Native Image Support

[driverpt]

Is your feature request related to a problem? Please describe.
Currently we are trying to add this library to a Micronaut GraalVM Application and we're getting errors like:

org.graalvm.compiler.debug.GraalError: com.oracle.graal.pointsto.constraints.UnsupportedFeatureException: No instances of net.logstash.logback.pattern.AbstractJsonPatternParser$LayoutValueGetter are allowed in the image heap as this class should be initialized at image runtime. To see how this object got instantiated use --trace-object-instantiation=net.logstash.logback.pattern.AbstractJsonPatternParser$LayoutValueGetter.

This happens for all Static Classes

Describe the solution you'd like
Is there any way of adding a native-image.properties to make GraalVM Image possible?

Describe alternatives you've considered
Creating a custom serializer

Additional context
Micronaut 3.6.0 with AOT + GraalVM

[brenuart]

Hi Luis,

Your are not the first to report issues using the project with GraalVM. Unfortunately I have no experience at all with GraalVM and I'm a bit puzzled about where to start looking at... I found a quick "howto" on the net and used it to build a sample application hoping I could reproduce your problem. Unfortunately I could not reproduce your problem: I could build and execute my sample app without any problem.

Here is what I tried:

• I wrote a small application with a single "main" that logs a couple of lines
• build it using the org.graalvm.buildtools:native-maven-plugin (version 0.9.13) and the following configuration:

<plugin>
	<groupId>org.graalvm.buildtools</groupId>
	<artifactId>native-maven-plugin</artifactId>
	<version>0.9.13</version>
	<extensions>true</extensions>
	<executions>
		<execution>
			<id>build-native</id>
			<goals>
				<goal>build</goal>
			</goals>
			<phase>package</phase>
		</execution>
	</executions>
	<configuration>
		<mainClass>${mainClass}</mainClass>
		<buildArgs>
			<arg>--allow-incomplete-classpath</arg>
			<arg>--initialize-at-build-time</arg>
			<arg>-H:IncludeResources=.*\.xml$</arg>
		</buildArgs>
	</configuration>
</plugin>

Your error message refers to the AbstractJsonPatternParser so I configured logback to make use of the "pattern" JsonProvider. Here is the encoder I used:

<encoder class="net.logstash.logback.encoder.LoggingEventCompositeJsonEncoder">
    <providers>
        <timestamp/>
        <pattern>
            <pattern>{ "level": "%level", "message": "%message" }</pattern>
        </pattern>
    </providers>
</encoder>

I compiled the application with mvn package and got a working executable in the target folder. I could launch the app without problem and got my logs printed on the console in JSON format as expected.

Since I could not reproduce the problem myself, it would be nice if you could provide one yourself. Also don't hesitate to give me some more insight if you have some ideas about where the problem is and what could be a solution. Thx.

[driverpt]

I will try that. In the meanwhile to reproduce the issue you can just use this pre-configured Micronaut app and add the Encoder (you must add the dependency)

cc @msailes @sdelamo