Support Helidon3 and Helidon4 (precedence) by helidon connector.

connectors/helidon-connector/pom.xml

@@ -91,7 +91,7 @@
         <profile>
             <id>HelidonExclude</id>
             <activation>
-                <jdk>[1.8,17)</jdk>
+                <jdk>[1.8,21)</jdk>
             </activation>
             <build>
                 <directory>${java8.build.outputDirectory}</directory>
@@ -129,9 +129,11 @@
         <profile>
             <id>HelidonInclude</id>
             <activation>
-                <jdk>[17,)</jdk>
+                <jdk>[21,)</jdk>
             </activation>
             <build>
+                <!-- 17 is correct, the module works with Helidon 3 supporting JDK 17, too -->
+                <!-- The build is against Helidon 4, which requires JDK 21 for the build, though -->
                 <directory>${java17.build.outputDirectory}</directory>
                 <plugins>
                     <plugin>

connectors/helidon-connector/src/main/java17/org/glassfish/jersey/helidon/connector/Helidon3ConnectorProvider.java

@@ -0,0 +1,30 @@
+/*
+ * Copyright (c) 2025 Oracle and/or its affiliates. All rights reserved.
+ *
+ * This program and the accompanying materials are made available under the
+ * terms of the Eclipse Public License v. 2.0, which is available at
+ * http://www.eclipse.org/legal/epl-2.0.
+ *
+ * This Source Code may also be made available under the following Secondary
+ * Licenses when the conditions for such availability set forth in the
+ * Eclipse Public License v. 2.0 are satisfied: GNU General Public License,
+ * version 2 with the GNU Classpath Exception, which is available at
+ * https://www.gnu.org/software/classpath/license.html.
+ *
+ * SPDX-License-Identifier: EPL-2.0 OR GPL-2.0 WITH Classpath-exception-2.0
+ */
+
+package org.glassfish.jersey.helidon.connector;
+
+import jakarta.ws.rs.client.Client;
+import jakarta.ws.rs.core.Configuration;
+import org.glassfish.jersey.Beta;
+import org.glassfish.jersey.client.spi.Connector;
+
+@Beta
+class Helidon3ConnectorProvider extends io.helidon.jersey.connector.HelidonConnectorProvider {
+    @Override
+    public Connector getConnector(Client client, Configuration runtimeConfig) {
+        return super.getConnector(client, runtimeConfig);
+    }
+}

connectors/helidon-connector/src/main/java17/org/glassfish/jersey/helidon/connector/HelidonClientProperties.java

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2020, 2022 Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2020, 2025 Oracle and/or its affiliates. All rights reserved.
  *
  * This program and the accompanying materials are made available under the
  * terms of the Eclipse Public License v. 2.0, which is available at
@@ -13,13 +13,16 @@
  *
  * SPDX-License-Identifier: EPL-2.0 OR GPL-2.0 WITH Classpath-exception-2.0
  */
+
 package org.glassfish.jersey.helidon.connector;
 
-import io.helidon.jersey.connector.HelidonProperties;
+import io.helidon.common.tls.Tls;
+import io.helidon.config.Config;
+import io.helidon.webclient.api.WebClient;
 import org.glassfish.jersey.internal.util.PropertiesClass;
 
-import io.helidon.config.Config;
-import io.helidon.webclient.WebClient;
+import java.util.List;
+import java.util.Map;
 
 /**
  * Configuration options specific to the Client API that utilizes {@code HelidonConnectorProvider}.
@@ -28,8 +31,60 @@
 @PropertiesClass
 public final class HelidonClientProperties {
 
+    private HelidonClientProperties() {
+    }
+
+    /**
+     * Property name to set a {@link Config} instance to by used by underlying {@link WebClient}.
+     * This property is settable on {@link jakarta.ws.rs.core.Configurable#property(String, Object)}.
+     *
+     * @see io.helidon.webclient.api.WebClientConfig.Builder#config(io.helidon.common.config.Config)
+     */
+    public static final String CONFIG = "jersey.connector.helidon.config";
+
+    /**
+     * Property name to set a {@link Tls} instance to be used by underlying {@link WebClient}.
+     * This property is settable on {@link jakarta.ws.rs.core.Configurable#property(String, Object)}.
+     *
+     * @see io.helidon.webclient.api.WebClientConfig.Builder#tls(Tls)
+     */
+    public static final String TLS = "jersey.connector.helidon.tls";
+
+    /**
+     * Property name to set a {@code List<? extends  ProtocolConfig>} instance with a list of
+     * protocol configs to be used by underlying {@link WebClient}.
+     * This property is settable on {@link jakarta.ws.rs.core.Configurable#property(String, Object)}.
+     *
+     * @see io.helidon.webclient.api.WebClientConfig.Builder#protocolConfigs(List)
+     */
+    public static final String PROTOCOL_CONFIGS = "jersey.connector.helidon.protocolConfigs";
+
+    /**
+     * Property name to set a {@code Map<String, String>} instance with a list of
+     * default headers to be used by underlying {@link WebClient}.
+     * This property is settable on {@link jakarta.ws.rs.core.Configurable#property(String, Object)}.
+     *
+     * @see io.helidon.webclient.api.WebClientConfig.Builder#defaultHeadersMap(Map)
+     */
+    public static final String DEFAULT_HEADERS = "jersey.connector.helidon.defaultHeaders";
+
+    /**
+     * Property name to set a protocol ID for each request. You can use this property
+     * to request an HTTP/2 upgrade from HTTP/1.1 by setting its value to {@code "h2"}.
+     * When using TLS, Helidon uses negotiation via the ALPN extension instead of this
+     * property.
+     *
+     * @see io.helidon.webclient.api.HttpClientRequest#protocolId(String)
+     */
+    public static final String PROTOCOL_ID = "jersey.connector.helidon.protocolId";
+
     /**
-     * A Helidon {@link Config} instance that is passed to {@link WebClient.Builder#config(Config)} if available
+     * Property name to enable or disable connection caching in the underlying {@link WebClient}.
+     * The default for the Helidon connector is {@code false}, or no sharing (which is the
+     * opposite of {@link WebClient}). Set this property to {@code true} to enable connection
+     * caching.
+     *
+     * @see io.helidon.webclient.api.WebClientConfig.Builder#shareConnectionCache(boolean)
      */
-    public static final String CONFIG = HelidonProperties.CONFIG;
+    public static final String SHARE_CONNECTION_CACHE = "jersey.connector.helidon.shareConnectionCache";
 }