引起:java.lang.NoClassDefFoundError:org/apache/log4j/Logger [英] Caused By: java.lang.NoClassDefFoundError: org/apache/log4j/Logger
问题描述
我遇到了一个有趣的问题，即在运行时找不到 org.apache.log4j.Logger 类.我正在尝试获得授权，但这就是失败的地方:
I've got an interesting problem in which the org.apache.log4j.Logger class is not found during runtime. I'm trying to get authorized and that is where it's failing:
OAuthAuthorizer oauthAuthorizer = new OAuthAuthorizer(OAUTH_CONSUMER_KEY, OAUTH_CONSUMER_SECRET, SAML_PROVIDER_ID, userId);
我使用的是 JDeveloper 11.1.1.6.以下是我所知道的:
I'm using JDeveloper 11.1.1.6. Here is what I know:
我查看了我的 UI.war/WEB-INF/lib 目录，我在那里看到了 log4j-1.2.17.jar.
I've looked in my UI.war/WEB-INF/lib directory and I see the log4j-1.2.17.jar there.
抱怨它的类是 org.opensaml.xml.XMLConfigurator
The class complaining about it is org.opensaml.xml.XMLConfigurator
Caused by: java.lang.NoClassDefFoundError: org/apache/log4j/Logger
at org.opensaml.xml.XMLConfigurator.<clinit>(XMLConfigurator.java:60)
at org.opensaml.DefaultBootstrap.initializeXMLTooling(DefaultBootstrap.java:195)
at org.opensaml.DefaultBootstrap.bootstrap(DefaultBootstrap.java:91)
at com.intuit.ipp.aggcat.util.SAML2AssertionGenerator.getSAMLBuilder(SAML2AssertionGenerator.java:156)
at com.intuit.ipp.aggcat.util.SAML2AssertionGenerator.createSubject(SAML2AssertionGenerator.java:187)
at com.intuit.ipp.aggcat.util.SAML2AssertionGenerator.buildAssertion(SAML2AssertionGenerator.java:114)
at com.intuit.ipp.aggcat.util.SAML2AssertionGenerator.generateSignedAssertion(SAML2AssertionGenerator.java:83)
at com.intuit.ipp.aggcat.util.SamlUtil.createSignedSAMLPayload(SamlUtil.java:156)
at com.intuit.ipp.aggcat.util.OAuthUtil.getOAuthTokens(OAuthUtil.java:60)
at com.intuit.ipp.aggcat.core.OAuthAuthorizer.<init>(OAuthAuthorizer.java:85)
at com.incomemax.view.intuit.WebUtil.getAggCatService(WebUtil.java:91)
Caused by: java.lang.ClassNotFoundException: org.apache.log4j.Logger
at java.net.URLClassLoader$1.run(URLClassLoader.java:202)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:190)
at java.lang.ClassLoader.loadClass(ClassLoader.java:305)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301)
at java.lang.ClassLoader.loadClass(ClassLoader.java:246)
... 64 more
我反编译了 XMLConfigurator，奇怪的是它没有导入 org.apache.log4j.Logger 它使用 org.slf4j.Logger，它也在我的 jars 目录 (slf4j-api-1.7.5.jar) 中.同样有趣的是，第 60 行(参见堆栈跟踪)在我的反编译中是一个空行.
I decomplied XMLConfigurator and oddly it doesn't import org.apache.log4j.Logger It uses org.slf4j.Logger which is also in my jars directory (slf4j-api-1.7.5.jar). Also interesting is that line 60 (see stack trace) is a blank line in my decompile.
当然，如果我在设计时添加 Logger.xxxxx，它会发现它就好了.
Of course if I add Logger.xxxxx during design time, it finds it just fine.
我直接使用示例 Java 代码中的代码/jar，但已导入到我现有的应用程序中.
I'm using the code/jars directly from the sample java code, but imported into my existing application.
