使用GAE的Spring Boot（Legacy） - 自動裝配

Question

我正在嘗試使用spring-boot-legacy：1.0.1.RELEASE＆spring-boot-starter-parent：1.1.8.RELEASE with GAE 1.9.19。 但是，在通過mvn appengine：devserver運行時，我收到以下錯誤，阻止應用程序運行：

[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)

根據我的理解，Spring使用反射來自動連接依賴項，但似乎java.lang.reflect包中的某些類是受限制的。 關於如何使這項工作的任何想法？

Answer 1

Spring在Java 8下使用了java.lang.reflect.Parameter 。所以你必須降級到Java 7才能避免它。 另一個原因是Google Appengine不支持Java 8，只支持Java 7.所以無論如何你都需要它。

Answer 2

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

將add <runtime>java8</runtime>到appengine-web.xml