[BUG][JAVA][JERSEY3] Generated Jersey3 Clients throw java.lang.reflect.InaccessibleObjectException when Calling Endpoint using PATCH

Bug Report Checklist

• Have you provided a full/minimal spec to reproduce the issue?
• Have you validated the input using an OpenAPI validator (example)?
• Have you tested with the latest master to confirm the issue still exists?
• Have you searched for related issues/PRs?
• What's the actual output vs expected output?
• [Optional] Sponsorship to speed up the bug fix or feature request (example)

Description

Calling a Rest Endpoint using PATCH yields an InaccessibleObjectException:

jakarta.ws.rs.ProcessingException: java.lang.reflect.InaccessibleObjectException: Unable to make field protected java.lang.String java.net.HttpURLConnection.method accessible: module java.base does not "opens java.net" to unnamed module @2de8284b
	at org.glassfish.jersey.client.ClientRuntime.invoke(ClientRuntime.java:309)
	at org.glassfish.jersey.client.JerseyInvocation.lambda$invoke$0(JerseyInvocation.java:662)
	at org.glassfish.jersey.client.JerseyInvocation.call(JerseyInvocation.java:697)
	at org.glassfish.jersey.client.JerseyInvocation.lambda$runInScope$3(JerseyInvocation.java:691)
	at org.glassfish.jersey.internal.Errors.process(Errors.java:292)
	at org.glassfish.jersey.internal.Errors.process(Errors.java:274)
	at org.glassfish.jersey.internal.Errors.process(Errors.java:205)
	at org.glassfish.jersey.process.internal.RequestScope.runInScope(RequestScope.java:390)
	at org.glassfish.jersey.client.JerseyInvocation.runInScope(JerseyInvocation.java:691)
	at org.glassfish.jersey.client.JerseyInvocation.invoke(JerseyInvocation.java:661)
	at org.glassfish.jersey.client.JerseyInvocation$Builder.method(JerseyInvocation.java:439)
	at de.db.remote.integrationtests.generated.api.echo.api.invoker.ApiClient.sendRequest(ApiClient.java:1077)
	at de.db.remote.integrationtests.generated.api.echo.api.invoker.ApiClient.invokeAPI(ApiClient.java:1031)
	at de.db.remote.integrationtests.generated.api.echo.api.EchoApi.echoSomethingWithHttpInfo(EchoApi.java:184)
	at de.db.remote.integrationtests.generated.api.echo.api.EchoApi.echoSomething(EchoApi.java:127)
	at de.db.remote.integrationtests.steps.fk.EchoSteps.iSendTheMessageUsingTheCreatedEchoId(EchoSteps.java:44)
	at ?.I Send the message "Hell on earth" using the created echoId(classpath:features/UC-1_Echo_a_Message.feature:20)
Caused by: java.lang.RuntimeException: java.lang.reflect.InaccessibleObjectException: Unable to make field protected java.lang.String java.net.HttpURLConnection.method accessible: module java.base does not "opens java.net" to unnamed module @2de8284b
	at org.glassfish.jersey.client.internal.HttpUrlConnector$3.run(HttpUrlConnector.java:520)
	at java.base/java.security.AccessController.doPrivileged(AccessController.java:569)
	at org.glassfish.jersey.client.internal.HttpUrlConnector.setRequestMethodViaJreBugWorkaround(HttpUrlConnector.java:481)
	at org.glassfish.jersey.client.internal.HttpUrlConnector._apply(HttpUrlConnector.java:325)
	at org.glassfish.jersey.client.internal.HttpUrlConnector.apply(HttpUrlConnector.java:267)
	at org.glassfish.jersey.client.ClientRuntime.invoke(ClientRuntime.java:297)
	at org.glassfish.jersey.client.JerseyInvocation.lambda$invoke$0(JerseyInvocation.java:662)
	at org.glassfish.jersey.client.JerseyInvocation.call(JerseyInvocation.java:697)
	at org.glassfish.jersey.client.JerseyInvocation.lambda$runInScope$3(JerseyInvocation.java:691)
	at org.glassfish.jersey.internal.Errors.process(Errors.java:292)
	at org.glassfish.jersey.internal.Errors.process(Errors.java:274)
	at org.glassfish.jersey.internal.Errors.process(Errors.java:205)
	at org.glassfish.jersey.process.internal.RequestScope.runInScope(RequestScope.java:390)
	at org.glassfish.jersey.client.JerseyInvocation.runInScope(JerseyInvocation.java:691)
	at org.glassfish.jersey.client.JerseyInvocation.invoke(JerseyInvocation.java:661)
	at org.glassfish.jersey.client.JerseyInvocation$Builder.method(JerseyInvocation.java:439)
	at de.db.remote.integrationtests.generated.api.echo.api.invoker.ApiClient.sendRequest(ApiClient.java:1077)
	at de.db.remote.integrationtests.generated.api.echo.api.invoker.ApiClient.invokeAPI(ApiClient.java:1031)
	at de.db.remote.integrationtests.generated.api.echo.api.EchoApi.echoSomethingWithHttpInfo(EchoApi.java:184)
	at de.db.remote.integrationtests.generated.api.echo.api.EchoApi.echoSomething(EchoApi.java:127)
	at de.db.remote.integrationtests.steps.fk.EchoSteps.iSendTheMessageUsingTheCreatedEchoId(EchoSteps.java:44)
	at java.base/jdk.internal.reflect.DirectMethodHandleAccessor.invoke(DirectMethodHandleAccessor.java:104)
	at java.base/java.lang.reflect.Method.invoke(Method.java:577)
	at io.cucumber.java.Invoker.doInvoke(Invoker.java:66)
	[...]
Caused by: java.lang.reflect.InaccessibleObjectException: Unable to make field protected java.lang.String java.net.HttpURLConnection.method accessible: module java.base does not "opens java.net" to unnamed module @2de8284b
	at java.base/java.lang.reflect.AccessibleObject.checkCanSetAccessible(AccessibleObject.java:354)
	at java.base/java.lang.reflect.AccessibleObject.checkCanSetAccessible(AccessibleObject.java:297)
	at java.base/java.lang.reflect.Field.checkCanSetAccessible(Field.java:180)
	at java.base/java.lang.reflect.Field.setAccessible(Field.java:174)
	at org.glassfish.jersey.client.internal.HttpUrlConnector$3.run(HttpUrlConnector.java:515)
	... 107 more

