Hi there, Apache Syncope provides a Netbeans plugin, in a Maven module (see the sources here [1]).
Up to Log4j 2.8.2 everything works fine; when instead we upgrade Log4j to 2.9.0, the following error is returned by Maven: [ERROR] Failed to execute goal org.codehaus.mojo:nbm-maven-plugin:4.1:manifest (default-manifest) on project syncope-ide-netbeans: Execution default-manifest of goal org.codehaus.mojo:nbm-maven-plugin:4.1:manifest failed.: IllegalArgumentException -> [Help 1] org.apache.maven.lifecycle.LifecycleExecutionException: Failed to execute goal org.codehaus.mojo:nbm-maven-plugin:4.1:manifest (default-manifest) on project syncope-ide-netbeans: Execution default-manifest of goal org.codehaus.mojo:nbm-maven-plugin:4.1:manifest failed. at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:213) at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:154) at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:146) at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject(LifecycleModuleBuilder.java:117) at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject(LifecycleModuleBuilder.java:81) at org.apache.maven.lifecycle.internal.builder.singlethreaded.SingleThreadedBuilder.build(SingleThreadedBuilder.java:51) at org.apache.maven.lifecycle.internal.LifecycleStarter.execute(LifecycleStarter.java:128) at org.apache.maven.DefaultMaven.doExecute(DefaultMaven.java:309) at org.apache.maven.DefaultMaven.doExecute(DefaultMaven.java:194) at org.apache.maven.DefaultMaven.execute(DefaultMaven.java:107) at org.apache.maven.cli.MavenCli.execute(MavenCli.java:993) at org.apache.maven.cli.MavenCli.doMain(MavenCli.java:345) at org.apache.maven.cli.MavenCli.main(MavenCli.java:191) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:498) at org.codehaus.plexus.classworlds.launcher.Launcher.launchEnhanced(Launcher.java:289) at org.codehaus.plexus.classworlds.launcher.Launcher.launch(Launcher.java:229) at org.codehaus.plexus.classworlds.launcher.Launcher.mainWithExitCode(Launcher.java:415) at org.codehaus.plexus.classworlds.launcher.Launcher.main(Launcher.java:356) Caused by: org.apache.maven.plugin.PluginExecutionException: Execution default-manifest of goal org.codehaus.mojo:nbm-maven-plugin:4.1:manifest failed. at org.apache.maven.plugin.DefaultBuildPluginManager.executeMojo(DefaultBuildPluginManager.java:145) at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:208) ... 20 more Caused by: java.lang.IllegalArgumentException at org.objectweb.asm.ClassReader.<init>(Unknown Source) at org.objectweb.asm.ClassReader.<init>(Unknown Source) at org.objectweb.asm.ClassReader.<init>(Unknown Source) at org.apache.maven.shared.dependency.analyzer.asm.DependencyClassFileVisitor.visitClass(DependencyClassFileVisitor.java:65) at org.apache.maven.shared.dependency.analyzer.ClassFileVisitorUtils.visitClass(ClassFileVisitorUtils.java:163) at org.apache.maven.shared.dependency.analyzer.ClassFileVisitorUtils.acceptJar(ClassFileVisitorUtils.java:107) at org.apache.maven.shared.dependency.analyzer.ClassFileVisitorUtils.accept(ClassFileVisitorUtils.java:61) at org.apache.maven.shared.dependency.analyzer.asm.ASMDependencyAnalyzer.analyze(ASMDependencyAnalyzer.java:50) at org.codehaus.mojo.nbm.NetBeansManifestUpdateMojo.buildDependencyClasses(NetBeansManifestUpdateMojo.java:920) at org.codehaus.mojo.nbm.NetBeansManifestUpdateMojo.buildProjectDependencyClasses(NetBeansManifestUpdateMojo.java:763) at org.codehaus.mojo.nbm.NetBeansManifestUpdateMojo.checkModuleClassPath(NetBeansManifestUpdateMojo.java:667) at org.codehaus.mojo.nbm.NetBeansManifestUpdateMojo.execute(NetBeansManifestUpdateMojo.java:530) at org.apache.maven.plugin.DefaultBuildPluginManager.executeMojo(DefaultBuildPluginManager.java:134) ... 21 more Any idea? TIA Regards. [1] https://github.com/apache/syncope/tree/2_0_X/ide/netbeans