如何使用maven为Spring指定loadTimeWeaver

Question

我有一个奇怪的错误。我有一个基本的 Spring Boot Web 服务器在我的 intelliJIDEA IDE 中运行（在 jetty 上）。

当我运行 Maven 'package' 命令，而不是尝试从命令行运行 Web 服务器时，它会给我一个 loadTimeWeaver 错误。我不明白这两个运行环境之间的区别，在我看来它确实应该有效。

在 IDEA 中，我在运行配置中指定以下内容：
主类：package.Starter
VM 选项：-javaagent:C:/Users/newb/EXT_LIBS/spring-instrument-4.0.3.RELEASE.jar -noverify

在命令行上，我尝试执行以下操作：
java -javaagent:C:/Users/newb/EXT_LIBS/spring-instrument-4.0.3.RELEASE.jar -noverify -jar target\MySpringServer.war

但我收到以下错误：

java.lang.reflect.InvocationTargetException
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
        at java.lang.reflect.Method.invoke(Unknown Source)
        at org.springframework.boot.loader.MainMethodRunner.run(MainMethodRunner.java:53)
        at java.lang.Thread.run(Unknown Source)
Caused by: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'entityManagerFactory' defined in class path resource [applicationContext.xml]: Invocation of init method failed; nested exception is java.lang.IllegalStateException: Cannot apply class transformer without LoadTimeWeaver specified
        at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1553)
        at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:539)
        at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:475)
        at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:304)
        at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:228)
        at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:300)
        at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:195)
        at org.springframework.context.support.AbstractApplicationContext.getBean(AbstractApplicationContext.java:973)
        at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:750)
        at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:482)
        at org.springframework.boot.context.embedded.EmbeddedWebApplicationContext.refresh(EmbeddedWebApplicationContext.java:120)
        at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:648)
        at org.springframework.boot.SpringApplication.run(SpringApplication.java:311)
        at org.springframework.boot.SpringApplication.run(SpringApplication.java:909)
        at org.springframework.boot.SpringApplication.run(SpringApplication.java:898)
        at au.net.iinet.operational.Starter.main(Starter.java:48)
        ... 6 more
Caused by: java.lang.IllegalStateException: Cannot apply class transformer without LoadTimeWeaver specified
        at org.springframework.orm.jpa.persistenceunit.SpringPersistenceUnitInfo.addTransformer(SpringPersistenceUnitInfo.java:80)
        at org.eclipse.persistence.jpa.PersistenceProvider.createContainerEntityManagerFactory(PersistenceProvider.java:348)
        at org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean.createNativeEntityManagerFactory(LocalContainerEntityManagerFactoryBean.java:336)
        at org.springframework.orm.jpa.AbstractEntityManagerFactoryBean.afterPropertiesSet(AbstractEntityManagerFactoryBean.java:318)
        at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.invokeInitMethods(AbstractAutowireCapableBeanFactory.java:1612)
        at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1549)
        ... 21 more

解决 loadTimeWeaver 问题的最佳方法是什么？是否有理由它可以在我的 IDE 中运行，但不能在 IDE 之外运行？我已经陷入了尝试强制设置 loadTimeWeaver 的困境，但这并不是小事，而且它在我的 IDE 中工作的事实意味着我只需要检查一些非常小的事情。

提前致谢。

编辑：
我找到了答案！以下问题对我非常有帮助：我在春季使用加载时编织。如何在码头设置类加载器？
基本上，我还需要在命令行上指定 -Xbootclasspath/a:C:/Users/newb/EXT_LIBS/spring-instrument-4.0.3.RELEASE.jar 。现在它不会给我那些加载时间编织错误！哇！

Answer 1

这应该可以解决你的问题。

@Bean
public InstrumentationLoadTimeWeaver loadTimeWeaver()  throws Throwable {
    InstrumentationLoadTimeWeaver loadTimeWeaver = new InstrumentationLoadTimeWeaver();
    return loadTimeWeaver;
}

在xml配置中也可以做同样的事情。

找到了一个新库，它可以动态设置 spring InstrumentationLoadTimeWeaver 以启用对方面的支持，而无需使用显式 java 代理启动 JVM

<dependency>
    <groupId>de.invesdwin</groupId>
    <artifactId>invesdwin-instrument</artifactId>
    <version>1.0.2</version>
</dependency>

春季启动配置

@SpringBootApplication
/** 
 * Make @Configurable work via @EnableLoadTimeWeaving.
 * If it does not work, alternatively you can try: 
 * @ImportResource(locations = "classpath:/META-INF/ctx.spring.weaving.xml") 
 */
@EnableLoadTimeWeaving
public class MySpringBootApplication {
    public static void main(final String[] args) {
        DynamicInstrumentationLoader.waitForInitialized(); //dynamically attach java agent to jvm if not already present
        DynamicInstrumentationLoader.initLoadTimeWeavingContext(); //weave all classes before they are loaded as beans
        SpringApplication.run(MySpringBootApplication.class, args); //start application, load some classes
    }
}