java.lang.NoClassDefFoundError: org.apache.commons.lang.StringEscapeUtils

今天在网上下载了一个android应用源码，导入Eclipse中，报java.lang.NoClassDefFoundError: org.apache.commons.lang.StringEscapeUtils错，

现在在这里记录一下，以便他日查询：

answers:

This means that the class org.apache.commons.lang.Validate is missing in the runtime classpath. You just have to add the JAR file containing the class to the runtime classpath. It's theApache Commons Lang JAR file. This is also explicitly mentioned at the Jsoup download page.

Assuming that you're launching it using plain vanilla java.exe like as in yourprevious question, then do so:

java -cp .;/path/to/jsoup.jar;/path/to/commons-lang.jar com.example.YourClass

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Note that the Jsoup author has mentioned to remove the Commons Lang dependency in the next Jsoup release.

The next release of jsoup will not require Apache Commons-Lang or any other external dependencies, which brings down the jar size to around 115K

JAR包的下载页面是：http://www.jarfinder.com/index.php/jars/versionInfo/2617