Cannot invoke method call() on null object at org.codehaus.groovy.runtime.NullObject.invokeMethod(NullObject.java:91)

Using Jenkins
1

Hi community,

I started learning Jenkins just about yesterday, so I have created this simple script to just print a simple echo from a script.groovy file that’s in the same path of the git project, but build is failing.

I would like some help if possible, to point me into the right direction.

Checked linting and if I have forgotten something in both of the files, but cannot find where would the issue come from. Thank you very much for any help!

This is the Jenkinsfile:

def gv
pipeline { 
    agent any
           parameters {
            choice(name: 'VERSION', choices: ['1.1.0', '1.2.0', '1.3.0'], description: '')
            booleanParam(name: 'executeTests', defaultValue: true, description: '')
           }

    stages {
        stage("init") {
            steps {
                script {
                    gv load = "script.groovy"
                }
            }
        }
        stage("build") {
            steps {
                script {
                 
                    gv.buildApp()
                }

            }
        }
        stage("test") {
            when {
             
                expression {
                    params.executeTests
                }
            }
            steps {
                script {
                    gv.testApp()
                }
            }
        }
        stage ("deploy") {
            steps {
                expression {
                    env.BRANCH_NAME == 'feature/jenkins-jobs'
                }
                  script {
                gv.deployApp()
                
                }
            }
          
        }
    }
}

And here's the script.groovy file:

 

def buildApp() {
    echo "building the application..."
} 
def testApp() {
    echo "testing the application"
    
    }
def deployApp() {
    echo "deploying the ${params.VERSION}"
} 
return this

Here’s a part of the build failure in the Console output:


[Pipeline] }
[Pipeline] // withEnv
[Pipeline] }
[Pipeline] // node
[Pipeline] End of Pipeline
java.lang.NullPointerException: Cannot invoke method call() on null object
    at org.codehaus.groovy.runtime.NullObject.invokeMethod(NullObject.java:91)
    at org.codehaus.groovy.runtime.callsite.PogoMetaClassSite.call(PogoMetaClassSite.java:47)
    at org.codehaus.groovy.runtime.callsite.CallSiteArray.defaultCall(CallSiteArray.java:47)
    at org.codehaus.groovy.runtime.callsite.NullCallSite.call(NullCallSite.java:34)
    at org.codehaus.groovy.runtime.callsite.CallSiteArray.defaultCall(CallSiteArray.java:47)
    at org.codehaus.groovy.runtime.callsite.AbstractCallSite.call(AbstractCallSite.java:116)
    at org.kohsuke.groovy.sandbox.impl.Checker$1.call(Checker.java:180)
    at org.kohsuke.groovy.sandbox.impl.Checker.checkedCall(Checker.java:182)
    at com.cloudbees.groovy.cps.sandbox.SandboxInvoker.methodCall(SandboxInvoker.java:17)
    at WorkflowScript.run(WorkflowScript:21)
    at ___cps.transform___(Native Method)
    at com.cloudbees.groovy.cps.impl.ContinuationGroup.methodCall(ContinuationGroup.java:90)
    at com.cloudbees.groovy.cps.impl.FunctionCallBlock$ContinuationImpl.dispatchOrArg(FunctionCallBlock.java:116)
    at com.cloudbees.groovy.cps.impl.FunctionCallBlock$ContinuationImpl.fixArg(FunctionCallBlock.java:85)
    at jdk.internal.reflect.GeneratedMethodAccessor513.invoke(Unknown Source)
    at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.base/java.lang.reflect.Method.invoke(Method.java:566)
    at com.cloudbees.groovy.cps.impl.ContinuationPtr$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:83)
    at com.cloudbees.groovy.cps.Continuable$1.call(Continuable.java:152)
    at com.cloudbees.groovy.cps.Continuable$1.call(Continuable.java:146)
    at org.codehaus.groovy.runtime.GroovyCategorySupport$ThreadCategoryInfo.use(GroovyCategorySupport.java:136)
    at org.codehaus.groovy.runtime.GroovyCategorySupport.use(GroovyCategorySupport.java:275)
    at com.cloudbees.groovy.cps.Continuable.run0(Continuable.java:146)
    at org.jenkinsci.plugins.workflow.cps.SandboxContinuable.access$001(SandboxContinuable.java:18)
    at org.jenkinsci.plugins.workflow.cps.SandboxContinuable.run0(SandboxContinuable.java:51)
    at org.jenkinsci.plugins.workflow.cps.CpsThread.runNextChunk(CpsThread.java:187)
    at org.jenkinsci.plugins.workflow.cps.CpsThreadGroup.run(CpsThreadGroup.java:420)
    at org.jenkinsci.plugins.workflow.cps.CpsThreadGroup$2.call(CpsThreadGroup.java:330)
    at org.jenkinsci.plugins.workflow.cps.CpsThreadGroup$2.call(CpsThreadGroup.java:294)
    at org.jenkinsci.plugins.workflow.cps.CpsVmExecutorService$2.call(CpsVmExecutorService.java:67)
    at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:264)
    at hudson.remoting.SingleLaneExecutorService$1.run(SingleLaneExecutorService.java:139)
    at jenkins.util.ContextResettingExecutorService$1.run(ContextResettingExecutorService.java:30)
    at jenkins.security.ImpersonatingExecutorService$1.run(ImpersonatingExecutorService.java:70)
    at java.base/java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:515)
    at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:264)
    at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128)
    at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628)
    at java.base/java.lang.Thread.run(Thread.java:829)
Finished: FAILURE
2

That line looks strange in your pipeline

that should be
gv = load "script.groovy"

3

thanks a lot @mawinter69!!! That was it. Once that stage pushed forward, i also realized i had skipped script.groovy in .gitignore… Many thanks!