title: Jenkins pipeline - getting a security error, how can I prevent the error from being raised?
body: <p>I'm writing an Android build prcoess in Jenkins pipeline as a code.
  The relevant portion of the script is:</p>
  
  <pre><code>def notifyStarted() {
    // send to Slack
    slackSend (channel: '#slack-test', color: 'warning', message: "STARTED: Job '${env.JOB_NAME} [${env.BUILD_NUMBER}]' (${env.BUILD_URL})")
  }
  def get_current_time_date() {
      Date date = new Date();   // given date
      Calendar calendar = GregorianCalendar.getInstance(); // creates a new calendar instance
      calendar.setTime(date);   // assigns calendar to given date
      TIMEH = calendar.get(Calendar.HOUR_OF_DAY); // gets hour in 24h format
      TIMEM = calendar.get(Calendar.MINUTE);
      TIMES = calendar.get(Calendar.SECOND);
      newdate = date.format( 'yyyy-MM-dd' );
      def result = newdate + '%' + TIMEH + ':' + TIMEM + ':' + TIMES
      result
  }
  // Mixpanel parameters
  
  // End of Mixpanel parameters
  
  node ('master') {
      notifyStarted()
      sh '( git reset --hard; git clean -fxd; git tag -d $(git tag) ) &amp;&gt;/dev/null || true'
      checkout scm
      MP_VERSION_NAME = sh '(git tag | grep '^[0-9]' | tail -n 1)'
      MP_API_KEY = "cXXXXXXXXXf"
      MP_API_SECRET = "4XXXXXXXXX4"
      MP_EXPIRE = "1588896000"
      MP_APP_PLATFORM = "Android"
      MP_BASE_URL = "http://mixpanel.com/api/2.0/annotations/create?"
      //RELEASE_DATE =  get_current_time_date()
      MP_RELEASE_NOTES = ""
      DESCRIPTION = "${MP_APP_PLATFORM}%v${MP_VERSION_NAME}${MP_RELEASE_NOTES}"
      REQUEST_URL = "api_key=${MP_API_KEY}&amp;date=${RELEASE_DATE}&amp;description=${DESCRIPTION}&amp;expire=${MP_EXPIRE}"
      REQUEST_URL_NO_AMPERSAND = REQUEST_URL.replaceAll('&amp;','')
      REQUEST_URL_API_SECRET = "${REQUEST_URL_NO_AMPERSAND}${MP_API_SECRET}"
      SIGNATURE = "md5 -q -s ${REQUEST_URL_API_SECRET}".execute().text
      CURL_COMMAND = "${MP_BASE_URL}${REQUEST_URL}&amp;sig=${SIGNATURE}".replaceAll(' ','%20')
      def cwd = pwd()
      stage ('Compilation environement preparation') {
          // Build parameters
          NDK_VER="r12b"
          SDK_VER="r24.4.1"
          GRADLE_USER_HOME="${cwd}/.gradle"
          NDK_DIR="${GRADLE_USER_HOME}/android-ndk-${NDK_VER}"
          SDK_DIR="${GRADLE_USER_HOME}/android-sdk-linux"
          SDK_TOOLS="${SDK_DIR}/tools"
          AAPT="${SDK_DIR}/build-tools/23.0.3"
  </code></pre>
  
  <p>When running the build, I get the following error:</p>
  
  <pre><code>org.jenkinsci.plugins.scriptsecurity.sandbox.RejectedAccessException: unclassified method java.lang.String xor java.util.ArrayList
      at org.jenkinsci.plugins.scriptsecurity.sandbox.groovy.SandboxInterceptor.onMethodCall(SandboxInterceptor.java:113)
      at org.kohsuke.groovy.sandbox.impl.Checker$1.call(Checker.java:149)
      at org.kohsuke.groovy.sandbox.impl.Checker.checkedCall(Checker.java:146)
      at com.cloudbees.groovy.cps.sandbox.SandboxInvoker.methodCall(SandboxInvoker.java:16)
      at WorkflowScript.run(WorkflowScript:30)
      at ___cps.transform___(Native Method)
      at com.cloudbees.groovy.cps.impl.ContinuationGroup.methodCall(ContinuationGroup.java:48)
      at com.cloudbees.groovy.cps.impl.FunctionCallBlock$ContinuationImpl.dispatchOrArg(FunctionCallBlock.java:109)
      at com.cloudbees.groovy.cps.impl.FunctionCallBlock$ContinuationImpl.fixArg(FunctionCallBlock.java:82)
      at sun.reflect.GeneratedMethodAccessor243.invoke(Unknown Source)
      at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
      at java.lang.reflect.Method.invoke(Method.java:498)
      at com.cloudbees.groovy.cps.impl.ContinuationPtr$ContinuationImpl.receive(ContinuationPtr.java:72)
      at com.cloudbees.groovy.cps.impl.CollectionLiteralBlock$ContinuationImpl.dispatch(CollectionLiteralBlock.java:55)
      at com.cloudbees.groovy.cps.impl.CollectionLiteralBlock$ContinuationImpl.item(CollectionLiteralBlock.java:45)
      at sun.reflect.GeneratedMethodAccessor244.invoke(Unknown Source)
      at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
      at java.lang.reflect.Method.invoke(Method.java:498)
      at com.cloudbees.groovy.cps.impl.ContinuationPtr$ContinuationImpl.receive(ContinuationPtr.java:72)
      at com.cloudbees.groovy.cps.impl.ContinuationGroup.methodCall(ContinuationGroup.java:50)
      at com.cloudbees.groovy.cps.impl.FunctionCallBlock$ContinuationImpl.dispatchOrArg(FunctionCallBlock.java:109)
      at com.cloudbees.groovy.cps.impl.FunctionCallBlock$ContinuationImpl.fixArg(FunctionCallBlock.java:82)
      at sun.reflect.GeneratedMethodAccessor243.invoke(Unknown Source)
      at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
      at java.lang.reflect.Method.invoke(Method.java:498)
      at com.cloudbees.groovy.cps.impl.ContinuationPtr$ContinuationImpl.receive(ContinuationPtr.java:72)
      at com.cloudbees.groovy.cps.impl.ConstantBlock.eval(ConstantBlock.java:21)
      at com.cloudbees.groovy.cps.Next.step(Next.java:58)
      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:163)
      at org.jenkinsci.plugins.workflow.cps.CpsThreadGroup.run(CpsThreadGroup.java:324)
      at org.jenkinsci.plugins.workflow.cps.CpsThreadGroup.access$100(CpsThreadGroup.java:78)
      at org.jenkinsci.plugins.workflow.cps.CpsThreadGroup$2.call(CpsThreadGroup.java:236)
      at org.jenkinsci.plugins.workflow.cps.CpsThreadGroup$2.call(CpsThreadGroup.java:224)
      at org.jenkinsci.plugins.workflow.cps.CpsVmExecutorService$2.call(CpsVmExecutorService.java:63)
      at java.util.concurrent.FutureTask.run(FutureTask.java:266)
      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(Executors.java:511)
      at java.util.concurrent.FutureTask.run(FutureTask.java:266)
      at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
      at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
      at java.lang.Thread.run(Thread.java:745)
  Finished: FAILURE
  </code></pre>
  
  <p>I believe the issue has something to do with the get_current_time_date function but I'm not sure how.</p>
  
  <p>I've read about the error on the internet and found that I can go to Jenkins -> Manage Jenkins -> In-process Script Approval and approve certain code runs but how can I prevent this from happening? I'm not sure which code (out of 3) or which signature (out of 3) are the ones I should approve and in any case I want the pipeline to be able to run automatically, without human intervention.</p>
  
  <p>Any idea what causes this error?</p>