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     new bdebd92f8d67 CAMEL-24349: camel-google-functions - name the header 
createFunction is missing (#25563)
bdebd92f8d67 is described below

commit bdebd92f8d67d0cb1ce132f4c20f71bd2344ef9f
Author: Andrea Cosentino <[email protected]>
AuthorDate: Fri Aug 21 19:42:54 2026 +0200

    CAMEL-24349: camel-google-functions - name the header createFunction is 
missing (#25563)
    
    createFunction passed the entryPoint, runtime and sourceArchiveUrl headers
    straight into the protobuf setters, which reject null, so a request missing 
any
    of them failed with a bare NullPointerException instead of saying which 
header
    the operation needs.
    
    listFunctions also asked for a page size of Integer.MAX_VALUE while 
iterating
    with iterateAll, which follows the pages by itself; the oversized page size 
is
    dropped.
    
    Signed-off-by: Andrea Cosentino <[email protected]>
    Co-authored-by: Claude Opus 5 (1M context) <[email protected]>
---
 .../camel-google/camel-google-functions/pom.xml    |  5 ++
 .../functions/GoogleCloudFunctionsProducer.java    | 25 ++++++--
 ...CloudFunctionsCreateFunctionValidationTest.java | 74 ++++++++++++++++++++++
 3 files changed, 98 insertions(+), 6 deletions(-)

diff --git a/components/camel-google/camel-google-functions/pom.xml 
b/components/camel-google/camel-google-functions/pom.xml
index 1c6d2df74f14..3e4784449bb5 100644
--- a/components/camel-google/camel-google-functions/pom.xml
+++ b/components/camel-google/camel-google-functions/pom.xml
@@ -89,5 +89,10 @@
             <artifactId>camel-test-junit6</artifactId>
             <scope>test</scope>
         </dependency>
+        <dependency>
+            <groupId>org.assertj</groupId>
+            <artifactId>assertj-core</artifactId>
+            <scope>test</scope>
+        </dependency>
     </dependencies>
 </project>
diff --git 
a/components/camel-google/camel-google-functions/src/main/java/org/apache/camel/component/google/functions/GoogleCloudFunctionsProducer.java
 
b/components/camel-google/camel-google-functions/src/main/java/org/apache/camel/component/google/functions/GoogleCloudFunctionsProducer.java
index 74b3f94f665d..c821e205b326 100644
--- 
a/components/camel-google/camel-google-functions/src/main/java/org/apache/camel/component/google/functions/GoogleCloudFunctionsProducer.java
+++ 
b/components/camel-google/camel-google-functions/src/main/java/org/apache/camel/component/google/functions/GoogleCloudFunctionsProducer.java
@@ -41,6 +41,7 @@ import org.apache.camel.Exchange;
 import org.apache.camel.InvalidPayloadException;
 import org.apache.camel.Message;
 import org.apache.camel.support.DefaultProducer;
+import org.apache.camel.util.ObjectHelper;
 
 /**
  * The GoogleCloudFunctions producer.
@@ -93,10 +94,12 @@ public class GoogleCloudFunctionsProducer extends 
DefaultProducer {
             ListFunctionsPagedResponse pagedListResponse = 
client.listFunctions(request);
             response = Lists.newArrayList(pagedListResponse.iterateAll());
         } else {
+            // no page size: iterateAll below follows the pages itself, and 
the service rejects an
+            // oversized one
             ListFunctionsRequest request = ListFunctionsRequest
                     .newBuilder().setParent(LocationName
                             .of(getConfiguration().getProject(), 
getConfiguration().getLocation()).toString())
-                    .setPageSize(Integer.MAX_VALUE).build();
+                    .build();
             ListFunctionsPagedResponse pagedListResponse = 
client.listFunctions(request);
             response = Lists.newArrayList(pagedListResponse.iterateAll());
         }
@@ -182,11 +185,9 @@ public class GoogleCloudFunctionsProducer extends 
DefaultProducer {
             final String project = getConfiguration().getProject();
             final String location = getConfiguration().getLocation();
             final String functionName = getConfiguration().getFunctionName();
-            final String entryPoint = 
exchange.getIn().getHeader(GoogleCloudFunctionsConstants.ENTRY_POINT,
-                    String.class);
-            final String runtime = 
exchange.getIn().getHeader(GoogleCloudFunctionsConstants.RUNTIME, String.class);
-            final String sourceArchiveUrl = 
exchange.getIn().getHeader(GoogleCloudFunctionsConstants.SOURCE_ARCHIVE_URL,
-                    String.class);
+            final String entryPoint = mandatoryHeader(exchange, 
GoogleCloudFunctionsConstants.ENTRY_POINT);
+            final String runtime = mandatoryHeader(exchange, 
GoogleCloudFunctionsConstants.RUNTIME);
+            final String sourceArchiveUrl = mandatoryHeader(exchange, 
GoogleCloudFunctionsConstants.SOURCE_ARCHIVE_URL);
             CloudFunction function = CloudFunction.newBuilder()
                     .setName(CloudFunctionName.of(project, location, 
functionName).toString()).setEntryPoint(entryPoint)
                     
