Servlet给出错误java.lang.NoClassDefFoundError [英] Servlet giving error java.lang.NoClassDefFoundError

问题描述

我在我的应用程序的servlet中使用以下代码

I am using the following code in a servlet of my app

java.awt.Image awtImg = java.awt.Toolkit.getDefaultToolkit （）。createImage（str1）;

当我运行应用程序并调用servlet时，我收到以下错误

When I run the application and call the servlet I get the following error

java.lang.NoClassDefFoundError: Could not initialize class sun.awt.X11.XToolkit
java.lang.Class.forName0(Native Method)
java.lang.Class.forName(Class.java:169)
java.awt.Toolkit$2.run(Toolkit.java:834)
java.security.AccessController.doPrivileged(Native Method)
java.awt.Toolkit.getDefaultToolkit(Toolkit.java:826)
noticeandreports.pdf.appendFiles.PdfFunctionsClass.addSealSpace(PdfFunctionsClass.java:198)
OJ.NoticesandReports.generate_151_OJNotice.execute(generate_151_OJNotice.java:768)
org.apache.struts.action.RequestProcessor.processActionPerform(RequestProcessor.java:425)
org.apache.struts.action.RequestProcessor.process(RequestProcessor.java:228)
org.apache.struts.action.ActionServlet.process(ActionServlet.java:1913)
org.apache.struts.action.ActionServlet.doPost(ActionServlet.java:462)
javax.servlet.http.HttpServlet.service(HttpServlet.java:637)
javax.servlet.http.HttpServlet.service(HttpServlet.java:717)

我已经在Java版本为JDK 1.6.20的Linux机器上托管了该应用程序..

I have hosted the app on a Linux machine with Java version JDK 1.6.20..

可能导致此问题的原因......

What might be causing the issue...

noticeandreports.pdf.appendFiles.PdfFunctionsClass 是编写代码的类， OJ .NoticesandReports.generate_151_OJNotice 是调用上面类中方法的servlet ...

noticeandreports.pdf.appendFiles.PdfFunctionsClass is the class where the code is written and OJ.NoticesandReports.generate_151_OJNotice is the servlet that calls the method inside the above class...

推荐答案

要在服务器端应用程序中使用AWT类，我相信您需要在中运行无头模式。将servlet容器的启动更改为包括：

To use AWT classes in a server side application, I believe you need to run in "headless" mode. Change your servlet container's startup to include:

-Djava.awt.headless=true

（或者如果真的必须在你自己的代码中设置系统属性。）

(Or set the system property within your own code if you really have to.)

您可能还想考虑使用替代映像库 - 第三方映像库或 javax.imageio 包。

You might also want to consider using an alternative imaging library - either a third-party one or the javax.imageio package.

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