maven - Java Annotation processor for remote JAR -

general question

i have 2 projects , b; b has dependency on a. want generate code in b annotation processor, based on annotations on objects in a. when run compilation correct processor implementation, annotated objects b picked up.

i understand scanning other jars must disabled default, because don't want annotation scan dependencies. understand may impossible want because of compiler magic - don't know lot - i'm hoping it's not.

specific case

my projects called db , web. web depends on db jpa access; configured in maven. due number of architectural choices, db must remain separate jar. db doesn't use spring except annotations consumed web; web uses spring mvc.

i'm trying generate crudrepository interfaces jpa entities annotation processor. @repository objects supposed go in repo package in web project, can used @autowired wherever in web application. annotation i'm performing scan @javax.persistence.entity, i've tried custom annotation, same results.

@supportedannotationtypes("javax.persistence.entity") @supportedsourceversion(sourceversion.release_8) public class repositoryfactory extends abstractprocessor {      @override     public boolean process(set<? extends typeelement> annotations, roundenvironment roundenv) {         (element e : roundenv.getelementsannotatedwith(entity.class)) {             if (e.getkind() != elementkind.class) {                 continue;             }             // todo: implement logic skip manually implemented repos             try {                 string name = e.getsimplename().tostring();                 typeelement clazz = (typeelement) e;                  javafileobject f = processingenv.getfiler().                         createsourcefile("blagae.web.repo." + name + "repo");                 try (writer w = f.openwriter()) {                     printwriter pw = new printwriter(w);                     pw.println("package blagae.web.repo;");                     pw.println("import org.springframework.data.repository.crudrepository;");                     pw.printf("import %s;\n", clazz.tostring());                     pw.println("import org.springframework.stereotype.repository;");                     pw.println("@repository");                     pw.printf("public interface %srepo extends crudrepository<%s, long> {}\n", name, name);                     pw.flush();                 }             } catch (ioexception ex) {                 logger.getlogger(repositoryfactory.class.getname()).log(level.severe, null, ex);             }         }         return false;     } } 

ideally, i'd love tell me annotation simple as

@componentscan(basepackages = "blagae.db.*") 

but of course, i'm not counting on because documented somewhere. workaround, add spring dependency db , generate classes there, serve purpose in spring mvc app. i'm wary of config might take make work.

update

some info: i'm using maven-processor-plugin, i've verified work in web project classes defined there. however, want access classes annotated in dependency project db. have looked method abstractprocessor::getsupportedoptions it's unclear me there.

maven config:

<plugin>     <groupid>org.bsc.maven</groupid>     <artifactid>maven-processor-plugin</artifactid>     <version>2.2.4</version>     <configuration>         <processors>             <processor>blagae.utils.repositoryfactory</processor>         </processors>     </configuration>     <executions>         <execution>             <id>process</id>             <goals>                 <goal>process</goal>             </goals>             <phase>generate-sources</phase>         </execution>     </executions> </plugin> 

suggestion

another random thought had run javacompiler process db project in web, how inject processor ?

annotation processor works on compilation phase of project (web in case) , compiler compiles project. dependencies of current project compiled , compiler (and result annotation processor) don't touch (or have no access) third party libraries (db).

you can try extract annotation processor separate project/jar , use in web , db projects. in case annotation processor create crudrepository on compilation phase of concrete project. , generated classes in db project available in web.