在Java应用程序中找到类，但在JSF中找不到类? [英] Class found in a Java application but not in JSF?

问题描述

我正在尝试将bacnet4j与JSF一起使用.

I'm trying to use bacnet4j with JSF.

我在.java中构建了一个应用程序，该应用程序可以打开/关闭灯，但是如果我尝试从JSF页面(与我的管理bean进行通信)调用相同的方法，则会给我:

I build an application in .java which turn on/off a lamp, but if I try to call the same method from a JSF page (which communicates with my manage bean) , gives me :

type Exception report

message

descriptionThe server encountered an internal error () that prevented it from fulfilling this request.

exception

javax.servlet.ServletException: com/serotonin/bacnet4j/type/Encodable
root cause

java.lang.NoClassDefFoundError: com/serotonin/bacnet4j/type/Encodable
root cause

java.lang.ClassNotFoundException: com.serotonin.bacnet4j.type.Encodable

但是我很确定该类在那里，因为如果我的Java应用程序不起作用，对吗?

But I'm pretty sure that the class is there, because if not my java application don't work, right ?

知道为什么会这样吗?

推荐答案

包含此类的JAR文件应放在webapp的/WEB-INF/lib文件夹中.

The JAR file containing this class should go in webapp's /WEB-INF/lib folder.

普通的Java应用程序不使用与Java Web应用程序相同的类路径.对于纯Java应用程序，类路径通常由java命令中的-cp或-classpath参数指定，或者，如果未指定，则由%CLASSPATH%环境变量指定，或者如果是JAR，则由JAR的Class-Path条目指定c6>.对于Java Web应用程序，类路径默认覆盖Webapp的/WEB-INF/lib和/WEB-INF/classes文件夹以及服务器的/lib(及更多)文件夹以及您可以在服务器特定的配置中指定的任何自定义文件夹，例如shared.loader属性如果是Tomcat，则为/conf/catalina.properties.

A plain Java Application does not use the same classpath as a Java Web Application. For a plain Java Application the classpath is usually specified by -cp or -classpath argument in java command, or if unspecified, by %CLASSPATH% environment variable, or if being a JAR, by Class-Path entry in JAR's /META-INF/MANIFEST.MF. For a Java Web Application the classpath covers by default the webapp's /WEB-INF/lib and /WEB-INF/classes folder and server's /lib (and more) folders and any custom folders which you can specify in server-specific configuration, such as shared.loader property of /conf/catalina.properties in case of Tomcat.

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