我一直在网上搜索答案，我相信我已经检查了我能想到的所有领域.我还引用了这个非常好的页面:http://myarch.com/classnotfound/
I've been scouring the web for answers and I believe I've checked all the areas I can think of. I also referenced this very good page: http://myarch.com/classnotfound/
鉴于授权是使用 Intuit Developer API 的第 1 步，我有点卡住了.
Given authorization is step 1 in using the Intuit Developer API, I'm kinda stuck.
添加来自@jhadesdev 建议的输出:
Adding output from @jhadesdev suggestion:
log4j Logger 的所有版本:
All versions of log4j Logger:
- zip:C:/Users/Chris/AppData/Roaming/JDeveloper/system11.1.1.6.38.61.92/DefaultDomain/servers/DefaultServer/tmp/_WL_user/j2ee-app/lt5l71/war/WEB-INF/lib/log4j-1.2.17.jar!/org/apache/log4j/Logger.class
从 OAuthAuthorizer 类的类加载器中可见的 log4j 的所有版本:
All versions of log4j visible from the classloader of the OAuthAuthorizer class:
- zip:C:/Users/Chris/AppData/Roaming/JDeveloper/system11.1.1.6.38.61.92/DefaultDomain/servers/DefaultServer/tmp/_WL_user/j2ee-app/lt5l71/war/WEB-INF/lib/log4j-1.2.17.jar!/org/apache/log4j/Logger.class
所有版本的 XMLConfigurator:
All versions of XMLConfigurator:
jar:file:/C:/Oracle/Middleware11116/modules/com.bea.core.bea.opensaml2_1.0.0.0_6-1-0-0.jar!/org/opensaml/xml/XMLConfigurator.class
jar:file:/C:/Oracle/Middleware11116/modules/com.bea.core.bea.opensaml2_1.0.0.0_6-1-0-0.jar!/org/opensaml/xml/XMLConfigurator.class
zip:C:/Users/Chris/AppData/Roaming/JDeveloper/system11.1.1.6.38.61.92/DefaultDomain/servers/DefaultServer/tmp/_WL_user/j2ee-app/lt5l71/war/WEB-INF/lib/ipp-java-aggcat-v1-devkit-1.0.2.jar!/org/opensaml/xml/XMLConfigurator.class
zip:C:/Users/Chris/AppData/Roaming/JDeveloper/system11.1.1.6.38.61.92/DefaultDomain/servers/DefaultServer/tmp/_WL_user/j2ee-app/lt5l71/war/WEB-INF/lib/ipp-java-aggcat-v1-devkit-1.0.2.jar!/org/opensaml/xml/XMLConfigurator.class
zip:C:/Users/Chris/AppData/Roaming/JDeveloper/system11.1.1.6.38.61.92/DefaultDomain/servers/DefaultServer/tmp/_WL_user/j2ee-app/lt5l71/war/WEB-INF/lib/xmltooling-1.3.1.jar!/org/opensaml/xml/XMLConfigurator.class
zip:C:/Users/Chris/AppData/Roaming/JDeveloper/system11.1.1.6.38.61.92/DefaultDomain/servers/DefaultServer/tmp/_WL_user/j2ee-app/lt5l71/war/WEB-INF/lib/xmltooling-1.3.1.jar!/org/opensaml/xml/XMLConfigurator.class
从 OAuthAuthorizer 类的类加载器中可以看到 XMLConfigurator 的所有版本:
All versions of XMLConfigurator visible from the class loader of the OAuthAuthorizer class:
jar:file:/C:/Oracle/Middleware11116/modules/com.bea.core.bea.opensaml2_1.0.0.0_6-1-0-0.jar!/org/opensaml/xml/XMLConfigurator.class
jar:file:/C:/Oracle/Middleware11116/modules/com.bea.core.bea.opensaml2_1.0.0.0_6-1-0-0.jar!/org/opensaml/xml/XMLConfigurator.class
zip:C:/Users/Chris/AppData/Roaming/JDeveloper/system11.1.1.6.38.61.92/DefaultDomain/servers/DefaultServer/tmp/_WL_user/j2ee-app/lt5l71/war/WEB-INF/lib/ipp-java-aggcat-v1-devkit-1.0.2.jar!/org/opensaml/xml/XMLConfigurator.class
zip:C:/Users/Chris/AppData/Roaming/JDeveloper/system11.1.1.6.38.61.92/DefaultDomain/servers/DefaultServer/tmp/_WL_user/j2ee-app/lt5l71/war/WEB-INF/lib/ipp-java-aggcat-v1-devkit-1.0.2.jar!/org/opensaml/xml/XMLConfigurator.class
zip:C:/Users/Chris/AppData/Roaming/JDeveloper/system11.1.1.6.38.61.92/DefaultDomain/servers/DefaultServer/tmp/_WL_user/j2ee-app/lt5l71/war/WEB-INF/lib/xmltooling-1.3.1.jar!/org/opensaml/xml/XMLConfigurator.class
zip:C:/Users/Chris/AppData/Roaming/JDeveloper/system11.1.1.6.38.61.92/DefaultDomain/servers/DefaultServer/tmp/_WL_user/j2ee-app/lt5l71/war/WEB-INF/lib/xmltooling-1.3.1.jar!/org/opensaml/xml/XMLConfigurator.class
我仍在努力解释结果.
