我在 JakartaEE maven 專案中嘗試使用 Jsonb / JsonbBuilder 時出錯。
錯誤堆疊跟蹤
java.lang.RuntimeException: jakarta/json/bind/JsonbBuilder
at org.apache.tomcat.websocket.pojo.PojoMessageHandlerBase.handlePojoMethodException(PojoMessageHandlerBase.java:119)
at org.apache.tomcat.websocket.pojo.PojoMessageHandlerWholeBase.onMessage(PojoMessageHandlerWholeBase.java:107)
at org.apache.tomcat.websocket.WsFrameBase.sendMessageText(WsFrameBase.java:415)
at org.apache.tomcat.websocket.server.WsFrameServer.sendMessageText(WsFrameServer.java:129)
at org.apache.tomcat.websocket.WsFrameBase.processDataText(WsFrameBase.java:515)
at org.apache.tomcat.websocket.WsFrameBase.processData(WsFrameBase.java:301)
at org.apache.tomcat.websocket.WsFrameBase.processInputBuffer(WsFrameBase.java:133)
at org.apache.tomcat.websocket.server.WsFrameServer.onDataAvailable(WsFrameServer.java:85)
at org.apache.tomcat.websocket.server.WsFrameServer.doOnDataAvailable(WsFrameServer.java:183)
at org.apache.tomcat.websocket.server.WsFrameServer.notifyDataAvailable(WsFrameServer.java:162)
at org.apache.tomcat.websocket.server.WsHttpUpgradeHandler.upgradeDispatch(WsHttpUpgradeHandler.java:157)
at org.apache.coyote.http11.upgrade.UpgradeProcessorInternal.dispatch(UpgradeProcessorInternal.java:60)
at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:59)
at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:870)
at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1762)
at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49)
at org.apache.tomcat.util.threads.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1191)
at org.apache.tomcat.util.threads.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:659)
at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
at java.base/java.lang.Thread.run(Thread.java:833)
Caused by: java.lang.NoClassDefFoundError: jakarta/json/bind/JsonbBuilder
at com.example.websockets.WebChat.onMessage(WebChat.java:21)
at java.base/jdk.internal.reflect.DirectMethodHandleAccessor.invoke(DirectMethodHandleAccessor.java:104)
at java.base/java.lang.reflect.Method.invoke(Method.java:577)
at org.apache.tomcat.websocket.pojo.PojoMessageHandlerWholeBase.onMessage(PojoMessageHandlerWholeBase.java:105)
... 18 more
Caused by: java.lang.ClassNotFoundException: jakarta.json.bind.JsonbBuilder
at org.apache.catalina.loader.WebappClassLoaderBase.loadClass(WebappClassLoaderBase.java:1449)
at org.apache.catalina.loader.WebappClassLoaderBase.loadClass(WebappClassLoaderBase.java:1257)
... 22 more
聚甲醛
<?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 https://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>com.example</groupId>
<artifactId>websockets</artifactId>
<version>1.0-SNAPSHOT</version>
<name>websockets</name>
<packaging>war</packaging>
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<maven.compiler.target>18</maven.compiler.target>
<maven.compiler.source>18</maven.compiler.source>
</properties>
<dependencies>
<dependency>
<groupId>jakarta.platform</groupId>
<artifactId>jakarta.jakartaee-api</artifactId>
<version>9.1.0</version>
<scope>provided</scope>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-war-plugin</artifactId>
<version>3.3.2</version>
</plugin>
</plugins>
</build>
</project>
拋出錯誤的方法和類匯入
@OnMessage
public void onMessage(Session session, String text) {
try(Jsonb jsonb = JsonbBuilder.create()) {
Message message = jsonb.fromJson(text, Message.class);
System.out.println("Message received: " message);
if(message.getType().equals("join")){
session.getUserProperties().put("name", message.getUserName());
session.getUserProperties().put("active", true);
Message info = new Message(message.getUserName(), "join", message.getUserName() " has joined the chat");
Message updateUserList = new Message(message.getUserName(), "users", getUserNames(session));
sendAll(session , info);
sendAll(session , updateUserList);
} else if(message.getType().equals("chat")){
sendAll(session, message);
}
}catch (Exception e){
throw new RuntimeException(e);
}
}
看起來您的帖子主要是代碼；請添加更多細節。
import jakarta.json.Json;
import jakarta.json.bind.Jsonb;
import jakarta.json.bind.JsonbBuilder;
import jakarta.websocket.OnClose;
import jakarta.websocket.OnError;
import jakarta.websocket.OnMessage;
import jakarta.websocket.Session;
import jakarta.websocket.server.ServerEndpoint;
import java.util.stream.Collectors;
當我嘗試使用 JsonbBuilder 時顯示錯誤并且我在 maven 依賴項中有 jakarta/json/bind/JsonbBuilder。
uj5u.com熱心網友回復：
Tomcat 不包含 Json 系結規范的實作。您可以包含一個實作或切換到完全實作 Jakarta 規范的其他應用程式服務器。
<dependency>
<groupId>org.eclipse</groupId>
<artifactId>yasson</artifactId>
<version>2.0.4</version>
</dependency>
<dependency>
<groupId>org.glassfish</groupId>
<artifactId>jakarta.json</artifactId>
<version>2.0.1</version>
</dependency>
uj5u.com熱心網友回復：
更改為 TomEE 修復了該錯誤。
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