我有一个由pub/sub主题触发的云函数。现在，当函数被调用时，我想使用rest API将消息数据放入我的服务器。我正在使用"com.loopj.android:android-async-http:1.4.4"依赖项来调用API。我的函数部署成功，但当它触发时，它将显示以下错误。
Failed to execute com.example.Example
java.lang.NoClassDefFoundError: android/os/Handler
at com.example.Example.callapi(Example.java:44)
at com.example.Example.accept(Example.java:25)
at com.example.Example.accept(Example.java:15)
at com.google.cloud.functions.invoker.BackgroundFunctionExecutor$TypedFunctionExecutor.serviceLegacyEvent(BackgroundFunctionExecutor.java:285)
at com.google.cloud.functions.invoker.BackgroundFunctionExecutor.lambda$serviceLegacyEvent$8(BackgroundFunctionExecutor.java:375)
at com.google.cloud.functions.invoker.BackgroundFunctionExecutor.runWithContextClassLoader(BackgroundFunctionExecutor.java:382)
at com.google.cloud.functions.invoker.BackgroundFunctionExecutor.serviceLegacyEvent(BackgroundFunctionExecutor.java:375)
at com.google.cloud.functions.invoker.BackgroundFunctionExecutor.service(BackgroundFunctionExecutor.java:330)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:790)
at org.eclipse.jetty.servlet.ServletHolder.handle(ServletHolder.java:755)
at org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:547)
at org.eclipse.jetty.server.handler.ScopedHandler.nextHandle(ScopedHandler.java:233)
at org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:1297)
at org.eclipse.jetty.server.handler.ScopedHandler.nextScope(ScopedHandler.java:188)
at org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:485)
at org.eclipse.jetty.server.handler.ScopedHandler.nextScope(ScopedHandler.java:186)
at org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:1212)
at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:141)
at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:127)
at com.google.cloud.functions.invoker.runner.Invoker$NotFoundHandler.handle(Invoker.java:392)
at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:127)
at org.eclipse.jetty.server.Server.handle(Server.java:500)
at org.eclipse.jetty.server.HttpChannel.lambda$handle$1(HttpChannel.java:383)
at org.eclipse.jetty.server.HttpChannel.dispatch(HttpChannel.java:547)
at org.eclipse.jetty.server.HttpChannel.handle(HttpChannel.java:375)
at org.eclipse.jetty.server.HttpConnection.onFillable(HttpConnection.java:270)
at org.eclipse.jetty.io.AbstractConnection$ReadCallback.succeeded(AbstractConnection.java:311)
at org.eclipse.jetty.io.FillInterest.fillable(FillInterest.java:103)
at org.eclipse.jetty.io.ChannelEndPoint$2.run(ChannelEndPoint.java:117)
at org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.runTask(EatWhatYouKill.java:336)
at org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.doProduce(EatWhatYouKill.java:313)
at org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.tryProduce(EatWhatYouKill.java:171)
at org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.run(EatWhatYouKill.java:129)
at org.eclipse.jetty.util.thread.ReservedThreadExecutor$ReservedThread.run(ReservedThreadExecutor.java:388)
at org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:806)
at org.eclipse.jetty.util.thread.QueuedThreadPool$Runner.run(QueuedThreadPool.java:938)
at java.base/java.lang.Thread.run(Thread.java:829)
Caused by: java.lang.ClassNotFoundException: android.os.Handler
at java.base/java.net.URLClassLoader.findClass(URLClassLoader.java:471)
at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:589)
at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:522)
... 37 more
云函数java文件--
package com.example;
import com.example.Example.PubSubMessage;
import com.google.cloud.functions.BackgroundFunction;
import com.google.cloud.functions.Context;
import java.util.Base64;
import java.util.Map;
import java.util.logging.Logger;
import com.loopj.android.http.AsyncHttpClient;
import com.loopj.android.http.AsyncHttpResponseHandler;
import com.loopj.android.http.JsonHttpResponseHandler;
import com.loopj.android.http.RequestParams;
public class Example implements BackgroundFunction<PubSubMessage> {
private static final Logger logger = Logger.getLogger(Example.class.getName());
@Override
public void accept(PubSubMessage message, Context context) {
String data = message.data != null
? new String(Base64.getDecoder().decode(message.data))
: "Hello, World";
logger.info(data);
callapi(data);
}
public static class PubSubMessage {
String data;
Map<String, String> attributes;
String messageId;
String publishTime;
}
public void callapi(String data) {
RequestParams rp = new RequestParams();
rp.add("data", data);
AsyncHttpClient client = new AsyncHttpClient();
client.post("http://198.198.198.1/jhd/v1/jhd_controllers/addPurchase", rp, new JsonHttpResponseHandler());
}
}
pom.xml文件--
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>cloudfunctions</groupId>
<artifactId>pubsub-function</artifactId>
<version>1.0-SNAPSHOT</version>
<properties>
<maven.compiler.target>11</maven.compiler.target>
<maven.compiler.source>11</maven.compiler.source>
</properties>
<dependencies>
<dependency>
<groupId>com.loopj.android</groupId>
<artifactId>android-async-http</artifactId>
<version>1.4.4</version>
</dependency>
<!--
<dependency>
<groupId>org.apache.httpcomponents</groupId>
<artifactId>httpclient</artifactId>
<version>4.3.4</version>
</dependency>
-->
<dependency>
<groupId>com.google.cloud.functions</groupId>
<artifactId>functions-framework-api</artifactId>
<version>1.0.1</version>
<type>jar</type>
</dependency>
</dependencies>
<!-- Required for Java 11 functions in the inline editor -->
<build>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<version>3.8.1</version>
<configuration>
<excludes>
<exclude>.google/</exclude>
</excludes>
</configuration>
</plugin>
</plugins>
</build>
</project>
您使用的是Android HTTP客户端。在Java云函数中使用Android库是不可能的。正如您在文档中看到的，整个执行环境都是基于UbuntuImage和Java11的。它不包括Android环境。
即使你查看默认包含的系统包，你也无法找到运行Android库所需的包。
解决方案是使用Java HTTP客户端，就像Java 11中已经构建的客户端一样。您也可以自由选择其他库，因为有许多HTTP客户端同时支持Java和Android。