.setRuntime(runtime).setHttpsTrigger(HttpsTrigger.getDefaultInstance())
@@ -228,6 +229,18 @@ public class GoogleCloudFunctionsProducer extends 
DefaultProducer {
         message.setBody(response);
     }
 
+    /**
+     * A header the request cannot be built without. The protobuf setters 
reject null, so without this the missing
+     * header surfaces as a bare NullPointerException instead of naming what 
is missing.
+     */
+    private static String mandatoryHeader(Exchange exchange, String header) {
+        String value = exchange.getIn().getHeader(header, String.class);
+        if (ObjectHelper.isEmpty(value)) {
+            throw new IllegalArgumentException("The " + header + " header must 
be set for this operation");
+        }
+        return value;
+    }
+
     private GoogleCloudFunctionsOperations determineOperation(Exchange 
exchange) {
         GoogleCloudFunctionsOperations operation = 
exchange.getIn().getHeader(GoogleCloudFunctionsConstants.OPERATION,
                 GoogleCloudFunctionsOperations.class);
diff --git 
a/components/camel-google/camel-google-functions/src/test/java/org/apache/camel/component/google/functions/unit/GoogleCloudFunctionsCreateFunctionValidationTest.java
 
b/components/camel-google/camel-google-functions/src/test/java/org/apache/camel/component/google/functions/unit/GoogleCloudFunctionsCreateFunctionValidationTest.java
new file mode 100644
index 000000000000..910d7ac35335
--- /dev/null
+++ 
b/components/camel-google/camel-google-functions/src/test/java/org/apache/camel/component/google/functions/unit/GoogleCloudFunctionsCreateFunctionValidationTest.java
@@ -0,0 +1,74 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.apache.camel.component.google.functions.unit;
+
+import org.apache.camel.Exchange;
+import org.apache.camel.builder.RouteBuilder;
+import 
org.apache.camel.component.google.functions.GoogleCloudFunctionsConstants;
+import org.junit.jupiter.api.Test;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+/**
+ * Verifies that createFunction reports the header it is missing instead of 
failing inside protobuf.
+ */
+class GoogleCloudFunctionsCreateFunctionValidationTest extends 
GoogleCloudFunctionsBaseTest {
+
+    @Override
+    protected RouteBuilder createRouteBuilder() {
+        return new RouteBuilder() {
+            public void configure() {
+                from("direct:createFunction")
+                        
.to("google-functions://myCamelFunction?project=project123&location=location123"
+                            + "&operation=createFunction");
+            }
+        };
+    }
+
+    @Test
+    void aMissingEntryPointIsReported() {
+        Exchange exchange = template.request("direct:createFunction", e -> {
+        });
+
+        assertThat(exchange.getException())
+                .isInstanceOf(IllegalArgumentException.class)
+                .hasMessage("The " + GoogleCloudFunctionsConstants.ENTRY_POINT 
+ " header must be set for this operation");
+    }
+
+    @Test
+    void aMissingRuntimeIsReported() {
+        Exchange exchange = template.request("direct:createFunction",
+                e -> 
e.getIn().setHeader(GoogleCloudFunctionsConstants.ENTRY_POINT, "myEntryPoint"));
+
+        assertThat(exchange.getException())
+                .isInstanceOf(IllegalArgumentException.class)
+                .hasMessage("The " + GoogleCloudFunctionsConstants.RUNTIME + " 
header must be set for this operation");
+    }
+
+    @Test
+    void aMissingSourceArchiveUrlIsReported() {
+        Exchange exchange = template.request("direct:createFunction", e -> {
+            e.getIn().setHeader(GoogleCloudFunctionsConstants.ENTRY_POINT, 
"myEntryPoint");
+            e.getIn().setHeader(GoogleCloudFunctionsConstants.RUNTIME, 
"java17");
+        });
+
+        assertThat(exchange.getException())
+                .isInstanceOf(IllegalArgumentException.class)
+                .hasMessage("The " + 
GoogleCloudFunctionsConstants.SOURCE_ARCHIVE_URL
+                            + " header must be set for this operation");
+    }
+}

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