title: How to print a Groovy variable in Jenkins?
body: <p>I have the following code within a Jenkins pipeline:</p>
  <pre><code>stage ('Question') {
      try {
          timeout(time: 1, unit: 'MINUTES') {
              userInput = input message: 'Choose server to publish to:', ok: '', parameters: [
                  [$class: 'hudson.model.ChoiceParameterDefinition', choices: 'pc-ensureint\nother-server', description: 'Choose server to publish to:', name: 'server']
          ] 
        }
      } catch (err) {
          userInput = [server: 'pc-ensureint'] // if an error is caught set this value
      }
  }
  
  node () {
      println ${server}
  }
  </code></pre>
  <p>I'm trying to troubleshoot a problem with the <code>server</code> variable which is set in the <code>ChoiceParameterDefinition</code>.</p>
  <p>When I run the build, I get the following error:</p>
  <pre><code>java.lang.NoSuchMethodError: No such DSL method '$' found among steps [AddInteractivePromotion, ArtifactoryGradleBuild, ArtifactoryMavenBuild, ConanAddRemote, ConanAddUser, InitConanClient, MavenDescriptorStep, RunConanCommand, ansiblePlaybook, archive, artifactoryDownload, artifactoryPromoteBuild, artifactoryUpload, bat, build, catchError, checkout, collectEnv, deleteDir, dir, dockerFingerprintFrom, dockerFingerprintRun, dockerPullStep, dockerPushStep, echo, emailext, emailextrecipients, envVarsForTool, error, fileExists, getArtifactoryServer, getContext, getDatabaseConnection, git, input, isUnix, library, libraryResource, load, mail, milestone, newArtifactoryServer, newBuildInfo, newGradleBuild, newMavenBuild, node, parallel, properties, publishBuildInfo, pwd, readFile, readTrusted, resolveScm, retry, script, sh, sleep, sql, stage, stash, step, svn, timeout, timestamps, tool, unarchive, unstash, validateDeclarativePipeline, waitForQualityGate, waitUntil, withContext, withCredentials, withDockerContainer, withDockerRegistry, withDockerServer, withEnv, wrap, writeFile, ws, xrayScanBuild] or symbols [all, allOf, always, ant, antFromApache, antOutcome, antTarget, any, anyOf, apiToken, architecture, archiveArtifacts, artifactManager, batchFile, booleanParam, branch, buildButton, buildDiscarder, caseInsensitive, caseSensitive, choice, choiceParam, cleanWs, clock, cloud, command, configFile, configFileProvider, cron, crumb, defaultView, demand, disableConcurrentBuilds, docker, dockerfile, downloadSettings, downstream, dumb, envVars, environment, expression, file, fileParam, filePath, fingerprint, frameOptions, freeStyle, freeStyleJob, git, github, githubPush, gradle, hyperlink, hyperlinkToModels, installSource, jdk, jdkInstaller, jgit, jgitapache, jnlp, jobName, junit, label, lastDuration, lastFailure, lastGrantedAuthorities, lastStable, lastSuccess, legacy, legacySCM, list, local, location, logRotator, loggedInUsersCanDoAnything, masterBuild, maven, maven3Mojos, mavenErrors, mavenMojos, mavenWarnings, modernSCM, msbuild, msbuildError, msbuildWarning, myView, node, nodeProperties, nonStoredPasswordParam, none, not, overrideIndexTriggers, paneStatus, parameters, password, pattern, pipeline-model, pipelineTriggers, plainText, plugin, pollSCM, projectNamingStrategy, proxy, queueItemAuthenticator, quietPeriod, remotingCLI, run, runParam, schedule, scmRetryCount, search, security, shell, skipDefaultCheckout, skipStagesAfterUnstable, slave, stackTrace, standard, status, string, stringParam, swapSpace, text, textParam, tmpSpace, toolLocation, unsecured, upstream, usernameColonPassword, usernamePassword, viewsTabBar, weather, withSonarQubeEnv, zfs, zip] or globals [Artifactory, currentBuild, docker, env, params, pipeline, scm]
      at org.jenkinsci.plugins.workflow.cps.DSL.invokeMethod(DSL.java:149)
      at org.jenkinsci.plugins.workflow.cps.CpsScript.invokeMethod(CpsScript.java:108)
      at groovy.lang.GroovyObject$invokeMethod.call(Unknown Source)
