NoSuchMethodError - 从同一个包中调用类/方法 [英] NoSuchMethodError - Calling Class/Method from Class in Same Package

问题描述

我们正在将内部框架整合到我们的weblogic应用程序中，我们正在遇到部署问题。

使用技术

• Weblogic 10.3.6应用程序


• Spring 3.0


• Maven 2


• Eclipse J2EE






问题





在启动weblogic应用程序时，我们收到以下NoSuchMethodError初始化其中一个bean。在org.joda.time（2.0）jar中调用类时，会出现此错误。

  Caused By：java.lang。 NoSuchMethodError：org.joda.time.DateTimeZone.convertLocalToUTC（JZ）J 
在org.joda.time.LocalDate.toDateTimeAtStartOfDay（LocalDate.java:715）
在org.joda.time.LocalDate.toDateTimeAtStartOfDay （LocalDate.java:690）
。 。 。排除。 。 
  

我们尝过的事情







• GooglingNoSuchMethodError spring之后，许多问题似乎与Spring版本不兼容。打印依赖关系树后，使用的唯一的Spring版本是3.0。




• GooglingNoSuchMethodError通常给予JAR地狱解决方案。

  
  
  
  
  

  • 相同依赖关系的多个版本。在做一些maven依赖管理后，使用的唯一的joda-time jar是2.0。此外，本地存储库已被清除任何不必要的罐子。

  
  

  • .war / runtime可能没有包含在lib目录中的正确的jar。在查看WEB_INF / lib目录后，唯一的joda-time jar是2.0版，它包含所有适当的类文件。

  
  






一个神秘的事情是DateTimeZone.convertLocalToUTC（JZ）J自1.0以来一直是org.joda.time项目的一部分，所以即使我们有不兼容版本，该方法应该仍然可以找到，特别是如果能够找到类和包。





最后，项目中没有其他的DateTimeZone类（ctrl + shift + e在eclipse中进行搜索）所以我觉得如果没有加载org.joda.DateTimeZone类，那么加载哪个类是很困惑的。





问题：






• 任何人都可以解释为什么该方法无法找到？


• 有更多的地方检查现有的或冲突的罐子吗？


• 有没有办法检查DateTimeZone类LocalDate类在运行时通过Eclipse调试使用？





解决方案

这里有一些有趣的阅读：




prefer-web-inf-classes元素





weblogic.xml Web应用程序部署描述符包含
元素（
元素的子元素）。默认情况下，此元素设置为
False。将此元素设置为True将颠覆类加载器
委托模型，以便Web应用程序
中的类定义优先于较高级别的
类加载器中的类定义。这允许Web应用程序使用自己的
版本的第三方类，这也可能是WebLogic Server的一部分。请参阅
weblogic.xml部署描述符元素。




取自： http://docs.oracle.com/cd/E15051_01/wls/docs103/programming/classloading.html





其他疑难解答提示





您可以尝试：-verbose：类和检查您的受管服务器的日志，以检查是否正确加载该类。





确定哪个侵入式jar可能正在加载的有效方法是运行whereis。 jsp在这个应用程序的相同的webcontext（即JVM实例）中。





- whereis.jsp -

 <％@ page import =java.security。*％> 
<％@ page import =java.net.URL％> 
<％
类cls = org.joda.time.DateTimeZone.class; 
 ProtectionDomain pDomain = cls.getProtectionDomain（）; 
 CodeSource cSource = pDomain.getCodeSource（）; 
 URL loc = cSource.getLocation（）; 
 out.println（loc）; 
 //它应该打印像c：/jars/MyJar.jar
％> 
  

您还可以在$ WEBLOGIC_HOME文件夹上尝试jarscan，看看是否可以找到包含此课程： https://java.net/projects/jarscan/pages/Tutorial




We are integrating an internal framework into our weblogic application and we are running into deployment problems.

Technologies Used

• Weblogic 10.3.6 application
• Spring 3.0
• Maven 2
• Eclipse J2EE

The Problem

On startup of the weblogic application, we receive the following NoSuchMethodError while initializing one of the beans. This error is occuring when calling classes in the org.joda.time (2.0) jar.

Caused By: java.lang.NoSuchMethodError: org.joda.time.DateTimeZone.convertLocalToUTC(JZ)J
      at org.joda.time.LocalDate.toDateTimeAtStartOfDay(LocalDate.java:715)
      at org.joda.time.LocalDate.toDateTimeAtStartOfDay(LocalDate.java:690)
      . . . excluded . . .

Things We Have Tried

• After Googling "NoSuchMethodError spring", many of the problems seem to be incompatible Spring versions. After printing the dependency tree, the only Spring version in use is 3.0.

• Googling "NoSuchMethodError" usually gave JAR hell solutions.

  • Multiple versions of the same dependency. After doing some maven dependency management, the only joda-time jar in use is 2.0. Additionally, the local repository was purged of any unnecessary jars.

  • .war / runtime may not have the correct jars included in the lib directory. After looking into the WEB_INF/lib directory, the only joda-time jar is version 2.0, which contains all of the appropriate class files

One mysterious thing is that the DateTimeZone.convertLocalToUTC(JZ)J has been a part of the org.joda.time project since 1.0, so even if we have incompatible versions, the method should still be found, especially if the class and package are able to be found.

Finally there are no other DateTimeZone classes in the project (ctrl+shift+T search in eclipse) so I'm confused as to which class is being loaded if the org.joda.DateTimeZone class is not being loaded.

Questions:

• Can anyone explain why the method could not be found?
• Are there more places to check for existing or conflicting jars?
• Is there a way to check the DateTimeZone class that the LocalDate class is using during runtime via Eclipse debug?

解决方案

Here's some interesting reading:

prefer-web-inf-classes Element

The weblogic.xml Web application deployment descriptor contains a element (a sub-element of the element). By default, this element is set to False. Setting this element to True subverts the classloader delegation model so that class definitions from the Web application are loaded in preference to class definitions in higher-level classloaders. This allows a Web application to use its own version of a third-party class, which might also be part of WebLogic Server. See "weblogic.xml Deployment Descriptor Elements."

taken from: http://docs.oracle.com/cd/E15051_01/wls/docs103/programming/classloading.html

Other troubleshooting tips:

You can try: -verbose:class and check your managed server's logs to check if the class is being loaded properly.

An efficient way to confirm which intrusive jar might be getting loaded is by running a whereis.jsp within the same webcontext (i.e., JVM instance) of this app.

--whereis.jsp --

<%@ page import="java.security.*" %>
<%@ page import="java.net.URL" %>
<%
Class cls = org.joda.time.DateTimeZone.class;
ProtectionDomain pDomain = cls.getProtectionDomain();
CodeSource cSource = pDomain.getCodeSource();
URL loc = cSource.getLocation();
out.println(loc);
// it should print something like "c:/jars/MyJar.jar"
%>

You can also try jarscan on your $WEBLOGIC_HOME folder to see if you can find the jar that contains this class: https://java.net/projects/jarscan/pages/Tutorial

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