Provide better stacktrace when throwing web exceptions in Rest Client

extensions/resteasy-reactive/rest-client-reactive/runtime/src/main/java/io/quarkus/rest/client/reactive/runtime/DefaultMicroprofileRestClientExceptionMapper.java

@@ -5,18 +5,29 @@
 import jakarta.ws.rs.core.Response;
 
 import org.eclipse.microprofile.rest.client.ext.ResponseExceptionMapper;
+import org.jboss.resteasy.reactive.client.impl.ClientResponseImpl;
 
 public class DefaultMicroprofileRestClientExceptionMapper implements ResponseExceptionMapper {
 
     public Throwable toThrowable(Response response) {
         try {
             response.bufferEntity();
-        } catch (Exception var3) {
+        } catch (Exception ignored) {
         }
 
-        return new WebApplicationException(
+        WebApplicationException exception = new WebApplicationException(
                 String.format("%s, status code %d", response.getStatusInfo().getReasonPhrase(), response.getStatus()),
                 response);
+
+        if (response instanceof ClientResponseImpl) {
+            ClientResponseImpl clientResponse = (ClientResponseImpl) response;
+            StackTraceElement[] callerStackTrace = clientResponse.getCallerStackTrace();
+            if (callerStackTrace != null) {
+                exception.setStackTrace(callerStackTrace);
+            }
+        }
+
+        return exception;
     }
 
     public boolean handles(int status, MultivaluedMap headers) {

independent-projects/resteasy-reactive/client/runtime/src/main/java/org/jboss/resteasy/reactive/client/handlers/ClientCaptureCurrentContextRestHandler.java

@@ -0,0 +1,49 @@
+package org.jboss.resteasy.reactive.client.handlers;
+
+import java.util.ArrayList;
+import java.util.List;
+
+import org.jboss.resteasy.reactive.client.impl.ClientRequestContextImpl;
+import org.jboss.resteasy.reactive.client.impl.RestClientRequestContext;
+import org.jboss.resteasy.reactive.client.spi.ClientRestHandler;
+
+/**
+ * This handler is meant to be executed first in the handler chain and it captures some useful information like caller
+ * stacktrace.
+ */
+public class ClientCaptureCurrentContextRestHandler implements ClientRestHandler {
+
+    private static final String RESTEASY_REACTIVE_PACKAGE = "org.jboss.resteasy.reactive";
+    private static final String AUTOGENERATED_TAG = "$$";
+
+    @Override
+    public void handle(RestClientRequestContext requestContext) throws Exception {
+        ClientRequestContextImpl clientRequestContext = requestContext.getClientRequestContext();
+        if (clientRequestContext == null) {
+            return;
+        }
+
+        captureCallerStackTrace(clientRequestContext);
+    }
+
+    private void captureCallerStackTrace(ClientRequestContextImpl clientRequestContext) {
+        StackTraceElement[] stackTrace = Thread.currentThread().getStackTrace();
+        List<StackTraceElement> effectiveStackTrace = new ArrayList<>(stackTrace.length);
+        boolean foundUserMethod = false;
+        // skip first trace which is Thread.getStackTrace
+        for (int i = 1; i < stackTrace.length; i++) {
+            StackTraceElement trace = stackTrace[i];
+            if (foundUserMethod) {
+                effectiveStackTrace.add(trace);
+            } else if (!trace.getClassName().startsWith(RESTEASY_REACTIVE_PACKAGE)
+                    && !trace.getClassName().contains(AUTOGENERATED_TAG)) {
+                // Skip the latest traces that starts with the "org.jboss.resteasy.reactive" package,
+                effectiveStackTrace.add(trace);
+                foundUserMethod = true;
+            }
+        }
+
+        clientRequestContext.getRestClientRequestContext()
+                .setCallerStackTrace(effectiveStackTrace.toArray(new StackTraceElement[0]));
+    }
+}

independent-projects/resteasy-reactive/client/runtime/src/main/java/org/jboss/resteasy/reactive/client/impl/ClientResponseImpl.java

@@ -71,4 +71,8 @@ restClientRequestContext.properties, restClientRequestContext, getStringHeaders(
     public String getHttpVersion() {
         return restClientRequestContext.getVertxClientResponse().version().toString();
     }
+
+    public StackTraceElement[] getCallerStackTrace() {
+        return restClientRequestContext.getCallerStackTrace();
+    }
 }

independent-projects/resteasy-reactive/client/runtime/src/main/java/org/jboss/resteasy/reactive/client/impl/HandlerChain.java

