blocks|key|2896010|text|你最近有没有更新你的eclipse+android插件(adt+r17)？那么下面的链接可能会有帮助：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2896011|How+to+fix+the+classdefnotfounderror+with+adt-17|offset|length|2896012|更新:这个问题出现已经过去一年了。我会保留这个链接，因为即使在2013年，它似乎也能帮助一些人解决这个问题。但请注意你正在做的事情，请参阅下面的Erics评论。当前的ADT-版本是22，我建议使用最新的版本。|2896013|entityMap|0|LINK|mutability|MUTABLE|url|http://android.foxykeep.com/dev/how-to-fix-the-classdefnotfounderror-with-adt-17^0|0|0|1C|0|0|0^^$0|@$1|2|3|4|5|6|7|P|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|Q|8|@]|9|@$D|R|E|S|1|T]]|A|$]]|$1|F|3|G|5|6|7|U|8|@]|9|@]|A|$]]|$1|H|3|-4|5|6|7|V|8|@]|9|@]|A|$]]]|I|$J|$5|K|L|M|A|$N|O]]]]

Did you recently updated your eclipse android plugin (adt r17)? Then the following link might help:

<a href="http://android.foxykeep.com/dev/how-to-fix-the-classdefnotfounderror-with-adt-17">How to fix the classdefnotfounderror with adt-17</a>

Update: One year has passed since the question arose. I will keep the link, because even in 2013 it seem to help some people to solve the problem. But please take care what you are doing, see Erics comment below. 
Current ADT-Version is 22, I recommend using the most current version.

blocks|key|2896089|text|我通过添加要导出的主项目的私有库修复了这个问题：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2896090|Project+Properties->Java+Build+Path->Order+And+Export|code-block|syntax|javascript|2896091|并确保选中了Android私有库。|2896092|截图：|offset|length|style|BOLD|2896093|​|2896094|📷|atomic|2896095|2896096|确保选中了google-play-services_lib.jar和google-play-services.jar。清理项目并重新运行，classNotfound异常就会消失。|CODE|2896097|entityMap|0|IMAGE|mutability|IMMUTABLE|imageUrl|https://ask.qcloudimg.com/http-save/yehe-900000/170f8ed85063f027626ef7524fcb02c7.jpeg|imageAlt^0|0|0|0|0|3|0|0|0|1|0|0|0|5|S|Y|O|0^^$0|@$1|2|3|4|5|6|7|16|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|17|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|18|8|@]|9|@]|A|$]]|$1|I|3|J|5|6|7|19|8|@$K|1A|L|1B|M|N]]|9|@]|A|$]]|$1|O|3|P|5|6|7|1C|8|@]|9|@]|A|$]]|$1|Q|3|R|5|S|7|1D|8|@]|9|@$K|1E|L|1F|1|1G]]|A|$]]|$1|T|3|P|5|6|7|1H|8|@]|9|@]|A|$]]|$1|U|3|V|5|6|7|1I|8|@$K|1J|L|1K|M|W]|$K|1L|L|1M|M|W]]|9|@]|A|$]]|$1|X|3|-4|5|6|7|1N|8|@]|9|@]|A|$]]]|Y|$Z|$5|10|11|12|A|$13|14|15|-4]]]]

I fixed the issue by just adding private libraries of the main project to export here:

<pre><code>Project Properties-&gt;Java Build Path-&gt;Order And Export
</code></pre>

And make sure Android Private Libraries are checked.

