tweak gradle file

Author: jvmvik

build.gradle

@@ -3,14 +3,23 @@ plugins {
     id 'java-library'
 }
 
+plugins {
+ id 'maven-publish'
+}
+
 // Package default
 archivesBaseName = 'google-search-results-java'
 version = '2.0.1'
 group = 'serpapi'
 
+// java version 
+sourceCompatibility = 1.8
+targetCompatibility = 1.8
+
 // Load repositories
 repositories {
-    jcenter()
+    // jcenter()
+    mavenCentral()
 }
 
 // compileTestJava {
@@ -26,12 +35,50 @@ dependencies {
 
     // Mockito
     testImplementation 'org.mockito:mockito-core:3.6.28'
+
+    // javadoc markdown support doesn't work with modern java and gradle.
 }
 
+// jar file content
 tasks.named('jar') {
     manifest {
         attributes('Implementation-Title': project.name,
                    'Implementation-Version': project.version)
     }
 }
 
+task sourcesJar(type: Jar, dependsOn: classes) {
+    classifier = 'sources'
+    from sourceSets.main.allSource
+}
+
+task javadocJar(type: Jar, dependsOn: javadoc) {
+    classifier = 'javadoc'
+    from javadoc.destinationDir
+}
+
+artifacts {
+    archives sourcesJar
+    archives javadocJar
+}
+
+// To specify a license in the pom:
+publishing {
+    publications {
+        mavenJava(MavenPublication) {
+            pom {
+                licenses {
+                    license {
+                        name = 'MIT License'
+                        url = 'https://github.com/serpapi/google-search-results-java/blob/master/LICENSE'
+                    }
+                }
+            }
+        }
+    }
+}
+
+wrapper {
+    gradleVersion = "7.3.3"
+    distributionType = Wrapper.DistributionType.ALL
+}

gradle/wrapper/gradle-wrapper.properties

@@ -1,5 +1,5 @@
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-7.3.3-bin.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-7.3.3-all.zip
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists