pipeline {
    options {
        parallelsAlwaysFailFast()
        buildDiscarder(logRotator(artifactDaysToKeepStr: '', artifactNumToKeepStr: '', daysToKeepStr: '7', numToKeepStr: ''))
        timestamps()
    }
    agent none
    stages {
        stage ("Error Stage") {
            when {
                beforeAgent true
                expression { true }
            }
            agent any
            steps { 
                echo "Echo"
                error "Error"
                echo "After Error"
            }
            
        }
        stage ("Parallel Stages") {
            when {expression { true }}
            parallel{
                stage('Parallel 1') {
                when {
                    beforeAgent true
                    expression { true }
                }
                agent any
                steps {
                    echo "Echo Steps 1"
                }
                post {
                    cleanup {
                        echo "cleanup 1"
                    }
                    failure {
                        echo "failure 1"
                    }    
                    aborted {
                        echo "aborted 1"
                    }
                }
            }
                stage('Parallel 2') {
                when {
                    beforeAgent true
                    expression { true }
                }
                agent any
                steps {
                    echo "Echo Steps 2"
                }
                post {
                    cleanup {
                        echo "cleanup 2"
                    }
                    failure {
                        echo "failure 2"
                    }    
                    aborted {
                        echo "aborted 2"
                    }
                }
            }
            }
        }
    }
    post {
        failure {
            echo "Failure"
        }
        always { 
            echo "Always"
        }
    }
} 

16:02:03  Started by user Bilal Yaylak
16:02:04  [Pipeline] Start of Pipeline
16:02:05  [Pipeline] timestamps
16:02:05  The timestamps step is unnecessary when timestamps are enabled for all Pipeline builds.
16:02:05  [Pipeline] {
16:02:05  [Pipeline] stage
16:02:05  [Pipeline] { (Error Stage)
16:02:05  [Pipeline] node
16:02:05  Running on ******** in C:\JenkinsWorkspaces\1\workspace\groovy-plugin-test
16:02:05  [Pipeline] {
16:02:05  [Pipeline] echo
16:02:05  Echo
16:02:05  [Pipeline] error
16:02:05  [Pipeline] }
16:02:05  [Pipeline] // node
16:02:05  [Pipeline] }
16:02:05  [Pipeline] // stage
16:02:05  [Pipeline] stage
16:02:05  [Pipeline] { (Parallel Stages)
16:02:05  Stage "Parallel Stages" skipped due to earlier failure(s)
16:02:05  [Pipeline] getContext
16:02:05  [Pipeline] parallel
16:02:05  [Pipeline] { (Branch: Parallel 1)
16:02:05  [Pipeline] { (Branch: Parallel 2)
16:02:05  [Pipeline] stage
16:02:05  [Pipeline] { (Parallel 1)
16:02:05  [Pipeline] stage
16:02:05  [Pipeline] { (Parallel 2)
16:02:05  Stage "Parallel 1" skipped due to earlier failure(s)
16:02:05  [Pipeline] getContext
16:02:05  [Pipeline] }
16:02:05  Stage "Parallel 2" skipped due to earlier failure(s)
16:02:05  [Pipeline] getContext
16:02:05  [Pipeline] }
16:02:05  [Pipeline] // stage
16:02:05  [Pipeline] // stage
16:02:05  [Pipeline] }
16:02:05  Failed in branch Parallel 1
16:02:05  [Pipeline] }
16:02:05  Failed in branch Parallel 2
16:02:05  Terminating timestamps (id: 3)
16:02:05  Terminating stage (id: 15)
16:02:05  Terminating parallel (id: 18)
16:02:05  [Pipeline] End of Pipeline
16:02:05  Also:   org.jenkinsci.plugins.workflow.actions.ErrorAction$ErrorId: fcbd3f7d-7035-4377-9f95-5592f79ee7d6
16:02:05  java.lang.NullPointerException: Cannot read field "group" because "this.this$0.thread" is null
16:02:05  	at PluginClassLoader for workflow-cps//org.jenkinsci.plugins.workflow.cps.CpsBodyExecution$2.onSuccess(CpsBodyExecution.java:254)
16:02:05  	at PluginClassLoader for workflow-cps//org.jenkinsci.plugins.workflow.cps.CpsBodyExecution$2.onSuccess(CpsBodyExecution.java:249)
16:02:05  	at PluginClassLoader for workflow-cps//org.jenkinsci.plugins.workflow.cps.CpsFlowExecution$4$1.run(CpsFlowExecution.java:995)
16:02:05  	at PluginClassLoader for workflow-cps//org.jenkinsci.plugins.workflow.cps.CpsVmExecutorService.lambda$wrap$2(CpsVmExecutorService.java:85)
16:02:05  	at java.base/java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:572)
16:02:05  	at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:317)
16:02:05  	at hudson.remoting.SingleLaneExecutorService$1.run(SingleLaneExecutorService.java:139)
16:02:05  	at jenkins.util.ContextResettingExecutorService$1.run(ContextResettingExecutorService.java:28)
16:02:05  	at jenkins.security.ImpersonatingExecutorService$1.run(ImpersonatingExecutorService.java:68)
16:02:05  	at jenkins.util.ErrorLoggingExecutorService.lambda$wrap$0(ErrorLoggingExecutorService.java:51)
16:02:05  	at java.base/java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:572)
16:02:05  	at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:317)
16:02:05  	at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1144)
16:02:05  	at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:642)
16:02:05  	at PluginClassLoader for workflow-cps//org.jenkinsci.plugins.workflow.cps.CpsVmExecutorService$1.call(CpsVmExecutorService.java:53)
16:02:05  	at PluginClassLoader for workflow-cps//org.jenkinsci.plugins.workflow.cps.CpsVmExecutorService$1.call(CpsVmExecutorService.java:50)
16:02:05  	at org.codehaus.groovy.runtime.GroovyCategorySupport$ThreadCategoryInfo.use(GroovyCategorySupport.java:136)
16:02:05  	at org.codehaus.groovy.runtime.GroovyCategorySupport.use(GroovyCategorySupport.java:275)
16:02:05  	at PluginClassLoader for workflow-cps//org.jenkinsci.plugins.workflow.cps.CpsVmExecutorService.lambda$categoryThreadFactory$0(CpsVmExecutorService.java:50)
16:02:05  	at java.base/java.lang.Thread.run(Thread.java:1583)
16:02:05  Finished: FAILURE