未能获得 JDK 11、Spring Boot（包括）的组合。持久性和 JavaFX 工作

Question

我使用的是 JDK 11。我的项目从具有持久性的 Spring Boot 项目开始，我首先将所有数据类连接起来并进行测试。现在我想将 JavaFX 用于 GUI 目的，这意味着开始使用 Java 模块系统。应用程序（如下所示的代码框架）启动到一半，但随后由于以下异常堆栈而中断：

org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'spring.jpa-org.springframework.boot.autoconfigure.orm.jpa.JpaProperties': Lookup method resolution failed

Caused by: java.lang.IllegalStateException: Failed to introspect Class [org.springframework.boot.autoconfigure.orm.jpa.JpaProperties] from ClassLoader [jdk.internal.loader.ClassLoaders$AppClassLoader@6c3708b3]

Caused by: java.lang.NoClassDefFoundError: javax/sql/DataSource

Caused by: java.lang.ClassNotFoundException: javax.sql.DataSource

模块信息当前如下所示：

requires java.persistence;
requires javafx.controls;
requires spring.boot;
requires spring.boot.autoconfigure;
requires spring.context;
requires spring.core;

exports mypackage.app;
opens mypackage.app;

这是主应用程序的（稍微缩小的）Java 源代码：

package mypackage.app;

@SpringBootApplication
public class MyApplication extends Application {

    private static String[] arguments;

    private ConfigurableApplicationContext applicationContext;

    public static void main(String[] args) {
        arguments = args;
        launch(args);
    }

    @Override
    public void init() throws Exception {
        applicationContext = SpringApplication.run(MyApplication.class, arguments);
    }

    @Override
    public void start(Stage stage) throws Exception {
        var label = new Label("xyz");
        var scene = new Scene(new StackPane(label), 640, 480);
        stage.setScene(scene);
        stage.show();
    }

    @Override
    public void stop() {
        applicationContext.stop();
    }

}

编辑。

将 a 添加requires java.sql;到模块信息会导致不同的异常堆栈，在此处复制：

org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'entityManagerFactory' defined in class path resource [org/springframework/boot/autoconfigure/orm/jpa/HibernateJpaConfiguration.class]: Invocation of init method failed

javax.persistence.PersistenceException: Unable to resolve persistence unit root URL

java.io.FileNotFoundException: class path resource [] cannot be resolved to URL because it does not exist

编辑。

如其他地方所示，添加java.xml.bind依赖项解决了持久性单元根 URL 问题，只是用新的异常堆栈替换它：

org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'entityManagerFactory' defined in class path resource [org/springframework/boot/autoconfigure/orm/jpa/HibernateJpaConfiguration.class]: Invocation of init method failed

java.lang.NoClassDefFoundError: net/bytebuddy/matcher/ElementMatchers

java.lang.ClassNotFoundException: net.bytebuddy.matcher.ElementMatchers

Answer 1

以下内容module-info.java解决了该问题：

requires java.persistence;
requires java.sql;
requires java.xml.bind;
requires javafx.controls;
requires net.bytebuddy;
requires spring.boot;
requires spring.boot.autoconfigure;
requires spring.context;
requires spring.core;
requires spring.data.jpa;

exports mypackage.app;
opens mypackage.app;

简而言之，必须添加的依赖项是java.sql、spring.data.jpa、java.xml.bind和net.bytebuddy。而且，应用程序包需要通过最后两行来打开和导出。