@@ -9,6 +9,7 @@
 
 import org.jboss.resteasy.reactive.client.api.ClientLogger;
 import org.jboss.resteasy.reactive.client.api.LoggingScope;
+import org.jboss.resteasy.reactive.client.handlers.ClientCaptureCurrentContextRestHandler;
 import org.jboss.resteasy.reactive.client.handlers.ClientErrorHandler;
 import org.jboss.resteasy.reactive.client.handlers.ClientRequestFilterRestHandler;
 import org.jboss.resteasy.reactive.client.handlers.ClientResponseCompleteRestHandler;
@@ -26,6 +27,7 @@ class HandlerChain {
 
     private static final ClientRestHandler[] EMPTY_REST_HANDLERS = new ClientRestHandler[0];
 
+    private final ClientRestHandler clientCaptureCurrentContextRestHandler;
     private final ClientRestHandler clientSwitchToRequestContextRestHandler;
     private final ClientRestHandler clientSendHandler;
     private final ClientRestHandler clientSetResponseEntityRestHandler;
@@ -36,6 +38,7 @@ class HandlerChain {
 
     public HandlerChain(boolean followRedirects, LoggingScope loggingScope,
             Map<Class<?>, MultipartResponseData> multipartData, ClientLogger clientLogger) {
+        this.clientCaptureCurrentContextRestHandler = new ClientCaptureCurrentContextRestHandler();
         this.clientSwitchToRequestContextRestHandler = new ClientSwitchToRequestContextRestHandler();
         this.clientSendHandler = new ClientSendRequestHandler(followRedirects, loggingScope, clientLogger, multipartData);
         this.clientSetResponseEntityRestHandler = new ClientSetResponseEntityRestHandler();
@@ -52,7 +55,8 @@ ClientRestHandler[] createHandlerChain(ConfigurationImpl configuration) {
         List<ClientRequestFilter> requestFilters = configuration.getRequestFilters();
         List<ClientResponseFilter> responseFilters = configuration.getResponseFilters();
         if (requestFilters.isEmpty() && responseFilters.isEmpty()) {
-            return new ClientRestHandler[] { clientSwitchToRequestContextRestHandler,
+            return new ClientRestHandler[] { clientCaptureCurrentContextRestHandler,
+                    clientSwitchToRequestContextRestHandler,
                     clientSendHandler,
                     clientSetResponseEntityRestHandler,
                     clientResponseCompleteRestHandler };
@@ -65,6 +69,7 @@ ClientRestHandler[] createHandlerChain(ConfigurationImpl configuration) {
         for (int i = 0; i < requestFilters.size(); i++) {
             result.add(new ClientRequestFilterRestHandler(requestFilters.get(i)));
         }
+        result.add(clientCaptureCurrentContextRestHandler);
         result.add(clientSwitchToRequestContextRestHandler);
         result.add(clientSendHandler);
         result.add(clientSetResponseEntityRestHandler);

independent-projects/resteasy-reactive/client/runtime/src/main/java/org/jboss/resteasy/reactive/client/impl/RestClientRequestContext.java

@@ -82,9 +82,6 @@ public class RestClientRequestContext extends AbstractResteasyReactiveContext<Re
     private final ClientRestHandler[] abortHandlerChainWithoutResponseFilters;
 
     private final boolean disableContextualErrorMessages;
-    /**
-     * Only initialised if we have request or response filters
-     */
     /**
      * Only initialised once we get the response
      */
@@ -103,6 +100,7 @@ public class RestClientRequestContext extends AbstractResteasyReactiveContext<Re
     private Response abortedWith;
     private ServiceInstance callStatsCollector;
     private Map<Class<?>, MultipartResponseData> multipartResponsesData;
+    private StackTraceElement[] callerStackTrace;
 
     public RestClientRequestContext(ClientImpl restClient,
             HttpClient httpClient, String httpMethod, URI uri,
@@ -541,6 +539,14 @@ public void setMultipartResponsesData(Map<Class<?>, MultipartResponseData> multi
         this.multipartResponsesData = multipartResponsesData;
     }
 
+    public StackTraceElement[] getCallerStackTrace() {
+        return callerStackTrace;
+    }
+
+    public void setCallerStackTrace(StackTraceElement[] callerStackTrace) {
+        this.callerStackTrace = callerStackTrace;
+    }
+
     @SuppressWarnings("SameParameterValue")
     private Boolean getBooleanProperty(String name, Boolean defaultValue) {
         Object value = configuration.getProperty(name);