将 jar 添加到构建路径后出现 NoClassDefFoundError

Question

我正在 Eclipse 中开发一个 android 项目。我正在使用一些已添加到名为 lib 的文件夹中的 3rd 方 jar，并且已将所有 Jars 添加到构建路径中。我正在使用大约 44 个罐子。运行应用程序时出现 NoClassDefFoundError。为什么即使在将它添加到我的 buid 路径后我也会遇到这个问题？我真的很困惑，我将不胜感激！

编辑 我尝试在一个普通的 java 项目中使用相同的类文件，但没有出现任何错误，但它似乎不适用于 android。我需要使用 dx 工具吗？

编辑我已将文件夹的名称更改为 libs，但是当我尝试运行我的应用程序时仍然出现某种错误，这是我在控制台中得到的：

   (org.apache.commons.logging.impl.LogFactoryImpl$1) that doesn't come with an
associated EnclosingMethod attribute. This class was probably produced by a
compiler that did not target the modern .class file format. The recommended
solution is to recompile the class from source, using an up-to-date compiler
and without specifying any "-target" type options. The consequence of ignoring
this warning is that reflective operations on this class will incorrectly
indicate that it is *not* an inner class.
[2012-12-03 19:27:31 - NatureNation] Dx warning: Ignoring InnerClasses attribute for an anonymous inner class
(org.apache.commons.logging.impl.LogFactoryImpl$2) that doesn't come with an
associated EnclosingMethod attribute. This class was probably produced by a
compiler that did not target the modern .class file format. The recommended
solution is to recompile the class from source, using an up-to-date compiler
and without specifying any "-target" type options. The consequence of ignoring
this warning is that reflective operations on this class will incorrectly
indicate that it is *not* an inner class.
[2012-12-03 19:27:31 - NatureNation] Dx warning: Ignoring InnerClasses attribute for an anonymous inner class
(org.apache.commons.logging.impl.LogFactoryImpl$3) that doesn't come with an
associated EnclosingMethod attribute. This class was probably produced by a
compiler that did not target the modern .class file format. The recommended
solution is to recompile the class from source, using an up-to-date compiler
and without specifying any "-target" type options. The consequence of ignoring
this warning is that reflective operations on this class will incorrectly
indicate that it is *not* an inner class.
[2012-12-03 19:27:31 - NatureNation] Dx warning: Ignoring InnerClasses attribute for an anonymous inner class
(org.apache.commons.logging.impl.SimpleLog$1) that doesn't come with an
associated EnclosingMethod attribute. This class was probably produced by a
compiler that did not target the modern .class file format. The recommended
solution is to recompile the class from source, using an up-to-date compiler
and without specifying any "-target" type options. The consequence of ignoring
this warning is that reflective operations on this class will incorrectly
indicate that it is *not* an inner class.
[2012-12-03 19:27:31 - NatureNation] Dx warning: Ignoring InnerClasses attribute for an anonymous inner class
(org.apache.commons.logging.impl.WeakHashtable$1) that doesn't come with an
associated EnclosingMethod attribute. This class was probably produced by a
compiler that did not target the modern .class file format. The recommended
solution is to recompile the class from source, using an up-to-date compiler
and without specifying any "-target" type options. The consequence of ignoring
this warning is that reflective operations on this class will incorrectly
indicate that it is *not* an inner class.
[2012-12-03 19:27:31 - NatureNation] Dx warning: Ignoring InnerClasses attribute for an anonymous inner class
(org.apache.commons.logging.LogFactory$1) that doesn't come with an
associated EnclosingMethod attribute. This class was probably produced by a
compiler that did not target the modern .class file format. The recommended
solution is to recompile the class from source, using an up-to-date compiler
and without specifying any "-target" type options. The consequence of ignoring
this warning is that reflective operations on this class will incorrectly
indicate that it is *not* an inner class.
[2012-12-03 19:27:32 - NatureNation] Dx warning: Ignoring InnerClasses attribute for an anonymous inner class
(org.apache.commons.logging.LogFactory$2) that doesn't come with an
associated EnclosingMethod attribute. This class was probably produced by a
compiler that did not target the modern .class file format. The recommended
solution is to recompile the class from source, using an up-to-date compiler
and without specifying any "-target" type options. The consequence of ignoring
this warning is that reflective operations on this class will incorrectly
indicate that it is *not* an inner class.
[2012-12-03 19:27:32 - NatureNation] Dx warning: Ignoring InnerClasses attribute for an anonymous inner class
(org.apache.commons.logging.LogFactory$3) that doesn't come with an
associated EnclosingMethod attribute. This class was probably produced by a
compiler that did not target the modern .class file format. The recommended
solution is to recompile the class from source, using an up-to-date compiler
and without specifying any "-target" type options. The consequence of ignoring
this warning is that reflective operations on this class will incorrectly
indicate that it is *not* an inner class.
[2012-12-03 19:27:32 - NatureNation] Dx warning: Ignoring InnerClasses attribute for an anonymous inner class
(org.apache.commons.logging.LogFactory$4) that doesn't come with an
associated EnclosingMethod attribute. This class was probably produced by a
compiler that did not target the modern .class file format. The recommended
solution is to recompile the class from source, using an up-to-date compiler
and without specifying any "-target" type options. The consequence of ignoring
this warning is that reflective operations on this class will incorrectly
indicate that it is *not* an inner class.
[2012-12-03 19:27:32 - NatureNation] Dx warning: Ignoring InnerClasses attribute for an anonymous inner class
(org.apache.commons.logging.LogFactory$5) that doesn't come with an
associated EnclosingMethod attribute. This class was probably produced by a
compiler that did not target the modern .class file format. The recommended
solution is to recompile the class from source, using an up-to-date compiler
and without specifying any "-target" type options. The consequence of ignoring
this warning is that reflective operations on this class will incorrectly
indicate that it is *not* an inner class.
[2012-12-03 19:27:32 - NatureNation] Dx warning: Ignoring InnerClasses attribute for an anonymous inner class
(org.apache.commons.logging.LogFactory$6) that doesn't come with an
associated EnclosingMethod attribute. This class was probably produced by a
compiler that did not target the modern .class file format. The recommended
solution is to recompile the class from source, using an up-to-date compiler
and without specifying any "-target" type options. The consequence of ignoring
this warning is that reflective operations on this class will incorrectly
indicate that it is *not* an inner class.
[2012-12-03 19:27:32 - NatureNation] Dx 
trouble processing "javax/xml/XMLConstants.class":

