Mauro Molinari created GROOVY-8975:
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Summary: GroovyCastException on the result of
CliBuilder.parseFromSpec
Key: GROOVY-8975
URL: https://issues.apache.org/jira/browse/GROOVY-8975
Project: Groovy
Issue Type: Bug
Components: groovy-runtime
Affects Versions: 2.5.5
Reporter: Mauro Molinari
I'm trying to follow the tutorial about the use of CliBuilder in Groovy with
Groovy 2.5.5. Copying the code at [Annotating methods of an
interface|https://github.com/remkop/picocli/wiki/Groovy-2.5-CliBuilder-Renewal#annotating-methods-of-an-interface]
paragraph, at runtime I have the following Exception:
{noformat}
Exception in thread "main"
org.codehaus.groovy.runtime.typehandling.GroovyCastException: Cannot cast
object
'{help=groovy.cli.picocli.CliBuilder$_extractAttributesFromMethod_closure12@3bb9a3ff}'
with class 'java.util.LinkedHashMap' to class 'mypackage.IHello' due to:
groovy.lang.GroovyRuntimeException: Could not find matching constructor for:
mypackage.IHello(LinkedHashMap)
at
org.codehaus.groovy.runtime.typehandling.DefaultTypeTransformation.continueCastOnSAM(DefaultTypeTransformation.java:412)
at
org.codehaus.groovy.runtime.typehandling.DefaultTypeTransformation.continueCastOnNumber(DefaultTypeTransformation.java:328)
at
org.codehaus.groovy.runtime.typehandling.DefaultTypeTransformation.castToType(DefaultTypeTransformation.java:242)
at
org.codehaus.groovy.runtime.ScriptBytecodeAdapter.castToType(ScriptBytecodeAdapter.java:617)
at mypackage.MyMain.main(MyMain.groovy:20)Exception in thread "main"
org.codehaus.groovy.runtime.typehandling.GroovyCastException: Cannot cast
object
'{help=groovy.cli.picocli.CliBuilder$_extractAttributesFromMethod_closure12@3bb9a3ff}'
with class 'java.util.LinkedHashMap' to class 'mypackage.IHello' due to:
groovy.lang.GroovyRuntimeException: Could not find matching constructor for:
mypackage.IHello(LinkedHashMap)
at
org.codehaus.groovy.runtime.typehandling.DefaultTypeTransformation.continueCastOnSAM(DefaultTypeTransformation.java:412)
at
org.codehaus.groovy.runtime.typehandling.DefaultTypeTransformation.continueCastOnNumber(DefaultTypeTransformation.java:328)
at
org.codehaus.groovy.runtime.typehandling.DefaultTypeTransformation.castToType(DefaultTypeTransformation.java:242)
at
org.codehaus.groovy.runtime.ScriptBytecodeAdapter.castToType(ScriptBytecodeAdapter.java:617)
at mypackage.MyMain.main(DcsServizi2Sdi.groovy:20){noformat}
The exception occurs at this line:
{{IHello hello = cli.parseFromSpec(IHello, argz)}}
The exception goes away (and all works fine) if I replace it with:
{{def hello = cli.parseFromSpec(IHello, argz)}}
I tried to downgrade Groovy down to version 2.5.0 and I always get the
exception. So this really puzzles me, since the mentioned tutorial is quite
simple and straight to follow...
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