Nullpointer Error in groovy script while trying to add xpath assertion

Question

I am getting an error as

java.lang.NullPointerException: Cannot invoke method getAssertionByName() on null object error at line: 5

however I am able to add xpath assertion in the test case. As, I am new to groovy so want to know :-

What is the reason that I am getting this error.
How can I implement a code for select from current option in xpath assertion so that i can add xpath instead of printing some junk value(i have printed "hello" as of now).

log.info("Testing Start")
def project = context.testCase.testSuite.project
TSName = "ManagePostpayInsurance_1_0"
StepName = "getInsuranceDetails_FC_004"
project.getTestSuiteList().each {
    if(it.name == TSName) {
        TS = it.name
        it.getTestCaseList().each {
            TC =it.name
            def asserting = project.getTestSuiteByName(TS).getTestCaseByName(TC).getTestStepByName(StepName).getAssertionByName("XPath Match")
            log.info(asserting)
            if (asserting instanceof com.eviware.soapui.impl.wsdl.teststeps.assertions.basic.XPathContainsAssertion){
                project.getTestSuiteByName(TS).getTestCaseByName(TC).getTestStepByName(StepName).removeAssertion(asserting)
            }
            def assertion = project.getTestSuiteByName(TS).getTestCaseByName(TC)getTestStepByName(StepName).addAssertion("XPath Match")
            assertion.path = "declare namespace cor='http://soa.o2.co.uk/coredata_1';\ndeclare namespace man='http://soa.o2.co.uk/managepostpayinsurancedata_1';\ndeclare namespace soapenv='http://schemas.xmlsoap.org/soap/envelope/';\n//man:getInsuranceDetails_1Response"
            assertion.expectedContent = "hello"            
        }
    }
}
log.info("Testing Over")

I have attached the error log below.

Mon Nov 27 17:04:12 IST 2017:ERROR:java.lang.NullPointerException: Cannot invoke method getAssertionByName() on null object
   java.lang.NullPointerException: Cannot invoke method getAssertionByName() on null object
    at org.codehaus.groovy.runtime.NullObject.invokeMethod(NullObject.java:77)
    at org.codehaus.groovy.runtime.callsite.PogoMetaClassSite.call(PogoMetaClassSite.java:45)
    at org.codehaus.groovy.runtime.callsite.CallSiteArray.defaultCall(CallSiteArray.java:45)
    at org.codehaus.groovy.runtime.callsite.NullCallSite.call(NullCallSite.java:32)
    at org.codehaus.groovy.runtime.callsite.CallSiteArray.defaultCall(CallSiteArray.java:45)
    at com.eviware.soapui.model.testsuite.Assertable$getAssertionByName.call(Unknown Source)
    at Script10$_run_closure1_closure2.doCall(Script10.groovy:11)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
    at java.lang.reflect.Method.invoke(Unknown Source)
    at org.codehaus.groovy.reflection.CachedMethod.invoke(CachedMethod.java:90)
    at groovy.lang.MetaMethod.doMethodInvoke(MetaMethod.java:233)
    at org.codehaus.groovy.runtime.metaclass.ClosureMetaClass.invokeMethod(ClosureMetaClass.java:272)
    at groovy.lang.MetaClassImpl.invokeMethod(MetaClassImpl.java:909)
    at groovy.lang.Closure.call(Closure.java:411)
    at groovy.lang.Closure.call(Closure.java:427)
    at org.codehaus.groovy.runtime.DefaultGroovyMethods.each(DefaultGroovyMethods.java:1325)
    at org.codehaus.groovy.runtime.DefaultGroovyMethods.each(DefaultGroovyMethods.java:1297)
    at org.codehaus.groovy.runtime.dgm$148.invoke(Unknown Source)
    at org.codehaus.groovy.runtime.callsite.PojoMetaMethodSite$PojoMetaMethodSiteNoUnwrapNoCoerce.invoke(PojoMetaMethodSite.java:271)
    at org.codehaus.groovy.runtime.callsite.PojoMetaMethodSite.call(PojoMetaMethodSite.java:53)
    at org.codehaus.groovy.runtime.callsite.CallSiteArray.defaultCall(CallSiteArray.java:45)
    at org.codehaus.groovy.runtime.callsite.AbstractCallSite.call(AbstractCallSite.java:108)
    at org.codehaus.groovy.runtime.callsite.AbstractCallSite.call(AbstractCallSite.java:116)
    at Script10$_run_closure1.doCall(Script10.groovy:9)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
    at java.lang.reflect.Method.invoke(Unknown Source)
    at org.codehaus.groovy.reflection.CachedMethod.invoke(CachedMethod.java:90)
    at groovy.lang.MetaMethod.doMethodInvoke(MetaMethod.java:233)
    at org.codehaus.groovy.runtime.metaclass.ClosureMetaClass.invokeMethod(ClosureMetaClass.java:272)
    at groovy.lang.MetaClassImpl.invokeMethod(MetaClassImpl.java:909)
    at groovy.lang.Closure.call(Closure.java:411)
    at groovy.lang.Closure.call(Closure.java:427)
    at org.codehaus.groovy.runtime.DefaultGroovyMethods.each(DefaultGroovyMethods.java:1325)
    at org.codehaus.groovy.runtime.DefaultGroovyMethods.each(DefaultGroovyMethods.java:1297)
    at org.codehaus.groovy.runtime.dgm$148.invoke(Unknown Source)
    at org.codehaus.groovy.runtime.callsite.PojoMetaMethodSite$PojoMetaMethodSiteNoUnwrapNoCoerce.invoke(PojoMetaMethodSite.java:271)
    at org.codehaus.groovy.runtime.callsite.PojoMetaMethodSite.call(PojoMetaMethodSite.java:53)
    at org.codehaus.groovy.runtime.callsite.CallSiteArray.defaultCall(CallSiteArray.java:45)
    at org.codehaus.groovy.runtime.callsite.AbstractCallSite.call(AbstractCallSite.java:108)
    at org.codehaus.groovy.runtime.callsite.AbstractCallSite.call(AbstractCallSite.java:116)
    at Script10.run(Script10.groovy:5)
    at com.eviware.soapui.support.scripting.groovy.SoapUIGroovyScriptEngine.run(SoapUIGroovyScriptEngine.java:90)
    at com.eviware.soapui.impl.wsdl.teststeps.WsdlGroovyScriptTestStep.run(WsdlGroovyScriptTestStep.java:141)
    at com.eviware.soapui.impl.wsdl.panels.teststeps.GroovyScriptStepDesktopPanel$RunAction$1.run(GroovyScriptStepDesktopPanel.java:250)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
    at java.lang.Thread.run(Unknown Source)