推荐答案
根据@jhadesdev 的建议和其他人的解释，我在这里找到了问题.
With the suggestions @jhadesdev and the explanations from others, I've found the issue here.
在添加代码以查看各种类加载器可见的内容后，我发现了这一点:
After adding the code to see what was visible to the various class loaders I found this:
All versions of log4j Logger:
zip:<snip>war/WEB-INF/lib/log4j-1.2.17.jar!/org/apache/log4j/Logger.class
All versions of log4j visible from the classloader of the OAuthAuthorizer class:
zip:<snip>war/WEB-INF/lib/log4j-1.2.17.jar!/org/apache/log4j/Logger.class
All versions of XMLConfigurator:
jar:<snip>com.bea.core.bea.opensaml2_1.0.0.0_6-1-0-0.jar!/org/opensaml/xml/XMLConfigurator.class
zip:<snip>war/WEB-INF/lib/ipp-java-aggcat-v1-devkit-1.0.2.jar!/org/opensaml/xml/XMLConfigurator.class
zip:<snip>war/WEB-INF/lib/xmltooling-1.3.1.jar!/org/opensaml/xml/XMLConfigurator.class
All versions of XMLConfigurator visible from the classloader of the OAuthAuthorizer class:
jar:<snip>com.bea.core.bea.opensaml2_1.0.0.0_6-1-0-0.jar!/org/opensaml/xml/XMLConfigurator.class
zip:<snip>war/WEB-INF/lib/ipp-java-aggcat-v1-devkit-1.0.2.jar!/org/opensaml/xml/XMLConfigurator.class
zip:<snip>war/WEB-INF/lib/xmltooling-1.3.1.jar!/org/opensaml/xml/XMLConfigurator.class
我注意到可能会使用另一个版本的 XMLConfigurator.我反编译了那个类并在第 60 行发现了这个(错误在原始堆栈跟踪中) private static final Logger log = Logger.getLogger(XMLConfigurator.class); 并且那个类是从 <代码>org.apache.log4j.Logger!
I noticed that another version of XMLConfigurator was possibly getting picked up.
I decompiled that class and found this at line 60 (where the error was in the original stack trace) private static final Logger log = Logger.getLogger(XMLConfigurator.class); and that class was importing from org.apache.log4j.Logger!
所以就是这个类被加载和使用.我的解决方法是重命名包含此文件的 jar 文件，因为我找不到明确或间接加载它的位置.当我实际部署时，这可能会带来问题.
So it was this class that was being loaded and used. My fix was to rename the jar file that contained this file as I can't find where I explicitly or indirectly load it. Which may pose a problem when I actually deploy.
感谢所有的帮助和关于类加载的急需的课程.
Thanks for all help and the much needed lesson on class loading.
这篇关于引起:java.lang.NoClassDefFoundError:org/apache/log4j/Logger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！
