Field/Method Annotation searching by Meta-annontation

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Ronald R. DiFrango

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Mar 27, 2017, 12:31:14 PM3/27/17
to FastClasspathScanner-Users
First off thanks for a great tool, I discovered as I was searching for an alternative to org.reflections.

Now, the one case I found a gap in how we use it, is that the method level search doesn't support the ability to search for a meta-annotations like the class level one does.  Any there any plans to support this?

Luke Hutchison

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Mar 27, 2017, 3:08:08 PM3/27/17
to Ronald R. DiFrango, FastClasspathScanner-Users
Hi Ronald, 

Your welcome, I'm glad it (mostly so far!) works for you.

If I understand your question, then yes, there are variants of the annotation scanning methods with "Direct" in their name, and they only look at direct annotations, not direct annotations and meta-annotations (let me know if that's what you were looking for). However, this is currently only supported for scanning Mechanisms 2 and 3. I didn't think about the fact that this might be needed for MatchProcessors too. I could add that. 

However, I'm curious, why do you want to exclude meta-annotations?

Best, 
Luke


On Mar 27, 2017 9:31 AM, "Ronald R. DiFrango" <ron.di...@gmail.com> wrote:
First off thanks for a great tool, I discovered as I was searching for an alternative to org.reflections.

Now, the one case I found a gap in how we use it, is that the method level search doesn't support the ability to search for a meta-annotations like the class level one does.  Any there any plans to support this?

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Luke Hutchison

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Mar 27, 2017, 3:09:33 PM3/27/17
to Ronald R. DiFrango, FastClasspathScanner-Users
Egregious autocorrect typo: You're welcome, not Your welcome, I didn't look up as I told this in my phone :) 

On Mar 27, 2017 12:08 PM, "Luke Hutchison" <luke....@gmail.com> wrote:
Hi Ronald, 

Your welcome, I'm glad it (mostly so far!) works for you.

If I understand your question, then yes, there are variants of the annotation scanning methods with "Direct" in their name, and they only look at direct annotations, not direct annotations and meta-annotations (let me know if that's what you were looking for). However, this is currently only supported for scanning Mechanisms 2 and 3. I didn't think about the fact that this might be needed for MatchProcessors too. I could add that. 

However, I'm curious, why do you want to exclude meta-annotations?

Best, 
Luke

On Mar 27, 2017 9:31 AM, "Ronald R. DiFrango" <ron.di...@gmail.com> wrote:
First off thanks for a great tool, I discovered as I was searching for an alternative to org.reflections.

Now, the one case I found a gap in how we use it, is that the method level search doesn't support the ability to search for a meta-annotations like the class level one does.  Any there any plans to support this?

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Ronald R. DiFrango

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Mar 27, 2017, 3:47:41 PM3/27/17
to FastClasspathScanner-Users
So I'm doing it this way:

//
// Scanning
//
ScanResult result = new FastClasspathScanner("com.test")
        .enableMethodAnnotationIndexing()
        .ignoreFieldVisibility()
        .ignoreMethodVisibility()
        .scan();

// This works for classes
//
// Namely: MyFeatureBean gets found.
//
List<Class<?>> featureClasses = result.classNamesToClassRefs(
                result.getNamesOfClassesWithAnnotationsAnyOf(MyFeature.class), true);


// This doesn't work on the method
//
// Namely: TestFeatureUsingMetaAnnotations. featureBean
//

List<Class<?>> featureBeans = result.classNamesToClassRefs(
                result.getNamesOfClassesWithMethodAnnotation(MyFeature.class), true);
                
Where:

    @Target(ElementType.TYPE)
    @Retention(RetentionPolicy.RUNTIME)
    @Configuration
    @MyFeature("FeatureConfigurationUsingMetaAnnotation")
    private @interface MyFeatureConfiguration {
    }

    @Target(ElementType.METHOD)
    @Retention(RetentionPolicy.RUNTIME)
    @Bean
    @MyFeature("FeatureConfigurationUsingMetaAnnotation.featureBean")
    private @interface MyFeatureBean {
    }

    @MyFeatureConfiguration
    private static class TestFeatureUsingMetaAnnotations {
        @MyFeatureBean
        public void featureBean() {
        }
    }

On Monday, March 27, 2017 at 3:09:33 PM UTC-4, Luke Hutchison wrote:
Egregious autocorrect typo: You're welcome, not Your welcome, I didn't look up as I told this in my phone :) 
On Mar 27, 2017 12:08 PM, "Luke Hutchison" <luke....@gmail.com> wrote:
Hi Ronald, 

Your welcome, I'm glad it (mostly so far!) works for you.

