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//// | ||
This document is maintained in the main Quarkus repository | ||
and pull requests should be submitted there: | ||
https://github.com/quarkusio/quarkus/tree/main/docs/src/main/asciidoc | ||
//// | ||
[id="extensions-faq"] | ||
= Frequently asked questions about writing extensions | ||
include::_attributes.adoc[] | ||
:diataxis-type: howto | ||
:categories: extensions | ||
//// | ||
:extension-status: preview | ||
TODO: uncomment the above for experimental or tech-preview content. | ||
The document header ends at the first blank line. Do not remove the blank line between the header and the abstract summary. | ||
//// | ||
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## Should you write an extension? | ||
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### Why would I want to write an extension? | ||
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See the xref:writing-extensions#extension-philosophy[extension philosophy]. | ||
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One useful thing extensions can do is bundle other extensions. | ||
Have a look at the link:https://quarkus.io/extensions/io.quarkiverse.microprofile/quarkus-microprofile/[Quarkus MicroProfile extension] for an example of aggregator extensions. | ||
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### Are there cases an extension isn't necessary? | ||
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Not every problem needs an extension! | ||
If you're just bundling up external libraries (that aren't already extensions) and making minor adjustments, you might not need an extension. | ||
For example, plain libraries can create new configuration elements and register classes with Jandex (this link:https://www.loicmathieu.fr/wordpress/en/informatique/quarkus-tip-comment-ne-pas-creer-une-extension-quarkus/[blog shows how]). | ||
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## Bytecode transformation | ||
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### How can I change the code of things on the classpath? | ||
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A `BytecodeTransformerBuildItem` can be used to manipulate bytecode. | ||
For example, see this link:https://quarkus.io/blog/solving-problems-with-extensions/[blog about removed problematic bridge methods from a dependency]. | ||
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## CDI | ||
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### I'm working with CDI, and I don't know how to ... | ||
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The xref:cdi-integration.adoc[CDI integration guide] presents solutions to a number of CDI-related use cases for extension authors. | ||
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### I have transformed a user class to add an injected field, but CDI isn't working | ||
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What happens if an extension transforms a user class using `BytecodeTransformerBuildItem`, and replaces `@jakarta.annotation.Resource` with `@jakarta.inject.Inject`? The field will not be injected by Arc. | ||
Debugging will show the transformed class being loaded in the app, but it looks like Arc doesn't see the new code. | ||
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Arc-related transformations should generally be done with link:https://github.com/quarkusio/quarkus/blob/main/extensions/arc/deployment/src/main/java/io/quarkus/arc/deployment/AnnotationsTransformerBuildItem.java[AnnotationsTransformerBuildItem]. | ||
The reason is that _all_ Quarkus's bytecode transformations are done after Jandex indexing. This means changes are never reflected back in Jandex. | ||
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Most extensions use Jandex as a source of truth to find out what to do. Those extensions won't see new/modified endpoints in the bytecode itself. | ||
The solution to this limitation is annotation transformers. You should also be aware that while Arc and Quarkus REST honour annotation transformers, not all extensions do. | ||
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### Something in my classpath has @Inject annotations, which are confusing CDI. How can I fix that? | ||
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You will need to implement an `AnnotationsTransformer` and strip out out the problematic injection sites. (Remember, if the use case involves CDI, it needs to be an `AnnotationsTransformer`, not a BytecodeTransformer`.) See link:https://quarkus.io/blog/solving-problems-with-extensions-2/[this blog] about on using an `AnnotationsTransformer` extension to clean non `@Inject` annotations from the Airline library so that it can be used in CDI-enabled runtimes. | ||
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## Cross-cutting concerns | ||
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### How can I redirect application logging to an external service? | ||
