Hello, We are trying to migrate our application from wildfly 9.0 to 30.0.final version and here I did below all relevant changes and facing some issue while deployment . 1. all changes related to javax.servlet to jakarta servlet changes 2. all changes related to ejb and corba package Here in one of our application communicate to solr using "org.carrot2 " library version 3.12.0 version and on start up we trying to load all its config using servlet context listner. while loading all configuration we getting below error: 12:32:14,943 ERROR [org.carrot2.webapp.model.WebappConfig] (ServerService Thread Pool -- 86) Could not load application config.: java.lang.RuntimeException: Descriptor not available. at deployment.APP.war//org.carrot2.core.ProcessingComponentDescriptor.getBindableDescriptor(ProcessingComponentDescriptor.java:253) at deployment.APP.war//org.carrot2.webapp.model.WebappConfig.prepareSourceAttributeMetadata(WebappConfig.java:229) at deployment.APP.war//org.carrot2.webapp.model.WebappConfig.getSingleton(WebappConfig.java:165) at deployment.APP.war//com.package.search.listeners.ApplicationStartupListener.contextInitialized(ApplicationStartupListener.java:49) at io.undertow.servlet@2.3.10.Final//io.undertow.servlet.core.ApplicationListeners.contextInitialized(ApplicationListeners.java:187) at io.undertow.servlet@2.3.10.Final//io.undertow.servlet.core.DeploymentManagerImpl$1.call(DeploymentManagerImpl.java:219) at io.undertow.servlet@2.3.10.Final//io.undertow.servlet.core.DeploymentManagerImpl$1.call(DeploymentManagerImpl.java:187) at io.undertow.servlet@2.3.10.Final//io.undertow.servlet.core.ServletRequestContextThreadSetupAction$1.call(ServletRequestContextThreadSetupAction.java:42) at io.undertow.servlet@2.3.10.Final//io.undertow.servlet.core.ContextClassLoaderSetupAction$1.call(ContextClassLoaderSetupAction.java:43) at org.wildfly.extension.undertow@30.0.1.Final//org.wildfly.extension.undertow.deployment.UndertowDeploymentInfoService$UndertowThreadSetupAction.lambda$create$0(UndertowDeploymentInfoService.java:1413) at org.wildfly.extension.undertow@30.0.1.Final//org.wildfly.extension.undertow.deployment.UndertowDeploymentInfoService$UndertowThreadSetupAction.lambda$create$0(UndertowDeploymentInfoService.java:1413) at org.wildfly.extension.undertow@30.0.1.Final//org.wildfly.extension.undertow.deployment.UndertowDeploymentInfoService$UndertowThreadSetupAction.lambda$create$0(UndertowDeploymentInfoService.java:1413) at org.wildfly.extension.undertow@30.0.1.Final//org.wildfly.extension.undertow.deployment.UndertowDeploymentInfoService$UndertowThreadSetupAction.lambda$create$0(UndertowDeploymentInfoService.java:1413) at io.undertow.servlet@2.3.10.Final//io.undertow.servlet.core.DeploymentManagerImpl.deploy(DeploymentManagerImpl.java:255) at org.wildfly.extension.undertow@30.0.1.Final//org.wildfly.extension.undertow.deployment.UndertowDeploymentService.startContext(UndertowDeploymentService.java:88) at org.wildfly.extension.undertow@30.0.1.Final//org.wildfly.extension.undertow.deployment.UndertowDeploymentService$1.run(UndertowDeploymentService.java:70) at java.base/java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:572) at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:317) at org.jboss.threads@2.4.0.Final//org.jboss.threads.ContextClassLoaderSavingRunnable.run(ContextClassLoaderSavingRunnable.java:35) at org.jboss.threads@2.4.0.Final//org.jboss.threads.EnhancedQueueExecutor.safeRun(EnhancedQueueExecutor.java:1990) at org.jboss.threads@2.4.0.Final//org.jboss.threads.EnhancedQueueExecutor$ThreadBody.doRunTask(EnhancedQueueExecutor.java:1486) at org.jboss.threads@2.4.0.Final//org.jboss.threads.EnhancedQueueExecutor$ThreadBody.run(EnhancedQueueExecutor.java:1377) at java.base/java.lang.Thread.run(Thread.java:1583) at org.jboss.threads@2.4.0.Final//org.jboss.threads.JBossThread.run(JBossThread.java:513) Caused by: java.lang.NoClassDefFoundError: Descriptor class not found: org.carrot2.source.solr.SolrDocumentSourceModelIssueDescriptor at deployment.APP.war//org.carrot2.util.attribute.BindableDescriptorUtils.getDescriptorClass(BindableDescriptorUtils.java:80) at deployment.APP.war//org.carrot2.util.attribute.BindableDescriptorUtils.getDescriptor(BindableDescriptorUtils.java:96) at