Screenshot:

<img src="https://i.stack.imgur.com/B0HMI.jpg" alt="enter image description here">

Make sure <code>google-play-services_lib.jar</code> and <code>google-play-services.jar</code> are checked. Clean the project and re-run and the classNotfound exception goes away.

blocks|key|230990|text|​|type|unstyled|depth|inlineStyleRanges|entityRanges|data|230991|📷|atomic|offset|length|230992|230993|从项目属性中订购并导出，并确保在导出中包含所需的jars，这为我完成了这项工作|230994|entityMap|0|IMAGE|mutability|IMMUTABLE|imageUrl|https://ask.qcloudimg.com/http-save/yehe-900000/e92ffa2731b6dcb093d3c8dd0f8a14e0.jpeg|imageAlt^0|0|0|1|0|0|0|0^^$0|@$1|2|3|4|5|6|7|S|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|T|8|@]|9|@$E|U|F|V|1|W]]|A|$]]|$1|G|3|4|5|6|7|X|8|@]|9|@]|A|$]]|$1|H|3|I|5|6|7|Y|8|@]|9|@]|A|$]]|$1|J|3|-4|5|6|7|Z|8|@]|9|@]|A|$]]]|K|$L|$5|M|N|O|A|$P|Q|R|-4]]]]

<img src="https://i.imgur.com/TAxjOnGl.png" alt="Imaage">

Go to Order and export from project properties and make sure you're including the required jars in the export, this did it for me

blocks|key|234836|text|按照这个顺序编辑构建路径，这对我很有效。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|234837|确保/gen在/src之前|offset|length|style|CODE|234838|​|234839|📷|atomic|234840|234841|entityMap|0|IMAGE|mutability|IMMUTABLE|imageUrl|https://ask.qcloudimg.com/http-save/yehe-900000/51ebd02732c434cf1ea18c56418d8af0.png|imageAlt^0|0|2|4|7|4|0|0|0|1|0|0|0^^$0|@$1|2|3|4|5|6|7|W|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|X|8|@$D|Y|E|Z|F|G]|$D|10|E|11|F|G]]|9|@]|A|$]]|$1|H|3|I|5|6|7|12|8|@]|9|@]|A|$]]|$1|J|3|K|5|L|7|13|8|@]|9|@$D|14|E|15|1|16]]|A|$]]|$1|M|3|I|5|6|7|17|8|@]|9|@]|A|$]]|$1|N|3|-4|5|6|7|18|8|@]|9|@]|A|$]]]|O|$P|$5|Q|R|S|A|$T|U|V|-4]]]]

Edit the build path in this order, this worked for me.

Make sure the <code>/gen</code> is before <code>/src</code>

<img src="https://i.stack.imgur.com/YTnus.png" alt="enter image description here">

blocks|key|236502|text|在打开包含其他Android库的旧项目时，我曾多次遇到这个问题。对我有效的是：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|236503|将Android移动到Order+and+Export选项卡中的顶部，并取消选择它。|236504|是的，这真的很重要。也许是时候抛弃ADT，转而使用Android+Studio了！|236505|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|H|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|I|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|J|8|@]|9|@]|A|$]]|$1|F|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|G|$]]

I've run into this problem a few times opening old projects that include other Android libraries. What works for me is to:

move Android to the top in the Order and Export tab and deselecting it. 

Yes, this really makes the difference. Maybe it's time for me to ditch ADT for Android Studio!

blocks|key|3110183|text|如果您尝试包含使用jdk+1.7而不是1.6编译的jar，也会出现此错误。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3110184|在我的例子中，我通过尝试用SDK提供的Ant脚本而不是ADT来打包我的应用程序来解决这个问题，我注意到了这些错误，而ADT没有向我显示：|3110185|++[dex]+Pre-Dexing+libjingle_peerconnection.jar+->+libjingle_peerconnection-2f82c9bf868a6c58eaf2c3b2fe6a09f3.jar
+++[dx]
+++[dx]+trouble+processing:
+++[dx]+bad+class+file+magic+(cafebabe)+or+version+(0033.0000)
+++[dx]+...while+parsing+org/webrtc/StatsReport$Value.class
+++[dx]+...while+processing+org/webrtc/StatsReport$Value.class|code-block|syntax|javascript|3110186|我用jdk+1.6重新编译了我的jar，错误被修复了。|3110187|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|N|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|O|8|@]|9|@]|A|$G|H]]|$1|I|3|J|5|6|7|P|8|@]|9|@]|A|$]]|$1|K|3|-4|5|6|7|Q|8|@]|9|@]|A|$]]]|L|$]]

You can also get this error if you try to include a jar which was compiled with jdk 1.7 instead of 1.6. 

