Upgrade to Java 8 and add GitHub Actions CI

.github/workflows/ci.yml

@@ -0,0 +1,35 @@
+name: CI
+
+on:
+  pull_request:
+    branches: [ master, main ]
+  push:
+    branches: [ master, main ]
+
+jobs:
+  test:
+    name: Run Tests
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v4
+
+      - name: Set up JDK 25
+        uses: actions/setup-java@v4
+        with:
+          java-version: '25'
+          distribution: 'temurin'
+          cache: maven
+
+      - name: Build and Test
+        run: mvn -B verify --file pom.xml
+
+      - name: Upload Test Results
+        if: always()
+        uses: actions/upload-artifact@v4
+        with:
+          name: test-results
+          path: target/surefire-reports/
+          retention-days: 7
+

.java-version

@@ -1 +1 @@
-1.7
+25

pom.xml

@@ -41,10 +41,10 @@
         	<plugin>
                 <groupId>org.apache.maven.plugins</groupId>
                 <artifactId>maven-compiler-plugin</artifactId>
-                <version>3.1</version>
+                <version>3.14.1</version>
                 <configuration>
-                    <source>1.6</source>
-                    <target>1.6</target>
+                    <source>8</source>
+                    <target>8</target>
                 </configuration>
             </plugin>
             <plugin>

src/test/java/io/gsonfire/gson/HooksTest.java

@@ -115,10 +115,10 @@ public void postSerialize(JsonElement result, A src, Gson gson) {
         assertEquals(0, countWhenDeserialize.get());
     }
 
-    private class A{
+    private static class A{
         private int count = 0;
         private transient int nonSerializable = -1;
-        private Gson gson;
+        private transient Gson gson;
 
         private A(int count) {
             this.count = count;
@@ -154,7 +154,7 @@ public Gson getGson() {
         }
     }
 
-    private class B extends A {
+    private static class B extends A {
         public B b;
 
         private B(int count) {