On Fri, Sep 16, 2022 at 1:37 PM 'Chris Hegarty' via jackson-dev
<jackson-dev@googlegroups.com> wrote:
>
> Hi,
>
> I'm encountering an issue when compiling against the latest Jackson
> 2.14.0-SNAPSHOT. The issue only arises when lint warnings are enabled - it's
> quite common to enable some or all lint warnings and also treat warnings as
> errors (which we do in Elasticsearch).
>
> The issue relates to the use of the
> `aQute.bnd.annotation.spi.ServiceProvider` annotation in `JsonFactory`. I've
> included inline a trivial minimal test that demonstrates the issue, along
> with the warning message.
>
> For now, I'm working around this issue by disabling `classfile` lint
> warnings, with `-Xlint:-classfile`. [1]
>
> ```
> $ cat T.java
> public class T {
> com.fasterxml.jackson.core.JsonFactory jsonFactory = null;
> }
>
> ```
>
> ```
> $ binaries/jdk-17.0.2.jdk/Contents/Home/bin/javac \
> -cp
> .gradle/caches/modules-2/files-2.1/com.fasterxml.jackson.core/jackson-core/2.14.0-SNAPSHOT/3f27917aee3d16732aa59a78ee5104cc7bd24fef/jackson-core-2.14.0-SNAPSHOT.jar
> \
> -Xlint:all \
> T.java
>
> .gradle/caches/modules-2/files-2.1/com.fasterxml.jackson.core/jackson-core/2.14.0-SNAPSHOT/3f27917aee3d16732aa59a78ee5104cc7bd24fef/jackson-core-2.14.0-SNAPSHOT.jar(/com/fasterxml/jackson/core/JsonFactory.class):
> warning: Cannot find annotation method 'value()' in type 'ServiceProvider':
> class file for aQute.bnd.annotation.spi.ServiceProvider not found
> 1 warning
> ```
>
> Thanks,
> -Chris.
>
> [1] https://github.com/elastic/elasticsearch/pull/88057
Ok, so this annotation was added for better OSGi support as per:
https://github.com/FasterXML/jackson-core/issues/768
but would not want to add a requirement for non-OSGi users to have a
dependency to OSGi annotations.
Is there some actual problem here, or just general concern it might be
problematic? My understanding of Java annotation
handling is that JVM, JDK and class loaders must assume that
annotation definitions may well not be available in many cases.
And so missing should not be considered an error condition.
-+ Tatu +-
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