deployment.APP.war//org.carrot2.util.attribute.BindableMetadata.forClassWithParents(BindableMetadata.java:62) at deployment.APP.war//org.carrot2.util.attribute.BindableDescriptorBuilder.buildDescriptor(BindableDescriptorBuilder.java:69) at deployment.APP.war//org.carrot2.util.attribute.BindableDescriptorBuilder.buildDescriptor(BindableDescriptorBuilder.java:47) at deployment.APP.war//org.carrot2.core.ProcessingComponentDescriptor.onCommit(ProcessingComponentDescriptor.java:326) at java.base/jdk.internal.reflect.DirectMethodHandleAccessor.invoke(DirectMethodHandleAccessor.java:103) at java.base/java.lang.reflect.Method.invoke(Method.java:580) at deployment.APP.war//org.simpleframework.xml.core.Function.call(Function.java:84) at deployment.APP.war//org.simpleframework.xml.core.Caller.commit(Caller.java:141) at deployment.APP.war//org.simpleframework.xml.core.Composite.read(Composite.java:204) at deployment.APP.war//org.simpleframework.xml.core.Composite.read(Composite.java:148) at deployment.APP.war//org.simpleframework.xml.core.Traverser.read(Traverser.java:92) at deployment.APP.war//org.simpleframework.xml.core.CompositeList.populate(CompositeList.java:175) at deployment.APP.war//org.simpleframework.xml.core.CompositeList.read(CompositeList.java:120) at deployment.APP.war//org.simpleframework.xml.core.Composite.readVariable(Composite.java:623) at deployment.APP.war//org.simpleframework.xml.core.Composite.readInstance(Composite.java:573) at deployment.APP.war//org.simpleframework.xml.core.Composite.readUnion(Composite.java:549) at deployment.APP.war//org.simpleframework.xml.core.Composite.readElement(Composite.java:532) at deployment.APP.war//org.simpleframework.xml.core.Composite.readElements(Composite.java:445) at deployment.APP.war//org.simpleframework.xml.core.Composite.access$400(Composite.java:59) at deployment.APP.war//org.simpleframework.xml.core.Composite$Builder.read(Composite.java:1383) at deployment.APP.war//org.simpleframework.xml.core.Composite.read(Composite.java:201) at deployment.APP.war//org.simpleframework.xml.core.Composite.read(Composite.java:148) at deployment.APP.war//org.simpleframework.xml.core.Traverser.read(Traverser.java:92) at deployment.APP.war//org.simpleframework.xml.core.Persister.read(Persister.java:625) at deployment.APP.war//org.simpleframework.xml.core.Persister.read(Persister.java:606) at deployment.APP.war//org.simpleframework.xml.core.Persister.read(Persister.java:584) at deployment.APP.war//org.simpleframework.xml.core.Persister.read(Persister.java:543) at deployment.APP.war//org.simpleframework.xml.core.Persister.read(Persister.java:444) at deployment.APP.war//org.carrot2.core.ProcessingComponentSuite.deserialize(ProcessingComponentSuite.java:163) at deployment.APP.war//org.carrot2.core.ProcessingComponentSuite.postDeserialize(ProcessingComponentSuite.java:126) at java.base/jdk.internal.reflect.DirectMethodHandleAccessor.invoke(DirectMethodHandleAccessor.java:103) at java.base/java.lang.reflect.Method.invoke(Method.java:580) at deployment.APP.war//org.simpleframework.xml.core.Function.call(Function.java:84) at deployment.APP.war//org.simpleframework.xml.core.Caller.commit(Caller.java:141) at deployment.APP.war//org.simpleframework.xml.core.Composite.read(Composite.java:204) at deployment.APP.war//org.simpleframework.xml.core.Composite.read(Composite.java:148) at deployment.APP.war//org.simpleframework.xml.core.Traverser.read(Traverser.java:92) at deployment.APP.war//org.simpleframework.xml.core.Persister.read(Persister.java:625) at deployment.APP.war//org.simpleframework.xml.core.Persister.read(Persister.java:606) at deployment.APP.war//org.simpleframework.xml.core.Persister.read(Persister.java:584) at deployment.APP.war//org.simpleframework.xml.core.Persister.read(Persister.java:543) at deployment.APP.war//org.simpleframework.xml.core.Persister.read(Persister.java:444) at deployment.APP.war//org.carrot2.core.ProcessingComponentSuite.deserialize(ProcessingComponentSuite.java:163) at deployment.APP.war//org.carrot2.webapp.model.WebappConfig.getSingleton(WebappConfig.java:159) ... 21 more 12:32:14,956 ERROR [com.package.search.listeners.ApplicationStartupListener] (ServerService Thread Pool -- 86) An exception occured in ApplicationStartupListener::contextInitialized(): java.lang.RuntimeException: Could not load application config. at deployment.APP.war//org.carrot2.webapp.model.WebappConfig.getSingleton(WebappConfig.java:174) at deployment.APP.war//com.package.search.listeners.ApplicationStartupListener.contextInitialized(ApplicationStartupListener.java:49) at io.undertow.servlet@2.3.10.Final//io.undertow.servlet.core.ApplicationListeners.contextInitialized(ApplicationListeners.java:187) at io.undertow.servlet@2.3.10.Final//io.undertow.servlet.core.DeploymentManagerImpl$1.call(DeploymentManagerImpl.java:219) at io.undertow.servlet@2.3.10.Final//io.undertow.servlet.core.DeploymentManagerImpl$1.call(DeploymentManagerImpl.java:187) at io.undertow.servlet@2.3.10.Final//io.undertow.servlet.core.ServletRequestContextThreadSetupAction$1.call(ServletRequestContextThreadSetupAction.java:42) at io.undertow.servlet@2.3.10.Final//io.undertow.servlet.core.ContextClassLoaderSetupAction$1.call(ContextClassLoaderSetupAction.java:43) at org.wildfly.extension.undertow@30.0.1.Final//org.wildfly.extension.undertow.deployment.UndertowDeploymentInfoService$UndertowThreadSetupAction.lambda$create$0(UndertowDeploymentInfoService.java:1413) at org.wildfly.extension.undertow@30.0.1.Final//org.wildfly.extension.undertow.deployment.UndertowDeploymentInfoService$UndertowThreadSetupAction.lambda$create$0(UndertowDeploymentInfoService.java:1413) at org.wildfly.extension.undertow@30.0.1.Final//org.wildfly.extension.undertow.deployment.UndertowDeploymentInfoService$UndertowThreadSetupAction.lambda$create$0(UndertowDeploymentInfoService.java:1413) at org.wildfly.extension.undertow@30.0.1.Final//org.wildfly.extension.undertow.deployment.UndertowDeploymentInfoService$UndertowThreadSetupAction.lambda$create$0(UndertowDeploymentInfoService.java:1413) at io.undertow.servlet@2.3.10.Final//io.undertow.servlet.core.DeploymentManagerImpl.deploy(DeploymentManagerImpl.java:255) at org.wildfly.extension.undertow@30.0.1.Final//org.wildfly.extension.undertow.deployment.UndertowDeploymentService.startContext(UndertowDeploymentService.java:88) at org.wildfly.extension.undertow@30.0.1.Final//org.wildfly.extension.undertow.deployment.UndertowDeploymentService$1.run(UndertowDeploymentService.java:70) at java.base/java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:572) at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:317) at org.jboss.threads@2.4.0.Final//org.jboss.threads.ContextClassLoaderSavingRunnable.run(ContextClassLoaderSavingRunnable.java:35) at org.jboss.threads@2.4.0.Final//org.jboss.threads.EnhancedQueueExecutor.safeRun(EnhancedQueueExecutor.java:1990) at org.jboss.threads@2.4.0.Final//org.jboss.threads.EnhancedQueueExecutor$ThreadBody.doRunTask(EnhancedQueueExecutor.java:1486) at org.jboss.threads@2.4.0.Final//org.jboss.threads.EnhancedQueueExecutor$ThreadBody.run(EnhancedQueueExecutor.java:1377) at java.base/java.lang.Thread.run(Thread.java:1583) at org.jboss.threads@2.4.0.Final//org.jboss.threads.JBossThread.run(JBossThread.java:513) Caused by: java.lang.RuntimeException: Descriptor not available. at deployment.APP.war//org.carrot2.core.ProcessingComponentDescriptor.getBindableDescriptor(ProcessingComponentDescriptor.java:253) at deployment.APP.war//org.carrot2.webapp.model.WebappConfig.prepareSourceAttributeMetadata(WebappConfig.java:229) at deployment.APP.war//org.carrot2.webapp.model.WebappConfig.getSingleton(WebappConfig.java:165) ... 21 more Caused by: java.lang.NoClassDefFoundError: Descriptor class not found: org.carrot2.source.solr.SolrDocumentSourceModelIssueDescriptor at deployment.APP.war//org.carrot2.util.attribute.BindableDescriptorUtils.getDescriptorClass(BindableDescriptorUtils.java:80) at deployment.APP.war//org.carrot2.util.attribute.BindableDescriptorUtils.getDescriptor(BindableDescriptorUtils.java:96) at deployment.APP.war//org.carrot2.util.attribute.BindableMetadata.forClassWithParents(BindableMetadata.java:62) at deployment.APP.war//org.carrot2.util.attribute.BindableDescriptorBuilder.buildDescriptor(BindableDescriptorBuilder.java:69) at deployment.APP.war//org.carrot2.util.attribute.BindableDescriptorBuilder.buildDescriptor(BindableDescriptorBuilder.java:47) at