Question

我正在尝试开发一个Grails应用程序来调用一些REST服务......

我正在尝试使用Grails Rest Client Builder插件......

我已经尝试了几个版本的Grails ...目前在最新版本... 2.3.7虽然我也尝试了一些旧版本......

使用IntelliJ 13 ...启动了一个Grails项目......将一个快速的域类组合在一起...使用create-domain-class ...定义了一些字段和约束......然后生成了所有..

使用

在BuildConfig中定义Rest插件

   compile ":rest-client-builder:2.0.0"

也试过2.0.1

我在spring / resources.groovy

中定义了rest bean

// Place your Spring DSL code here
beans = {
     rest(grails.plugins.rest.client.RestBuilder)
}

使用create-service生成一个服务......它非常简单

package myPackage

import grails.transaction.Transactional

@Transactional
class myService {

    def rest

    def serviceMethod() {
        def resp = rest.get("http://myServer/myContextRoot/allEmployees")
        return resp
    }
}

我正在从控制器调用这个服务方法....

    def search() {
        myService.serviceMethod()

        // Not really trying to do anything yet other than see
        // if the bean gets injected properly and the method gets called.
        render("Not yet implemented")
    }

但是，当应用程序尝试启动时，我总是会收到Bean Instantiation Exception。

| Running Grails application
| Error 2014-03-06 16:11:02,310 [localhost-startStop-1] ERROR     context.GrailsContextLoader  - Error initializing the application: Error creating bean with    name 'rest': Instantiation of bean failed; nested exception is   org.springframework.beans.BeanInstantiationException: Could not instantiate bean class    [grails.plugins.rest.client.RestBuilder]: Constructor threw exception; nested exception is   java.lang.UnsupportedOperationException
 Message: Error creating bean with name 'rest': Instantiation of bean failed; nested   exception is org.springframework.beans.BeanInstantiationException: Could not instantiate   bean class [grails.plugins.rest.client.RestBuilder]: Constructor threw exception; nested   exception is java.lang.UnsupportedOperationException
    Line | Method
->> 303 | innerRun in java.util.concurrent.FutureTask$Sync
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 
|   138 | run      in java.util.concurrent.FutureTask
|   895 | runTask  in java.util.concurrent.ThreadPoolExecutor$Worker
|   918 | run      in     ''
^   680 | run . .  in java.lang.Thread
Caused by BeanInstantiationException: Could not instantiate bean class      [grails.plugins.rest.client.RestBuilder]: Constructor threw exception; nested exception is      java.lang.UnsupportedOperationException
->> 303 | innerRun in java.util.concurrent.FutureTask$Sync
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 
|   138 | run      in java.util.concurrent.FutureTask
|   895 | runTask  in java.util.concurrent.ThreadPoolExecutor$Worker
|   918 | run      in     ''
^   680 | run . .  in java.lang.Thread
Caused by UnsupportedOperationException: null
->> 186 | put      in java.util.AbstractMap
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 
|    69 | <init>   in grails.plugins.rest.client.RestBuilder
|    57 | <init> . in     ''
|   303 | innerRun in java.util.concurrent.FutureTask$Sync
|   138 | run . .  in java.util.concurrent.FutureTask
|   895 | runTask  in java.util.concurrent.ThreadPoolExecutor$Worker
|   918 | run . .  in     ''
^   680 | run      in java.lang.Thread

检查Grails源代码似乎对代理初始化所涉及的代码感到窒息，我试图摆弄bean实例化以设置代理设置，但它没有任何影响。

感觉我必须遗漏与插件配置相关的内容，但无法追踪问题。任何建设性的意见都是最受欢迎的。

-Jim

Answer 1

no-arg constructor of RestBuilder通过Collections.emptyMap()创建一个不可变的映射，在某些情况下稍后会尝试put()（例如，如果您通过系统属性定义了HTTP代理）。一种解决方法是使用显式的，可变的rest：

构建您的Map bean

rest(grails.plugins.rest.client.RestBuilder, [:])

我没有检查是否已在JIRA中提交了这个明显的错误。如果没有，那么创建一张票并附上你的示例应用程序可能是值得的。

Grails Rest Client Builder投掷OperationNotSupported

1 个答案: