[jira] [Assigned] (GROOVY-10009) TracingInterceptor throws NullPointerException if arguments contains a null argument

["Eric Milles (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/GROOVY-10009?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Eric Milles reassigned GROOVY-10009:
------------------------------------

    Assignee: Eric Milles

> TracingInterceptor throws NullPointerException if arguments contains a null argument
> ------------------------------------------------------------------------------------
>
>                 Key: GROOVY-10009
>                 URL: https://issues.apache.org/jira/browse/GROOVY-10009
>             Project: Groovy
>          Issue Type: Bug
>          Components: groovy-jdk
>    Affects Versions: 3.0.5, 3.0.6
>         Environment: Windows 10 Pro
>            Reporter: John Yin
>            Assignee: Eric Milles
>            Priority: Major
>
> If a method is called with an argument having null value, beforeInvoke throws a NullPointerException.  Here is an example:
> {quote}class Foo {
>    String say(String s) {
>      return s
>    }
> }
> Foo foo = new Foo()
> def tracer = new TracingInterceptor()
> def proxyMetaClass = ProxyMetaClass.getInstance(Foo.class)
> proxyMetaClass.interceptor = tracer
> foo.metaClass = proxyMetaClass
> def s
> foo.say(s)
> {quote}
> This will cause a crash because s is null.  I believe inside writeInfo() method of TracingInterceptor, it has something like argument.getClass(). 
> In the example above, if we change foo.say(s) to foo.say(s as String) it would pass the beforeInvoke but still fails afterward.  If we actual set s to a non-null value, e.g.
> def s = 'Hello'
> the trace would work.



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