#306: add support for jakarta.servlet-api request objects into JsonRpcServer

Both javax and jakarta objects/APIs have similar method signatures and differ only with types.
Two new classes were added to adapt to the common interface.

Not very last version of jakarta.servlet-api v5.0.0 was added,
because project JDK target is Java 8.
jakarta.servlet-api v5.0.0 comes from the Jakarta EE 9,
which is still compatible with JDK 8.


Signed-off-by: cyb3r4nt <[email protected]>

Author: cyb3r4nt

build.gradle

@@ -96,6 +96,9 @@ dependencies {
 
     servletSupportImplementation 'javax.portlet:portlet-api:3.0.1'
     servletSupportImplementation 'javax.servlet:javax.servlet-api:4.0.1'
+    // TODO: Jakarta EE 9 and jakarta.servlet-api 5.x are still compatible with Java SE 8,
+    // update jakarta.servlet-api to version 6+ when JDK baseline is increased to 11+
+    servletSupportImplementation 'jakarta.servlet:jakarta.servlet-api:5.0.0'
 
     implementation "com.fasterxml.jackson.core:jackson-core:${jacksonVersion}"
     implementation "com.fasterxml.jackson.core:jackson-databind:${jacksonVersion}"

src/main/java/com/googlecode/jsonrpc4j/JsonRpcServer.java

@@ -114,7 +114,27 @@ private static InputStream createInputStream(ResourceRequest request) throws IOE
 	 * @throws IOException on error
 	 */
 	public void handle(HttpServletRequest request, HttpServletResponse response) throws IOException {
-		handleCommon(new JavaxHttpServletRequest(request), new JavaxHttpServletResponse(response));
+		handleCommon(
+			new JavaxHttpServletRequest(request),
+			new JavaxHttpServletResponse(response)
+		);
+	}
+
+	/**
+	 * Handles a servlet request.
+	 *
+	 * @param request  the {@link jakarta.servlet.http.HttpServletRequest}
+	 * @param response the {@link jakarta.servlet.http.HttpServletResponse}
+	 * @throws IOException on error
+	 */
+	public void handle(
+		jakarta.servlet.http.HttpServletRequest request,
+		jakarta.servlet.http.HttpServletResponse response
+	) throws IOException {
+		handleCommon(
+			new JakartaHttpServletRequest(request),
+			new JakartaHttpServletResponse(response)
+		);
 	}
 
 	private void handleCommon(CommonHttpServletRequest request, CommonHttpServletResponse response) throws IOException {
@@ -193,7 +213,36 @@ private JavaxHttpServletRequest(HttpServletRequest request) {
 		}
 
 		@Override
-		public HttpServletRequest unwrap() {
+		public Object unwrap() {
+			return this.request;
+		}
+
+		@Override
+		public InputStream getInputStream() throws IOException {
+			return this.request.getInputStream();
+		}
+
+		@Override
+		public String getMethod() {
+			return this.request.getMethod();
+		}
+
+		@Override
+		public String getParameter(String name) {
+			return this.request.getParameter(name);
+		}
+	}
+
+	private static class JakartaHttpServletRequest implements CommonHttpServletRequest {
+
+		private final jakarta.servlet.http.HttpServletRequest request;
+
+		private JakartaHttpServletRequest(jakarta.servlet.http.HttpServletRequest request) {
+			this.request = request;
+		}
+
+		@Override
+		public Object unwrap() {
 			return this.request;
 		}
 
@@ -248,4 +297,33 @@ public OutputStream getOutputStream() throws IOException {
 			return this.response.getOutputStream();
 		}
 	}
+
+	private static class JakartaHttpServletResponse implements CommonHttpServletResponse {
+
+		private final jakarta.servlet.http.HttpServletResponse response;
+
+		private JakartaHttpServletResponse(jakarta.servlet.http.HttpServletResponse response) {
+			this.response = response;
+		}
+
+		@Override
+		public void setContentType(String type) {
+			this.response.setContentType(type);
+		}
+
+		@Override
+		public void setStatus(int sc) {
+			this.response.setStatus(sc);
+		}
+
+		@Override
+		public void setContentLength(int len) {
+			this.response.setContentLength(len);
+		}
+
+		@Override
+		public OutputStream getOutputStream() throws IOException {
+			return this.response.getOutputStream();
+		}
+	}
 }