deployment.APP.war//org.carrot2.core.ProcessingComponentDescriptor.onCommit(ProcessingComponentDescriptor.java:326) at java.base/jdk.internal.reflect.DirectMethodHandleAccessor.invoke(DirectMethodHandleAccessor.java:103) at java.base/java.lang.reflect.Method.invoke(Method.java:580) at deployment.APP.war//org.simpleframework.xml.core.Function.call(Function.java:84) at deployment.APP.war//org.simpleframework.xml.core.Caller.commit(Caller.java:141) at deployment.APP.war//org.simpleframework.xml.core.Composite.read(Composite.java:204) at deployment.APP.war//org.simpleframework.xml.core.Composite.read(Composite.java:148) at deployment.APP.war//org.simpleframework.xml.core.Traverser.read(Traverser.java:92) at deployment.APP.war//org.simpleframework.xml.core.CompositeList.populate(CompositeList.java:175) at deployment.APP.war//org.simpleframework.xml.core.CompositeList.read(CompositeList.java:120) at deployment.APP.war//org.simpleframework.xml.core.Composite.readVariable(Composite.java:623) at deployment.APP.war//org.simpleframework.xml.core.Composite.readInstance(Composite.java:573) at deployment.APP.war//org.simpleframework.xml.core.Composite.readUnion(Composite.java:549) at deployment.APP.war//org.simpleframework.xml.core.Composite.readElement(Composite.java:532) at deployment.APP.war//org.simpleframework.xml.core.Composite.readElements(Composite.java:445) at deployment.APP.war//org.simpleframework.xml.core.Composite.access$400(Composite.java:59) at deployment.APP.war//org.simpleframework.xml.core.Composite$Builder.read(Composite.java:1383) at deployment.APP.war//org.simpleframework.xml.core.Composite.read(Composite.java:201) at deployment.APP.war//org.simpleframework.xml.core.Composite.read(Composite.java:148) at deployment.APP.war//org.simpleframework.xml.core.Traverser.read(Traverser.java:92) at deployment.APP.war//org.simpleframework.xml.core.Persister.read(Persister.java:625) at deployment.APP.war//org.simpleframework.xml.core.Persister.read(Persister.java:606) at deployment.APP.war//org.simpleframework.xml.core.Persister.read(Persister.java:584) at deployment.APP.war//org.simpleframework.xml.core.Persister.read(Persister.java:543) at deployment.APP.war//org.simpleframework.xml.core.Persister.read(Persister.java:444) at deployment.APP.war//org.carrot2.core.ProcessingComponentSuite.deserialize(ProcessingComponentSuite.java:163) at deployment.APP.war//org.carrot2.core.ProcessingComponentSuite.postDeserialize(ProcessingComponentSuite.java:126) at java.base/jdk.internal.reflect.DirectMethodHandleAccessor.invoke(DirectMethodHandleAccessor.java:103) at java.base/java.lang.reflect.Method.invoke(Method.java:580) at deployment.APP.war//org.simpleframework.xml.core.Function.call(Function.java:84) at deployment.APP.war//org.simpleframework.xml.core.Caller.commit(Caller.java:141) at deployment.APP.war//org.simpleframework.xml.core.Composite.read(Composite.java:204) at deployment.APP.war//org.simpleframework.xml.core.Composite.read(Composite.java:148) at deployment.APP.war//org.simpleframework.xml.core.Traverser.read(Traverser.java:92) at deployment.APP.war//org.simpleframework.xml.core.Persister.read(Persister.java:625) at deployment.APP.war//org.simpleframework.xml.core.Persister.read(Persister.java:606) at deployment.APP.war//org.simpleframework.xml.core.Persister.read(Persister.java:584) at deployment.APP.war//org.simpleframework.xml.core.Persister.read(Persister.java:543) at deployment.APP.war//org.simpleframework.xml.core.Persister.read(Persister.java:444) at deployment.APP.war//org.carrot2.core.ProcessingComponentSuite.deserialize(ProcessingComponentSuite.java:163) at deployment.APP.war//org.carrot2.webapp.model.WebappConfig.getSingleton(WebappConfig.java:159) ... 21 more Here I have checked it with widlfly 24 and java 8 version and without any changes it works fine but when change the java version and related Gradle version than facing above errors, I dig into it and came to know than after java 8 modification few jar has been removed in latest version like 9 ,11 . I am not able to load class using jboss ModuleLoader. Do I missed any configuration need to do related to java versions ? Can anyone help to fix the same ?? any suggestion ?? Thanks in advance !