java.lang.NoSuchMethodError: after adding constructor in a class

Question

Could someone please help me understand why after adding a new constructor to a class which takes two parameters, the project compiles but my test now cannot create a new instance of this class?

I get this exception:

java.lang.NoSuchMethodError: pidac.workflow.TestClass.(Lcom/pidac/infrastructure/core/service/CrudService;Lcom/pidac/infrastructure/core/service/AuditService;)V

at pidac.workflow.SomeTests.shouldAuditCompletedIdentityRequestItemsAgainstConnectedSources(SomeClass.java:115) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:498) at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:50) at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12) at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:47) at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17) at org.junit.internal.runners.statements.RunBefores.evaluate(RunBefores.java:26) at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:325) at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:78) at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:57) at org.junit.runners.ParentRunner$3.run(ParentRunner.java:290) at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:71) at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:288) at org.junit.runners.ParentRunner.access$000(ParentRunner.java:58) at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:268) at org.junit.runners.ParentRunner.run(ParentRunner.java:363) at org.junit.runner.JUnitCore.run(JUnitCore.java:137) at com.intellij.junit4.JUnit4IdeaTestRunner.startRunnerWithArgs(JUnit4IdeaTestRunner.java:68) at com.intellij.rt.execution.junit.IdeaTestRunner$Repeater.startRunnerWithArgs(IdeaTestRunner.java:47) at com.intellij.rt.execution.junit.JUnitStarter.prepareStreamsAndStart(JUnitStarter.java:242) at com.intellij.rt.execution.junit.JUnitStarter.main(JUnitStarter.java:70)

I am using IntelliJ 2018 professional.

More Info Dec 29: I have deleted the maven local snapshot for this project and rebuilt.

When I debug the test, I can see that the class has this new constructor. However, there is obviously a mismatch between what the debugger is executing and what I see in IntelliJ.

Answer 1

NoSuchMethodError occurs when a method that was present at compile time is no longer present at runtime.

Your compiled class files are out of date. Rebuild your project.

Answer 2

I had to manually delete the gradle output folder currently configured in [module]/out/production/classes.

My project has this folder configured for output so when I looked at the compiled classes in there, the new changes were not reflected. So I figured this compiled classes were not being updated and just deleted them.

Re-assembled the project and my tests are now able to see the changes even though I do not see the compiled classes in the location above....

Answer 3

Your class loses its default constructor (no args) when you declare one with 2 args. The test you are writing probably expects a default constructor to get an instance.

Build another explicit no-args constructor or if you're using the excellent Lombok library, annotate the class with @NoArgsConstructor to get your tests working. Alternatively, change your test to initialize the class with 2 attributes in the constructor.

As mentioned by Nicholas, a code sample from you will help.

Default constructor is explained in another SO question here: Java default constructor