diff --git a/build.gradle b/build.gradle
index facdca6..6e1e202 100644
--- a/build.gradle
+++ b/build.gradle
@@ -26,10 +26,19 @@ def getDevelopmentVersion() {
 
 
 def releaseVersion = System.env.RELEASE_VERSION
+
 version = releaseVersion ? releaseVersion : getDevelopmentVersion()
 println "Building version = " + version
 group = 'com.graphql-java'
 
+// check if build for Jakarta EE 9
+def isJakarta = hasProperty("jakarta") ? true : false
+println "Build for Jakarta EE 9? $isJakarta"
+
+if (isJakarta) {
+    apply from: "jakarta.gradle"
+}
+
 sourceCompatibility = 1.8
 targetCompatibility = 1.8
 
@@ -38,12 +47,14 @@ repositories {
     mavenLocal()
 }
 
+def versionHibernateValidator = isJakarta ? "7.0.1.Final" : "6.2.0.Final"
+def versionJakartaEL = isJakarta ? "4.0.1" : "3.0.4"
 
 dependencies {
     compile "com.graphql-java:graphql-java:17.0"
     compile "com.graphql-java:graphql-java-extended-scalars:17.0"
-    compile "org.hibernate.validator:hibernate-validator:7.0.1.Final"
-    compile "org.glassfish:jakarta.el:4.0.0"
+    compile "org.hibernate.validator:hibernate-validator:$versionHibernateValidator"
+    compile "org.glassfish:jakarta.el:$versionJakartaEL"
 
     testCompile 'org.slf4j:slf4j-simple:1.7.31'
     testCompile 'org.spockframework:spock-core:1.3-groovy-2.5'
@@ -60,6 +71,11 @@ task javadocJar(type: Jar, dependsOn: javadoc) {
     from javadoc.destinationDir
 }
 
+jar {
+    // add jakarta classier for Jakarta EE 9
+    archiveClassifier = isJakarta ? "jakarta" : ""
+}
+
 artifacts {
     archives sourcesJar
     archives javadocJar
@@ -76,7 +92,8 @@ publishing {
         maven(MavenPublication) {
             from components.java
             groupId group
-            artifactId 'graphql-java-extended-validation'
+            // use the project name
+            artifactId "graphql-java-extended-validation"
             version version
 
             artifact sourcesJar
@@ -85,7 +102,7 @@ publishing {
             pom.withXml {
                 asNode().children().last() + {
                     resolveStrategy = Closure.DELEGATE_FIRST
-                    name 'graphql-java-extended-validation'
+                    name "graphql-java-extended-validation"
                     description 'A library fo extended validation for graphql-java'
                     url 'https://github.com/graphql-java/graphql-java-extended-validation'
                     inceptionYear '2019'
diff --git a/jakarta.gradle b/jakarta.gradle
new file mode 100644
index 0000000..fa8c764
--- /dev/null
+++ b/jakarta.gradle
@@ -0,0 +1,39 @@
+def generatedSrc = "$buildDir/generated-src";
+def generatedTestSrc = "$buildDir/generated-testSrc";
+def generatedGroovyTestSrc = "$buildDir/generated-testGroovySrc";
+
+task generateSources() {
+    println "[jakarta build] replacing `javax.` with new `jakarta.`"
+    dependsOn("copyJavaSources", "copyTestJavaSources", "copyTestGroovySources")
+}
+
+task copyTestGroovySources(type: Copy) {
+    into generatedGroovyTestSrc
+    from 'src/test/groovy'
+    filter { line -> line.replaceAll("javax\\.", "jakarta\\.") }
+}
+
+task copyTestJavaSources(type: Copy) {
+    into generatedTestSrc
+    from 'src/test/java'
+    filter { line -> line.replaceAll("javax\\.", "jakarta\\.") }
+}
+
+task copyJavaSources(type: Copy) {
+    into generatedSrc
+    from 'src/main/java'
+    filter { line -> line.replaceAll("javax\\.", "jakarta\\.") }
+}
+
+println "[jakarta build] set generated source codes as sourceSets"
+sourceSets {
+    main {
+        java.srcDirs = [generatedSrc]
+        resources.srcDirs = ["src/main/resources"]
+    }
+    test {
+        java.srcDirs = [generatedTestSrc]
+        groovy.srcDirs = [generatedGroovyTestSrc]
+    }
+}
+compileJava.dependsOn("generateSources")
diff --git a/src/main/java/graphql/validation/el/BetterMapELResolver.java b/src/main/java/graphql/validation/el/BetterMapELResolver.java
index 59d6b88..e51f533 100644
--- a/src/main/java/graphql/validation/el/BetterMapELResolver.java
+++ b/src/main/java/graphql/validation/el/BetterMapELResolver.java
@@ -1,8 +1,8 @@
 package graphql.validation.el;
 
