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https://issues.apache.org/jira/browse/GROOVY-7982?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15624500#comment-15624500
]
Paul King commented on GROOVY-7982:
-----------------------------------
Yes, that's a bug. Perhaps close this one and create a fresh one for that. It's
not really anything to do with CompileStatic (though you get a different error
in that case), e.g.
{code}
class Foo {
def bar() {}
}
@groovy.transform.TypeChecked // MME at runtime, the same as dynamic groovy
//@groovy.transform.CompileStatic // would give GroovyCastException at runtime
def method() {
Foo.bar()
}
method()
{code}
> CompileStatic causes GroovyCastException when calling static methods on a
> Java class
> ------------------------------------------------------------------------------------
>
> Key: GROOVY-7982
> URL: https://issues.apache.org/jira/browse/GROOVY-7982
> Project: Groovy
> Issue Type: Bug
> Affects Versions: 2.4.7
> Reporter: Daniel Perano
>
> I have a project with mixed Java and Groovy sources. A Gradle build compiles
> the Java sources with javac and the Groovy sources with groovyc. There is a
> Java class that provides access to a database via static methods. The
> relevant methods in this class are shown below:
> {code:Java|title=Database.java}
> public class Database {
> public boolean alreadyExists(String name){}
> public boolean alreadyExists(UUID id){}
> public void save(DataClass data){}
> }
> {code}
> The Groovy code that causes the GroovyCastException to be thrown is shown
> below:
> {code:Java|title=DBAccess.groovy}
> // name is an instance of java.lang.String
> // data is an instance of DataClass (see Database.java snippet above)
> if(!Database.alreadyExists(name)){
> Database.save(data)
> // ...
> }else{
> // ...
> }
> {code}
> When the Groovy snippet above runs, the call to Database.alreadyExists()
> produces the following stack trace:
> org.codehaus.groovy.runtime.typehandling.GroovyCastException: Cannot cast
> object 'class mypackage.Database' with class 'java.lang.Class' to class
> 'mypackage.Database'
> at
> org.codehaus.groovy.runtime.typehandling.DefaultTypeTransformation.continueCastOnSAM(DefaultTypeTransformation.java:405)
> at
> org.codehaus.groovy.runtime.typehandling.DefaultTypeTransformation.continueCastOnNumber(DefaultTypeTransformation.java:319)
> at
> org.codehaus.groovy.runtime.typehandling.DefaultTypeTransformation.castToType(DefaultTypeTransformation.java:232)
> at
> org.codehaus.groovy.runtime.ScriptBytecodeAdapter.castToType(ScriptBytecodeAdapter.java:603)
> at myotherpackage.DBAccess.doStuff(DBAccess.groovy:56)
> However, if the if statement is removed, the Database.save() method completes
> successfully. Decompiling the DBAccess.class file produces the following:
> {code:Java|title=CompiledDBAccess.java}
> if (!((Database)ScriptBytecodeAdapter.castToType(Database.class,
> Database.class)).alreadyExists(name)) {
> Database.save((DataClass)data);
> //...
> } else {
> //...
> }
> {code}
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