问题描述
尝试在WebLogic 11g上导出时，会抛出NoClassDefFound异常。我检查了应用程序WAR，jasperreports-3.7.4.jar包含在WEB-INF / lib文件夹中。错误是什么？
When trying to export on WebLogic 11g, it throws NoClassDefFound exception. I checked the application WAR and jasperreports-3.7.4.jar is included in WEB-INF/lib folder. What is the error?
StackTrace
推荐答案
最后，我已经开始工作了。我检测到根Exception，它在NoClassDefFoundError之前抛出：net / sf / jasperreports / engine / util / JRStyledTextParser：
Finally, I've got it working. I detected the root Exception, which was thrown before NoClassDefFoundError:net/sf/jasperreports/engine/util/JRStyledTextParser :
java.lang.NoClassDefFoundError: sun/awt/X11GraphicsEnvironment
Unix和Linux上的Sun AWT类依赖于X Window系统。当您使用这些类时，他们希望加载X客户端库并能够与X显示服务器通信。如果您的客户端有GUI，这是有意义的;不幸的是，即使您的客户使用AWT但没有GUI（这是我的情况，从Web应用程序生成报告），它也是必需的。
The Sun AWT classes on Unix and Linux have a dependence on the X Window System. When you use these classes, they expect to load X client libraries and be able to talk to an X display server. This makes sense if your client has a GUI; unfortunately, it's required even if your client uses AWT but does not have a GUI (which is my case, generating a report from a web application)
绕过这个的方法，正在系统启动时设置系统属性 java.awt.headless = true 。
The way to bypass this, is setting a system property java.awt.headless=true on system startup.
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