带有 GAE 的 Spring Boot (Legacy) - 自动装配

Question

我正在尝试使用 GAE 1.9.19 制作 spring-boot-legacy:1.0.1.RELEASE 和 spring-boot-starter-parent:1.1.8.RELEASE。但是，通过 mvn appengine:devserver 运行时，我收到以下错误，导致应用无法运行：

[INFO] java.lang.NoClassDefFoundError: java.lang.reflect.Parameter is a restricted class. Please see the Google  App Engine developer's guide for more details.
[INFO]  at com.google.appengine.tools.development.agent.runtime.Runtime.reject(Runtime.java:52)
[INFO]  at org.springframework.core.StandardReflectionParameterNameDiscoverer.getParameterNames(StandardReflectionParameterNameDiscoverer.java:53)
[INFO]  at org.springframework.core.PrioritizedParameterNameDiscoverer.getParameterNames(PrioritizedParameterNameDiscoverer.java:65)
[INFO]  at org.springframework.beans.factory.support.ConstructorResolver.autowireConstructor(ConstructorResolver.java:182)
[INFO]  at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.autowireConstructor(AbstractAutowireCapableBeanFactory.java:1115)
[INFO]  at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBeanInstance(AbstractAutowireCapableBeanFactory.java:1018)
[INFO]  at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:504)
[INFO]  at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:475)
[INFO]  at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:302)
[INFO]  at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:228)
[INFO]  at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:298)
[INFO]  at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:193)
[INFO]  at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:706)
[INFO]  at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:762)
[INFO]  at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:482)
[INFO]  at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:691)
[INFO]  at org.springframework.boot.SpringApplication.run(SpringApplication.java:320)

据我了解，Spring 使用反射来自动连接依赖项，但似乎 java.lang.reflect 包中的某些类受到限制。关于如何完成这项工作的任何想法？

Answer 1

java.lang.reflect.Parameter 在 Java 8 下被 Spring 使用。所以你必须降级到 Java 7 以避免它。另一个原因是 Google Appengine 不支持 Java 8，只支持 Java 7。所以无论如何你都需要它。

Answer 2

查看迁移指南 https://cloud.google.com/appengine/docs/standard/java/migrating-to-java8

将<runtime>java8</runtime> 添加到appengine-web.xml