I'm badly stuck with the above issue, quick help is really appreciated!!!! Thank you very much

Possible duplicate of [What is a NullPointerException, and how do I fix it?](https://stackoverflow.com/questions/218384/what-is-a-nullpointerexception-and-how-do-i-fix-it) — M. Prokhorov, Nov 27 '17 at 11:46

score 0 · Accepted Answer · answered Nov 27 '17 at 12:06

Here you go:

Since you are going thru hierarchically, do not require to refer full chain of methods starting from project.
Instead, you could directly access the step objects once you browse to step level. This way, NPE can be avoided.

Here is the fixed script, see the inline relevant comment.

import com.eviware.soapui.impl.wsdl.teststeps.assertions.basic.XPathContainsAssertion
log.info("Testing Start")
def project = context.testCase.testSuite.project
def suiteName = "ManagePostpayInsurance_1_0"
def stepName = "getInsuranceDetails_FC_004"
project.testSuiteList.each { suite ->
    if(suiteName == suite.name) {
        suite.testCaseList.each { kase ->
            kase.testStepList.each { step ->
                if (stepName == step.name) {
                    //Note the change here, directly getting the object from step object
                    def asserting = step.getAssertionByName("XPath Match")
                    log.info(asserting)
                    if (asserting instanceof XPathContainsAssertion){
                        step.removeAssertion(asserting)
                    }
                    def assertion = step.addAssertion("XPath Match")
                    assertion.path = "declare namespace cor='http://soa.o2.co.uk/coredata_1';\ndeclare namespace man='http://soa.o2.co.uk/managepostpayinsurancedata_1';\ndeclare namespace soapenv='http://schemas.xmlsoap.org/soap/envelope/';\n//man:getInsuranceDetails_1Response"
                    assertion.expectedContent = "hello"            
                }
            }
        }
    }
}
log.info 'Testing Over'

Nullpointer Error in groovy script while trying to add xpath assertion

1 Answers1