During the compilation of a KieModule with dependencies the pom is parsed multiple times ---------------------------------------------------------------------------------------- Key: DROOLS-820 URL: https://issues.jboss.org/browse/DROOLS-820 Project: Drools Issue Type: Enhancement Reporter: Mario Fusco Assignee: Mario Fusco Priority: Critical When a KieModule has dependencies we have a big inefficiency because its pom is parsed multiple times. In particular the parsing happens: 1. When the KieBuilder creates the pom model: {code} java.lang.Thread.State: RUNNABLE at org.kie.scanner.embedder.MavenProjectLoader.parseMavenPom(MavenProjectLoader.java:39) at org.kie.scanner.embedder.MavenProjectLoader.parseMavenPom(MavenProjectLoader.java:35) at org.kie.scanner.MavenPomModelGenerator.parse(MavenPomModelGenerator.java:19) at org.drools.compiler.kproject.xml.PomModel$Parser.parse(PomModel.java:64) at org.drools.compiler.kie.builder.impl.KieBuilderImpl.buildPomModel(KieBuilderImpl.java:407) at org.drools.compiler.kie.builder.impl.KieBuilderImpl.init(KieBuilderImpl.java:116) at org.drools.compiler.kie.builder.impl.KieBuilderImpl.buildAll(KieBuilderImpl.java:149) at org.kie.scanner.AbstractKieCiTest.createKieJarWithDependencies(AbstractKieCiTest.java:47) at org.kie.scanner.KieRepositoryScannerTest.testKScannerWithDependencies(KieRepositoryScannerTest.java:104) {code} 2. In a for-loop once for each of the direct dependencies (this is particularly bad) {code} java.lang.Thread.State: RUNNABLE at org.kie.scanner.embedder.MavenProjectLoader.parseMavenPom(MavenProjectLoader.java:39) at org.kie.scanner.embedder.MavenProjectLoader.parseMavenPom(MavenProjectLoader.java:35) at org.kie.scanner.ArtifactResolver.getResolverFor(ArtifactResolver.java:112) at org.kie.scanner.KieRepositoryScannerImpl.loadArtifact(KieRepositoryScannerImpl.java:95) - locked <0x10b6> (a org.kie.scanner.KieRepositoryScannerImpl) at org.drools.compiler.kie.builder.impl.KieRepositoryImpl.loadKieModuleFromMavenRepo(KieRepositoryImpl.java:113) at org.drools.compiler.kie.builder.impl.KieRepositoryImpl.getKieModule(KieRepositoryImpl.java:99) at org.drools.compiler.kie.builder.impl.KieBuilderImpl.init(KieBuilderImpl.java:130) <-- IN A FOR-LOOP !!! at org.drools.compiler.kie.builder.impl.KieBuilderImpl.buildAll(KieBuilderImpl.java:149) at org.kie.scanner.AbstractKieCiTest.createKieJarWithDependencies(AbstractKieCiTest.java:47) at org.kie.scanner.KieRepositoryScannerTest.testKScannerWithDependencies(KieRepositoryScannerTest.java:104) {code} 3. When creating the ClassLoader for the KieProject {code} java.lang.Thread.State: RUNNABLE at org.kie.scanner.embedder.MavenProjectLoader.parseMavenPom(MavenProjectLoader.java:21) at org.kie.scanner.embedder.MavenProjectLoader.loadMavenProject(MavenProjectLoader.java:67) - locked <0x647> (a java.lang.Class) at org.kie.scanner.Aether.<init>(Aether.java:46) at org.kie.scanner.Aether.getAether(Aether.java:56) - locked <0x15d8> (a java.lang.Class) at org.kie.scanner.MavenRepository.getMavenRepository(MavenRepository.java:73) - locked <0x15d7> (a java.lang.Class) at org.kie.scanner.ArtifactResolver.getPomFileForGAV(ArtifactResolver.java:118) at org.kie.scanner.ArtifactResolver.getResolverFor(ArtifactResolver.java:84) at org.kie.scanner.MavenClassLoaderResolver.getClassLoader(MavenClassLoaderResolver.java:55) at org.drools.compiler.kie.builder.impl.KieModuleKieProject.<init>(KieModuleKieProject.java:53) at org.drools.compiler.kie.builder.impl.KieBuilderImpl.buildAll(KieBuilderImpl.java:171) at org.kie.scanner.AbstractKieCiTest.createKieJarWithDependencies(AbstractKieCiTest.java:47) {code} The main reason of this inefficiency is caused by the fact that the product of this pom parsing process are maven/aether classes that cannot be referenced in drools-compiler and then are recreated every time the compiler invokes kie-ci.