If I understand your question, then yes, there are variants of the annotation scanning methods with "Direct" in their name, and they only look at direct annotations, not direct annotations and meta-annotations (let me know if that's what you were looking for). However, this is currently only supported for scanning Mechanisms 2 and 3. I didn't think about the fact that this might be needed for MatchProcessors too. I could add that. 

However, I'm curious, why do you want to exclude meta-annotations?

Best, 
Luke

On Mar 27, 2017 9:31 AM, "Ronald R. DiFrango" <ron.di...@gmail.com> wrote:
First off thanks for a great tool, I discovered as I was searching for an alternative to org.reflections.

Now, the one case I found a gap in how we use it, is that the method level search doesn't support the ability to search for a meta-annotations like the class level one does.  Any there any plans to support this?

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Luke Hutchison

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Mar 27, 2017, 5:08:23 PM3/27/17
to Ronald R. DiFrango, FastClasspathScanner-Users
Sorry, I misunderstood your original question. Good catch. I added scanning for meta-annotations of fields and methods to the master version, please test and let me know if it works for you. Thanks!



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Ronald R. DiFrango

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Mar 27, 2017, 10:41:39 PM3/27/17
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I cloned the repo and downloaded it locally to build, but I'm getting a random complier failure with no real output.  I'm wonder if its the following directive and something I'm missing:


${testCompileJdkPath}/bin/javac

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Luke Hutchison

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Mar 27, 2017, 10:43:26 PM3/27/17
to Ronald R. DiFrango, FastClasspathScanner-Users
What's the complete compilation error you're getting?


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Ronald R. DiFrango

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Mar 27, 2017, 10:49:45 PM3/27/17
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so I skipped tests and I just noticed this:


[DEBUG] Generating signature for /Users/vcq554/Documents/workspaces/lukehutch/fast-classpath-scanner/target/fast-classpath-scanner-2.0.19-SNAPSHOT.jar

/bin/sh: gpg: command not found


and then the failure:


[ERROR] Failed to execute goal org.apache.maven.plugins:maven-gpg-plugin:1.5:sign (sign-artifacts) on project fast-classpath-scanner: Exit code: 127 -> [Help 1]

org.apache.maven.lifecycle.LifecycleExecutionException: Failed to execute goal org.apache.maven.plugins:maven-gpg-plugin:1.5:sign (sign-artifacts) on project fast-classpath-scanner: Exit code: 127

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Ronald R. DiFrango

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Mar 27, 2017, 10:54:29 PM3/27/17
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so I installed gpg via brew and now its:

gpg: directory `/Users/rdifrango/.gnupg' created

gpg: new configuration file `/Users/rdifrango/.gnupg/gpg.conf' created

gpg: WARNING: options in `/Users/rdifrango/.gnupg/gpg.conf' are not yet active during this run

gpg: keyring `/Users/rdifrango/.gnupg/secring.gpg' created

gpg: keyring `/Users/rdifrango/.gnupg/pubring.gpg' created

gpg: no default secret key: No secret key

gpg: signing failed: No secret key

Luke Hutchison

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Mar 27, 2017, 11:36:44 PM3/27/17
to Ronald R. DiFrango, FastClasspathScanner-Users
Which maven rule are you triggering? The one you want is "package". Also note that Maven doesn't work right unless JAVA_HOME is set to point to the JRE root. You can also do "-Dmaven.test.skip=true" to skip the tests. Putting it all together:

JAVA_HOME=/usr/java/default mvn -Dmaven.test.skip=true package

I just tested this in a clean account, and it works for me. Please let me know if that works for you too.

I'll update the docs with the above info.


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Luke Hutchison

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Mar 27, 2017, 11:45:04 PM3/27/17
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In other words, the complete compilation steps are:

git clone https://github.com/lukehutch/fast-classpath-scanner.git
cd fast-classpath-scanner
export JAVA_HOME=/usr/java/default      # Or similar
mvn -Dmaven.test.skip=true package

Then the compiled package will be in the "target" directory.



Ronald R. DiFrango

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Mar 28, 2017, 9:00:44 AM3/28/17
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That worked

mvn -Dmaven.test.skip=true package

I was trying:

mvn -Dmaven.test.skip=true install

now, the trick is that I'm going to have to manually install it into my MV2 repo so I can test.
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Luke Hutchison

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Mar 28, 2017, 9:15:24 AM3/28/17
to Ronald R. DiFrango, FastClasspathScanner-Users
Yeah, Maven makes even simple things like adding a single local jar to your project immensely difficult. 
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