In my case, I figured this out by trying to package my app with the Ant scripts provided by the SDK, instead of ADT, and I noticed these errors, which ADT did not show me:

<pre><code> [dex] Pre-Dexing libjingle_peerconnection.jar -&gt; libjingle_peerconnection-2f82c9bf868a6c58eaf2c3b2fe6a09f3.jar
 [dx]
 [dx] trouble processing:
 [dx] bad class file magic (cafebabe) or version (0033.0000)
 [dx] ...while parsing org/webrtc/StatsReport$Value.class
 [dx] ...while processing org/webrtc/StatsReport$Value.class
</code></pre>

I recompiled my jar with jdk 1.6 and the error was fixed.

blocks|key|233934|text|尝试转到Project+->+Properties+->+Java+Build+Path+->+Order+&+Export和，确认您的项目和您在应用程序中使用的所有其他库项目的Android+Private+Libraries都已选中。|type|unstyled|depth|inlineStyleRanges|offset|length|style|BOLD|CODE|entityRanges|data|233935|entityMap^0|4|1M|1R|1F|4|1M|0^^$0|@$1|2|3|4|5|6|7|I|8|@$9|J|A|K|B|C]|$9|L|A|M|B|C]|$9|N|A|O|B|D]]|E|@]|F|$]]|$1|G|3|-4|5|6|7|P|8|@]|E|@]|F|$]]]|H|$]]

Try going to <code>Project -&gt; Properties -&gt; Java Build Path -&gt; Order &amp; Export</code> And Confirm Android Private Libraries are checked for your project and for all other library projects you are using in your Application.

blocks|key|3110204|text|检查Java构建路径后，在清单文件中添加代码行。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3110205|<meta-data
++++++++++++android:name="com.google.android.gms.version"
++++++++++++android:value="@integer/google_play_services_version"+/>|code-block|syntax|javascript|3110206|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

After Checking Java Build Path, Then add lines of code in manifest file.

<pre><code>&lt;meta-data
 android:name="com.google.android.gms.version"
 android:value="@integer/google_play_services_version" /&gt;
</code></pre>

I have an Android project in eclipse IDE which was working. After some imports and tests, I get the error: <code>java.lang.NoClassDefFoundError</code>.

In my project I have two packages: the main one and the second one with some classes.

When I try to instantiate an object from the second package class in the main activity class, I am getting this error.

Here is the logcat:

<pre><code>FATAL EXCEPTION: main
java.lang.NoClassDefFoundError: com.neurospeech.wsclient.MDPIforEditorialBoard
at milos.mdpi.Journals.&lt;init&gt;(Journals.java:41)
at java.lang.Class.newInstanceImpl(Native Method)
at java.lang.Class.newInstance(Class.java:1409)
at android.app.Instrumentation.newActivity(Instrumentation.java:1040)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1777)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1893)
at android.app.ActivityThread.access$1500(ActivityThread.java:135)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1054)
at android.os.Handler.dispatchMessage(Handler.java:99)
at android.os.Looper.loop(Looper.java:150)
at android.app.ActivityThread.main(ActivityThread.java:4389)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:507)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:849)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:607)
at dalvik.system.NativeStart.main(Native Method)
</code></pre>

Found the solution to my problem:

The solution can be found here: <a href="http://android.foxykeep.com/dev/how-to-fix-the-classdefnotfounderror-with-adt-17">http://android.foxykeep.com/dev/how-to-fix-the-classdefnotfounderror-with-adt-17</a>

Android java.lang.NoClassDefFoundError

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我在eclipse IDE中有一个Android项目，它正在工作。在一些导入和测试之后，我得到了错误：java.lang.NoClassDefFoundError。在我的项目中，我有两个包:主包和带有一些类的第二个包。当我试图从主activity类中的第二个package类实例化一个对象时，我得到了这个错误。下面是lo...

问安卓java.lang.NoClassDefFoundError
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