我在用axis2生成java程式碼的時候出現這個錯誤，用下面的方法解決了。大家參考下吧

[quote]I tried all given hints. It still didnt work. I experimented a bit more and here is my solution:

1) Shutdown eclipse

2) Copying the "backport-util-concurrent-3.1.jar" from "$AXIS2_HOME/lib/" to "$ECLIPSE_HOME/plugins/Axis2_Codegen_Wizard_1.3.0/lib/"

3) Adding the following into the "runtime" element "$ECLIPSE_HOME/plugins/Axis2_Codegen_Wizard_1.3.0/plugin.xml" :

<library name="lib/backport-util-concurrent-3.1.jar">
<export name="*"/>
</library>

4) In "$ECLIPSE_HOME/plugins/Axis2_Codegen_Wizard_1.3.0/plugin.xml" changing the version attribute of the "plugin" element from "1.3.0" to "1.4.0". This results still in the same exception. But leave it.

5) Now changing the version also in the plugin's folder name from "Axis2_Codegen_Wizard_1.3.0" to "Axis2_Codegen_Wizard_1.4.0".

6) Start eclipse and try the plugin


In my case it worked then. Hope i could help you. [/quote]

[url]http://topic.csdn.net/u/20080524/01/37d43534-2490-43a4-a24d-bcf62b417de2.html[/url]