Gson

Try it in 3 steps

1. 1

   Create a minimal Maven project for Gson 2.14.0

   Pin Gson to 2.14.0 in an isolated Maven project. Gson supports Java 8+, while this sample compiles with Java 17.

   mkdir -p gson-demo/src/main/java/demo && printf '%s\n' '<project xmlns="http://maven.apache.org/POM/4.0.0">' '<modelVersion>4.0.0</modelVersion>' '<groupId>demo</groupId><artifactId>gson-demo</artifactId><version>1.0.0</version>' '<properties><maven.compiler.release>17</maven.compiler.release></properties>' '<dependencies><dependency><groupId>com.google.code.gson</groupId><artifactId>gson</artifactId><version>2.14.0</version></dependency></dependencies>' '</project>' > gson-demo/pom.xmlCopy
2. 2

   Create a small object-to-JSON example

   Use a plain Java class with no Gson annotations and serialize it with toJson.

   printf '%s\n' 'package demo;' 'import com.google.gson.Gson;' 'public class Main {' ' static class User { String name = "Ada"; int id = 42; }' ' public static void main(String[] args) { System.out.println(new Gson().toJson(new User())); }' '}' > gson-demo/src/main/java/demo/Main.javaCopy
3. 3

   Compile and verify the JSON output

   Resolve Gson 2.14.0, compile the project, and confirm that the Java object is serialized to JSON.

   cd gson-demo && mvn -q compile dependency:build-classpath -Dmdep.outputFile=cp.txt && java -cp "target/classes:$(cat cp.txt)" demo.MainCopy

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• Java

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