尝试运行我的项目时抛出BeanCreationException [英] BeanCreationException throwed when trying to run my project

问题描述

我正在尝试使用Spring开发一个RESTful Web服务，然后将其部署到Google App Engine上。该服务的客户端将是一个Android应用程序。我第一次使用spring和GAE，所以对我来说不是很清楚。

I'm trying to develop a RESTful web service using Spring and then deploy it on Google App Engine. The client of the service will be an android application. I'm using spring and GAE for the first time so things are not very clear to me.

我试图关注本教程。当我尝试将我的项目作为Web应用程序项目运行时，我会遇到异常情况： http://pastebin.com/07cVSx2c - 这里是整个输出。

I'm trying to follow this tutorial. When I try to run my project as a Web Application Project I get tones of exceptions: http://pastebin.com/07cVSx2c - here is the whole output.

以下是第一行：

Here are the first lines:

org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerMapping#0': Initialization of bean failed; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'org.springframework.web.servlet.handler.MappedInterceptor#0': Cannot create inner bean '(inner bean)#57459491' of type [org.springframework.web.servlet.handler.ConversionServiceExposingInterceptor] while setting constructor argument; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name '(inner bean)#57459491': Cannot resolve reference to bean 'org.springframework.format.support.FormattingConversionServiceFactoryBean#0' while setting constructor argument; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'org.springframework.format.support.FormattingConversionServiceFactoryBean#0': Invocation of init method failed; nested exception is java.lang.NoClassDefFoundError: java.time.format.FormatStyle is a restricted class. Please see the Google  App Engine developer's guide for more details.
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:547)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:476)
    at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:303)
    at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:230)
    at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:299)
    at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:194)
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:755)
    at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:757)
    at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:480)
    at org.springframework.web.context.ContextLoader.configureAndRefreshWebApplicationContext(ContextLoader.java:403)
    at org.springframework.web.context.ContextLoader.initWebApplicationContext(ContextLoader.java:306)
    at org.springframework.web.context.ContextLoaderListener.contextInitialized(ContextLoaderListener.java:106)
    at org.mortbay.jetty.handler.ContextHandler.startContext(ContextHandler.java:548)
    at org.mortbay.jetty.servlet.Context.startContext(Context.java:136)
    at org.mortbay.jetty.webapp.WebAppContext.startContext(WebAppContext.java:1250)
    at org.mortbay.jetty.handler.ContextHandler.doStart(ContextHandler.java:517)
    at org.mortbay.jetty.webapp.WebAppContext.doStart(WebAppContext.java:467)
    at org.mortbay.component.AbstractLifeCycle.start(AbstractLifeCycle.java:50)
    at org.mortbay.jetty.handler.HandlerWrapper.doStart(HandlerWrapper.java:130)
    at org.mortbay.component.AbstractLifeCycle.start(AbstractLifeCycle.java:50)
    at org.mortbay.jetty.handler.HandlerWrapper.doStart(HandlerWrapper.java:130)
    at org.mortbay.jetty.Server.doStart(Server.java:224)
    at org.mortbay.component.AbstractLifeCycle.start(AbstractLifeCycle.java:50)
    at com.google.appengine.tools.development.JettyContainerService.startContainer(JettyContainerService.java:255)
    at com.google.appengine.tools.development.AbstractContainerService.startup(AbstractContainerService.java:288)
    at com.google.appengine.tools.development.AutomaticInstanceHolder.startUp(AutomaticInstanceHolder.java:26)
    at com.google.appengine.tools.development.AbstractModule.startup(AbstractModule.java:87)
    at com.google.appengine.tools.development.Modules.startup(Modules.java:105)
    at com.google.appengine.tools.development.DevAppServerImpl.doStart(DevAppServerImpl.java:258)
    at com.google.appengine.tools.development.DevAppServerImpl.access$000(DevAppServerImpl.java:47)
    at com.google.appengine.tools.development.DevAppServerImpl$1.run(DevAppServerImpl.java:213)
    at com.google.appengine.tools.development.DevAppServerImpl$1.run(DevAppServerImpl.java:211)
    at java.security.AccessController.doPrivileged(Native Method)
    at com.google.appengine.tools.development.DevAppServerImpl.start(DevAppServerImpl.java:211)
    at com.google.appengine.tools.development.DevAppServerMain$StartAction.apply(DevAppServerMain.java:277)
    at com.google.appengine.tools.util.Parser$ParseResult.applyArgs(Parser.java:48)
    at com.google.appengine.tools.development.DevAppServerMain.run(DevAppServerMain.java:219)
    at com.google.appengine.tools.development.DevAppServerMain.main(DevAppServerMain.java:210)