      at org.codehaus.groovy.runtime.callsite.CallSiteArray.defaultCall(CallSiteArray.java:48)
      at org.codehaus.groovy.runtime.callsite.AbstractCallSite.call(AbstractCallSite.java:113)
      at org.kohsuke.groovy.sandbox.impl.Checker$1.call(Checker.java:151)
      at org.kohsuke.groovy.sandbox.GroovyInterceptor.onMethodCall(GroovyInterceptor.java:21)
      at org.jenkinsci.plugins.scriptsecurity.sandbox.groovy.SandboxInterceptor.onMethodCall(SandboxInterceptor.java:115)
      at org.kohsuke.groovy.sandbox.impl.Checker$1.call(Checker.java:149)
      at org.kohsuke.groovy.sandbox.impl.Checker.checkedCall(Checker.java:146)
      at org.kohsuke.groovy.sandbox.impl.Checker.checkedCall(Checker.java:123)
      at org.kohsuke.groovy.sandbox.impl.Checker.checkedCall(Checker.java:123)
      at com.cloudbees.groovy.cps.sandbox.SandboxInvoker.methodCall(SandboxInvoker.java:16)
      at WorkflowScript.run(WorkflowScript:16)
      at ___cps.transform___(Native Method)
      at com.cloudbees.groovy.cps.impl.ContinuationGroup.methodCall(ContinuationGroup.java:57)
      at com.cloudbees.groovy.cps.impl.FunctionCallBlock$ContinuationImpl.dispatchOrArg(FunctionCallBlock.java:109)
      at com.cloudbees.groovy.cps.impl.FunctionCallBlock$ContinuationImpl.fixArg(FunctionCallBlock.java:82)
      at sun.reflect.GeneratedMethodAccessor637.invoke(Unknown Source)
      at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
      at java.lang.reflect.Method.invoke(Unknown Source)
      at com.cloudbees.groovy.cps.impl.ContinuationPtr$ContinuationImpl.receive(ContinuationPtr.java:72)
      at com.cloudbees.groovy.cps.impl.ClosureBlock.eval(ClosureBlock.java:46)
      at com.cloudbees.groovy.cps.Next.step(Next.java:74)
      at com.cloudbees.groovy.cps.Continuable.run0(Continuable.java:154)
      at org.jenkinsci.plugins.workflow.cps.SandboxContinuable.access$001(SandboxContinuable.java:18)
      at org.jenkinsci.plugins.workflow.cps.SandboxContinuable$1.call(SandboxContinuable.java:33)
      at org.jenkinsci.plugins.workflow.cps.SandboxContinuable$1.call(SandboxContinuable.java:30)
      at org.jenkinsci.plugins.scriptsecurity.sandbox.groovy.GroovySandbox.runInSandbox(GroovySandbox.java:108)
      at org.jenkinsci.plugins.workflow.cps.SandboxContinuable.run0(SandboxContinuable.java:30)
      at org.jenkinsci.plugins.workflow.cps.CpsThread.runNextChunk(CpsThread.java:165)
      at org.jenkinsci.plugins.workflow.cps.CpsThreadGroup.run(CpsThreadGroup.java:330)
      at org.jenkinsci.plugins.workflow.cps.CpsThreadGroup.access$100(CpsThreadGroup.java:82)
      at org.jenkinsci.plugins.workflow.cps.CpsThreadGroup$2.call(CpsThreadGroup.java:242)
      at org.jenkinsci.plugins.workflow.cps.CpsThreadGroup$2.call(CpsThreadGroup.java:230)
      at org.jenkinsci.plugins.workflow.cps.CpsVmExecutorService$2.call(CpsVmExecutorService.java:64)
      at java.util.concurrent.FutureTask.run(Unknown Source)
      at hudson.remoting.SingleLaneExecutorService$1.run(SingleLaneExecutorService.java:112)
      at jenkins.util.ContextResettingExecutorService$1.run(ContextResettingExecutorService.java:28)
      at java.util.concurrent.Executors$RunnableAdapter.call(Unknown Source)
      at java.util.concurrent.FutureTask.run(Unknown Source)
      at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
      at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
      at java.lang.Thread.run(Unknown Source)
  Finished: FAILURE
  </code></pre>
  <p>As far as I know, <code>server</code> is a groovy variable and thus I'm supposed to be able to access it using <code>${</code> <code>}</code>.</p>
  <p>So I've tried:</p>
  <pre><code>echo ${server}
  print ${server}
  println ${server}
  println &quot;${server}&quot;
  </code></pre>
  <p>But no matter what I try I keep getting this error.</p>
  <p>Any idea what I'm doing wrong?</p>