 import graphql.Internal;
-import jakarta.el.ELContext;
-import jakarta.el.MapELResolver;
+import javax.el.ELContext;
+import javax.el.MapELResolver;
 
 import java.util.Arrays;
 import java.util.List;
diff --git a/src/main/java/graphql/validation/el/ELSupport.java b/src/main/java/graphql/validation/el/ELSupport.java
index 1571bae..ea97d35 100644
--- a/src/main/java/graphql/validation/el/ELSupport.java
+++ b/src/main/java/graphql/validation/el/ELSupport.java
@@ -1,11 +1,11 @@
 package graphql.validation.el;
 
 import graphql.Internal;
-import jakarta.el.ELContext;
-import jakarta.el.ELManager;
-import jakarta.el.ExpressionFactory;
-import jakarta.el.StandardELContext;
-import jakarta.el.ValueExpression;
+import javax.el.ELContext;
+import javax.el.ELManager;
+import javax.el.ExpressionFactory;
+import javax.el.StandardELContext;
+import javax.el.ValueExpression;
 import java.lang.reflect.Method;
 import java.util.Locale;
 import java.util.Map;
diff --git a/src/main/java/graphql/validation/interpolation/ResourceBundleMessageInterpolator.java b/src/main/java/graphql/validation/interpolation/ResourceBundleMessageInterpolator.java
index 0896a8b..d97930f 100644
--- a/src/main/java/graphql/validation/interpolation/ResourceBundleMessageInterpolator.java
+++ b/src/main/java/graphql/validation/interpolation/ResourceBundleMessageInterpolator.java
@@ -15,9 +15,9 @@
 import java.util.MissingResourceException;
 import java.util.Optional;
 import java.util.ResourceBundle;
-import jakarta.validation.Constraint;
-import jakarta.validation.Path;
-import jakarta.validation.Payload;
+import javax.validation.Constraint;
+import javax.validation.Path;
+import javax.validation.Payload;
 import org.hibernate.validator.internal.engine.MessageInterpolatorContext;
 import org.hibernate.validator.internal.metadata.core.ConstraintHelper;
 import org.hibernate.validator.internal.metadata.descriptor.ConstraintDescriptorImpl;
diff --git a/src/test/groovy/ELDiscover.java b/src/test/groovy/ELDiscover.java
index e09e511..b5bedf0 100644
--- a/src/test/groovy/ELDiscover.java
+++ b/src/test/groovy/ELDiscover.java
@@ -1,11 +1,11 @@
-import jakarta.el.ELContext;
-import jakarta.el.ELManager;
-import jakarta.el.ExpressionFactory;
-import jakarta.el.StandardELContext;
-import jakarta.el.ValueExpression;
-import jakarta.validation.MessageInterpolator;
-import jakarta.validation.constraints.Email;
-import jakarta.validation.constraints.NotNull;
+import javax.el.ELContext;
+import javax.el.ELManager;
+import javax.el.ExpressionFactory;
+import javax.el.StandardELContext;
+import javax.el.ValueExpression;
+import javax.validation.MessageInterpolator;
+import javax.validation.constraints.Email;
+import javax.validation.constraints.NotNull;
 import org.hibernate.validator.constraints.Range;
 import org.hibernate.validator.internal.engine.MessageInterpolatorContext;
 import org.hibernate.validator.internal.engine.path.PathImpl;