This Building from source https://github.com/keycloak/keycloak/blob/master/docs/building.md states "Ensure you have JDK 8 (or newer), Maven 3.1.1 (or newer) and Git installed" suggesting build with jdk11 should work. starting with clean KC v7 source, git checkout 7.0.0 git log | head commit e6a274ea0e31c6572e795f3372f006c88122539b Author: Stian Thorgersen <stianst(a)gmail.com&gt; Date: Fri Aug 23 14:07:35 2019 +0200 Update release.sh commit 7bf81b0458fcf39143b3cbef59963daf093079fb Author: Stian Thorgersen <stianst(a)gmail.com&gt; Date: Fri Aug 23 14:01:03 2019 +0200 Building with each JDK, both v8 & v11 (1) BUILD WITH JDK8 java -version openjdk version "1.8.0_222" OpenJDK Runtime Environment (IcedTea 3.13.0) (build 1.8.0_222-b10 suse-lp151.333.1-x86_64) OpenJDK 64-Bit Server VM (build 25.222-b10, mixed mode) mvn -version Apache Maven 3.6.1 (d66c9c0b3152b2e69ee9bac180bb8fcc8e6af555; 2019-04-04T12:00:29-07:00) Maven home: /usr/share/java/maven Java version: 1.8.0_222, vendor: IcedTea, runtime: /usr/lib64/jvm/java-1.8.0-openjdk-1.8.0/jre Default locale: en_US, platform encoding: UTF-8 OS name: "linux", version: "5.2.13-24.gacd8e88-default", arch: "amd64", family: "unix" mvn \ --errors \ --update-snapshots \ --activate-profiles distribution \ --projects distribution/server-dist,distribution/adapters/wildfly-adapter \ --also-make \ -Dmaven.test.skip=true \ clean \ install ==> SUCCEEDS ... [INFO] ------------------------------------------------------------------------ [INFO] BUILD SUCCESS [INFO] ------------------------------------------------------------------------ [INFO] Total time: 01:56 min [INFO] Finished at: 2019-09-08T12:05:22-07:00 [INFO] ------------------------------------------------------------------------ & the build *execs* OK under BOTH jre v8 & v11 runtimes. (2) BUILD WITH JDK11 java -version openjdk version "11.0.4" 2019-07-16 OpenJDK Runtime Environment (build 11.0.4+11-suse-lp151.131.1-x8664) OpenJDK 64-Bit Server VM (build 11.0.4+11-suse-lp151.131.1-x8664, mixed mode) mvn -version Apache Maven 3.6.1 (d66c9c0b3152b2e69ee9bac180bb8fcc8e6af555; 2019-04-04T12:00:29-07:00) Maven home: /usr/share/java/maven Java version: 11.0.4, vendor: Oracle Corporation, runtime: /usr/lib64/jvm/java-11-openjdk-11 Default locale: en_US, platform encoding: UTF-8 OS name: "linux", version: "5.2.13-24.gacd8e88-default", arch: "amd64", family: "unix" mvn -X \ --errors \ --update-snapshots \ --activate-profiles distribution \ --projects distribution/server-dist,distribution/adapters/wildfly-adapter \ --also-make \ -Dmaven.test.skip=true \ clean \ install ==> FAILs ... [INFO] 50 warnings [INFO] ------------------------------------------------------------- [INFO] ------------------------------------------------------------- [ERROR] COMPILATION ERROR : [INFO] ------------------------------------------------------------- [ERROR] /home/dev/keycloak/saml-core/src/main/java/org/keycloak/saml/processing/api/util/KeyInfoTools.java:[51,70] incompatible types: java.util.List<javax.xml.crypto.XMLStructure> cannot be converted to java.lang.Iterable<java.lang.Object> [ERROR] /home/dev/keycloak/saml-core/src/main/java/org/keycloak/saml/processing/api/util/KeyInfoTools.java:[55,70] incompatible types: java.util.List<javax.xml.crypto.XMLStructure> cannot be converted to java.lang.Iterable<java.lang.Object> [ERROR] /home/dev/keycloak/saml-core/src/main/java/org/keycloak/saml/processing/api/util/KeyInfoTools.java:[60,58] incompatible types: java.util.List<capture#1 of ?> cannot be converted to java.lang.Iterable<java.lang.Object> [ERROR] /home/dev/keycloak/saml-core/src/main/java/org/keycloak/saml/processing/core/util/XMLSignatureUtil.java:[757,42] incompatible types: java.util.List<java.lang.Object> cannot be converted to java.util.List<? extends javax.xml.crypto.XMLStructure> [INFO] 4 errors [INFO] ------------------------------------------------------------- [INFO] ------------------------------------------------------------------------ [INFO] Reactor Summary for Keycloak 7.0.0: [INFO] [INFO] Keycloak ........................................... SUCCESS [ 1.321 s] [INFO] Keycloak Common .................................... SUCCESS [ 4.921 s] [INFO] Keycloak Core ...................................... SUCCESS [ 2.599 s] [INFO] Keycloak Server SPI ................................ SUCCESS [ 1.960 s] [INFO] Keycloak Server Private SPI ........................ SUCCESS [ 3.378 s] [INFO] Keycloak Kerberos Federation ....................... SUCCESS [ 0.567 s] [INFO] Keycloak LDAP UserStoreProvider .................... SUCCESS [ 1.368 s] [INFO] Keycloak SAML Core Public API ...................... SUCCESS [ 1.267 s] [INFO] Keycloak SAML Core ................................. FAILURE [ 1.537 s] [INFO] Keycloak REST Services ............................. SKIPPED [INFO] Keycloak JS Integration ............................ SKIPPED [INFO] Keycloak Themes .................................... SKIPPED [INFO] Keycloak Model Parent .............................. SKIPPED [INFO] Keycloak Model JPA ................................. SKIPPED [INFO] Keycloak Model Infinispan .......................... SKIPPED [INFO] Keycloak SSSD Federation ........................... SKIPPED [INFO] KeyCloak Authz: Parent ............................. SKIPPED [INFO] KeyCloak AuthZ: Provider Parent .................... SKIPPED [INFO] KeyCloak AuthZ: Common Policy Providers ............ SKIPPED [INFO] KeyCloak AuthZ: Drools Policy Provider ............. SKIPPED [INFO] Keycloak WildFly Integration ....................... SKIPPED [INFO] Keycloak WildFly Add User Script ................... SKIPPED [INFO] Keycloak WildFly Extensions ........................ SKIPPED [INFO] Keycloak WildFly Server Subsystem .................. SKIPPED [INFO] Keycloak Integration ............................... SKIPPED [INFO] Keycloak Client CLI ................................ SKIPPED [INFO] Keycloak Client Registration CLI ................... SKIPPED [INFO] Keycloak Admin CLI ................................. SKIPPED [INFO] Keycloak Client CLI Distribution ................... SKIPPED [INFO] Keycloak Adapter SPI ............................... SKIPPED [INFO] Keycloak Undertow Integration SPI .................. SKIPPED [INFO] Common JBoss/Wildfly Core Classes .................. SKIPPED [INFO] KeyCloak Authz: Client API ......................... SKIPPED [INFO] Keycloak Adapter Core .............................. SKIPPED [INFO] Keycloak Undertow Integration ...................... SKIPPED [INFO] Keycloak Servlet OAuth Client ...................... SKIPPED [INFO] Keycloak Wildfly Integration ....................... SKIPPED [INFO] Keycloak Wildfly Elytron OIDC Adapter .............. SKIPPED [INFO] Keycloak Wildfly Adapter Subsystem ................. SKIPPED [INFO] Distribution Parent ................................ SKIPPED [INFO] Keycloak Distribution Licenses Common .............. SKIPPED [INFO] Keycloak Distribution Maven Plugins Parent ......... SKIPPED [INFO] Keycloak Licenses Processor Maven Plugin ........... SKIPPED [INFO] Feature Pack Builds ................................ SKIPPED [INFO] Keycloak Feature Pack: Adapter ..................... SKIPPED [INFO] Adapters Distribution Parent ....................... SKIPPED [INFO] Keycloak Adapter Overlay Distribution .............. SKIPPED [INFO] Keycloak Feature Pack: Server ...................... SKIPPED [INFO] Keycloak Server Distribution ....................... SKIPPED [INFO] ------------------------------------------------------------------------ [INFO] BUILD FAILURE [INFO] ------------------------------------------------------------------------ [INFO] Total time: 24.322 s [INFO] Finished at: 2019-09-08T12:10:17-07:00 [INFO] ------------------------------------------------------------------------ [ERROR] Failed to execute goal org.apache.maven.plugins:maven-compiler-plugin:3.8.0-jboss-2:compile (default-compile) on project keycloak-saml-core: Compilation failure: Compilation failure: [ERROR] /home/dev/keycloak/saml-core/src/main/java/org/keycloak/saml/processing/api/util/KeyInfoTools.java:[51,70] incompatible types: java.util.List<javax.xml.crypto.XMLStructure> cannot be converted to java.lang.Iterable<java.lang.Object> [ERROR] /home/dev/keycloak/saml-core/src/main/java/org/keycloak/saml/processing/api/util/KeyInfoTools.java:[55,70] incompatible types: java.util.List<javax.xml.crypto.XMLStructure> cannot be converted to java.lang.Iterable<java.lang.Object> [ERROR] /home/dev/keycloak/saml-core/src/main/java/org/keycloak/saml/processing/api/util/KeyInfoTools.java:[60,58] incompatible types: java.util.List<capture#1 of ?> cannot be converted to java.lang.Iterable<java.lang.Object> [ERROR] /home/dev/keycloak/saml-core/src/main/java/org/keycloak/saml/processing/core/util/XMLSignatureUtil.java:[757,42] incompatible types: java.util.List<java.lang.Object> cannot be converted to java.util.List<? extends javax.xml.crypto.XMLStructure> [ERROR] -> [Help 1] org.apache.maven.lifecycle.LifecycleExecutionException: Failed to execute goal org.apache.maven.plugins:maven-compiler-plugin:3.8.0-jboss-2:compile (default-compile) on project keycloak-saml-core: Compilation failure at org.apache.maven.lifecycle.internal.MojoExecutor.execute (MojoExecutor.java:215) at org.apache.maven.lifecycle.internal.MojoExecutor.execute (MojoExecutor.java:156) at org.apache.maven.lifecycle.internal.MojoExecutor.execute (MojoExecutor.java:148) 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:56) at org.apache.maven.lifecycle.internal.LifecycleStarter.execute (LifecycleStarter.java:128) at org.apache.maven.DefaultMaven.doExecute (DefaultMaven.java:305) at org.apache.maven.DefaultMaven.doExecute (DefaultMaven.java:192) at org.apache.maven.DefaultMaven.execute (DefaultMaven.java:105) at org.apache.maven.cli.MavenCli.execute (MavenCli.java:956) at org.apache.maven.cli.MavenCli.doMain (MavenCli.java:288) at org.apache.maven.cli.MavenCli.main (MavenCli.java:192) at jdk.internal.reflect.NativeMethodAccessorImpl.invoke0 (Native Method) at jdk.internal.reflect.NativeMethodAccessorImpl.invoke (NativeMethodAccessorImpl.java:62) at jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke (DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke (Method.java:566) at org.codehaus.plexus.classworlds.launcher.Launcher.launchEnhanced (Launcher.java:282) at org.codehaus.plexus.classworlds.launcher.Launcher.launch (Launcher.java:225) at org.codehaus.plexus.classworlds.launcher.Launcher.mainWithExitCode (Launcher.java:406) at org.codehaus.plexus.classworlds.launcher.Launcher.main (Launcher.java:347) Caused by: org.apache.maven.plugin.compiler.CompilationFailureException: Compilation failure at org.apache.maven.plugin.compiler.AbstractCompilerMojo.execute (AbstractCompilerMojo.java:1215) at org.apache.maven.plugin.compiler.CompilerMojo.execute (CompilerMojo.java:196) at org.apache.maven.plugin.DefaultBuildPluginManager.executeMojo (DefaultBuildPluginManager.java:137) at org.apache.maven.lifecycle.internal.MojoExecutor.execute (MojoExecutor.java:210) at org.apache.maven.lifecycle.internal.MojoExecutor.execute (MojoExecutor.java:156) at org.apache.maven.lifecycle.internal.MojoExecutor.execute (MojoExecutor.java:148) 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:56) at org.apache.maven.lifecycle.internal.LifecycleStarter.execute (LifecycleStarter.java:128) at org.apache.maven.DefaultMaven.doExecute (DefaultMaven.java:305) at org.apache.maven.DefaultMaven.doExecute (DefaultMaven.java:192) at org.apache.maven.DefaultMaven.execute (DefaultMaven.java:105) at org.apache.maven.cli.MavenCli.execute (MavenCli.java:956) at org.apache.maven.cli.MavenCli.doMain (MavenCli.java:288) at org.apache.maven.cli.MavenCli.main (MavenCli.java:192) at jdk.internal.reflect.NativeMethodAccessorImpl.invoke0 (Native Method) at jdk.internal.reflect.NativeMethodAccessorImpl.invoke (NativeMethodAccessorImpl.java:62) at jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke (DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke (Method.java:566) at org.codehaus.plexus.classworlds.launcher.Launcher.launchEnhanced (Launcher.java:282) at org.codehaus.plexus.classworlds.launcher.Launcher.launch (Launcher.java:225) at org.codehaus.plexus.classworlds.launcher.Launcher.mainWithExitCode (Launcher.java:406) at org.codehaus.plexus.classworlds.launcher.Launcher.main (Launcher.java:347) [ERROR] [ERROR] [ERROR] For more information about the errors and possible solutions, please read the following articles: [ERROR] [Help 1] http://cwiki.apache.org/confluence/display/MAVEN/MojoFailureException [ERROR] [ERROR] After correcting the problems, you can resume the build with the command [ERROR] mvn <goals> -rf :keycloak-saml-core Is Keycloak known/intended to be JDK11 build-ready? or just @runtime? _______________________________________________ keycloak-dev mailing list keycloak-dev(a)lists.jboss.org https://lists.jboss.org/mailman/listinfo/keycloak-dev