Jenkinsfile Groovy code not allowing me to call class contructor - jenkins

Question

I have a class like this:
class MyClass {
boolean mySetting
String mySetting2
List<String> mySetting3
...etc for another 10...
}
but when I try to call its constructor with what look like valid values, I get a java.lang.IllegalArgumentException with no message.
java.lang.IllegalArgumentException
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.base/java.lang.reflect.Method.invoke(Method.java:566)
at org.codehaus.groovy.reflection.CachedMethod.invoke(CachedMethod.java:93)
at groovy.lang.MetaMethod.doMethodInvoke(MetaMethod.java:325)
at groovy.lang.MetaClassImpl.setProperty(MetaClassImpl.java:2725)
at groovy.lang.MetaClassImpl.setProperty(MetaClassImpl.java:3770)
at groovy.lang.MetaClassImpl.setProperties(MetaClassImpl.java:1747)
at org.codehaus.groovy.runtime.callsite.ConstructorSite$NoParamSite.callConstructor(ConstructorSite.java:125)
at org.codehaus.groovy.runtime.callsite.CallSiteArray.defaultCallConstructor(CallSiteArray.java:60)
at org.codehaus.groovy.runtime.callsite.AbstractCallSite.callConstructor(AbstractCallSite.java:235)
at org.kohsuke.groovy.sandbox.impl.Checker$3.call(Checker.java:208)
at org.kohsuke.groovy.sandbox.GroovyInterceptor.onNewInstance(GroovyInterceptor.java:42)
at org.jenkinsci.plugins.scriptsecurity.sandbox.groovy.SandboxInterceptor.onNewInstance(SandboxInterceptor.java:173)
at org.kohsuke.groovy.sandbox.impl.Checker$3.call(Checker.java:205)
at org.kohsuke.groovy.sandbox.impl.Checker.checkedConstructor(Checker.java:210)
at com.cloudbees.groovy.cps.sandbox.SandboxInvoker.constructorCall(SandboxInvoker.java:21)
at WorkflowScript.run(WorkflowScript:116)
at ___cps.transform___(Native Method)
I'd like to make it known publically that I hate Groovy and Jenkins could have been a reasonable system without it.

Answer 1

Eventually I changed my code to set all the parameters individually and discovered that one hadn't been set. This had obviously worked in all my PRs because the params object had default values defined already but not in my new branch because it was the first time it was run.
I changed my line to this:
myObj.mySetting = params.setting || false
java.lang.IllegalArgumentException
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.base/java.lang.reflect.Method.invoke(Method.java:566)
at org.codehaus.groovy.reflection.CachedMethod.invoke(CachedMethod.java:93)
at groovy.lang.MetaMethod.doMethodInvoke(MetaMethod.java:325)
at groovy.lang.MetaClassImpl.setProperty(MetaClassImpl.java:2725)
at groovy.lang.MetaClassImpl.setProperty(MetaClassImpl.java:3770)
at ExecutionConfiguration.setProperty(WorkflowScript)
at org.codehaus.groovy.runtime.InvokerHelper.setProperty(InvokerHelper.java:197)
at org.codehaus.groovy.runtime.ScriptBytecodeAdapter.setProperty(ScriptBytecodeAdapter.java:484)
at org.kohsuke.groovy.sandbox.impl.Checker$8.call(Checker.java:412)
at org.kohsuke.groovy.sandbox.GroovyInterceptor.onSetProperty(GroovyInterceptor.java:84)
at org.jenkinsci.plugins.scriptsecurity.sandbox.groovy.SandboxInterceptor.onSetProperty(SandboxInterceptor.java:229)
at org.kohsuke.groovy.sandbox.impl.Checker$8.call(Checker.java:409)
at org.kohsuke.groovy.sandbox.impl.Checker.checkedSetProperty(Checker.java:416)
at com.cloudbees.groovy.cps.sandbox.SandboxInvoker.setProperty(SandboxInvoker.java:33)
at com.cloudbees.groovy.cps.impl.PropertyAccessBlock.rawSet(PropertyAccessBlock.java:24)
at WorkflowScript.run(WorkflowScript:131)
at ___cps.transform___(Native Method)