openapi-generator version

Generator Maven Plugin Version: 6.0.1

OpenAPI declaration file content or url

Json Snipped of example PATCH endpoint:

"/echos/{echoId}": {
      "patch": {
        "tags": [
          "echo"
        ],
        "summary": "echo a message",
        "operationId": "echoSomething",
        "parameters": [
          {
            "name": "echoId",
            "in": "path",
            "required": true,
            "schema": {
              "type": "string"
            }
          }
        ],
        "requestBody": {
          "content": {
            "text/plain": {
              "schema": {
                "type": "string"
              }
            }
          },
          "required": true
        },
        "responses": {
          "200": {
            "description": "OK",
            "content": {
              "application/json": {
                "schema": {
                  "$ref": "#/components/schemas/EchoMessage"
                }
              }
            }
          }
        }
      }
    }

Full Swagger Json:
https://gist.github.com/FlorianKaemmerer/e7e973d2c53aa4d96d1422c0b51697d9

Generation Details

Java Version: 17

Relevant Dependencies:

<dependency>
	<groupId>com.fasterxml.jackson.datatype</groupId>
	<artifactId>jackson-datatype-jdk8</artifactId>
	<version>2.13.3</version>
</dependency>
<dependency>
	<groupId>org.glassfish.jersey.core</groupId>
	<artifactId>jersey-client</artifactId>
	<version>3.1.0-M3</version>
</dependency>
<dependency>
	<groupId>org.glassfish.jersey.media</groupId>
	<artifactId>jersey-media-multipart</artifactId>
	<version>3.1.0-M3</version>
</dependency>
<dependency>
	<groupId>org.glassfish.jersey.media</groupId>
	<artifactId>jersey-media-json-jackson</artifactId>
	<version>3.1.0-M3</version>
</dependency>
<dependency>
	<groupId>org.glassfish.jersey.inject</groupId>
	<artifactId>jersey-hk2</artifactId>
	<version>3.1.0-M3</version>
</dependency>
<dependency>
	<groupId>jakarta.annotation</groupId>
	<artifactId>jakarta.annotation-api</artifactId>
	<version>2.1.1</version>
</dependency>

Plugin configuration:

<plugin>
	<groupId>org.openapitools</groupId>
	<artifactId>openapi-generator-maven-plugin</artifactId>
	<version>6.0.1</version>
	<configuration>
		<inputSpec>${project.basedir}/echo.json</inputSpec>
		<generatorName>java</generatorName>
		<generateModelTests>false</generateModelTests>
		<generateApiTests>false</generateApiTests>
		<generateModelTests>false</generateModelTests>
		<generateModelDocumentation>false</generateModelDocumentation>
		<additionalProperties>failOnEmptyBeans=false</additionalProperties>
		<configOptions>
			<library>jersey3</library>
			<hideGenerationTimestamp>true</hideGenerationTimestamp>
			<delegatePattern>true</delegatePattern>
			<java8>true</java8>
			<dateLibrary>java8</dateLibrary>
			<openApiNullable>false</openApiNullable>
			<oas3>true</oas3>
		</configOptions>
	</configuration>
	<executions>
		<execution>
			<id>echo-api</id>
			<goals>
				<goal>generate</goal>
			</goals>
		</execution>
	</executions>
</plugin>

Steps to reproduce

Compile Client
Call "/echos/{echoid}" using PATCH

Related issues/PRs

No relevant Issues found

Suggest a fix

Reproduce the generated Jersey3 client on Java 17 by calling the PATCH endpoint, then inspect ApiClient.sendRequest and the Jersey HttpUrlConnector stack shown in the report. Done means the generated client can invoke PATCH without InaccessibleObjectException, with a regression test covering the reported endpoint and runtime combination.