Ill-advised or mistaken usage of a core class (java.* or javax.*)
when not building a core library.

This is often due to inadvertently including a core library file
in your application's project, when using an IDE (such as
Eclipse). If you are sure you're not intentionally defining a
core class, then this is the most likely explanation of what's
going on.

However, you might actually be trying to define a class in a core
namespace, the source of which you may have taken, for example,
from a non-Android virtual machine project. This will most
assuredly not work. At a minimum, it jeopardizes the
compatibility of your app with future versions of the platform.
It is also often of questionable legality.

If you really intend to build a core library -- which is only
appropriate as part of creating a full virtual machine
distribution, as opposed to compiling an application -- then use
the "--core-library" option to suppress this error message.

If you go ahead and use "--core-library" but are in fact
building an application, then be forewarned that your application
will still fail to build or run, at some point. Please be
prepared for angry customers who find, for example, that your
application ceases to function once they upgrade their operating
system. You will be to blame for this problem.

If you are legitimately using some code that happens to be in a
core package, then the easiest safe alternative you have is to
repackage that code. That is, move the classes in question into
your own package namespace. This means that they will never be in
conflict with core system classes. JarJar is a tool that may help
you in this endeavor. If you find that you cannot do this, then
that is an indication that the path you are on will ultimately
lead to pain, suffering, grief, and lamentation.

[2012-12-03 19:27:32 - NatureNation] Dx 1 error; aborting
[2012-12-03 19:27:32 - NatureNation] Conversion to Dalvik format failed with error 1

谢谢

Answer 1

您拥有库的文件夹必须命名为 libs，而不是 lib。请参阅here 了解更多信息。