JBoss wildfly 8.x Provider" vfs"使用java nio Paths时未安装 [英] JBoss wildfly 8.x Provider "vfs" not installed when using java nio Paths

问题描述

我正在尝试将我的spring应用程序从glassfish 4导出到JBoss wildfly 8.x或9 alpha，但是当我的应用程序在我的代码的某些部分启动时抛出异常：

I'm trying to export my spring application from glassfish 4 to JBoss wildfly 8.x or 9 alpha, but when my application starts in some part of my code throws the exception:

Caused by: java.lang.RuntimeException: java.nio.file.FileSystemNotFoundException: Provider "vfs" not installed
    at io.undertow.servlet.core.DeploymentManagerImpl.deploy(DeploymentManagerImpl.java:218)
    at org.wildfly.extension.undertow.deployment.UndertowDeploymentService.startContext(UndertowDeploymentService.java:87)
    at org.wildfly.extension.undertow.deployment.UndertowDeploymentService.start(UndertowDeploymentService.java:72)
    at org.jboss.msc.service.ServiceControllerImpl$StartTask.startService(ServiceControllerImpl.java:1948) [jboss-msc-1.2.2.Final.jar:1.2.2.Final]
    at org.jboss.msc.service.ServiceControllerImpl$StartTask.run(ServiceControllerImpl.java:1881) [jboss-msc-1.2.2.Final.jar:1.2.2.Final]
    ... 3 more
Caused by: java.nio.file.FileSystemNotFoundException: Provider "vfs" not installed
    at java.nio.file.Paths.get(Paths.java:147) [rt.jar:1.7.0_72]
    at com.springmvcangular.backend.utils.entity.BaseEntityInitializer.extendsEntities(BaseEntityInitializer.java:123)
    at com.springmvcangular.backend.utils.entity.BaseEntityInitializer.initializeBaseEntities(BaseEntityInitializer.java:88)
    at com.springmvcangular.backend.config.ApplicationInitializer.onStartup(ApplicationInitializer.java:60)
    at org.springframework.web.SpringServletContainerInitializer.onStartup(SpringServletContainerInitializer.java:175)
    at io.undertow.servlet.core.DeploymentManagerImpl.deploy(DeploymentManagerImpl.java:178)
    ... 7 more

在我班级 BaseEntityInitializer 在该异常行中我有：

in my class BaseEntityInitializer in that exception line i have:

packagepath = Paths.get(this.getClass().getClassLoader()
                            .getResource(path.replace('.', '/')).toURI());

其中路径它的包路径如 com.something.model ，那么为什么在我的glassfish 4服务器上这完美无缺，我需要在wildfly中使用它？我不知道wildfly中缺少什么，或者我是否需要包含一些库。

where path its a package path like com.something.model, so why in my glassfish 4 server this works perfectly and what i need for use it in wildfly? i don't know what is missing in wildfly or if i need to include some library.

推荐答案

碰巧偶然工作在GlassFish中。无法在 ClassLoader 合同（或JavaEE平台规范）中指定您返回的是哪种 URL 。在GlassFish ClasLoder中，它可能恰好是 jar：// 或 file：// 与之相关的URL成为一个FileSystemProvider（ jar：// 只是偶然BTW）。在WildFly中，这恰好是一个JBoss VFS URL。你现在可以使用各种黑客来使其工作，但它们都无法掩盖你依赖于不可移植的行为这一事实。你最好使用像 URL＃openStream（）这样的东西，而不是便携式，因此应该可以在任何地方使用。

It happens to work by chance in GlassFish. Nowhere in the ClassLoader contract (or JavaEE platform specification) is it specified what kind of URL you get back. In the GlassFish ClasLoder it probably happens to be a jar:// or file:// URL with which there happens to be a FileSystemProvider (jar:// only by accident BTW). In WildFly this happens to be a JBoss VFS URL. There are various hacks that you can apply to make it work for now but they all can't hide the fact that you're relying on not portable behavior. You're better off using something like URL#openStream() instead with is portable and should therefore work everywhere.

更新

您可以尝试做的是在编译时执行更多操作。选项包括：

What you can try to do is doing more at compile time. Options include:

• 在编译时使用Javassist进行转换。这也减少了使用WildFly与Javassist发货冲突的可能性。


• 在编译时收集有关资源的信息并将其存储在一个众所周知的位置的文件中。您可以在多个JAR中拥有相同的文件名，因为 ClassLoader＃getResources（String）可以返回多个结果。

• Do the transformation with Javassist at compile time. This also reduces the chances of conflicts with the Javassist shipping with WildFly.
• Gather the information about the resources at compile time and store it in a file at a well known location. You can have the same file name in multiple JARs as ClassLoader#getResources(String) can return multiple results.

如果您提供有关您尝试解决的问题的更具体的信息，我可以提供更具体的答案。

If you provide more specific informations about the problem you're trying to solve I may be able to give more specific answers.

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