, Google seems to fail us. The solutions presented on Stack Overflow, for instance, seem to work only in a certain set of cases, and not on all Java versions. This article will illustrate different approaches to calling interface default methods through reflection, as may be required … Continue reading Correct Reflective Access to Interface Default Methods in Java 8, 9, 10
Map Reducing a Set of Values Into a Dynamic SQL UNION Query
Sounds fancy, right? But it's a really nice and reasonable approach to doing dynamic SQL with jOOQ. This blog post is inspired by a Stack Overflow question, where a user wanted to turn a set of values into a dynamic UNION query like this: SELECT T.COL1 FROM T WHERE T.COL2 = 'V1' UNION SELECT T.COL1 … Continue reading Map Reducing a Set of Values Into a Dynamic SQL UNION Query
jOOQ Tuesdays: Nicolai Parlog Talks About Java 9
Welcome to the jOOQ Tuesdays series. In this series, we’ll publish an article on the third Tuesday every other month where we interview someone we find exciting in our industry from a jOOQ perspective. This includes people who work with SQL, Java, Open Source, and a variety of other related topics. I'm very excited to … Continue reading jOOQ Tuesdays: Nicolai Parlog Talks About Java 9
Benchmarking JDK String.replace() vs Apache Commons StringUtils.replace()
What's better? Using the JDK's String.replace() or something like Apache Commons Lang's Apache Commons Lang's StringUtils.replace()? In this article, I'll compare the two, first in a profiling session using Java Mission Control (JMC), then in a benchmark using JMH, and we'll see that Java 9 heavily improved things in this area. Profiling using JMC In … Continue reading Benchmarking JDK String.replace() vs Apache Commons StringUtils.replace()
Watch Out For Recursion in Java 8’s [Primitive]Stream.iterate()
An interesting question by Tagir Valeev on Stack Overflow has recently caught my attention. To keep things short (read the question for details), while the following code works: public static Stream<Long> longs() { return Stream.iterate(1L, i -> 1L + longs().skip(i - 1L) .findFirst() .get()); } longs().limit(5).forEach(System.out::println); printing 1 2 3 4 5 The following, similar … Continue reading Watch Out For Recursion in Java 8’s [Primitive]Stream.iterate()
How to Support Java 6, 8, 9 in a Single API
With jOOQ 3.7, we have finally added formal support for Java 8 features. This opened the door to a lot of nice improvements, such as: Creating result streams try (Stream<Record2<String, String>> stream = DSL.using(configuration) .select(FIRST_NAME, LAST_NAME) .from(PERSON) .stream()) { List<String> people = stream.map(p -> p.value1() + " " + p.value2()) .collect(Collectors.toList()); } Calling statements asynchronously … Continue reading How to Support Java 6, 8, 9 in a Single API
JEP 277 “Enhanced Deprecation” is Nice. But Here’s a Much Better Alternative
Maintaining APIs is hard. We're maintaining the jOOQ API which is extremely complex. But we are following relatively relaxed rules as far as semantic versioning is concerned. When you read comments by Brian Goetz and others about maintaining backwards-compatibility in the JDK, I can but show a lot of respect for their work. Obviously, we … Continue reading JEP 277 “Enhanced Deprecation” is Nice. But Here’s a Much Better Alternative
What the sun.misc.Unsafe Misery Teaches Us
Oracle will remove the internal sun.misc.Unsafe class in Java 9. While most people are probably rather indifferent regarding this change, some other people - mostly library developers - are not. There had been a couple of recent articles in the blogosphere painting a dark picture of what this change will imply: Dripstat's Removal of sun.misc.Unsafe … Continue reading What the sun.misc.Unsafe Misery Teaches Us