How to Unit Test Your Annotation Processor using jOOR

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Annotation processors can be useful as a hacky workaround to get some language feature into the Java language.
jOOQ also has an annotation processor that helps validate SQL syntax for:
Plain SQL usage (SQL injection risk)
SQL dialect support (prevent using an Oracle only feature on MySQL)
You can read about it more in detail here.
Unit testing annotation processors
Unit testing annotation processors is a bit more tricky than using them. Your processor hooks into the Java compiler and manipulates the compiled AST (or does other things). If you want to test your own processor, you need the test to run a Java compiler, but that is difficult to do in a normal project setup, especially if the expected behaviour for a given test is a compilation error.
Let’s assume we have the following two annotations:

@interface A {}
@interface B {}

And now, we would like to establish a rule that @A must always be accompanied by @B. For example:

// This must not compile
class Bad {}

// This is fine
@A @B
class Good {}

We’ll enforce that with an annotation processor:

class AProcessor implements Processor {
boolean processed;
private ProcessingEnvironment processingEnv;

public Set getSupportedOptions() {
return Collections.emptySet();

public Set getSupportedAnnotationTypes() {
return Collections.singleton(“*”);

public SourceVersion getSupportedSourceVersion() {
return SourceVersion.RELEASE_8;

public void init(ProcessingEnvironment processingEnv) {
this.processingEnv = processingEnv;

public boolean process(Set

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