所以她ei我到目前为止所拥有的：
web.xml

So here i what I have until now: web.xml

<?xml version="1.0" encoding="utf-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns="http://java.sun.com/xml/ns/javaee"
xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"
xsi:schemaLocation="http://java.sun.com/xml/ns/javaee
http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" version="2.5">

    <servlet>
        <servlet-name>mvc-dispatcher</servlet-name>
        <servlet-class>
            org.springframework.web.servlet.DispatcherServlet
        </servlet-class>
        <load-on-startup>1</load-on-startup>
    </servlet>

    <servlet-mapping>
        <servlet-name>mvc-dispatcher</servlet-name>
        <url-pattern>/</url-pattern>
    </servlet-mapping>

    <context-param>
        <param-name>contextConfigLocation</param-name>
        <param-value>/WEB-INF/mvc-dispatcher-servlet.xml</param-value>
    </context-param>

    <listener>
        <listener-class>
                    org.springframework.web.context.ContextLoaderListener
        </listener-class>
    </listener>

    <welcome-file-list>
        <welcome-file>index.html</welcome-file>
    </welcome-file-list>
</web-app>

mvc-dispatcher-servlet.xml $ b

mvc-dispatcher-servlet.xml

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:context="http://www.springframework.org/schema/context"
    xmlns:mvc="http://www.springframework.org/schema/mvc"
    xsi:schemaLocation="
        http://www.springframework.org/schema/beans     
        http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
        http://www.springframework.org/schema/context 
        http://www.springframework.org/schema/context/spring-context-3.0.xsd
        http://www.springframework.org/schema/mvc
        http://www.springframework.org/schema/mvc/spring-mvc-3.0.xsd">

    <context:component-scan
        base-package="com.example.myserver.server">
        <context:exclude-filter type="regex"
            expression="com.example.myserver.Marker.*" />
    </context:component-scan>

    <mvc:annotation-driven />

    <!-- Bean to show you Di in GAE, via Spring, also init the MovieController -->
    <bean
        class="com.example.myserver.MarkerController">
        <property name="markers">
            <value>Hello World</value>
        </property>
    </bean>
</beans>

MarkerController.java

package com.example.myserver;

import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;

@Controller
@RequestMapping("/markers")
public class MarkerController {
    private String markers;

    @RequestMapping(method = RequestMethod.GET)
    public String getMarkers() {
        return this.markers;
    }

    public void setMarkers(String markers) {
        this.markers = markers;
    }

}

你能告诉我什么是问题，我该如何解决它？我试图搜索这个错误 java.lang.NoClassDefFoundError：java.time.format.FormatStyle 但是我没有找到任何东西..在此先感谢！

Can you tell me what is the problem and how can I fix it? I tried to search about this error java.lang.NoClassDefFoundError: java.time.format.FormatStyle but I didn't find anything.. Thanks in advance!

推荐答案

首先，GAE 不完全支持Java 8 。其次，GAE限制Java标准库中哪些类可以使用也可以不使用。允许的课程列在此处。

First, the GAE doesn't fully support Java 8. Second, the GAE restricts which classes from the Java standard library can and cannot be used. The allowed classes are listed here.

通常，类受到限制，因为它们访问GAE中不可用的资源（例如写入文件系统）。然而，我的猜测是FormatStyle仅仅是受限制的，因为它是一个Java 8类，GAE还没有被抓到Java 8中。

Typically classes are restricted because they access resources that are not available in the GAE (e.g. writing to the file system). However, my guess is that FormatStyle is simply restricted because it is a Java 8 class and GAE isn't yet caught up to Java 8.

你得到的NoClassDefFoundError只是尝试访问GAE不允许的类。您的选择是自己重新创建课程，找到已重新创建其他人，或等待GAE最终为其添加支持。

The NoClassDefFoundError that you are getting is simply an attempt to access a class that the GAE does not allow. Your options are to reinvent the class yourself, find someone else that already reinvented it, or wait for GAE to eventually add support for it.

这篇关于尝试运行我的项目时抛出BeanCreationException的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！