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A `LogHandlerBuildItem` is a convenient way to redirect application logs. See this link:https://quarkus.io/blog/quarkus-aws-cloudwatch_extension/[worked example of an extension which directs output to AWS CloudWatch]. | ||
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## Build and hosting infrastructure for extensions | ||
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### Can I use Gradle to build my extension? | ||
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Yes, but it's not the most typical pattern. | ||
See the xref:building-my-first-extension.adoc#gradle-setup[Building Your First Extension Guide] for instructions on setting up a Gradle extension. Have a look at the link:https://quarkus.io/extensions/org.jobrunr/quarkus-jobrunr/[JobRunr extension] for an example implementation. | ||
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### If I want my extension to be in code.quarkus.io, does it have to be in the Quarkiverse GitHub org? | ||
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Registering an extension in the catalog is independent from where the source code is. | ||
The link:https://hub.quarkiverse.io[quarkiverse repository] has some shortcuts to make releasing and testing extensions easier, but any extension can link:https://hub.quarkiverse.io/checklistfornewprojects/#make-your-extension-available-in-the-tooling[register into the catalog]. | ||
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### My extension isn't showing up on extensions.quarkus.io | ||
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Every extension in the link:https://github.com/quarkusio/quarkus-extension-catalog/tree/main/extensions[extension catalog] should appear in http://code.quarkus.io, http://extensions.quarkus.io, and the command line tools. | ||
The web pages at http://extensions.quarkus.io are refreshed a few times a delay, so there may be a delay in new extensions showing up there. | ||
To debug a missing extension, first: | ||
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- Check your extension is present in link:https://central.sonatype.com/[Maven Central] | ||
- Check the extension is included the link:https://github.com/quarkusio/quarkus-extension-catalog/tree/main/extensions[extensions catalog list] (it only needs to be included once, and future versions will be automatically detected) | ||
- Check if the extension is listed in the http://https://registry.quarkus.io/q/swagger-ui/#/Client/get_client_extensions_all[Quarkus registry] list of all known extensions | ||
- Check if there has been a green link:https://github.com/quarkusio/extensions/actions/workflows/build_and_publish.yml[build of the extensions site] since updating the catalog | ||
## Other topics | ||
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### What's the difference between a quickstart and a codestart? | ||
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Both codestarts and quickstarts are designed to help users get coding quickly. | ||
A codestarts is a generated application and a quickstart is browsable source code. | ||
Codestarts allow the creation of customised apps, which makes them quite powerful. |
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31 changes: 31 additions & 0 deletions
31
...ts/gradle/src/main/resources/java-platform-with-eager-resolution-project/build.gradle.kts
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plugins { | ||
java | ||
id("io.quarkus") | ||
} | ||
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repositories { | ||
mavenCentral() | ||
mavenLocal() | ||
} | ||
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dependencies { | ||
implementation("io.quarkus:quarkus-rest") | ||
implementation("io.quarkus:quarkus-arc") | ||
implementation(enforcedPlatform(project(":library"))) | ||
testImplementation("io.quarkus:quarkus-junit5") | ||
testImplementation("io.rest-assured:rest-assured") | ||
} | ||
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group = "org.acme" | ||
version = "1.0.0-SNAPSHOT" | ||
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tasks.withType<Test> { | ||
systemProperty("java.util.logging.manager", "org.jboss.logmanager.LogManager") | ||
} | ||
tasks.withType<JavaCompile> { | ||
options.encoding = "UTF-8" | ||
options.compilerArgs.add("-parameters") | ||
} | ||
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tasks.all{} |
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3
...s/gradle/src/main/resources/java-platform-with-eager-resolution-project/gradle.properties
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quarkusPlatformArtifactId=quarkus-bom | ||
quarkusPlatformGroupId=io.quarkus | ||
kotlinVersion=${kotlin.version} |
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...e/src/main/resources/java-platform-with-eager-resolution-project/library/build.gradle.kts
