500 Internal Server Error

java.lang.NoClassDefFoundError
	at java.lang.Class.forName0(Native Method)
	at java.lang.Class.forName(Class.java:141)
	at java.awt.GraphicsEnvironment.getLocalGraphicsEnvironment(GraphicsEnvironment.java:62)
	at java.awt.image.BufferedImage.createGraphics(BufferedImage.java:1041)
	at br.com.brt.portalconvergente.util.captcha.PConvGeradorCaptcha.carregaCaptcha(PConvGeradorCaptcha.java:252)
	at br.com.brt.portalconvergente.util.captcha.PConvGeradorCaptcha.doGet(PConvGeradorCaptcha.java:164)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:740)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
	at com.evermind[Oracle Application Server Containers for J2EE 10g (9.0.4.2.0)].server.http.ServletRequestDispatcher.invoke(ServletRequestDispatcher.java:782)
	at com.evermind[Oracle Application Server Containers for J2EE 10g (9.0.4.2.0)].server.http.ServletRequestDispatcher.forwardInternal(ServletRequestDispatcher.java:330)
	at com.evermind[Oracle Application Server Containers for J2EE 10g (9.0.4.2.0)].server.http.HttpRequestHandler.processRequest(HttpRequestHandler.java:794)
	at com.evermind[Oracle Application Server Containers for J2EE 10g (9.0.4.2.0)].server.http.AJPRequestHandler.run(AJPRequestHandler.java:208)
	at com.evermind[Oracle Application Server Containers for J2EE 10g (9.0.4.2.0)].server.http.AJPRequestHandler.run(AJPRequestHandler.java:125)
	at com.evermind[Oracle Application Server Containers for J2EE 10g (9.0.4.2.0)].util.ReleasableResourcePooledExecutor$MyWorker.run(ReleasableResourcePooledExecutor.java:192)
	at java.lang.Thread.run(Thread.java:534)