[JENKINS-75556] Fix ClassCastException and ClassNotFoundException in client builder (#78)

Author: strangelookingnerd

src/main/java/com/gitee/jenkins/gitee/api/impl/ResteasyGiteeClientBuilder.java

@@ -16,7 +16,6 @@
 import hudson.ProxyConfiguration;
 import hudson.init.InitMilestone;
 import hudson.init.Initializer;
-import jakarta.ws.rs.client.ClientBuilder;
 import jenkins.model.Jenkins;
 import org.apache.commons.io.IOUtils;
 import org.apache.commons.lang.StringUtils;
@@ -27,8 +26,10 @@
 import org.apache.http.impl.client.DefaultHttpClient;
 import org.jboss.resteasy.client.jaxrs.ClientHttpEngine;
 import org.jboss.resteasy.client.jaxrs.ResteasyClientBuilder.HostnameVerificationPolicy;
+import org.jboss.resteasy.client.jaxrs.ResteasyWebTarget;
 import org.jboss.resteasy.client.jaxrs.engines.ApacheHttpClient43Engine;
 import org.jboss.resteasy.client.jaxrs.internal.ResteasyClientBuilderImpl;
+import org.jboss.resteasy.client.jaxrs.internal.proxy.ProxyBuilderImpl;
 import org.jboss.resteasy.core.providerfactory.ResteasyProviderFactoryImpl;
 import org.jboss.resteasy.plugins.providers.JaxrsFormProvider;
 import org.kohsuke.accmod.Restricted;
@@ -92,7 +93,7 @@ public final GiteeClient buildClient(String url, String apiToken, boolean ignore
     }
 
     private GiteeClient buildClient(String url, String apiToken, ProxyConfiguration httpProxyConfig, boolean ignoreCertificateErrors, int connectionTimeout, int readTimeout) {
-        ResteasyClientBuilder builder = (ResteasyClientBuilder) ClientBuilder.newBuilder();
+        ResteasyClientBuilder builder = new ResteasyClientBuilder();
 
         if (ignoreCertificateErrors) {
             builder.hostnameVerification(HostnameVerificationPolicy.ANY);
@@ -111,7 +112,7 @@ private GiteeClient buildClient(String url, String apiToken, ProxyConfiguration
             }
         }
 
-        GiteeApiProxy apiProxy = builder
+        ResteasyWebTarget target = builder
             .connectionPoolSize(60)
             .maxPooledPerRoute(30)
             .connectTimeout(connectionTimeout, TimeUnit.SECONDS)
@@ -122,8 +123,10 @@ private GiteeClient buildClient(String url, String apiToken, ProxyConfiguration
             .register(new LoggingFilter())
             .register(new RemoveAcceptEncodingFilter())
             .register(new JaxrsFormProvider())
-            .build().target(url)
-            .proxyBuilder(apiProxyClass)
+            .build().target(url);
+
+        // workaround for https://github.com/orgs/resteasy/discussions/4538 when using ResteasyWebTarget#proxyBuilder
+        GiteeApiProxy apiProxy = new ProxyBuilderImpl<>(apiProxyClass, target)
             .classloader(apiProxyClass.getClassLoader())
             .build();