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plugins { | ||
`java-platform` | ||
} | ||
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val quarkusPlatformGroupId: String by project | ||
val quarkusPlatformArtifactId: String by project | ||
val quarkusPlatformVersion: String by project | ||
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javaPlatform.allowDependencies() | ||
dependencies{ | ||
api(enforcedPlatform("${quarkusPlatformGroupId}:${quarkusPlatformArtifactId}:${quarkusPlatformVersion}")) | ||
constraints{ | ||
api("org.assertj:assertj-core:3.26.3") | ||
} | ||
} |
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...sts/gradle/src/main/resources/java-platform-with-eager-resolution-project/settings.gradle
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pluginManagement { | ||
repositories { | ||
mavenLocal { | ||
content { | ||
includeGroupByRegex 'io.quarkus.*' | ||
includeGroup 'org.hibernate.orm' | ||
} | ||
} | ||
mavenCentral() | ||
gradlePluginPortal() | ||
} | ||
plugins { | ||
id 'io.quarkus' version "${quarkusPluginVersion}" | ||
id 'org.jetbrains.kotlin.jvm' version "${kotlinVersion}" | ||
id 'org.jetbrains.kotlin.plugin.allopen' version "${kotlinVersion}" | ||
} | ||
} | ||
rootProject.name='java-platform-with-eager-resolution-project' | ||
include(":library") |
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.../java-platform-with-eager-resolution-project/src/main/java/org/acme/GreetingResource.java
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package org.acme; | ||
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import jakarta.ws.rs.GET; | ||
import jakarta.ws.rs.Path; | ||
import jakarta.ws.rs.Produces; | ||
import jakarta.ws.rs.core.MediaType; | ||
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@Path("/hello") | ||
public class GreetingResource { | ||
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@GET | ||
@Produces(MediaType.TEXT_PLAIN) | ||
public String hello() { | ||
return "Hello from Quarkus REST"; | ||
} | ||
} |
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...tform-with-eager-resolution-project/src/native-test/java/org/acme/GreetingResourceIT.java
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package org.acme; | ||
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import io.quarkus.test.junit.QuarkusIntegrationTest; | ||
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@QuarkusIntegrationTest | ||
class GreetingResourceIT extends GreetingResourceTest { | ||
// Execute the same tests but in packaged mode. | ||
} |
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...a-platform-with-eager-resolution-project/src/test/java/org/acme/GreetingResourceTest.java
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package org.acme; | ||
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import io.quarkus.test.junit.QuarkusTest; | ||
import org.junit.jupiter.api.Test; | ||
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import static io.restassured.RestAssured.given; | ||
import static org.hamcrest.CoreMatchers.is; | ||
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@QuarkusTest | ||
class GreetingResourceTest { | ||
@Test | ||
void testHelloEndpoint() { | ||
given() | ||
.when().get("/hello") | ||
.then() | ||
.statusCode(200) | ||
.body(is("Hello from Quarkus REST")); | ||
} | ||
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} |
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26
...ion-tests/gradle/src/test/java/io/quarkus/gradle/JavaPlatformWithEagerResolutionTest.java
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package io.quarkus.gradle; | ||
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import static org.assertj.core.api.Assertions.assertThat; | ||
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import java.io.File; | ||
import java.io.IOException; | ||
import java.net.URISyntaxException; | ||
import java.nio.file.Path; | ||
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import org.junit.jupiter.api.Test; | ||
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public class JavaPlatformWithEagerResolutionTest extends QuarkusGradleWrapperTestBase { | ||
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@Test | ||
public void shouldImportConditionalDependency() throws IOException, URISyntaxException, InterruptedException { | ||
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final File projectDir = getProjectDir("java-platform-with-eager-resolution-project"); | ||
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runGradleWrapper(projectDir, "clean", ":quarkusBuild"); | ||
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final File buildDir = new File(projectDir, "build"); | ||
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final Path quarkusOutput = buildDir.toPath().resolve("quarkus-app"); | ||
assertThat(quarkusOutput.resolve("quarkus-run.jar")).exists(); | ||
} | ||
} |