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[Backport 7.17] Add docs about Spring and jakarta-json #219

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Mar 28, 2022
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[Backport 7.17] Add docs about Spring and jakarta-json #219

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33 changes: 31 additions & 2 deletions docs/installation.asciidoc
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Original file line number Diff line number Diff line change
Expand Up @@ -26,8 +26,13 @@ available at https://snapshots.elastic.co/maven/.
dependencies {
implementation 'co.elastic.clients:elasticsearch-java:{version}'
implementation 'com.fasterxml.jackson.core:jackson-databind:2.12.3'

// Needed only if you use the spring-dependency-management
// and spring-boot Gradle plugins
implementation 'jakarta.json:jakarta.json-api:2.0.1' //<1>
}
--------------------------------------------------
<1> See <<spring-jakarta-json>> for additional details.

[discrete]
[[maven]]
Expand All @@ -39,19 +44,43 @@ dependencies:
["source","xml",subs="attributes+"]
--------------------------------------------------
<project>

<dependencies>

<dependency>
<groupId>co.elastic.clients</groupId>
<artifactId>elasticsearch-java</artifactId>
<version>{version}</version>
</dependency>

<dependency>
<groupId>com.fasterxml.jackson.core</groupId>
<artifactId>jackson-databind</artifactId>
<version>2.12.3</version>
</dependency>
</dependencies>

<!-- Needed only if you use the spring-boot Maven plugin -->
<dependency> <!--1-->
<groupId>jakarta.json</groupId>
<artifactId>jakarta.json-api</artifactId>
<version>2.0.1</version>
</dependency>

</dependencies>
</project>
--------------------------------------------------
<1> See <<spring-jakarta-json>> for additional details.


[discrete]
[[spring-jakarta-json]]
=== Spring Boot and jakarta.json

Spring Boot comes with Gradle and Maven plugins to ease development and dependency management. These plugins define built-in versions for a number of well-known libraries.

One these libraries is `jakarta.json:json-api` that defines the standard Java JSON API. In version `1.x` this library used the `javax.json` package, while in version `2.x` it uses the `jakarta.json` package after https://blogs.oracle.com/javamagazine/post/transition-from-java-ee-to-jakarta-ee[the transition from JavaEE to JakartaEE].

The {java-client} depends on version `2.0.1` of this library, in order to use the newer and future-proof `jakarta.json` package. But Spring Boot's Gradle plugin (at least in version `2.6` and below) overrides the {java-client}'s dependency to use version `1.1.6` in the older `javax.json` namespace.

This is why you have to explicitly add the `jakarta.json:jakarta.json-api:2.0.1` dependency. Otherwise, this will result in the following exception at runtime: `java.lang.ClassNotFoundException: jakarta.json.spi.JsonProvider`.

If your application also requires `javax.json` you can add the `javax.json:javax.json-api:1.1.4` dependency, which is equivalent to `jakarta.json:jakarta.json-api:1.1.6`.